Commit 4d4101c8 authored by Manasi Navare's avatar Manasi Navare
Browse files

drm/dsc: Modify DRM helper to return complete DSC color depth capabilities 



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: default avatarManasi Navare <manasi.d.navare@intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Acked-by: Sean Paul <seanpaul@chromium.org> (For merging through
drm-intel)
Reviewed-by: default avatarVille Syrjala <ville.syrjala@linux.intel.com>
Reviewed-by: default avatarAnusha Srivatsa <anusha.srivatsa@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181127214125.17658-1-manasi.d.navare@intel.com
parent 39e84937

drivers/gpu/drm/drm_dp_helper.c

+8 −6
Original line number Diff line number Diff line
@@ -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);

include/drm/drm_dp_helper.h

+2 −1
Original line number Diff line number Diff line
@@ -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])

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