[PATCH v4 13/16] drm/dsi: Implement DCS {get, set}_pixel_format commands

[Sean Paul]

On Mon, Nov 3, 2014 at 4:13 AM, Thierry Reding <thierry.reding at gmail.com> wrote:
> From: Thierry Reding <treding at nvidia.com>
>
> Provide small convenience wrappers to query or set the pixel format used
> by the interface.
>
> Signed-off-by: Thierry Reding <treding at nvidia.com>
> ---
>  drivers/gpu/drm/drm_mipi_dsi.c | 42 ++++++++++++++++++++++++++++++++++++++++++
>  include/drm/drm_mipi_dsi.h     |  2 ++
>  2 files changed, 44 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
> index da34469b9b98..226822a44457 100644
> --- a/drivers/gpu/drm/drm_mipi_dsi.c
> +++ b/drivers/gpu/drm/drm_mipi_dsi.c
> @@ -553,6 +553,27 @@ int mipi_dsi_dcs_get_power_mode(struct mipi_dsi_device *dsi, u8 *mode)
>  EXPORT_SYMBOL(mipi_dsi_dcs_get_power_mode);
>
>  /**
> + * mipi_dsi_dcs_get_pixel_format() - gets the pixel format for the RGB image
> + *    data used by the interface
> + * @dsi: DSI peripheral device
> + * @format: return location for the pixel format
> + *
> + * Return: 0 on success or a negative error code on failure.
> + */
> +int mipi_dsi_dcs_get_pixel_format(struct mipi_dsi_device *dsi, u8 *format)
> +{
> +       ssize_t err;
> +
> +       err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_PIXEL_FORMAT, format,
> +                               sizeof(*format));
> +       if (err < 0)
> +               return err;

This should probably return -ENODATA when err != sizeof(*format), like
the previous patch did.

It might be worth moving that logic into mipi_dsi_dcs_read, assuming
we're not interested in partial data.

Sean



> +
> +       return 0;
> +}
> +EXPORT_SYMBOL(mipi_dsi_dcs_get_pixel_format);
> +
> +/**
>   * mipi_dsi_dcs_enter_sleep_mode() - disable all unnecessary blocks inside the
>   *    display module except interface communication
>   * @dsi: DSI peripheral device
> @@ -670,6 +691,27 @@ int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device *dsi,
>  }
>  EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_on);
>
> +/**
> + * mipi_dsi_dcs_set_pixel_format() - sets the pixel format for the RGB image
> + *    data used by the interface
> + * @dsi: DSI peripheral device
> + * @format: pixel format
> + *
> + * Return: 0 on success or a negative error code on failure.
> + */
> +int mipi_dsi_dcs_set_pixel_format(struct mipi_dsi_device *dsi, u8 format)
> +{
> +       ssize_t err;
> +
> +       err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_PIXEL_FORMAT, &format,
> +                                sizeof(format));
> +       if (err < 0)
> +               return err;
> +
> +       return 0;
> +}
> +EXPORT_SYMBOL(mipi_dsi_dcs_set_pixel_format);
> +
>  static int mipi_dsi_drv_probe(struct device *dev)
>  {
>         struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver);
> diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
> index 4cbf8e658a3a..415d01f90086 100644
> --- a/include/drm/drm_mipi_dsi.h
> +++ b/include/drm/drm_mipi_dsi.h
> @@ -197,6 +197,7 @@ ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data,
>  int mipi_dsi_dcs_nop(struct mipi_dsi_device *dsi);
>  int mipi_dsi_dcs_soft_reset(struct mipi_dsi_device *dsi);
>  int mipi_dsi_dcs_get_power_mode(struct mipi_dsi_device *dsi, u8 *mode);
> +int mipi_dsi_dcs_get_pixel_format(struct mipi_dsi_device *dsi, u8 *format);
>  int mipi_dsi_dcs_enter_sleep_mode(struct mipi_dsi_device *dsi);
>  int mipi_dsi_dcs_exit_sleep_mode(struct mipi_dsi_device *dsi);
>  int mipi_dsi_dcs_set_display_off(struct mipi_dsi_device *dsi);
> @@ -204,6 +205,7 @@ int mipi_dsi_dcs_set_display_on(struct mipi_dsi_device *dsi);
>  int mipi_dsi_dcs_set_tear_off(struct mipi_dsi_device *dsi);
>  int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device *dsi,
>                              enum mipi_dsi_dcs_tear_mode mode);
> +int mipi_dsi_dcs_set_pixel_format(struct mipi_dsi_device *dsi, u8 format);
>
>  /**
>   * struct mipi_dsi_driver - DSI driver
> --
> 2.1.2
>