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SubjectRe: [PATCH v2 5/5] drm/tiny: panel-mipi-dbi: Support the pixel format property
On 12/05/2024 17:25, Noralf Trønnes via B4 Relay wrote:
> From: Noralf Trønnes <noralf@tronnes.org>
>
> Add support for these pixel format property values:
> - r5g6b5, RGB565
> - b6x2g6x2r6x2, BGR666
>
> BGR666 is presented to userspace as RGB888. The 2 LSB in each color
> are discarded by the controller. The pixel is sent on the wire using
> 8 bits per word (little endian) so the controller sees it as BGR.
>
> RGB565 is the default if the property is not present.
>
> Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
> ---
> drivers/gpu/drm/tiny/panel-mipi-dbi.c | 55 ++++++++++++++++++++++++++++++++++-
> 1 file changed, 54 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/tiny/panel-mipi-dbi.c b/drivers/gpu/drm/tiny/panel-mipi-dbi.c
> index f80a141fcf36..f3aa2abce314 100644
> --- a/drivers/gpu/drm/tiny/panel-mipi-dbi.c
> +++ b/drivers/gpu/drm/tiny/panel-mipi-dbi.c
> @@ -26,6 +26,49 @@
>
> #include <video/mipi_display.h>
>
> +struct panel_mipi_dbi_format {
> + const char *name;
> + u32 fourcc;
> + unsigned int bpp;
> +};
> +
> +static const struct panel_mipi_dbi_format panel_mipi_dbi_formats[] = {
> + { "r5g6b5", DRM_FORMAT_RGB565, 16 },
> + { "b6x2g6x2r6x2", DRM_FORMAT_RGB888, 24 },
> +};
> +
> +static int panel_mipi_dbi_get_format(struct device *dev, u32 *formats, unsigned int *bpp)
> +{
> + const char *format_name;
> + unsigned int i;
> + int ret;
> +
> + formats[1] = DRM_FORMAT_XRGB8888;
> +
> + ret = device_property_read_string(dev, "format", &format_name);
> + if (ret) {
> + /* Old Device Trees don't have this property */
> + formats[0] = DRM_FORMAT_RGB565;
> + *bpp = 16;
> + return 0;
> + }
> +
> + for (i = 0; i < ARRAY_SIZE(panel_mipi_dbi_formats); i++) {
> + const struct panel_mipi_dbi_format *format = &panel_mipi_dbi_formats[i];
> +
> + if (strcmp(format_name, format->name))
> + continue;
> +
> + formats[0] = format->fourcc;
> + *bpp = format->bpp;
> + return 0;
> + }
> +
> + dev_err(dev, "Pixel format is not supported: '%s'\n", format_name);
> +
> + return -EINVAL;
> +}
> +
> static const u8 panel_mipi_dbi_magic[15] = { 'M', 'I', 'P', 'I', ' ', 'D', 'B', 'I',
> 0, 0, 0, 0, 0, 0, 0 };
>
> @@ -276,6 +319,9 @@ static int panel_mipi_dbi_spi_probe(struct spi_device *spi)
> struct drm_device *drm;
> struct mipi_dbi *dbi;
> struct gpio_desc *dc;
> + unsigned int bpp;
> + size_t buf_size;
> + u32 formats[2];
> int ret;
>
> dbidev = devm_drm_dev_alloc(dev, &panel_mipi_dbi_driver, struct mipi_dbi_dev, drm);
> @@ -323,7 +369,14 @@ static int panel_mipi_dbi_spi_probe(struct spi_device *spi)
> if (IS_ERR(dbidev->driver_private))
> return PTR_ERR(dbidev->driver_private);
>
> - ret = mipi_dbi_dev_init(dbidev, &panel_mipi_dbi_pipe_funcs, &mode, 0);
> + ret = panel_mipi_dbi_get_format(dev, formats, &bpp);
> + if (ret)
> + return ret;
> +
> + buf_size = DIV_ROUND_UP(mode.hdisplay * mode.vdisplay * bpp, 8);
> + ret = mipi_dbi_dev_init_with_formats(dbidev, &panel_mipi_dbi_pipe_funcs,
> + formats, ARRAY_SIZE(formats),
> + &mode, 0, buf_size);
> if (ret)
> return ret;
>
>

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>

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