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Date: Tue, 31 Mar 2015 10:49:30 +0200
From: Stefan Agner <stefan@agner.ch>
To: Jianwei Wang <b52261@freescale.com>
Cc: scottwood@freescale.com, airlied@linux.ie, dri-devel@lists.freedesktop.org,
        devicetree@vger.kernel.org, Xiubo Li <lixiubo@cmss.chinamobile.com>,
        Alison Wang <b18965@freescale.com>, linux-kernel@vger.kernel.org,
        Jason.Jin@freescale.com, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v3 1/4] drm/layerscape: Add Freescale DCU DRM driver
In-Reply-To: <1427348225-40731-1-git-send-email-b52261@freescale.com>
References: <1427348225-40731-1-git-send-email-b52261@freescale.com>
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Hi Jianwei,

The driver worked on a Vybrid VF610 device using the exported
framebuffer. However, when using X-Server through the DRM interface
directly (by using the modesetting driver) I get just a black screen so
far, still investigating the reason. What user-space interfaces did you
test?

When using the FB device and insert a USB HID device, I get some
flickers on the screen. I didn't had those on the dcufb driver, did you
notice something like this too? Probably related to the resolution, I'm
using VGA resolution.

Some comments below.


On 2015-03-26 06:37, Jianwei Wang wrote:
> This patch add support for Two Dimensional Animation and Compositing
> Engine (2D-ACE) on the Freescale SoCs.
> 
> 2D-ACE is a Freescale display controller. 2D-ACE describes
> the functionality of the module extremely well its name is a value
> that cannot be used as a token in programming languages.
> Instead the valid token "DCU" is used to tag the register names and
> function names.
> 
> The Display Controller Unit (DCU) module is a system master that
> fetches graphics stored in internal or external memory and displays
> them on a TFT LCD panel. A wide range of panel sizes is supported
> and the timing of the interface signals is highly configurable.
> Graphics are read directly from memory and then blended in real-time,
> which allows for dynamic content creation with minimal CPU
> intervention.
> 
> The features:
> (1) Full RGB888 output to TFT LCD panel.
> (2) For the current LCD panel, WQVGA "480x272" is supported.
> (3) Blending of each pixel using up to 4 source layers
> dependent on size of panel.

modetest only shows one layer currently...

> (4) Each graphic layer can be placed with one pixel resolution
> in either axis.
> (5) Each graphic layer support RGB565 and RGB888 direct colors
> without alpha channel
> and BGRA8888 direct colors with an alpha channel.

The array fsl_dcu_drm_plane_formats below shows more formats, does this
commit log needs updating?

> (6) Each graphic layer support alpha blending with 8-bit
> resolution.
> 
> This is a simplified version, only one primary plane, one
> framebuffer created for fbdev, one crtc, one connector for
> TFT LCD panel, an encoder.
> 
> Signed-off-by: Alison Wang <b18965@freescale.com>
> Signed-off-by: Xiubo Li <lixiubo@cmss.chinamobile.com>
> Signed-off-by: Jianwei Wang <b52261@freescale.com>
> ---
> 
> Changed in V3:
> 
> - Test driver on Vybrid board and add compatible string
> - Remove unused functions
> - set default crtc for encoder
> - replace legacy functions with atomic help functions
> - Set the unique name of the DRM device
> - Implement irq handle function for vblank interrupt
> 
> Changed in v2: 
> - Add atomic support
> - Modify bindings file
> - Rename node for compatibility
> - Move platform related code out for compatibility
> 
>  .../devicetree/bindings/drm/fsl/fsl,dcu.txt        |  50 ++++
>  drivers/gpu/drm/Kconfig                            |   2 +
>  drivers/gpu/drm/Makefile                           |   1 +
>  drivers/gpu/drm/fsl/Kconfig                        |  17 ++
>  drivers/gpu/drm/fsl/Makefile                       |   8 +
>  drivers/gpu/drm/fsl/fsl_dcu_drm_connector.c        | 193 ++++++++++++
>  drivers/gpu/drm/fsl/fsl_dcu_drm_connector.h        |  30 ++
>  drivers/gpu/drm/fsl/fsl_dcu_drm_crtc.c             | 165 ++++++++++
>  drivers/gpu/drm/fsl/fsl_dcu_drm_crtc.h             |  26 ++
>  drivers/gpu/drm/fsl/fsl_dcu_drm_drv.c              | 331 +++++++++++++++++++++
>  drivers/gpu/drm/fsl/fsl_dcu_drm_drv.h              | 210 +++++++++++++
>  drivers/gpu/drm/fsl/fsl_dcu_drm_fbdev.c            |  26 ++
>  drivers/gpu/drm/fsl/fsl_dcu_drm_kms.c              |  42 +++
>  drivers/gpu/drm/fsl/fsl_dcu_drm_kms.h              |  17 ++
>  drivers/gpu/drm/fsl/fsl_dcu_drm_plane.c            | 192 ++++++++++++
>  drivers/gpu/drm/fsl/fsl_dcu_drm_plane.h            |  23 ++
>  16 files changed, 1333 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/drm/fsl/fsl,dcu.txt
>  create mode 100644 drivers/gpu/drm/fsl/Kconfig
>  create mode 100644 drivers/gpu/drm/fsl/Makefile
>  create mode 100644 drivers/gpu/drm/fsl/fsl_dcu_drm_connector.c
>  create mode 100644 drivers/gpu/drm/fsl/fsl_dcu_drm_connector.h
>  create mode 100644 drivers/gpu/drm/fsl/fsl_dcu_drm_crtc.c
>  create mode 100644 drivers/gpu/drm/fsl/fsl_dcu_drm_crtc.h
>  create mode 100644 drivers/gpu/drm/fsl/fsl_dcu_drm_drv.c
>  create mode 100644 drivers/gpu/drm/fsl/fsl_dcu_drm_drv.h
>  create mode 100644 drivers/gpu/drm/fsl/fsl_dcu_drm_fbdev.c
>  create mode 100644 drivers/gpu/drm/fsl/fsl_dcu_drm_kms.c
>  create mode 100644 drivers/gpu/drm/fsl/fsl_dcu_drm_kms.h
>  create mode 100644 drivers/gpu/drm/fsl/fsl_dcu_drm_plane.c
>  create mode 100644 drivers/gpu/drm/fsl/fsl_dcu_drm_plane.h
> 
> diff --git a/Documentation/devicetree/bindings/drm/fsl/fsl,dcu.txt
> b/Documentation/devicetree/bindings/drm/fsl/fsl,dcu.txt
> new file mode 100644
> index 0000000..bdc7d5b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/drm/fsl/fsl,dcu.txt
> @@ -0,0 +1,50 @@
> +Device Tree bindings for Freescale DCU DRM Driver
> +
> +Required properties:
> +- compatible:           Should be one of
> +	* "fsl,ls1021a-dcu".
> +	* "fsl,vf610-dcu".

In the Vybrid reference manual, that IP is denoted as "DCU4". Any reason
why you left out the DCU version? Is this different for LS1021a? On the
other hand, with the SoC in the name, the IP should be specified clear
enough.

> +- reg:                  Address and length of the register set for dcu.
> +- clocks:               From common clock binding: handle to dcu clock.
> +- clock-names:          From common clock binding: Shall be "dcu".
> +- display:              The phandle to display node.
> +
> +Required properties:
> +- bits-per-pixel:       <16> for RGB565,
> +			<24> for RGB888,
> +			<32> for RGB8888.
> +
> +Required timing node for dispplay sub-node:
> +- display-timings:      Refer to binding doc display-timing.txt for details.
> +
> +Examples:
> +dcu: dcu@2ce0000 {
> +	compatible = "fsl,ls1021a-dcu";
> +	reg = <0x0 0x2ce0000 0x0 0x10000>;
> +	clocks = <&platform_clk 0>;
> +	clock-names = "dcu";
> +	big-endian;
> +	display = <&display>;
> +
> +	display: display@0 {
> +		bits-per-pixel = <24>;
> +
> +		display-timings {
> +			native-mode = <&timing0>;
> +			timing0: nl4827hc19 {
> +				clock-frequency = <10870000>;
> +				hactive = <480>;
> +				vactive = <272>;
> +				hback-porch = <2>;
> +				hfront-porch = <2>;
> +				vback-porch = <1>;
> +				vfront-porch = <1>;
> +				hsync-len = <41>;
> +				vsync-len = <2>;
> +				hsync-active = <1>;
> +				vsync-active = <1>;
> +			};
> +		};
> +	};
> +};
> +
> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> index 151a050..a6957aa 100644
> --- a/drivers/gpu/drm/Kconfig
> +++ b/drivers/gpu/drm/Kconfig
> @@ -199,6 +199,8 @@ source "drivers/gpu/drm/bochs/Kconfig"
>  
>  source "drivers/gpu/drm/msm/Kconfig"
>  
> +source "drivers/gpu/drm/fsl/Kconfig"
> +
>  source "drivers/gpu/drm/tegra/Kconfig"
>  
>  source "drivers/gpu/drm/panel/Kconfig"
> diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> index 2c239b9..ab5b9ef 100644
> --- a/drivers/gpu/drm/Makefile
> +++ b/drivers/gpu/drm/Makefile
> @@ -56,6 +56,7 @@ obj-$(CONFIG_DRM_UDL) += udl/
>  obj-$(CONFIG_DRM_AST) += ast/
>  obj-$(CONFIG_DRM_ARMADA) += armada/
>  obj-$(CONFIG_DRM_ATMEL_HLCDC)	+= atmel-hlcdc/
> +obj-$(CONFIG_DRM_FSL_DCU) += fsl/

Hm, I'm wondering whether it would be a good idea to store that driver
under fsl-dcu/... Any opinion?

>  obj-$(CONFIG_DRM_RCAR_DU) += rcar-du/
>  obj-$(CONFIG_DRM_SHMOBILE) +=shmobile/
>  obj-$(CONFIG_DRM_OMAP)	+= omapdrm/
> diff --git a/drivers/gpu/drm/fsl/Kconfig b/drivers/gpu/drm/fsl/Kconfig
> new file mode 100644
> index 0000000..e4f8df0
> --- /dev/null
> +++ b/drivers/gpu/drm/fsl/Kconfig
> @@ -0,0 +1,17 @@
> +config DRM_FSL_DCU
> +	tristate "DRM Support for Freescale DCU"
> +	depends on DRM && OF && ARM
> +	select DRM_KMS_HELPER
> +	select DRM_KMS_CMA_HELPER
> +	select VIDEOMODE_HELPERS
> +	select BACKLIGHT_CLASS_DEVICE
> +	select BACKLIGHT_LCD_SUPPORT
> +	select REGMAP_MMIO
> +	select DRM_KMS_FB_HELPER
> +	select FB_SYS_FILLRECT
> +	select FB_SYS_COPYAREA
> +	select FB_SYS_IMAGEBLIT
> +	select FB_SYS_FOPS
> +	help
> +	  Choose this option if you have an Freescale DCU chipset.
> +	  If M is selected the module will be called fsl-dcu-drm.
> diff --git a/drivers/gpu/drm/fsl/Makefile b/drivers/gpu/drm/fsl/Makefile
> new file mode 100644
> index 0000000..5f74aee
> --- /dev/null
> +++ b/drivers/gpu/drm/fsl/Makefile
> @@ -0,0 +1,8 @@
> +fsl-dcu-drm-y := fsl_dcu_drm_drv.o \
> +	       fsl_dcu_drm_kms.o \
> +	       fsl_dcu_drm_connector.o \
> +	       fsl_dcu_drm_plane.o \
> +	       fsl_dcu_drm_crtc.o \
> +	       fsl_dcu_drm_fbdev.o \
> +
> +obj-$(CONFIG_DRM_FSL_DCU)	+= fsl-dcu-drm.o
> diff --git a/drivers/gpu/drm/fsl/fsl_dcu_drm_connector.c
> b/drivers/gpu/drm/fsl/fsl_dcu_drm_connector.c
> new file mode 100644
> index 0000000..4610647
> --- /dev/null
> +++ b/drivers/gpu/drm/fsl/fsl_dcu_drm_connector.c
> @@ -0,0 +1,193 @@
> +/*
> + * Copyright 2015 Freescale Semiconductor, Inc.
> + *
> + * Freescale DCU drm device driver
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + */
> +
> +#include <linux/backlight.h>
> +
> +#include <drm/drmP.h>
> +#include <drm/drm_atomic_helper.h>
> +#include <video/of_display_timing.h>
> +
> +#include "fsl_dcu_drm_drv.h"
> +#include "fsl_dcu_drm_connector.h"
> +
> +static void fsl_dcu_drm_encoder_dpms(struct drm_encoder *encoder, int mode)
> +{
> +}
> +
> +static void fsl_dcu_drm_encoder_mode_prepare(struct drm_encoder *encoder)
> +{
> +}
> +
> +static void fsl_dcu_drm_encoder_mode_set(struct drm_encoder *encoder,
> +					 struct drm_display_mode *mode,
> +					 struct drm_display_mode *adjusted_mode)
> +{
> +}
> +
> +static void fsl_dcu_drm_encoder_mode_commit(struct drm_encoder *encoder)
> +{
> +}
> +
> +static void fsl_dcu_drm_encoder_disable(struct drm_encoder *encoder)
> +{
> +}
> +
> +static int
> +fsl_dcu_drm_encoder_atomic_check(struct drm_encoder *encoder,
> +				 struct drm_crtc_state *crtc_state,
> +				 struct drm_connector_state *conn_state)
> +{
> +	return 0;
> +}
> +
> +static void fsl_dcu_drm_encoder_destroy(struct drm_encoder *encoder)
> +{
> +	drm_encoder_cleanup(encoder);
> +}
> +
> +static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
> +	.dpms = fsl_dcu_drm_encoder_dpms,
> +	.prepare = fsl_dcu_drm_encoder_mode_prepare,
> +	.commit = fsl_dcu_drm_encoder_mode_commit,
> +	.mode_set = fsl_dcu_drm_encoder_mode_set,
> +	.disable = fsl_dcu_drm_encoder_disable,
> +	.atomic_check = fsl_dcu_drm_encoder_atomic_check,
> +};
> +
> +static const struct drm_encoder_funcs encoder_funcs = {
> +	.destroy = fsl_dcu_drm_encoder_destroy,
> +};
> +
> +int fsl_dcu_drm_encoder_create(struct fsl_dcu_drm_device *fsl_dev,
> +			       struct fsl_dcu_drm_crtc *crtc)
> +{
> +	struct drm_encoder *encoder = &fsl_dev->encoder;
> +	int ret;
> +
> +	ret = drm_encoder_init(fsl_dev->ddev, encoder, &encoder_funcs,
> +			       DRM_MODE_ENCODER_LVDS);
> +	if (ret < 0)
> +		return ret;
> +
> +	drm_encoder_helper_add(encoder, &encoder_helper_funcs);
> +	encoder->crtc = &crtc->crtc;
> +
> +	return 0;
> +}
> +
> +#define to_fsl_dcu_connector(connector) \
> +	container_of(connector, struct fsl_dcu_drm_connector, connector)
> +
> +static int fsl_dcu_drm_connector_get_modes(struct drm_connector *connector)
> +{
> +	struct drm_device *dev = connector->dev;
> +	struct device_node *display_np, *np = dev->dev->of_node;
> +	struct drm_display_mode *mode = drm_mode_create(connector->dev);
> +	int num_modes = 0;
> +
> +	if (np) {
> +		display_np = of_parse_phandle(np, "display", 0);
> +		if (!display_np) {
> +			dev_err(dev->dev, "failed to find display phandle\n");
> +			return num_modes;
> +		}
> +		of_get_drm_display_mode(display_np, mode, OF_USE_NATIVE_MODE);
> +		mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
> +		drm_mode_probed_add(connector, mode);
> +		num_modes++;
> +	}
> +
> +	return num_modes;
> +}
> +
> +static int fsl_dcu_drm_connector_mode_valid(struct drm_connector *connector,
> +					    struct drm_display_mode *mode)
> +{
> +	return MODE_OK;
> +}
> +
> +static struct drm_encoder *
> +fsl_dcu_drm_connector_best_encoder(struct drm_connector *connector)
> +{
> +	struct fsl_dcu_drm_connector *fsl_con = to_fsl_dcu_connector(connector);
> +
> +	return fsl_con->encoder;
> +}
> +
> +static void fsl_dcu_drm_connector_destroy(struct drm_connector *connector)
> +{
> +	drm_connector_unregister(connector);
> +	drm_connector_cleanup(connector);
> +}
> +
> +static enum drm_connector_status
> +fsl_dcu_drm_connector_detect(struct drm_connector *connector, bool force)
> +{
> +	return connector_status_connected;
> +}
> +
> +static const struct drm_connector_funcs fsl_dcu_drm_connector_funcs = {
> +	.dpms = drm_atomic_helper_connector_dpms,
> +	.reset = drm_atomic_helper_connector_reset,
> +	.detect = fsl_dcu_drm_connector_detect,
> +	.fill_modes = drm_helper_probe_single_connector_modes,
> +	.destroy = fsl_dcu_drm_connector_destroy,
> +	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> +	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> +};
> +
> +static const struct drm_connector_helper_funcs connector_helper_funcs = {
> +	.get_modes = fsl_dcu_drm_connector_get_modes,
> +	.mode_valid = fsl_dcu_drm_connector_mode_valid,
> +	.best_encoder = fsl_dcu_drm_connector_best_encoder,
> +};
> +
> +int fsl_dcu_drm_connector_create(struct fsl_dcu_drm_device *fsl_dev,
> +				 struct drm_encoder *encoder)
> +{
> +	struct drm_connector *connector = &fsl_dev->connector.connector;
> +	int ret;
> +
> +	fsl_dev->connector.encoder = encoder;
> +
> +	connector->display_info.width_mm = 0;
> +	connector->display_info.height_mm = 0;
> +
> +	ret = drm_connector_init(fsl_dev->ddev, connector,
> +				 &fsl_dcu_drm_connector_funcs,
> +				 DRM_MODE_CONNECTOR_LVDS);
> +	if (ret < 0)
> +		return ret;
> +
> +	connector->dpms = DRM_MODE_DPMS_OFF;
> +	drm_connector_helper_add(connector, &connector_helper_funcs);
> +	ret = drm_connector_register(connector);
> +	if (ret < 0)
> +		goto err_cleanup;
> +
> +	ret = drm_mode_connector_attach_encoder(connector, encoder);
> +	if (ret < 0)
> +		goto err_sysfs;
> +
> +	connector->encoder = encoder;
> +
> +	drm_object_property_set_value
> +		(&connector->base, fsl_dev->ddev->mode_config.dpms_property,
> +		DRM_MODE_DPMS_OFF);
> +
> +	return 0;
> +
> +err_sysfs:
> +	drm_connector_unregister(connector);
> +err_cleanup:
> +	drm_connector_cleanup(connector);
> +	return ret;
> +}
> diff --git a/drivers/gpu/drm/fsl/fsl_dcu_drm_connector.h
> b/drivers/gpu/drm/fsl/fsl_dcu_drm_connector.h
> new file mode 100644
> index 0000000..bbf6d38
> --- /dev/null
> +++ b/drivers/gpu/drm/fsl/fsl_dcu_drm_connector.h
> @@ -0,0 +1,30 @@
> +/*
> + * Copyright 2015 Freescale Semiconductor, Inc.
> + *
> + * Freescale DCU drm device driver
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + */
> +
> +#ifndef __FSL_DCU_DRM_CONNECTOR_H__
> +#define __FSL_DCU_DRM_CONNECTOR_H__
> +
> +#include <drm/drmP.h>
> +#include <drm/drm_crtc.h>
> +#include "fsl_dcu_drm_crtc.h"
> +
> +struct fsl_dcu_drm_device;
> +struct fsl_dcu_drm_connector {
> +	struct drm_connector connector;
> +	struct drm_encoder *encoder;
> +};
> +
> +int fsl_dcu_drm_encoder_create(struct fsl_dcu_drm_device *fsl_dev,
> +			       struct fsl_dcu_drm_crtc *crtc);
> +int fsl_dcu_drm_connector_create(struct fsl_dcu_drm_device *fsl_dev,
> +				 struct drm_encoder *encoder);
> +
> +#endif /* __FSL_DCU_DRM_CONNECTOR_H__ */
> diff --git a/drivers/gpu/drm/fsl/fsl_dcu_drm_crtc.c
> b/drivers/gpu/drm/fsl/fsl_dcu_drm_crtc.c
> new file mode 100644
> index 0000000..076e273
> --- /dev/null
> +++ b/drivers/gpu/drm/fsl/fsl_dcu_drm_crtc.c
> @@ -0,0 +1,165 @@
> +/*
> + * Copyright 2015 Freescale Semiconductor, Inc.
> + *
> + * Freescale DCU drm device driver
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + */
> +
> +#include <linux/regmap.h>
> +#include <linux/clk.h>
> +
> +#include <drm/drmP.h>
> +#include <drm/drm_atomic.h>
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_crtc.h>
> +
> +#include "fsl_dcu_drm_crtc.h"
> +#include "fsl_dcu_drm_drv.h"
> +#include "fsl_dcu_drm_plane.h"
> +
> +#define to_fsl_dcu_crtc(c)	container_of(c, struct fsl_dcu_drm_crtc, crtc)
> +
> +void fsl_dcu_drm_crtc_suspend(struct drm_crtc *crtc)
> +{
> +}
> +
> +static void fsl_dcu_drm_crtc_mode_set_nofb(struct drm_crtc *crtc)
> +{
> +	struct drm_device *dev = crtc->dev;
> +	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
> +	struct drm_display_mode *mode = &crtc->state->mode;
> +	uint32_t hbp, hfp, hsw, vbp, vfp, vsw, div, index;
> +
> +	DBG(": set mode: %d:\"%s\" %d %d %d %d %d %d %d %d %d %d 0x%x 0x%x",
> +	    mode->base.id, mode->name,
> +	    mode->vrefresh, mode->clock,
> +	    mode->hdisplay, mode->hsync_start,
> +	    mode->hsync_end, mode->htotal,
> +	    mode->vdisplay, mode->vsync_start,
> +	    mode->vsync_end, mode->vtotal,
> +	    mode->type, mode->flags);
> +
> +	index = drm_crtc_index(crtc);
> +	div = (uint32_t)clk_get_rate(fsl_dev->clk) / mode->clock / 1000;
> +
> +	/* Configure timings: */
> +	hbp = mode->htotal - mode->hsync_end;
> +	hfp = mode->hsync_start - mode->hdisplay;
> +	hsw = mode->hsync_end - mode->hsync_start;
> +	vbp = mode->vtotal - mode->vsync_end;
> +	vfp = mode->vsync_start - mode->vdisplay;
> +	vsw = mode->vsync_end - mode->vsync_start;
> +
> +	regmap_write(fsl_dev->regmap, DCU_HSYN_PARA,
> +		     DCU_HSYN_PARA_BP(hbp) |
> +		     DCU_HSYN_PARA_PW(hsw) |
> +		     DCU_HSYN_PARA_FP(hfp));
> +	regmap_write(fsl_dev->regmap, DCU_VSYN_PARA,
> +		     DCU_VSYN_PARA_BP(vbp) |
> +		     DCU_VSYN_PARA_PW(vsw) |
> +		     DCU_VSYN_PARA_FP(vfp));
> +	regmap_write(fsl_dev->regmap, DCU_DISP_SIZE,
> +		     DCU_DISP_SIZE_DELTA_Y(mode->vdisplay) |
> +		     DCU_DISP_SIZE_DELTA_X(mode->hdisplay));
> +	regmap_write(fsl_dev->regmap, DCU_DIV_RATIO, div);
> +	regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE, DCU_UPDATE_MODE_READREG);
> +}
> +
> +static bool fsl_dcu_drm_crtc_mode_fixup(struct drm_crtc *crtc,
> +					const struct drm_display_mode *mode,
> +					struct drm_display_mode *adjusted_mode)
> +{
> +	return true;
> +}
> +
> +static void fsl_dcu_drm_crtc_prepare(struct drm_crtc *crtc)
> +{
> +}
> +
> +/* Now enable the clocks, plane, pipe, and connectors that we set up. */
> +static void fsl_dcu_drm_crtc_mode_commit(struct drm_crtc *crtc)
> +{
> +}
> +
> +static int fsl_dcu_drm_crtc_atomic_check(struct drm_crtc *crtc,
> +					 struct drm_crtc_state *state)
> +{
> +	return 0;
> +}
> +
> +static void fsl_dcu_drm_crtc_atomic_begin(struct drm_crtc *crtc)
> +{
> +}
> +
> +static void fsl_dcu_drm_crtc_atomic_flush(struct drm_crtc *crtc)
> +{
> +}
> +
> +static void fsl_dcu_drm_disable_crtc(struct drm_crtc *crtc)
> +{
> +}
> +
> +static const struct drm_crtc_funcs fsl_dcu_drm_crtc_funcs = {
> +	.page_flip = drm_atomic_helper_page_flip,
> +	.set_config = drm_atomic_helper_set_config,
> +	.destroy = drm_crtc_cleanup,
> +	.reset = drm_atomic_helper_crtc_reset,
> +	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
> +	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
> +};
> +
> +static void fsl_dcu_drm_crtc_dpms(struct drm_crtc *crtc, int mode)
> +{
> +}
> +
> +static const struct drm_crtc_helper_funcs fsl_dcu_drm_crtc_helper_funcs = {
> +	.disable = fsl_dcu_drm_disable_crtc,
> +	.mode_fixup = fsl_dcu_drm_crtc_mode_fixup,
> +	.mode_set = drm_helper_crtc_mode_set,
> +	.mode_set_nofb = fsl_dcu_drm_crtc_mode_set_nofb,
> +	.mode_set_base = drm_helper_crtc_mode_set_base,
> +	.prepare = fsl_dcu_drm_crtc_prepare,
> +	.commit = fsl_dcu_drm_crtc_mode_commit,
> +	.atomic_check = fsl_dcu_drm_crtc_atomic_check,
> +	.atomic_begin = fsl_dcu_drm_crtc_atomic_begin,
> +	.atomic_flush = fsl_dcu_drm_crtc_atomic_flush,
> +	.dpms = fsl_dcu_drm_crtc_dpms,
> +};
> +
> +int fsl_dcu_drm_crtc_create(struct fsl_dcu_drm_device *fsl_dev)
> +{
> +	struct drm_plane *primary;
> +	struct drm_crtc *crtc = &fsl_dev->crtc.crtc;
> +	int ret;
> +
> +	fsl_dev->crtc.dpms = DRM_MODE_DPMS_OFF;
> +
> +	primary = fsl_dcu_drm_primary_create_plane(fsl_dev->ddev);
> +	ret = drm_crtc_init_with_planes(fsl_dev->ddev, crtc, primary, NULL,
> +					&fsl_dcu_drm_crtc_funcs);
> +	if (ret < 0)
> +		return ret;
> +
> +	drm_crtc_helper_add(crtc, &fsl_dcu_drm_crtc_helper_funcs);
> +
> +	regmap_write(fsl_dev->regmap, DCU_SYN_POL,
> +		     DCU_SYN_POL_INV_VS_LOW | DCU_SYN_POL_INV_HS_LOW);
> +	regmap_write(fsl_dev->regmap, DCU_BGND, DCU_BGND_R(0) |
> +		     DCU_BGND_G(0) | DCU_BGND_B(0));
> +	regmap_write(fsl_dev->regmap, DCU_DCU_MODE,
> +		     DCU_MODE_BLEND_ITER(1) | DCU_MODE_RASTER_EN);
> +	regmap_write(fsl_dev->regmap, DCU_THRESHOLD,
> +		     DCU_THRESHOLD_LS_BF_VS(BF_VS_VAL) |
> +		     DCU_THRESHOLD_OUT_BUF_HIGH(BUF_MAX_VAL) |
> +		     DCU_THRESHOLD_OUT_BUF_LOW(BUF_MIN_VAL));
> +	regmap_update_bits(fsl_dev->regmap, DCU_DCU_MODE,
> +			   DCU_MODE_DCU_MODE_MASK,
> +			   DCU_MODE_DCU_MODE(DCU_MODE_OFF));
> +	regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE, DCU_UPDATE_MODE_READREG);
> +
> +	return 0;
> +}
> diff --git a/drivers/gpu/drm/fsl/fsl_dcu_drm_crtc.h
> b/drivers/gpu/drm/fsl/fsl_dcu_drm_crtc.h
> new file mode 100644
> index 0000000..d44b564
> --- /dev/null
> +++ b/drivers/gpu/drm/fsl/fsl_dcu_drm_crtc.h
> @@ -0,0 +1,26 @@
> +/*
> + * Copyright 2015 Freescale Semiconductor, Inc.
> + *
> + * Freescale DCU drm device driver
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + */
> +
> +#ifndef __FSL_DCU_DRM_CRTC_H__
> +#define __FSL_DCU_DRM_CRTC_H__
> +
> +#include <drm/drmP.h>
> +#include <drm/drm_crtc.h>
> +
> +struct fsl_dcu_drm_device;
> +struct fsl_dcu_drm_crtc {
> +	struct drm_crtc crtc;
> +	int dpms;
> +};
> +
> +int fsl_dcu_drm_crtc_create(struct fsl_dcu_drm_device *fsl_dev);
> +
> +#endif /* __FSL_DCU_DRM_CRTC_H__ */
> diff --git a/drivers/gpu/drm/fsl/fsl_dcu_drm_drv.c
> b/drivers/gpu/drm/fsl/fsl_dcu_drm_drv.c
> new file mode 100644
> index 0000000..d4a559a
> --- /dev/null
> +++ b/drivers/gpu/drm/fsl/fsl_dcu_drm_drv.c
> @@ -0,0 +1,331 @@
> +/*
> + * Copyright 2015 Freescale Semiconductor, Inc.
> + *
> + * Freescale DCU drm device driver
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/io.h>
> +#include <linux/mm.h>
> +#include <linux/module.h>
> +#include <linux/of_platform.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/regmap.h>
> +
> +#include <drm/drmP.h>
> +#include <linux/fsl/dcu.h>

This file seems to be missing in that patch.

> +
> +#include "fsl_dcu_drm_drv.h"
> +#include "fsl_dcu_drm_kms.h"
> +
> +static int fsl_dcu_unload(struct drm_device *dev)
> +{
> +	drm_mode_config_cleanup(dev);
> +	drm_vblank_cleanup(dev);
> +	drm_irq_uninstall(dev);
> +
> +	dev->dev_private = NULL;
> +
> +	return 0;
> +}
> +
> +static struct regmap_config fsl_dcu_regmap_config = {
> +	.reg_bits = 32,
> +	.reg_stride = 4,
> +	.val_bits = 32,
> +};
> +
> +static int fsl_dcu_bypass_tcon(struct fsl_dcu_drm_device *fsl_dev,
> +			       struct device_node *np)
> +{
> +	struct device_node *tcon_np;
> +	struct platform_device *pdev;
> +	struct clk *tcon_clk;
> +	struct resource *res;
> +	void __iomem *base;
> +
> +	tcon_np = of_parse_phandle(np, "tcon-controller", 0);
> +	if (!tcon_np)
> +		return -EINVAL;
> +
> +	pdev = of_find_device_by_node(tcon_np);
> +	if (!pdev)
> +		return -EINVAL;
> +
> +	tcon_clk = devm_clk_get(&pdev->dev, "tcon");
> +	if (IS_ERR(tcon_clk))
> +		return PTR_ERR(tcon_clk);
> +	clk_prepare_enable(tcon_clk);

You enable the clock explicitly...

> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	if (!res)
> +		return -ENODEV;
> +
> +	base = devm_ioremap_resource(&pdev->dev, res);
> +	if (IS_ERR(base))
> +		return PTR_ERR(base);
> +
> +	fsl_dev->tcon_regmap = devm_regmap_init_mmio_clk(&pdev->dev,
> +			"tcon", base, &fsl_dcu_regmap_config);

And implicitly using regmap. In a short test on Vybrid, the clock is
actually not needed during operation, hence we could use the explicit
enabling above, what do you think?

Also, the clock and tcon in general currently does not get handled by
suspend/resume code...

> +	if (IS_ERR(fsl_dev->tcon_regmap)) {
> +		dev_err(&pdev->dev, "regmap init failed\n");
> +		return PTR_ERR(fsl_dev->tcon_regmap);
> +	}
> +
> +	regmap_write(fsl_dev->tcon_regmap, TCON_CTRL1, TCON_BYPASS_ENABLE);
> +	return 0;
> +}
> +
> +static int fsl_dcu_drm_irq_init(struct drm_device *dev)
> +{
> +	struct platform_device *pdev = dev->platformdev;
> +	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
> +	unsigned int int_mask;
> +	int ret;
> +
> +	ret = drm_irq_install(dev, platform_get_irq(dev->platformdev, 0));
> +	if (ret < 0)
> +		dev_err(&pdev->dev, "failed to install IRQ handler\n");
> +
> +	dev->irq_enabled = true;
> +	dev->vblank_disable_allowed = true;
> +
> +	regmap_write(fsl_dev->regmap, DCU_INT_STATUS, 0);
> +	regmap_read(fsl_dev->regmap, DCU_INT_MASK, &int_mask);
> +	regmap_write(fsl_dev->regmap, DCU_INT_MASK, int_mask &
> +		     ~DCU_INT_MASK_VBLANK);
> +	regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE, DCU_UPDATE_MODE_READREG);
> +
> +	return 0;
> +}
> +
> +static int fsl_dcu_load(struct drm_device *dev, unsigned long flags)
> +{
> +	struct platform_device *pdev = dev->platformdev;
> +	struct fsl_dcu_drm_device *fsl_dev;
> +	struct resource *res;
> +	void __iomem *base;
> +	int ret;
> +
> +	fsl_dev = devm_kzalloc(&pdev->dev, sizeof(*fsl_dev), GFP_KERNEL);
> +	if (!fsl_dev)
> +		return -ENOMEM;
> +
> +	fsl_dev->dev = &pdev->dev;
> +	fsl_dev->ddev = dev;
> +	fsl_dev->np = pdev->dev.of_node;
> +	dev->dev_private = fsl_dev;
> +	drm_dev_set_unique(dev, dev_name(dev->dev));
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	if (!res) {
> +		dev_err(&pdev->dev, "could not get memory IO resource\n");
> +		return -ENODEV;
> +	}
> +
> +	base = devm_ioremap_resource(&pdev->dev, res);
> +	if (IS_ERR(base)) {
> +		ret = PTR_ERR(base);
> +		return ret;
> +	}
> +
> +	fsl_dev->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL,
> +			base, &fsl_dcu_regmap_config);
> +	if (IS_ERR(fsl_dev->regmap)) {
> +		dev_err(&pdev->dev, "regmap init failed\n");
> +		return PTR_ERR(fsl_dev->regmap);
> +	}
> +
> +	/* Put TCON in bypass mode, so the input signals from DCU are passed
> +	 * through TCON unchanged */
> +	fsl_dcu_bypass_tcon(fsl_dev, fsl_dev->np);
> +	fsl_dev->clk = devm_clk_get(&pdev->dev, "dcu");
> +	if (IS_ERR(fsl_dev->clk)) {
> +		ret = PTR_ERR(fsl_dev->clk);
> +		dev_err(&pdev->dev, "could not get clock\n");
> +		return ret;
> +	}
> +	clk_prepare_enable(fsl_dev->clk);
> +	dev_set_drvdata(dev->dev, fsl_dev);
> +
> +	ret = fsl_dcu_drm_modeset_init(fsl_dev);
> +	if (ret < 0) {
> +		dev_err(&pdev->dev, "failed to initialize mode setting\n");
> +		return ret;
> +	}
> +
> +	ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
> +	if (ret < 0) {
> +		dev_err(&pdev->dev, "failed to initialize vblank\n");
> +		goto done;
> +	}
> +
> +	ret = fsl_dcu_drm_irq_init(dev);
> +	if (ret < 0)
> +		goto done;
> +
> +	fsl_dcu_fbdev_init(dev);
> +
> +	return 0;
> +done:
> +	if (ret)
> +		fsl_dcu_unload(dev);
> +
> +	return ret;
> +}
> +
> +static void fsl_dcu_drm_preclose(struct drm_device *dev, struct drm_file *file)
> +{
> +	;
> +}
> +
> +static irqreturn_t fsl_dcu_drm_irq(int irq, void *arg)
> +{
> +	struct drm_device *dev = arg;
> +	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
> +	unsigned int int_status;
> +
> +	regmap_read(fsl_dev->regmap, DCU_INT_STATUS, &int_status);
> +	if (int_status & DCU_INT_STATUS_VBLANK)
> +		drm_handle_vblank(dev, 0);
> +
> +	regmap_write(fsl_dev->regmap, DCU_INT_STATUS, 0xffffffff);
> +	regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE, DCU_UPDATE_MODE_READREG);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static int fsl_dcu_drm_enable_vblank(struct drm_device *dev, int crtc)
> +{
> +	return 0;
> +}
> +
> +static void fsl_dcu_drm_disable_vblank(struct drm_device *dev, int crtc)
> +{
> +	;
> +}
> +
> +static const struct file_operations fsl_dcu_drm_fops = {
> +	.owner		= THIS_MODULE,
> +	.open		= drm_open,
> +	.release	= drm_release,
> +	.unlocked_ioctl	= drm_ioctl,
> +#ifdef CONFIG_COMPAT
> +	.compat_ioctl	= drm_compat_ioctl,
> +#endif
> +	.poll		= drm_poll,
> +	.read		= drm_read,
> +	.llseek		= no_llseek,
> +	.mmap		= drm_gem_cma_mmap,
> +};
> +
> +static struct drm_driver fsl_dcu_drm_driver = {
> +	.driver_features	= DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET
> +				| DRIVER_PRIME,
> +	.load			= fsl_dcu_load,
> +	.unload			= fsl_dcu_unload,
> +	.preclose		= fsl_dcu_drm_preclose,
> +	.irq_handler		= fsl_dcu_drm_irq,
> +	.get_vblank_counter	= drm_vblank_count,
> +	.enable_vblank		= fsl_dcu_drm_enable_vblank,
> +	.disable_vblank		= fsl_dcu_drm_disable_vblank,
> +	.gem_free_object	= drm_gem_cma_free_object,
> +	.gem_vm_ops		= &drm_gem_cma_vm_ops,
> +	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
> +	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
> +	.gem_prime_import	= drm_gem_prime_import,
> +	.gem_prime_export	= drm_gem_prime_export,
> +	.gem_prime_get_sg_table	= drm_gem_cma_prime_get_sg_table,
> +	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
> +	.gem_prime_vmap		= drm_gem_cma_prime_vmap,
> +	.gem_prime_vunmap	= drm_gem_cma_prime_vunmap,
> +	.gem_prime_mmap		= drm_gem_cma_prime_mmap,
> +	.dumb_create		= drm_gem_cma_dumb_create,
> +	.dumb_map_offset	= drm_gem_cma_dumb_map_offset,
> +	.dumb_destroy		= drm_gem_dumb_destroy,
> +	.fops			= &fsl_dcu_drm_fops,
> +	.name			= "fsl-dcu-drm",
> +	.desc			= "Freescale DCU DRM",
> +	.date			= "20150213",
> +	.major			= 1,
> +	.minor			= 0,
> +};
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int fsl_dcu_drm_pm_suspend(struct device *dev)
> +{
> +	struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
> +
> +	if (of_device_is_compatible(fsl_dev->np, "fsl,ls1021a-dcu"))
> +		dcu_pixclk_disable();
> +
> +	drm_kms_helper_poll_disable(fsl_dev->ddev);
> +	fsl_dcu_drm_crtc_suspend(&fsl_dev->crtc);

I get

drivers/gpu/drm/fsl/fsl_dcu_drm_drv.c: In function
'fsl_dcu_drm_pm_suspend':
drivers/gpu/drm/fsl/fsl_dcu_drm_drv.c:270:2: error: implicit declaration
of function 'fsl_dcu_drm_crtc_suspend'
[-Werror=implicit-function-declaration]
  fsl_dcu_drm_crtc_suspend(&fsl_dev->crtc);
  ^
drivers/gpu/drm/fsl/fsl_dcu_drm_drv.c: In function
'fsl_dcu_drm_pm_resume':
drivers/gpu/drm/fsl/fsl_dcu_drm_drv.c:280:2: error: implicit declaration
of function 'fsl_dcu_drm_crtc_resume'
[-Werror=implicit-function-declaration]
  fsl_dcu_drm_crtc_resume(&fsl_dev->crtc);
  ^

The function fsl_dcu_drm_crtc_suspend seems to be part of
fsl_dcu_drm_crtc.c, but is empty. While the other is missing
completely... Please fix/remove as appropriate.

> +
> +	return 0;
> +}
> +
> +static int fsl_dcu_drm_pm_resume(struct device *dev)
> +{
> +	struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
> +
> +	drm_modeset_lock_all(fsl_dev->ddev);
> +	fsl_dcu_drm_crtc_resume(&fsl_dev->crtc);
> +	drm_modeset_unlock_all(fsl_dev->ddev);
> +	drm_kms_helper_poll_enable(fsl_dev->ddev);
> +
> +	if (of_device_is_compatible(fsl_dev->np, "fsl,ls1021a-dcu"))
> +		dcu_pixclk_enable();
> +
> +	return 0;
> +}
> +#endif
> +
> +static const struct dev_pm_ops fsl_dcu_drm_pm_ops = {
> +	SET_SYSTEM_SLEEP_PM_OPS(fsl_dcu_drm_pm_suspend, fsl_dcu_drm_pm_resume)
> +};
> +
> +static int fsl_dcu_drm_probe(struct platform_device *pdev)
> +{
> +	return drm_platform_init(&fsl_dcu_drm_driver, pdev);
> +}
> +
> +static int fsl_dcu_drm_remove(struct platform_device *pdev)
> +{
> +	struct fsl_dcu_drm_device *fsl_dev = platform_get_drvdata(pdev);
> +
> +	drm_put_dev(fsl_dev->ddev);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id fsl_dcu_of_match[] = {
> +		{ .compatible = "fsl,ls1021a-dcu", },
> +		{ .compatible = "fsl,vf610-dcu", },
> +		{ },
> +};
> +MODULE_DEVICE_TABLE(of, fsl_dcu_of_match);
> +
> +static struct platform_driver fsl_dcu_drm_platform_driver = {
> +	.probe		= fsl_dcu_drm_probe,
> +	.remove		= fsl_dcu_drm_remove,
> +	.driver		= {
> +		.owner	= THIS_MODULE,
> +		.name	= "fsl,dcu",
> +		.pm	= &fsl_dcu_drm_pm_ops,
> +		.of_match_table = fsl_dcu_of_match,
> +	},
> +};
> +
> +module_platform_driver(fsl_dcu_drm_platform_driver);
> +
> +MODULE_ALIAS("platform:fsl-dcu-drm");
> +MODULE_DESCRIPTION("Freescale DCU DRM Driver");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/gpu/drm/fsl/fsl_dcu_drm_drv.h
> b/drivers/gpu/drm/fsl/fsl_dcu_drm_drv.h
> new file mode 100644
> index 0000000..27226109
> --- /dev/null
> +++ b/drivers/gpu/drm/fsl/fsl_dcu_drm_drv.h
> @@ -0,0 +1,210 @@
> +/*
> + * Copyright 2015 Freescale Semiconductor, Inc.
> + *
> + * Freescale DCU drm device driver
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + */
> +
> +#ifndef __FSL_DCU_DRM_DRV_H__
> +#define __FSL_DCU_DRM_DRV_H__
> +
> +#include <linux/kernel.h>
> +#include <linux/spinlock.h>
> +#include <stddef.h>
> +#include <drm/drm.h>
> +#include <drm/drmP.h>
> +#include <drm/drm_fb_helper.h>
> +#include <drm/drm_crtc_helper.h>
> +#include <drm/drm_gem_cma_helper.h>
> +#include <drm/drm_fb_cma_helper.h>
> +
> +#include "fsl_dcu_drm_crtc.h"
> +#include "fsl_dcu_drm_plane.h"
> +#include "fsl_dcu_drm_connector.h"
> +#define DRIVER_NAME			"fsl-dcu-drm"
> +
> +#define DCU_DCU_MODE			0x0010
> +#define DCU_MODE_BLEND_ITER(x)		((x) << 20)
> +#define DCU_MODE_RASTER_EN		BIT(14)
> +#define DCU_MODE_DCU_MODE(x)		(x)
> +#define DCU_MODE_DCU_MODE_MASK		0x03
> +#define DCU_MODE_OFF			0
> +#define DCU_MODE_NORMAL			1
> +#define DCU_MODE_TEST			2
> +#define DCU_MODE_COLORBAR		3
> +
> +#define DCU_BGND			0x0014
> +#define DCU_BGND_R(x)			((x) << 16)
> +#define DCU_BGND_G(x)			((x) << 8)
> +#define DCU_BGND_B(x)			(x)
> +
> +#define DCU_DISP_SIZE			0x0018
> +#define DCU_DISP_SIZE_DELTA_Y(x)	((x) << 16)
> +/*Regisiter value 1/16 of horizontal resolution*/
> +#define DCU_DISP_SIZE_DELTA_X(x)	((x) >> 4)
> +
> +#define DCU_HSYN_PARA			0x001c
> +#define DCU_HSYN_PARA_BP(x)		((x) << 22)
> +#define DCU_HSYN_PARA_PW(x)		((x) << 11)
> +#define DCU_HSYN_PARA_FP(x)		(x)
> +
> +#define DCU_VSYN_PARA			0x0020
> +#define DCU_VSYN_PARA_BP(x)		((x) << 22)
> +#define DCU_VSYN_PARA_PW(x)		((x) << 11)
> +#define DCU_VSYN_PARA_FP(x)		(x)
> +
> +#define DCU_SYN_POL			0x0024
> +#define DCU_SYN_POL_INV_PXCK_FALL	(0 << 6)
> +#define DCU_SYN_POL_NEG_REMAIN		(0 << 5)
> +#define DCU_SYN_POL_INV_VS_LOW		BIT(1)
> +#define DCU_SYN_POL_INV_HS_LOW		BIT(0)
> +
> +#define DCU_THRESHOLD			0x0028
> +#define DCU_THRESHOLD_LS_BF_VS(x)	((x) << 16)
> +#define DCU_THRESHOLD_OUT_BUF_HIGH(x)	((x) << 8)
> +#define DCU_THRESHOLD_OUT_BUF_LOW(x)	(x)
> +#define BF_VS_VAL			0x03
> +#define BUF_MAX_VAL			0x78
> +#define BUF_MIN_VAL			0x0a
> +
> +#define DCU_INT_STATUS			0x002C
> +#define DCU_INT_STATUS_VSYNC		BIT(0)
> +#define DCU_INT_STATUS_UNDRUN		BIT(1)
> +#define DCU_INT_STATUS_LSBFVS		BIT(2)
> +#define DCU_INT_STATUS_VBLANK		BIT(3)
> +#define DCU_INT_STATUS_CRCREADY		BIT(4)
> +#define DCU_INT_STATUS_CRCOVERFLOW	BIT(5)
> +#define DCU_INT_STATUS_P1FIFOLO		BIT(6)
> +#define DCU_INT_STATUS_P1FIFOHI		BIT(7)
> +#define DCU_INT_STATUS_P2FIFOLO		BIT(8)
> +#define DCU_INT_STATUS_P2FIFOHI		BIT(9)
> +#define DCU_INT_STATUS_PROGEND		BIT(10)
> +#define DCU_INT_STATUS_IPMERROR		BIT(11)
> +#define DCU_INT_STATUS_LYRTRANS		BIT(12)
> +#define DCU_INT_STATUS_DMATRANS		BIT(14)
> +#define DCU_INT_STATUS_P3FIFOLO		BIT(16)
> +#define DCU_INT_STATUS_P3FIFOHI		BIT(17)
> +#define DCU_INT_STATUS_P4FIFOLO		BIT(18)
> +#define DCU_INT_STATUS_P4FIFOHI		BIT(19)
> +#define DCU_INT_STATUS_P1EMPTY		BIT(26)
> +#define DCU_INT_STATUS_P2EMPTY		BIT(27)
> +#define DCU_INT_STATUS_P3EMPTY		BIT(28)
> +#define DCU_INT_STATUS_P4EMPTY		BIT(29)
> +
> +#define DCU_INT_MASK			0x0030
> +#define DCU_INT_MASK_VSYNC		BIT(0)
> +#define DCU_INT_MASK_UNDRUN		BIT(1)
> +#define DCU_INT_MASK_LSBFVS		BIT(2)
> +#define DCU_INT_MASK_VBLANK		BIT(3)
> +#define DCU_INT_MASK_CRCREADY		BIT(4)
> +#define DCU_INT_MASK_CRCOVERFLOW	BIT(5)
> +#define DCU_INT_MASK_P1FIFOLO		BIT(6)
> +#define DCU_INT_MASK_P1FIFOHI		BIT(7)
> +#define DCU_INT_MASK_P2FIFOLO		BIT(8)
> +#define DCU_INT_MASK_P2FIFOHI		BIT(9)
> +#define DCU_INT_MASK_PROGEND		BIT(10)
> +#define DCU_INT_MASK_IPMERROR		BIT(11)
> +#define DCU_INT_MASK_LYRTRANS		BIT(12)
> +#define DCU_INT_MASK_DMATRANS		BIT(14)
> +#define DCU_INT_MASK_P3FIFOLO		BIT(16)
> +#define DCU_INT_MASK_P3FIFOHI		BIT(17)
> +#define DCU_INT_MASK_P4FIFOLO		BIT(18)
> +#define DCU_INT_MASK_P4FIFOHI		BIT(19)
> +#define DCU_INT_MASK_P1EMPTY		BIT(26)
> +#define DCU_INT_MASK_P2EMPTY		BIT(27)
> +#define DCU_INT_MASK_P3EMPTY		BIT(28)
> +#define DCU_INT_MASK_P4EMPTY		BIT(29)
> +
> +#define DCU_DIV_RATIO			0x0054
> +
> +#define DCU_UPDATE_MODE			0x00cc
> +#define DCU_UPDATE_MODE_MODE		BIT(31)
> +#define DCU_UPDATE_MODE_READREG		BIT(30)
> +
> +#define DCU_DCFB_MAX			0x300
> +
> +#define DCU_CTRLDESCLN_1(x)		(0x200 + (x) * 0x40)
> +#define DCU_CTRLDESCLN_1_HEIGHT(x)	((x) << 16)
> +#define DCU_CTRLDESCLN_1_WIDTH(x)	(x)
> +
> +#define DCU_CTRLDESCLN_2(x)		(0x204 + (x) * 0x40)
> +#define DCU_CTRLDESCLN_2_POSY(x)	((x) << 16)
> +#define DCU_CTRLDESCLN_2_POSX(x)	(x)
> +
> +#define DCU_CTRLDESCLN_3(x)		(0x208 + (x) * 0x40)
> +
> +#define DCU_CTRLDESCLN_4(x)		(0x20c + (x) * 0x40)
> +#define DCU_CTRLDESCLN_4_EN		BIT(31)
> +#define DCU_CTRLDESCLN_4_TILE_EN	BIT(30)
> +#define DCU_CTRLDESCLN_4_DATA_SEL_CLUT	BIT(29)
> +#define DCU_CTRLDESCLN_4_SAFETY_EN	BIT(28)
> +#define DCU_CTRLDESCLN_4_TRANS(x)	((x) << 20)
> +#define DCU_CTRLDESCLN_4_BPP(x)		((x) << 16)
> +#define DCU_CTRLDESCLN_4_RLE_EN		BIT(15)
> +#define DCU_CTRLDESCLN_4_LUOFFS(x)	((x) << 4)
> +#define DCU_CTRLDESCLN_4_BB_ON		BIT(2)
> +#define DCU_CTRLDESCLN_4_AB(x)		(x)
> +
> +#define DCU_CTRLDESCLN_5(x)		(0x210 + (x) * 0x40)
> +#define DCU_CTRLDESCLN_5_CKMAX_R(x)	((x) << 16)
> +#define DCU_CTRLDESCLN_5_CKMAX_G(x)	((x) << 8)
> +#define DCU_CTRLDESCLN_5_CKMAX_B(x)	(x)
> +
> +#define DCU_CTRLDESCLN_6(x)		(0x214 + (x) * 0x40)
> +#define DCU_CTRLDESCLN_6_CKMIN_R(x)	((x) << 16)
> +#define DCU_CTRLDESCLN_6_CKMIN_G(x)	((x) << 8)
> +#define DCU_CTRLDESCLN_6_CKMIN_B(x)	(x)
> +
> +#define DCU_CTRLDESCLN_7(x)		(0x218 + (x) * 0x40)
> +#define DCU_CTRLDESCLN_7_TILE_VER(x)	((x) << 16)
> +#define DCU_CTRLDESCLN_7_TILE_HOR(x)	(x)
> +
> +#define DCU_CTRLDESCLN_8(x)		(0x21c + (x) * 0x40)
> +#define DCU_CTRLDESCLN_8_FG_FCOLOR(x)	(x)
> +
> +#define DCU_CTRLDESCLN_9(x)		(0x220 + (x) * 0x40)
> +#define DCU_CTRLDESCLN_9_BG_BCOLOR(x)	(x)
> +
> +#define DCU_CTRLDESCLN_10(x)		(0x224 + (x) * 0x40)
> +#define DCU_CTRLDESCLN_10_POST_SKIP(x)	((x) << 16)
> +#define DCU_CTRLDESCLN_10_PRE_SKIP(x)	(x)
> +
> +#define FSL_DCU_RGB565			4
> +#define FSL_DCU_RGB888			5
> +#define FSL_DCU_ARGB8888		6
> +#define FSL_DCU_ARGB1555		11
> +#define FSL_DCU_ARGB4444		12
> +#define FSL_DCU_YUV422			14
> +
> +#define TCON_CTRL1			0x0000
> +#define TCON_BYPASS_ENABLE		BIT(29)
> +
> +#define DBG(fmt, ...) DRM_DEBUG(fmt"\n", ##__VA_ARGS__)
> +
> +struct clk;
> +struct device;
> +struct drm_device;
> +
> +struct fsl_dcu_drm_device {
> +	struct device *dev;
> +	struct device_node *np;
> +	struct regmap *regmap;
> +	struct regmap *tcon_regmap;
> +	unsigned int irq;
> +	struct clk *clk;
> +	/*protects hardware register*/
> +	spinlock_t irq_lock;
> +	struct drm_device *ddev;
> +	struct drm_fbdev_cma *fbdev;
> +	struct fsl_dcu_drm_crtc crtc;
> +	struct drm_encoder encoder;
> +	struct fsl_dcu_drm_connector connector;
> +};
> +
> +void fsl_dcu_fbdev_init(struct drm_device *dev);
> +
> +#endif /* __FSL_DCU_DRM_DRV_H__ */
> diff --git a/drivers/gpu/drm/fsl/fsl_dcu_drm_fbdev.c
> b/drivers/gpu/drm/fsl/fsl_dcu_drm_fbdev.c
> new file mode 100644
> index 0000000..f8ef0e1
> --- /dev/null
> +++ b/drivers/gpu/drm/fsl/fsl_dcu_drm_fbdev.c
> @@ -0,0 +1,26 @@
> +/*
> + * Copyright 2015 Freescale Semiconductor, Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License version 2 as published by
> + * the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
> + * more details.
> + *
> + */
> +
> +#include <drm/drmP.h>
> +#include <drm/drm_fb_cma_helper.h>
> +
> +#include "fsl_dcu_drm_drv.h"
> +
> +/* initialize fbdev helper */
> +void fsl_dcu_fbdev_init(struct drm_device *dev)
> +{
> +	struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev->dev);
> +
> +	fsl_dev->fbdev = drm_fbdev_cma_init(dev, 24, 1, 1);
> +}
> diff --git a/drivers/gpu/drm/fsl/fsl_dcu_drm_kms.c
> b/drivers/gpu/drm/fsl/fsl_dcu_drm_kms.c
> new file mode 100644
> index 0000000..0de21c6
> --- /dev/null
> +++ b/drivers/gpu/drm/fsl/fsl_dcu_drm_kms.c
> @@ -0,0 +1,42 @@
> +/*
> + * Copyright 2015 Freescale Semiconductor, Inc.
> + *
> + * Freescale DCU drm device driver
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + */
> +
> +#include <drm/drmP.h>
> +#include <drm/drm_atomic_helper.h>
> +
> +#include "fsl_dcu_drm_crtc.h"
> +#include "fsl_dcu_drm_connector.h"
> +#include "fsl_dcu_drm_drv.h"
> +
> +static const struct drm_mode_config_funcs fsl_dcu_drm_mode_config_funcs = {
> +	.fb_create = drm_fb_cma_create,
> +	.atomic_check = drm_atomic_helper_check,
> +	.atomic_commit = drm_atomic_helper_commit,
> +};
> +
> +int fsl_dcu_drm_modeset_init(struct fsl_dcu_drm_device *fsl_dev)
> +{
> +	drm_mode_config_init(fsl_dev->ddev);
> +
> +	fsl_dev->ddev->mode_config.min_width = 0;
> +	fsl_dev->ddev->mode_config.min_height = 0;
> +	fsl_dev->ddev->mode_config.max_width = 2031;
> +	fsl_dev->ddev->mode_config.max_height = 2047;
> +	fsl_dev->ddev->mode_config.funcs = &fsl_dcu_drm_mode_config_funcs;
> +
> +	drm_kms_helper_poll_init(fsl_dev->ddev);
> +	fsl_dcu_drm_crtc_create(fsl_dev);
> +	fsl_dcu_drm_encoder_create(fsl_dev, &fsl_dev->crtc);
> +	fsl_dcu_drm_connector_create(fsl_dev, &fsl_dev->encoder);
> +	drm_mode_config_reset(fsl_dev->ddev);
> +
> +	return 0;
> +}
> diff --git a/drivers/gpu/drm/fsl/fsl_dcu_drm_kms.h
> b/drivers/gpu/drm/fsl/fsl_dcu_drm_kms.h
> new file mode 100644
> index 0000000..b9bd299
> --- /dev/null
> +++ b/drivers/gpu/drm/fsl/fsl_dcu_drm_kms.h
> @@ -0,0 +1,17 @@
> +/*
> + * Copyright 2015 Freescale Semiconductor, Inc.
> + *
> + * Freescale DCU drm device driver
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + */
> +
> +#ifndef __FSL_DCU_DRM_KMS_H__
> +#define __FSL_DCU_DRM_KMS_H__
> +
> +int fsl_dcu_drm_modeset_init(struct fsl_dcu_drm_device *fsl_dev);
> +
> +#endif /* __FSL_DCU_DRM_KMS_H__ */
> diff --git a/drivers/gpu/drm/fsl/fsl_dcu_drm_plane.c
> b/drivers/gpu/drm/fsl/fsl_dcu_drm_plane.c
> new file mode 100644
> index 0000000..6146e80
> --- /dev/null
> +++ b/drivers/gpu/drm/fsl/fsl_dcu_drm_plane.c
> @@ -0,0 +1,192 @@
> +/*
> + * Copyright 2015 Freescale Semiconductor, Inc.
> + *
> + * Freescale DCU drm device driver
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + */
> +
> +#include <drm/drmP.h>
> +#include <drm/drm_crtc.h>
> +#include <drm/drm_crtc_helper.h>
> +#include <drm/drm_fb_cma_helper.h>
> +#include <drm/drm_gem_cma_helper.h>
> +#include <linux/regmap.h>
> +#include <drm/drm_plane_helper.h>
> +#include <drm/drm_atomic_helper.h>
> +
> +#include "fsl_dcu_drm_drv.h"
> +#include "fsl_dcu_drm_kms.h"
> +#include "fsl_dcu_drm_plane.h"
> +
> +#define to_fsl_dcu_plane(plane) \
> +	container_of(plane, struct fsl_dcu_drm_plane, plane)
> +
> +static int
> +fsl_dcu_drm_plane_prepare_fb(struct drm_plane *plane,
> +			     struct drm_framebuffer *fb,
> +			     const struct drm_plane_state *new_state)
> +{
> +	return 0;
> +}
> +
> +static void
> +fsl_dcu_drm_plane_cleanup_fb(struct drm_plane *plane,
> +			     struct drm_framebuffer *fb,
> +			     const struct drm_plane_state *new_state)
> +{
> +}
> +
> +static int fsl_dcu_drm_plane_atomic_check(struct drm_plane *plane,
> +					  struct drm_plane_state *state)
> +{
> +	return 0;
> +}
> +
> +static void fsl_dcu_drm_plane_atomic_disable(struct drm_plane *plane,
> +					     struct drm_plane_state *old_state)
> +{
> +}
> +
> +void fsl_dcu_drm_plane_atomic_update(struct drm_plane *plane,
> +				     struct drm_plane_state *old_state)
> +{
> +	struct fsl_dcu_drm_device *fsl_dev = plane->dev->dev_private;
> +	struct drm_plane_state *state = plane->state;
> +	struct drm_framebuffer *fb = plane->state->fb;
> +	u32 index, alpha, bpp;
> +	struct drm_gem_cma_object *gem;
> +	struct fsl_dcu_drm_plane *fsl_plane = to_fsl_dcu_plane(plane);
> +
> +	index = fsl_plane->index;
> +	gem = drm_fb_cma_get_gem_obj(fb, 0);
> +
> +	switch (fb->pixel_format) {
> +	case DRM_FORMAT_RGB565:
> +		bpp = FSL_DCU_RGB565;
> +		alpha = 0xff;
> +		break;
> +	case DRM_FORMAT_RGB888:
> +		bpp = FSL_DCU_RGB888;
> +		alpha = 0xff;
> +		break;
> +	case DRM_FORMAT_ARGB8888:
> +		bpp = FSL_DCU_ARGB8888;
> +		alpha = 0xff;
> +		break;
> +	case DRM_FORMAT_BGRA4444:
> +		bpp = FSL_DCU_ARGB4444;
> +		alpha = 0xff;
> +		break;
> +	case DRM_FORMAT_ARGB1555:
> +		bpp = FSL_DCU_ARGB1555;
> +		alpha = 0xff;
> +		break;
> +	case DRM_FORMAT_YUV422:
> +		bpp = FSL_DCU_YUV422;
> +		alpha = 0xff;
> +		break;
> +	default:
> +		return;
> +	}
> +
> +	regmap_write(fsl_dev->regmap, DCU_CTRLDESCLN_1(index),
> +		     DCU_CTRLDESCLN_1_HEIGHT(state->crtc_h) |
> +		     DCU_CTRLDESCLN_1_WIDTH(state->crtc_w));
> +	regmap_write(fsl_dev->regmap, DCU_CTRLDESCLN_2(index),
> +		     DCU_CTRLDESCLN_2_POSY(state->crtc_y) |
> +		     DCU_CTRLDESCLN_2_POSX(state->crtc_x));
> +	regmap_write(fsl_dev->regmap, DCU_CTRLDESCLN_3(index), gem->paddr);
> +	regmap_write(fsl_dev->regmap, DCU_CTRLDESCLN_4(index),
> +		     DCU_CTRLDESCLN_4_EN |
> +		     DCU_CTRLDESCLN_4_TRANS(alpha) |
> +		     DCU_CTRLDESCLN_4_BPP(bpp) |
> +		     DCU_CTRLDESCLN_4_AB(0));
> +	regmap_write(fsl_dev->regmap, DCU_CTRLDESCLN_5(index),
> +		     DCU_CTRLDESCLN_5_CKMAX_R(0xFF) |
> +		     DCU_CTRLDESCLN_5_CKMAX_G(0xFF) |
> +		     DCU_CTRLDESCLN_5_CKMAX_B(0xFF));
> +	regmap_write(fsl_dev->regmap, DCU_CTRLDESCLN_6(index),
> +		     DCU_CTRLDESCLN_6_CKMIN_R(0) |
> +		     DCU_CTRLDESCLN_6_CKMIN_G(0) |
> +		     DCU_CTRLDESCLN_6_CKMIN_B(0));
> +	regmap_write(fsl_dev->regmap, DCU_CTRLDESCLN_7(index), 0);
> +	regmap_write(fsl_dev->regmap, DCU_CTRLDESCLN_8(index),
> +		     DCU_CTRLDESCLN_8_FG_FCOLOR(0));
> +	regmap_write(fsl_dev->regmap, DCU_CTRLDESCLN_9(index),
> +		     DCU_CTRLDESCLN_9_BG_BCOLOR(0));
> +	if (of_device_is_compatible(fsl_dev->np, "fsl,ls1021a-dcu"))
> +		regmap_write(fsl_dev->regmap, DCU_CTRLDESCLN_10(index),
> +			     DCU_CTRLDESCLN_10_POST_SKIP(0) |
> +			     DCU_CTRLDESCLN_10_PRE_SKIP(0));
> +	regmap_update_bits(fsl_dev->regmap, DCU_DCU_MODE,
> +			   DCU_MODE_DCU_MODE_MASK,
> +			   DCU_MODE_DCU_MODE(DCU_MODE_NORMAL));
> +	regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE, DCU_UPDATE_MODE_READREG);
> +}
> +
> +int fsl_dcu_drm_plane_disable(struct drm_plane *plane)
> +{
> +	return 0;
> +}
> +
> +void fsl_dcu_drm_plane_destroy(struct drm_plane *plane)
> +{
> +	fsl_dcu_drm_plane_disable(plane);
> +	drm_plane_cleanup(plane);
> +}
> +
> +static const uint32_t fsl_dcu_drm_plane_formats[] = {
> +	DRM_FORMAT_RGB565,
> +	DRM_FORMAT_RGB888,
> +	DRM_FORMAT_ARGB8888,
> +	DRM_FORMAT_ARGB4444,
> +	DRM_FORMAT_ARGB1555,
> +	DRM_FORMAT_YUV422,
> +};
> +
> +static const struct drm_plane_funcs fsl_dcu_drm_plane_funcs = {
> +	.update_plane = drm_atomic_helper_update_plane,
> +	.disable_plane = drm_atomic_helper_disable_plane,
> +	.destroy = fsl_dcu_drm_plane_destroy,
> +	.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
> +	.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
> +	.reset = drm_atomic_helper_plane_reset,
> +};
> +
> +static const struct drm_plane_helper_funcs fsl_dcu_drm_plane_helper_funcs = {
> +	.prepare_fb = fsl_dcu_drm_plane_prepare_fb,
> +	.cleanup_fb = fsl_dcu_drm_plane_cleanup_fb,
> +	.atomic_check = fsl_dcu_drm_plane_atomic_check,
> +	.atomic_update = fsl_dcu_drm_plane_atomic_update,
> +	.atomic_disable = fsl_dcu_drm_plane_atomic_disable,
> +};
> +
> +struct drm_plane *fsl_dcu_drm_primary_create_plane(struct drm_device *dev)
> +{
> +	struct drm_plane *primary;
> +	int ret;
> +
> +	primary = kzalloc(sizeof(*primary), GFP_KERNEL);
> +	if (!primary) {
> +		DRM_DEBUG_KMS("Failed to allocate primary plane\n");
> +		return NULL;
> +	}
> +
> +	/* possible_crtc's will be filled in later by crtc_init */
> +	ret = drm_universal_plane_init(dev, primary, 0,
> +				       &fsl_dcu_drm_plane_funcs,
> +				       fsl_dcu_drm_plane_formats,
> +				       ARRAY_SIZE(fsl_dcu_drm_plane_formats),
> +				       DRM_PLANE_TYPE_PRIMARY);
> +	if (ret) {
> +		kfree(primary);
> +		primary = NULL;
> +	}
> +	drm_plane_helper_add(primary, &fsl_dcu_drm_plane_helper_funcs);
> +
> +	return primary;
> +}
> diff --git a/drivers/gpu/drm/fsl/fsl_dcu_drm_plane.h
> b/drivers/gpu/drm/fsl/fsl_dcu_drm_plane.h
> new file mode 100644
> index 0000000..ccbfa61
> --- /dev/null
> +++ b/drivers/gpu/drm/fsl/fsl_dcu_drm_plane.h
> @@ -0,0 +1,23 @@
> +/*
> + * Copyright 2015 Freescale Semiconductor, Inc.
> + *
> + * Freescale DCU drm device driver
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + */
> +
> +#ifndef __FSL_DCU_DRM_PLANE_H__
> +#define __FSL_DCU_DRM_PLANE_H__
> +
> +struct fsl_dcu_drm_device;
> +struct fsl_dcu_drm_plane {
> +	struct drm_plane plane;
> +	unsigned int index;
> +};
> +
> +struct drm_plane *fsl_dcu_drm_primary_create_plane(struct drm_device *dev);
> +
> +#endif /* __FSL_DCU_DRM_PLANE_H__ */