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Subject: Re: [PATCH v4 3/5] drm/tinydrm: add support for LEGO MINDSTORMS EV3
 LCD
From: =?UTF-8?Q?Noralf_Tr=c3=b8nnes?= <noralf@tronnes.org>
To: David Lechner <david@lechnology.com>, dri-devel@lists.freedesktop.org,
        devicetree@vger.kernel.org
Cc: Mark Rutland <mark.rutland@arm.com>, Kevin Hilman <khilman@kernel.org>,
        Sekhar Nori <nsekhar@ti.com>, linux-kernel@vger.kernel.org,
        Rob Herring <robh+dt@kernel.org>,
        Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
        linux-arm-kernel@lists.infradead.org
References: <1502127581-10517-1-git-send-email-david@lechnology.com>
 <1502127581-10517-4-git-send-email-david@lechnology.com>
 <c31699ba-91bb-96f1-c18d-ce36fb7abf49@tronnes.org>
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Date: Fri, 11 Aug 2017 18:40:41 +0200
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Den 09.08.2017 19.59, skrev Noralf Trønnes:
>
> Den 07.08.2017 19.39, skrev David Lechner:
>> LEGO MINDSTORMS EV3 has an LCD with a ST7586 controller. This adds a new
>> module for the ST7586 controller with parameters for the LEGO MINDSTORMS
>> EV3 LCD display.
>>
>> Signed-off-by: David Lechner <david@lechnology.com>
>> ---
>
> This looks good, even I understand the pixel packing now :-)
> Now we wait for the DT maintainers to have their say.
>
> Reviewed-by: Noralf Trønnes <noralf@tronnes.org>
>

Thanks, applied to drm-misc together with dt binding.

Noralf.

>> v4 changes:
>> * correct order for MAINTAINERS entry
>> * Drop code not used by LEGO EV3 (regulator, backlight, suspend/resume)
>> * Make gpios required
>> * Use lookup table for pixel packing algorithm
>> * Don't modify clip when used as function parameter
>> * Use roundup/rounddown macros
>>
>>
>>   MAINTAINERS                      |   6 +
>>   drivers/gpu/drm/tinydrm/Kconfig  |  10 +
>>   drivers/gpu/drm/tinydrm/Makefile |   1 +
>>   drivers/gpu/drm/tinydrm/st7586.c | 428 
>> +++++++++++++++++++++++++++++++++++++++
>>   4 files changed, 445 insertions(+)
>>   create mode 100644 drivers/gpu/drm/tinydrm/st7586.c
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index a1e772e..19ca3e6 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -4380,6 +4380,12 @@ S:    Orphan / Obsolete
>>   F:    drivers/gpu/drm/sis/
>>   F:    include/uapi/drm/sis_drm.h
>>   +DRM DRIVER FOR SITRONIX ST7586 PANELS
>> +M:    David Lechner <david@lechnology.com>
>> +S:    Maintained
>> +F:    drivers/gpu/drm/tinydrm/st7586.c
>> +F:    Documentation/devicetree/bindings/display/st7586.txt
>> +
>>   DRM DRIVER FOR TDFX VIDEO CARDS
>>   S:    Orphan / Obsolete
>>   F:    drivers/gpu/drm/tdfx/
>> diff --git a/drivers/gpu/drm/tinydrm/Kconfig 
>> b/drivers/gpu/drm/tinydrm/Kconfig
>> index f17c3ca..2e790e7 100644
>> --- a/drivers/gpu/drm/tinydrm/Kconfig
>> +++ b/drivers/gpu/drm/tinydrm/Kconfig
>> @@ -32,3 +32,13 @@ config TINYDRM_REPAPER
>>         2.71" TFT EPD Panel (E2271CS021)
>>           If M is selected the module will be called repaper.
>> +
>> +config TINYDRM_ST7586
>> +    tristate "DRM support for Sitronix ST7586 display panels"
>> +    depends on DRM_TINYDRM && SPI
>> +    select TINYDRM_MIPI_DBI
>> +    help
>> +      DRM driver for the following Sitronix ST7586 panels:
>> +      * LEGO MINDSTORMS EV3
>> +
>> +      If M is selected the module will be called st7586.
>> diff --git a/drivers/gpu/drm/tinydrm/Makefile 
>> b/drivers/gpu/drm/tinydrm/Makefile
>> index 95bb4d4..0c184bd 100644
>> --- a/drivers/gpu/drm/tinydrm/Makefile
>> +++ b/drivers/gpu/drm/tinydrm/Makefile
>> @@ -6,3 +6,4 @@ obj-$(CONFIG_TINYDRM_MIPI_DBI)        += mipi-dbi.o
>>   # Displays
>>   obj-$(CONFIG_TINYDRM_MI0283QT)        += mi0283qt.o
>>   obj-$(CONFIG_TINYDRM_REPAPER)        += repaper.o
>> +obj-$(CONFIG_TINYDRM_ST7586)        += st7586.o
>> diff --git a/drivers/gpu/drm/tinydrm/st7586.c 
>> b/drivers/gpu/drm/tinydrm/st7586.c
>> new file mode 100644
>> index 0000000..1b39d3f
>> --- /dev/null
>> +++ b/drivers/gpu/drm/tinydrm/st7586.c
>> @@ -0,0 +1,428 @@
>> +/*
>> + * DRM driver for Sitronix ST7586 panels
>> + *
>> + * Copyright 2017 David Lechner <david@lechnology.com>
>> + *
>> + * 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/delay.h>
>> +#include <linux/dma-buf.h>
>> +#include <linux/gpio/consumer.h>
>> +#include <linux/module.h>
>> +#include <linux/property.h>
>> +#include <linux/spi/spi.h>
>> +#include <video/mipi_display.h>
>> +
>> +#include <drm/tinydrm/mipi-dbi.h>
>> +#include <drm/tinydrm/tinydrm-helpers.h>
>> +
>> +/* controller-specific commands */
>> +#define ST7586_DISP_MODE_GRAY    0x38
>> +#define ST7586_DISP_MODE_MONO    0x39
>> +#define ST7586_ENABLE_DDRAM    0x3a
>> +#define ST7586_SET_DISP_DUTY    0xb0
>> +#define ST7586_SET_PART_DISP    0xb4
>> +#define ST7586_SET_NLINE_INV    0xb5
>> +#define ST7586_SET_VOP        0xc0
>> +#define ST7586_SET_BIAS_SYSTEM    0xc3
>> +#define ST7586_SET_BOOST_LEVEL    0xc4
>> +#define ST7586_SET_VOP_OFFSET    0xc7
>> +#define ST7586_ENABLE_ANALOG    0xd0
>> +#define ST7586_AUTO_READ_CTRL    0xd7
>> +#define ST7586_OTP_RW_CTRL    0xe0
>> +#define ST7586_OTP_CTRL_OUT    0xe1
>> +#define ST7586_OTP_READ        0xe3
>> +
>> +#define ST7586_DISP_CTRL_MX    BIT(6)
>> +#define ST7586_DISP_CTRL_MY    BIT(7)
>> +
>> +/*
>> + * The ST7586 controller has an unusual pixel format where 2bpp 
>> grayscale is
>> + * packed 3 pixels per byte with the first two pixels using 3 bits 
>> and the 3rd
>> + * pixel using only 2 bits.
>> + *
>> + * |  D7  |  D6  |  D5  ||      |      || 2bpp |
>> + * | (D4) | (D3) | (D2) ||  D1  |  D0  || GRAY |
>> + * +------+------+------++------+------++------+
>> + * |  1   |  1   |  1   ||  1   |  1   || 0  0 | black
>> + * |  1   |  0   |  0   ||  1   |  0   || 0  1 | dark gray
>> + * |  0   |  1   |  0   ||  0   |  1   || 1  0 | light gray
>> + * |  0   |  0   |  0   ||  0   |  0   || 1  1 | white
>> + */
>> +
>> +static const u8 st7586_lookup[] = { 0x7, 0x4, 0x2, 0x0 };
>> +
>> +static void st7586_xrgb8888_to_gray332(u8 *dst, void *vaddr,
>> +                       struct drm_framebuffer *fb,
>> +                       struct drm_clip_rect *clip)
>> +{
>> +    size_t len = (clip->x2 - clip->x1) * (clip->y2 - clip->y1);
>> +    unsigned int x, y;
>> +    u8 *src, *buf, val;
>> +
>> +    buf = kmalloc(len, GFP_KERNEL);
>> +    if (!buf)
>> +        return;
>> +
>> +    tinydrm_xrgb8888_to_gray8(buf, vaddr, fb, clip);
>> +    src = buf;
>> +
>> +    for (y = clip->y1; y < clip->y2; y++) {
>> +        for (x = clip->x1; x < clip->x2; x += 3) {
>> +            val = st7586_lookup[*src++ >> 6] << 5;
>> +            val |= st7586_lookup[*src++ >> 6] << 2;
>> +            val |= st7586_lookup[*src++ >> 6] >> 1;
>> +            *dst++ = val;
>> +        }
>> +    }
>> +
>> +    kfree(buf);
>> +}
>> +
>> +static int st7586_buf_copy(void *dst, struct drm_framebuffer *fb,
>> +               struct drm_clip_rect *clip)
>> +{
>> +    struct drm_gem_cma_object *cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
>> +    struct dma_buf_attachment *import_attach = 
>> cma_obj->base.import_attach;
>> +    void *src = cma_obj->vaddr;
>> +    int ret = 0;
>> +
>> +    if (import_attach) {
>> +        ret = dma_buf_begin_cpu_access(import_attach->dmabuf,
>> +                           DMA_FROM_DEVICE);
>> +        if (ret)
>> +            return ret;
>> +    }
>> +
>> +    st7586_xrgb8888_to_gray332(dst, src, fb, clip);
>> +
>> +    if (import_attach)
>> +        ret = dma_buf_end_cpu_access(import_attach->dmabuf,
>> +                         DMA_FROM_DEVICE);
>> +
>> +    return ret;
>> +}
>> +
>> +static int st7586_fb_dirty(struct drm_framebuffer *fb,
>> +               struct drm_file *file_priv, unsigned int flags,
>> +               unsigned int color, struct drm_clip_rect *clips,
>> +               unsigned int num_clips)
>> +{
>> +    struct tinydrm_device *tdev = fb->dev->dev_private;
>> +    struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);
>> +    struct drm_clip_rect clip;
>> +    int start, end;
>> +    int ret = 0;
>> +
>> +    mutex_lock(&tdev->dirty_lock);
>> +
>> +    if (!mipi->enabled)
>> +        goto out_unlock;
>> +
>> +    /* fbdev can flush even when we're not interested */
>> +    if (tdev->pipe.plane.fb != fb)
>> +        goto out_unlock;
>> +
>> +    tinydrm_merge_clips(&clip, clips, num_clips, flags, fb->width,
>> +                fb->height);
>> +
>> +    /* 3 pixels per byte, so grow clip to nearest multiple of 3 */
>> +    clip.x1 = rounddown(clip.x1, 3);
>> +    clip.x2 = roundup(clip.x2, 3);
>> +
>> +    DRM_DEBUG("Flushing [FB:%d] x1=%u, x2=%u, y1=%u, y2=%u\n", 
>> fb->base.id,
>> +          clip.x1, clip.x2, clip.y1, clip.y2);
>> +
>> +    ret = st7586_buf_copy(mipi->tx_buf, fb, &clip);
>> +    if (ret)
>> +        goto out_unlock;
>> +
>> +    /* Pixels are packed 3 per byte */
>> +    start = clip.x1 / 3;
>> +    end = clip.x2 / 3;
>> +
>> +    mipi_dbi_command(mipi, MIPI_DCS_SET_COLUMN_ADDRESS,
>> +             (start >> 8) & 0xFF, start & 0xFF,
>> +             (end >> 8) & 0xFF, (end - 1) & 0xFF);
>> +    mipi_dbi_command(mipi, MIPI_DCS_SET_PAGE_ADDRESS,
>> +             (clip.y1 >> 8) & 0xFF, clip.y1 & 0xFF,
>> +             (clip.y2 >> 8) & 0xFF, (clip.y2 - 1) & 0xFF);
>> +
>> +    ret = mipi_dbi_command_buf(mipi, MIPI_DCS_WRITE_MEMORY_START,
>> +                   (u8 *)mipi->tx_buf,
>> +                   (end - start) * (clip.y2 - clip.y1));
>> +
>> +out_unlock:
>> +    mutex_unlock(&tdev->dirty_lock);
>> +
>> +    if (ret)
>> +        dev_err_once(fb->dev->dev, "Failed to update display %d\n",
>> +                 ret);
>> +
>> +    return ret;
>> +}
>> +
>> +static const struct drm_framebuffer_funcs st7586_fb_funcs = {
>> +    .destroy    = drm_fb_cma_destroy,
>> +    .create_handle    = drm_fb_cma_create_handle,
>> +    .dirty        = st7586_fb_dirty,
>> +};
>> +
>> +void st7586_pipe_enable(struct drm_simple_display_pipe *pipe,
>> +            struct drm_crtc_state *crtc_state)
>> +{
>> +    struct tinydrm_device *tdev = pipe_to_tinydrm(pipe);
>> +    struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);
>> +    struct drm_framebuffer *fb = pipe->plane.fb;
>> +    struct device *dev = tdev->drm->dev;
>> +    int ret;
>> +    u8 addr_mode;
>> +
>> +    DRM_DEBUG_KMS("\n");
>> +
>> +    mipi_dbi_hw_reset(mipi);
>> +    ret = mipi_dbi_command(mipi, ST7586_AUTO_READ_CTRL, 0x9f);
>> +    if (ret) {
>> +        dev_err(dev, "Error sending command %d\n", ret);
>> +        return;
>> +    }
>> +
>> +    mipi_dbi_command(mipi, ST7586_OTP_RW_CTRL, 0x00);
>> +
>> +    msleep(10);
>> +
>> +    mipi_dbi_command(mipi, ST7586_OTP_READ);
>> +
>> +    msleep(20);
>> +
>> +    mipi_dbi_command(mipi, ST7586_OTP_CTRL_OUT);
>> +    mipi_dbi_command(mipi, MIPI_DCS_EXIT_SLEEP_MODE);
>> +    mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_OFF);
>> +
>> +    msleep(50);
>> +
>> +    mipi_dbi_command(mipi, ST7586_SET_VOP_OFFSET, 0x00);
>> +    mipi_dbi_command(mipi, ST7586_SET_VOP, 0xe3, 0x00);
>> +    mipi_dbi_command(mipi, ST7586_SET_BIAS_SYSTEM, 0x02);
>> +    mipi_dbi_command(mipi, ST7586_SET_BOOST_LEVEL, 0x04);
>> +    mipi_dbi_command(mipi, ST7586_ENABLE_ANALOG, 0x1d);
>> +    mipi_dbi_command(mipi, ST7586_SET_NLINE_INV, 0x00);
>> +    mipi_dbi_command(mipi, ST7586_DISP_MODE_GRAY);
>> +    mipi_dbi_command(mipi, ST7586_ENABLE_DDRAM, 0x02);
>> +
>> +    switch (mipi->rotation) {
>> +    default:
>> +        addr_mode = 0x00;
>> +        break;
>> +    case 90:
>> +        addr_mode = ST7586_DISP_CTRL_MY;
>> +        break;
>> +    case 180:
>> +        addr_mode = ST7586_DISP_CTRL_MX | ST7586_DISP_CTRL_MY;
>> +        break;
>> +    case 270:
>> +        addr_mode = ST7586_DISP_CTRL_MX;
>> +        break;
>> +    }
>> +    mipi_dbi_command(mipi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
>> +
>> +    mipi_dbi_command(mipi, ST7586_SET_DISP_DUTY, 0x7f);
>> +    mipi_dbi_command(mipi, ST7586_SET_PART_DISP, 0xa0);
>> +    mipi_dbi_command(mipi, MIPI_DCS_SET_PARTIAL_AREA, 0x00, 0x00, 
>> 0x00, 0x77);
>> +    mipi_dbi_command(mipi, MIPI_DCS_EXIT_INVERT_MODE);
>> +
>> +    msleep(100);
>> +
>> +    mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_ON);
>> +
>> +    mipi->enabled = true;
>> +
>> +    if (fb)
>> +        fb->funcs->dirty(fb, NULL, 0, 0, NULL, 0);
>> +}
>> +
>> +static void st7586_pipe_disable(struct drm_simple_display_pipe *pipe)
>> +{
>> +    struct tinydrm_device *tdev = pipe_to_tinydrm(pipe);
>> +    struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);
>> +
>> +    DRM_DEBUG_KMS("\n");
>> +
>> +    if (!mipi->enabled)
>> +        return;
>> +
>> +    mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_OFF);
>> +    mipi->enabled = false;
>> +}
>> +
>> +static const u32 st7586_formats[] = {
>> +    DRM_FORMAT_XRGB8888,
>> +};
>> +
>> +static int st7586_init(struct device *dev, struct mipi_dbi *mipi,
>> +        const struct drm_simple_display_pipe_funcs *pipe_funcs,
>> +        struct drm_driver *driver, const struct drm_display_mode *mode,
>> +        unsigned int rotation)
>> +{
>> +    size_t bufsize = (mode->vdisplay + 2) / 3 * mode->hdisplay;
>> +    struct tinydrm_device *tdev = &mipi->tinydrm;
>> +    int ret;
>> +
>> +    mutex_init(&mipi->cmdlock);
>> +
>> +    mipi->tx_buf = devm_kmalloc(dev, bufsize, GFP_KERNEL);
>> +    if (!mipi->tx_buf)
>> +        return -ENOMEM;
>> +
>> +    ret = devm_tinydrm_init(dev, tdev, &st7586_fb_funcs, driver);
>> +    if (ret)
>> +        return ret;
>> +
>> +    ret = tinydrm_display_pipe_init(tdev, pipe_funcs,
>> +                    DRM_MODE_CONNECTOR_VIRTUAL,
>> +                    st7586_formats,
>> +                    ARRAY_SIZE(st7586_formats),
>> +                    mode, rotation);
>> +    if (ret)
>> +        return ret;
>> +
>> +    tdev->drm->mode_config.preferred_depth = 32;
>> +    mipi->rotation = rotation;
>> +
>> +    drm_mode_config_reset(tdev->drm);
>> +
>> +    DRM_DEBUG_KMS("preferred_depth=%u, rotation = %u\n",
>> +              tdev->drm->mode_config.preferred_depth, rotation);
>> +
>> +    return 0;
>> +}
>> +
>> +static const struct drm_simple_display_pipe_funcs st7586_pipe_funcs = {
>> +    .enable        = st7586_pipe_enable,
>> +    .disable    = st7586_pipe_disable,
>> +    .update        = tinydrm_display_pipe_update,
>> +    .prepare_fb    = tinydrm_display_pipe_prepare_fb,
>> +};
>> +
>> +static const struct drm_display_mode st7586_mode = {
>> +    TINYDRM_MODE(178, 128, 37, 27),
>> +};
>> +
>> +DEFINE_DRM_GEM_CMA_FOPS(st7586_fops);
>> +
>> +static struct drm_driver st7586_driver = {
>> +    .driver_features    = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME |
>> +                  DRIVER_ATOMIC,
>> +    .fops            = &st7586_fops,
>> +    TINYDRM_GEM_DRIVER_OPS,
>> +    .lastclose        = tinydrm_lastclose,
>> +    .debugfs_init        = mipi_dbi_debugfs_init,
>> +    .name            = "st7586",
>> +    .desc            = "Sitronix ST7586",
>> +    .date            = "20170801",
>> +    .major            = 1,
>> +    .minor            = 0,
>> +};
>> +
>> +static const struct of_device_id st7586_of_match[] = {
>> +    { .compatible = "lego,ev3-lcd" },
>> +    {},
>> +};
>> +MODULE_DEVICE_TABLE(of, st7586_of_match);
>> +
>> +static const struct spi_device_id st7586_id[] = {
>> +    { "ev3-lcd", 0 },
>> +    { },
>> +};
>> +MODULE_DEVICE_TABLE(spi, st7586_id);
>> +
>> +static int st7586_probe(struct spi_device *spi)
>> +{
>> +    struct device *dev = &spi->dev;
>> +    struct tinydrm_device *tdev;
>> +    struct mipi_dbi *mipi;
>> +    struct gpio_desc *a0;
>> +    u32 rotation = 0;
>> +    int ret;
>> +
>> +    mipi = devm_kzalloc(dev, sizeof(*mipi), GFP_KERNEL);
>> +    if (!mipi)
>> +        return -ENOMEM;
>> +
>> +    mipi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
>> +    if (IS_ERR(mipi->reset)) {
>> +        dev_err(dev, "Failed to get gpio 'reset'\n");
>> +        return PTR_ERR(mipi->reset);
>> +    }
>> +
>> +    a0 = devm_gpiod_get(dev, "a0", GPIOD_OUT_LOW);
>> +    if (IS_ERR(a0)) {
>> +        dev_err(dev, "Failed to get gpio 'a0'\n");
>> +        return PTR_ERR(a0);
>> +    }
>> +
>> +    device_property_read_u32(dev, "rotation", &rotation);
>> +
>> +    ret = mipi_dbi_spi_init(spi, mipi, a0);
>> +    if (ret)
>> +        return ret;
>> +
>> +    /* Cannot read from this controller via SPI */
>> +    mipi->read_commands = NULL;
>> +
>> +    /*
>> +     * we are using 8-bit data, so we are not actually swapping 
>> anything,
>> +     * but setting mipi->swap_bytes makes mipi_dbi_typec3_command() 
>> do the
>> +     * right thing and not use 16-bit transfers (which results in 
>> swapped
>> +     * bytes on little-endian systems and causes out of order data 
>> to be
>> +     * sent to the display).
>> +     */
>> +    mipi->swap_bytes = true;
>> +
>> +    ret = st7586_init(&spi->dev, mipi, &st7586_pipe_funcs, 
>> &st7586_driver,
>> +              &st7586_mode, rotation);
>> +    if (ret)
>> +        return ret;
>> +
>> +    tdev = &mipi->tinydrm;
>> +
>> +    ret = devm_tinydrm_register(tdev);
>> +    if (ret)
>> +        return ret;
>> +
>> +    spi_set_drvdata(spi, mipi);
>> +
>> +    DRM_DEBUG_DRIVER("Initialized %s:%s @%uMHz on minor %d\n",
>> +             tdev->drm->driver->name, dev_name(dev),
>> +             spi->max_speed_hz / 1000000,
>> +             tdev->drm->primary->index);
>> +
>> +    return 0;
>> +}
>> +
>> +static void st7586_shutdown(struct spi_device *spi)
>> +{
>> +    struct mipi_dbi *mipi = spi_get_drvdata(spi);
>> +
>> +    tinydrm_shutdown(&mipi->tinydrm);
>> +}
>> +
>> +static struct spi_driver st7586_spi_driver = {
>> +    .driver = {
>> +        .name = "st7586",
>> +        .owner = THIS_MODULE,
>> +        .of_match_table = st7586_of_match,
>> +    },
>> +    .id_table = st7586_id,
>> +    .probe = st7586_probe,
>> +    .shutdown = st7586_shutdown,
>> +};
>> +module_spi_driver(st7586_spi_driver);
>> +
>> +MODULE_DESCRIPTION("Sitronix ST7586 DRM driver");
>> +MODULE_AUTHOR("David Lechner <david@lechnology.com>");
>> +MODULE_LICENSE("GPL");
>
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