[Intel-gfx] [PATCH v10 01/23] drm/dsc: Modify DRM helper to return complete DSC color depth capabilities

[Ville Syrjälä]

On Tue, Nov 20, 2018 at 10:37:14AM -0800, Manasi Navare wrote:
> DSC DPCD color depth register advertises its color depth capabilities
> by setting each of the bits that corresponding to a specific color
> depth. This patch defines those specific color depths and adds
> a helper to return an array of color depth capabilities.
> 
> v2:
> * Simplify the logic (Ville)
> 
> Signed-off-by: Manasi Navare <manasi.d.navare at intel.com>
> Cc: Ville Syrjala <ville.syrjala at linux.intel.com>

Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

> ---
>  drivers/gpu/drm/drm_dp_helper.c | 14 ++++++++------
>  include/drm/drm_dp_helper.h     |  3 ++-
>  2 files changed, 10 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
> index 6d483487f2b4..2d6c491a0542 100644
> --- a/drivers/gpu/drm/drm_dp_helper.c
> +++ b/drivers/gpu/drm/drm_dp_helper.c
> @@ -1428,17 +1428,19 @@ u8 drm_dp_dsc_sink_line_buf_depth(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
>  }
>  EXPORT_SYMBOL(drm_dp_dsc_sink_line_buf_depth);
>  
> -u8 drm_dp_dsc_sink_max_color_depth(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
> +int drm_dp_dsc_sink_supported_input_bpcs(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE],
> +					 u8 dsc_bpc[3])
>  {
> +	int num_bpc = 0;
>  	u8 color_depth = dsc_dpcd[DP_DSC_DEC_COLOR_DEPTH_CAP - DP_DSC_SUPPORT];
>  
>  	if (color_depth & DP_DSC_12_BPC)
> -		return 12;
> +		dsc_bpc[num_bpc++] = 12;
>  	if (color_depth & DP_DSC_10_BPC)
> -		return 10;
> +		dsc_bpc[num_bpc++] = 10;
>  	if (color_depth & DP_DSC_8_BPC)
> -		return 8;
> +		dsc_bpc[num_bpc++] = 8;
>  
> -	return 0;
> +	return num_bpc;
>  }
> -EXPORT_SYMBOL(drm_dp_dsc_sink_max_color_depth);
> +EXPORT_SYMBOL(drm_dp_dsc_sink_supported_input_bpcs);
> diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
> index 3314e91f6eb3..5736c942c85b 100644
> --- a/include/drm/drm_dp_helper.h
> +++ b/include/drm/drm_dp_helper.h
> @@ -1123,7 +1123,8 @@ drm_dp_is_branch(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
>  u8 drm_dp_dsc_sink_max_slice_count(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE],
>  				   bool is_edp);
>  u8 drm_dp_dsc_sink_line_buf_depth(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE]);
> -u8 drm_dp_dsc_sink_max_color_depth(const u8 dsc_dpc[DP_DSC_RECEIVER_CAP_SIZE]);
> +int drm_dp_dsc_sink_supported_input_bpcs(const u8 dsc_dpc[DP_DSC_RECEIVER_CAP_SIZE],
> +					 u8 dsc_bpc[3]);
>  
>  static inline bool
>  drm_dp_sink_supports_dsc(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
> -- 
> 2.19.1

-- 
Ville Syrjälä
Intel