From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@kernel.org>
X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on
	aws-us-west-2-korg-lkml-1.web.codeaurora.org
X-Spam-Level: 
X-Spam-Status: No, score=-12.9 required=3.0 tests=BAYES_00,DKIM_SIGNED,
	DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM,
	HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH,
	MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNWANTED_LANGUAGE_BODY,
	URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0
Received: from mail.kernel.org (mail.kernel.org [198.145.29.99])
	by smtp.lore.kernel.org (Postfix) with ESMTP id B4E8BC63777
	for <linux-kernel@archiver.kernel.org>; Mon, 30 Nov 2020 06:26:12 +0000 (UTC)
Received: from vger.kernel.org (vger.kernel.org [23.128.96.18])
	by mail.kernel.org (Postfix) with ESMTP id 54FDA20643
	for <linux-kernel@archiver.kernel.org>; Mon, 30 Nov 2020 06:26:12 +0000 (UTC)
Authentication-Results: mail.kernel.org;
	dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="A7GdB+Xm"
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1726962AbgK3GZr (ORCPT
        <rfc822;linux-kernel@archiver.kernel.org>);
        Mon, 30 Nov 2020 01:25:47 -0500
Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57272 "EHLO
        lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1726011AbgK3GZq (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Mon, 30 Nov 2020 01:25:46 -0500
Received: from mail-wm1-x343.google.com (mail-wm1-x343.google.com [IPv6:2a00:1450:4864:20::343])
        by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2977EC0613D3
        for <linux-kernel@vger.kernel.org>; Sun, 29 Nov 2020 22:25:06 -0800 (PST)
Received: by mail-wm1-x343.google.com with SMTP id h21so22708612wmb.2
        for <linux-kernel@vger.kernel.org>; Sun, 29 Nov 2020 22:25:06 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20161025;
        h=from:to:cc:subject:date:message-id:in-reply-to:references
         :mime-version:content-transfer-encoding;
        bh=TxMFwICoqSoDfQzs3jsqy5jI9KXugvjuOIUzoSPn7sw=;
        b=A7GdB+XmGvEzsBqjN4TuDQ4BAz4McGHtf9o14xUS9Lo9pOxRzd6JBsMCX+EZ0PEegd
         McAE52SdaPDlU8YaJA7PTexgknlWHd5kwc8uVDbec+rUNWEoIPpWb7UVMtyuqmPbxDAZ
         zAv1Ghphvl7iyl6SmKFKFmGfBy2vp/SI2D+qBQcxuhFbFc0VqAWj8OTWsu2CEqtcQ/7Q
         jL1wfBIdYWJb6HQJHy5gpY4LxGfF9M6TANvR23TlBNNTztwAD6vvGrrB5/a/SzUZegO5
         4sK/0fvtIiw91p+1ofVtpEM8lAwMJKJxwwx+usri7891VlyrFT4FLjtTyZIMycPHZF/b
         a/dQ==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=1e100.net; s=20161025;
        h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to
         :references:mime-version:content-transfer-encoding;
        bh=TxMFwICoqSoDfQzs3jsqy5jI9KXugvjuOIUzoSPn7sw=;
        b=YFpkRt26HGLllSzM6bKUJgAdT80KO67LpaIWh8SsqnYuLrCdqObINmadds7UZVur2T
         Zg9/3MoAR/hD8A92/2EiNuaw4/yBlOpQu4kT6sYlj7Q4jt2ZItPQ1h+sOzLdFs/v4kzN
         ioGv7qQE9V7/T1zEW74tZsn6lq8CUzvieIXy/oIlpzm2nPrU8VLaozkRuU3XD7yEovs9
         GU2TJBOUnSv8/dd7JXDTq0CI2i2+e3K5Wue7V2QoYka4t4BK3JlM7VC4o9gCCHkToVaY
         ixIgyvQ4nBtAohu/t76+Gq2Sw+qv/+Xr6BmdNsIYMJMhDXPUZmA/2WKqQIeu19RkVdo4
         mgPQ==
X-Gm-Message-State: AOAM533bf39+ZAMNxwF9bI5KvlaMc72uqMcoEi99PJ40/8RGa3Wpx7sz
        E6h4Mo2478dsIXxI6afHZEjq942Jl8YQew==
X-Google-Smtp-Source: ABdhPJwsaUtx3oZEoda71t6ADAtaO2e6AlTmsPUVWfRVODhkEePUvL9VTefw5IXXFIaeoUVK8DMzHw==
X-Received: by 2002:a7b:c145:: with SMTP id z5mr21371777wmi.164.1606717504463;
        Sun, 29 Nov 2020 22:25:04 -0800 (PST)
Received: from rum-mikhail-dt.world.mentorg.com (nat-rum.mentorg.com. [139.181.33.34])
        by smtp.gmail.com with ESMTPSA id u129sm22594649wme.9.2020.11.29.22.25.02
        (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128);
        Sun, 29 Nov 2020 22:25:04 -0800 (PST)
From:   mdurnev@gmail.com
X-Google-Original-From: mikhail_durnev@mentor.com
To:     linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
        noralf@tronnes.org
Cc:     mikhail_durnev@mentor.com
Subject: [PATCH v1 2/3] drm/tiny: Add driver for ili9341 with parallel bus
Date:   Mon, 30 Nov 2020 16:23:58 +1000
Message-Id: <1606717439-18383-3-git-send-email-mikhail_durnev@mentor.com>
X-Mailer: git-send-email 2.7.4
In-Reply-To: <1606717439-18383-1-git-send-email-mikhail_durnev@mentor.com>
References: <1606717439-18383-1-git-send-email-mikhail_durnev@mentor.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

From: Mikhail Durnev <mikhail_durnev@mentor.com>

MRB2801 display module [1] is an example of ILI9341 display that connects to
Intel 8080 parallel bus. Its connector is compatible with the ALIENTEK STM32
development board.

It can be used with the drm/mipi-dbi bus driver if the bus is emulated with
GPIO.

[1] http://www.lcdwiki.com/2.8inch_16BIT_Module_ILI9341_SKU:MRB2801

Signed-off-by: Mikhail Durnev <mikhail_durnev@mentor.com>
---
 drivers/gpu/drm/tiny/Kconfig        |  13 ++
 drivers/gpu/drm/tiny/Makefile       |   1 +
 drivers/gpu/drm/tiny/ili9341_gpio.c | 290 ++++++++++++++++++++++++++++++++++++
 3 files changed, 304 insertions(+)
 create mode 100644 drivers/gpu/drm/tiny/ili9341_gpio.c

diff --git a/drivers/gpu/drm/tiny/Kconfig b/drivers/gpu/drm/tiny/Kconfig
index 2b6414f..e48e268 100644
--- a/drivers/gpu/drm/tiny/Kconfig
+++ b/drivers/gpu/drm/tiny/Kconfig
@@ -66,6 +66,19 @@ config TINYDRM_ILI9341
 
 	  If M is selected the module will be called ili9341.
 
+config TINYDRM_ILI9341_GPIO
+	tristate "DRM support for ILI9341 display panels with parallel bus interface over GPIO"
+	depends on DRM
+	select DRM_KMS_HELPER
+	select DRM_KMS_CMA_HELPER
+	select DRM_MIPI_DBI
+	select BACKLIGHT_CLASS_DEVICE
+	help
+	  DRM driver for the following Ilitek ILI9341 panels:
+	  * MRB2801 2.8" 240x320 TFT
+
+	  If M is selected the module will be called ili9341_gpio.
+
 config TINYDRM_ILI9486
 	tristate "DRM support for ILI9486 display panels"
 	depends on DRM && SPI
diff --git a/drivers/gpu/drm/tiny/Makefile b/drivers/gpu/drm/tiny/Makefile
index 6ae4e9e5..1ad2c0d 100644
--- a/drivers/gpu/drm/tiny/Makefile
+++ b/drivers/gpu/drm/tiny/Makefile
@@ -5,6 +5,7 @@ obj-$(CONFIG_DRM_GM12U320)		+= gm12u320.o
 obj-$(CONFIG_TINYDRM_HX8357D)		+= hx8357d.o
 obj-$(CONFIG_TINYDRM_ILI9225)		+= ili9225.o
 obj-$(CONFIG_TINYDRM_ILI9341)		+= ili9341.o
+obj-$(CONFIG_TINYDRM_ILI9341_GPIO)	+= ili9341_gpio.o
 obj-$(CONFIG_TINYDRM_ILI9486)		+= ili9486.o
 obj-$(CONFIG_TINYDRM_MI0283QT)		+= mi0283qt.o
 obj-$(CONFIG_TINYDRM_REPAPER)		+= repaper.o
diff --git a/drivers/gpu/drm/tiny/ili9341_gpio.c b/drivers/gpu/drm/tiny/ili9341_gpio.c
new file mode 100644
index 0000000..de8a63b8
--- /dev/null
+++ b/drivers/gpu/drm/tiny/ili9341_gpio.c
@@ -0,0 +1,290 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * DRM driver for Ilitek ILI9341 panels with parallel bus interface
+ *
+ * Copyright 2020 Mikhail Durnev <mikhail_durnev@mentor.com>
+ *
+ * Based on ili9341.c:
+ * Copyright 2018 David Lechner <david@lechnology.com>
+ *
+ * Based on mi0283qt.c:
+ * Copyright 2016 Noralf Trønnes
+ */
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_mipi_dbi.h>
+#include <drm/drm_modeset_helper.h>
+#include <video/mipi_display.h>
+
+#define ILI9341_FRMCTR1		0xb1
+#define ILI9341_DISCTRL		0xb6
+#define ILI9341_ETMOD		0xb7
+
+#define ILI9341_PWCTRL1		0xc0
+#define ILI9341_PWCTRL2		0xc1
+#define ILI9341_VMCTRL1		0xc5
+#define ILI9341_VMCTRL2		0xc7
+#define ILI9341_PWCTRLA		0xcb
+#define ILI9341_PWCTRLB		0xcf
+
+#define ILI9341_PGAMCTRL	0xe0
+#define ILI9341_NGAMCTRL	0xe1
+#define ILI9341_DTCTRLA		0xe8
+#define ILI9341_DTCTRLB		0xea
+#define ILI9341_PWRSEQ		0xed
+
+#define ILI9341_EN3GAM		0xf2
+#define ILI9341_PUMPCTRL	0xf7
+
+#define ILI9341_MADCTL_BGR	BIT(3)
+#define ILI9341_MADCTL_MV	BIT(5)
+#define ILI9341_MADCTL_MX	BIT(6)
+#define ILI9341_MADCTL_MY	BIT(7)
+
+static void yx240qv29_enable(struct drm_simple_display_pipe *pipe,
+			     struct drm_crtc_state *crtc_state,
+			     struct drm_plane_state *plane_state)
+{
+	struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
+	struct mipi_dbi *dbi = &dbidev->dbi;
+	u8 addr_mode;
+	int ret, idx;
+
+	if (!drm_dev_enter(pipe->crtc.dev, &idx))
+		return;
+
+	DRM_DEBUG_KMS("\n");
+
+	ret = mipi_dbi_poweron_conditional_reset(dbidev);
+	if (ret < 0)
+		goto out_exit;
+	if (ret == 1)
+		goto out_enable;
+
+	mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_OFF);
+
+	mipi_dbi_command(dbi, ILI9341_PWCTRLB, 0x00, 0xc1, 0x30);
+	mipi_dbi_command(dbi, ILI9341_PWRSEQ, 0x64, 0x03, 0x12, 0x81);
+	mipi_dbi_command(dbi, ILI9341_DTCTRLA, 0x85, 0x00, 0x78);
+	mipi_dbi_command(dbi, ILI9341_PWCTRLA, 0x39, 0x2c, 0x00, 0x34, 0x02);
+	mipi_dbi_command(dbi, ILI9341_PUMPCTRL, 0x20);
+	mipi_dbi_command(dbi, ILI9341_DTCTRLB, 0x00, 0x00);
+
+	/* Power Control */
+	mipi_dbi_command(dbi, ILI9341_PWCTRL1, 0x23);
+	mipi_dbi_command(dbi, ILI9341_PWCTRL2, 0x10);
+	/* VCOM */
+	mipi_dbi_command(dbi, ILI9341_VMCTRL1, 0x3e, 0x28);
+	mipi_dbi_command(dbi, ILI9341_VMCTRL2, 0x86);
+
+	/* Memory Access Control */
+	mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT, MIPI_DCS_PIXEL_FMT_16BIT);
+
+	/* Frame Rate */
+	mipi_dbi_command(dbi, ILI9341_FRMCTR1, 0x00, 0x1b);
+
+	/* Gamma */
+	mipi_dbi_command(dbi, ILI9341_EN3GAM, 0x00);
+	mipi_dbi_command(dbi, MIPI_DCS_SET_GAMMA_CURVE, 0x01);
+	mipi_dbi_command(dbi, ILI9341_PGAMCTRL,
+			 0x0f, 0x31, 0x2b, 0x0c, 0x0e, 0x08, 0x4e, 0xf1,
+			 0x37, 0x07, 0x10, 0x03, 0x0e, 0x09, 0x00);
+	mipi_dbi_command(dbi, ILI9341_NGAMCTRL,
+			 0x00, 0x0e, 0x14, 0x03, 0x11, 0x07, 0x31, 0xc1,
+			 0x48, 0x08, 0x0f, 0x0c, 0x31, 0x36, 0x0f);
+
+	/* DDRAM */
+	mipi_dbi_command(dbi, ILI9341_ETMOD, 0x07);
+
+	/* Display */
+	mipi_dbi_command(dbi, ILI9341_DISCTRL, 0x08, 0x82, 0x27, 0x00);
+	mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
+	msleep(100);
+
+	mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
+	msleep(100);
+
+out_enable:
+	switch (dbidev->rotation) {
+	default:
+		addr_mode = ILI9341_MADCTL_MX;
+		break;
+	case 90:
+		addr_mode = ILI9341_MADCTL_MV;
+		break;
+	case 180:
+		addr_mode = ILI9341_MADCTL_MY;
+		break;
+	case 270:
+		addr_mode = ILI9341_MADCTL_MV | ILI9341_MADCTL_MY |
+			    ILI9341_MADCTL_MX;
+		break;
+	}
+	addr_mode |= ILI9341_MADCTL_BGR;
+	mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
+	mipi_dbi_enable_flush(dbidev, crtc_state, plane_state);
+out_exit:
+	drm_dev_exit(idx);
+}
+
+static const struct drm_simple_display_pipe_funcs ili9341gpio_pipe_funcs = {
+	.enable = yx240qv29_enable,
+	.disable = mipi_dbi_pipe_disable,
+	.update = mipi_dbi_pipe_update,
+	.prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb,
+};
+
+static const struct drm_display_mode yx240qv29_mode = {
+	DRM_SIMPLE_MODE(240, 320, 37, 49),
+};
+
+DEFINE_DRM_GEM_CMA_FOPS(ili9341gpio_fops);
+
+static struct drm_driver ili9341gpio_driver = {
+	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
+	.fops			= &ili9341gpio_fops,
+	.release		= mipi_dbi_release,
+	DRM_GEM_CMA_VMAP_DRIVER_OPS,
+	.debugfs_init		= mipi_dbi_debugfs_init,
+	.name			= "ili9341gpio",
+	.desc			= "Ilitek ILI9341",
+	.date			= "20201114",
+	.major			= 1,
+	.minor			= 0,
+};
+
+static const struct of_device_id ili9341gpio_of_match[] = {
+	{ .compatible = "ronbo,mrb2801" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ili9341gpio_of_match);
+
+static int ili9341gpio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct mipi_dbi_dev *dbidev;
+	struct drm_device *drm;
+	struct mipi_dbi *dbi;
+	struct gpio_desc *dc;
+	struct gpio_desc *wr;
+	struct gpio_descs *db;
+	u32 rotation = 0;
+	u32 wr_delays[2] = {15, 60};
+	int ret;
+
+	dbidev = kzalloc(sizeof(*dbidev), GFP_KERNEL);
+	if (!dbidev)
+		return -ENOMEM;
+
+	dbi = &dbidev->dbi;
+	drm = &dbidev->drm;
+	ret = devm_drm_dev_init(dev, drm, &ili9341gpio_driver);
+	if (ret) {
+		kfree(dbidev);
+		return ret;
+	}
+
+	drm_mode_config_init(drm);
+
+	dbi->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(dbi->reset)) {
+		DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
+		return PTR_ERR(dbi->reset);
+	}
+
+	dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_HIGH);
+	if (IS_ERR(dc)) {
+		DRM_DEV_ERROR(dev, "Failed to get gpio 'dc'\n");
+		return PTR_ERR(dc);
+	}
+
+	wr = devm_gpiod_get(dev, "wr", GPIOD_OUT_HIGH);
+	if (IS_ERR(wr)) {
+		DRM_DEV_ERROR(dev, "Failed to get gpio 'wr'\n");
+		return PTR_ERR(wr);
+	}
+
+	db = devm_gpiod_get_array(dev, "db", GPIOD_OUT_LOW);
+	if (IS_ERR(db)) {
+		DRM_DEV_ERROR(dev, "Failed to get gpio 'db'\n");
+		return PTR_ERR(db);
+	}
+	if (db->ndescs != 16 && db->ndescs != 8) {
+		/*
+		 * The data bus can be either 8 or 16 bits wide.
+		 * ILI9341 can work with 6, 8, 9, 16, and 18-bit parallel interfaces,
+		 * but the MRB2801 board supports only 8 or 16-bit interfaces.
+		 */
+		DRM_DEV_ERROR(dev, "Wrong number of bits in gpio 'db': %u\n", db->ndescs);
+		return PTR_ERR(db);
+	}
+
+	dbidev->backlight = devm_of_find_backlight(dev);
+	if (IS_ERR(dbidev->backlight))
+		return PTR_ERR(dbidev->backlight);
+
+	device_property_read_u32(dev, "rotation", &rotation);
+
+	device_property_read_u32_array(dev, "wr-up-down-delays", wr_delays, 2);
+
+	ret = mipi_dbi_gpio_init(dbi, dc, wr, db, wr_delays[0], wr_delays[1]);
+	if (ret)
+		return ret;
+
+	ret = mipi_dbi_dev_init(dbidev, &ili9341gpio_pipe_funcs, &yx240qv29_mode, rotation);
+	if (ret)
+		return ret;
+
+	drm_mode_config_reset(drm);
+
+	ret = drm_dev_register(drm, 0);
+	if (ret)
+		return ret;
+
+	platform_set_drvdata(pdev, drm);
+
+	drm_fbdev_generic_setup(drm, 0);
+
+	return 0;
+}
+
+static int ili9341gpio_remove(struct platform_device *pdev)
+{
+	struct drm_device *drm = platform_get_drvdata(pdev);
+
+	drm_dev_unplug(drm);
+	drm_atomic_helper_shutdown(drm);
+
+	return 0;
+}
+
+static void ili9341gpio_shutdown(struct platform_device *pdev)
+{
+	drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
+}
+
+static struct platform_driver ili9341gpio_platform_driver = {
+	.driver = {
+		.name = "ili9341gpio",
+		.of_match_table = ili9341gpio_of_match,
+	},
+	.probe = ili9341gpio_probe,
+	.remove = ili9341gpio_remove,
+	.shutdown = ili9341gpio_shutdown,
+};
+module_platform_driver(ili9341gpio_platform_driver);
+
+MODULE_DESCRIPTION("Ilitek ILI9341 8/16-bit DRM driver");
+MODULE_AUTHOR("Mikhail Durnev <mikhail_durnev@mentor.com>");
+MODULE_LICENSE("GPL");
-- 
2.7.4