[PATCH 08/15] drm/dsi: Implement DCS nop command

[Andrzej Hajda]

On 10/13/2014 12:16 PM, Thierry Reding wrote:
> From: Thierry Reding <treding at nvidia.com>
>
> Provide a small convenience wrapper that transmits a DCS nop command.
>
> Signed-off-by: Thierry Reding <treding at nvidia.com>

For this and patches 09, 11, 12 the same comments apply as for 06/15.
Beside this they look OK to me.


Regards
Andrzej

> ---
>  drivers/gpu/drm/drm_mipi_dsi.c | 18 ++++++++++++++++++
>  include/drm/drm_mipi_dsi.h     |  1 +
>  2 files changed, 19 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
> index 6749b88a6c72..c88dcda2f4ac 100644
> --- a/drivers/gpu/drm/drm_mipi_dsi.c
> +++ b/drivers/gpu/drm/drm_mipi_dsi.c
> @@ -517,6 +517,24 @@ ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data,
>  EXPORT_SYMBOL(mipi_dsi_dcs_read);
>  
>  /**
> + * mipi_dsi_dcs_nop() - send DCS nop packet
> + * @dsi: DSI peripheral device
> + *
> + * Return: 0 on success or a negative error code on failure.
> + */
> +int mipi_dsi_dcs_nop(struct mipi_dsi_device *dsi)
> +{
> +	ssize_t err;
> +
> +	err = mipi_dsi_dcs_write(dsi, MIPI_DCS_NOP, NULL, 0);
> +	if (err < 0)
> +		return err;
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(mipi_dsi_dcs_nop);
> +
> +/**
>   * mipi_dsi_dcs_enter_sleep_mode() - disable all unnecessary blocks inside the
>   *    display module except interface communication
>   * @dsi: DSI peripheral device
> diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
> index 8693711eb623..be16c8e769bd 100644
> --- a/include/drm/drm_mipi_dsi.h
> +++ b/include/drm/drm_mipi_dsi.h
> @@ -170,6 +170,7 @@ ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, u8 cmd,
>  			   const void *data, size_t len);
>  ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data,
>  			  size_t len);
> +int mipi_dsi_dcs_nop(struct mipi_dsi_device *dsi);
>  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);