Commit 0c2287c9 authored by Ankit Nautiyal's avatar Ankit Nautiyal
Browse files

drm/display/dp: Add helper function to get DSC bpp precision 



Add helper to get the DSC bits_per_pixel precision for the DP sink.

Signed-off-by: default avatarAnkit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: default avatarSuraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: default avatarSui Jingfeng <suijingfeng@loongson.cn>
Acked-by: default avatarMaxime Ripard <mripard@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20231110101020.4067342-2-ankit.k.nautiyal@intel.com
parent 59be9024

drivers/gpu/drm/display/drm_dp_helper.c

+27 −0
Original line number Diff line number Diff line
@@ -2325,6 +2325,33 @@ int drm_dp_read_desc(struct drm_dp_aux *aux, struct drm_dp_desc *desc, 
}

EXPORT_SYMBOL(drm_dp_read_desc);



/**

 * drm_dp_dsc_sink_bpp_incr() - Get bits per pixel increment

 * @dsc_dpcd: DSC capabilities from DPCD

 *

 * Returns the bpp precision supported by the DP sink.

 */

u8 drm_dp_dsc_sink_bpp_incr(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])

{

	u8 bpp_increment_dpcd = dsc_dpcd[DP_DSC_BITS_PER_PIXEL_INC - DP_DSC_SUPPORT];



	switch (bpp_increment_dpcd) {

	case DP_DSC_BITS_PER_PIXEL_1_16:

		return 16;

	case DP_DSC_BITS_PER_PIXEL_1_8:

		return 8;

	case DP_DSC_BITS_PER_PIXEL_1_4:

		return 4;

	case DP_DSC_BITS_PER_PIXEL_1_2:

		return 2;

	case DP_DSC_BITS_PER_PIXEL_1_1:

		return 1;

	}



	return 0;

}

EXPORT_SYMBOL(drm_dp_dsc_sink_bpp_incr);



/**

 * drm_dp_dsc_sink_max_slice_count() - Get the max slice count

 * supported by the DSC sink.

include/drm/display/drm_dp_helper.h

+1 −0
Original line number Diff line number Diff line
@@ -164,6 +164,7 @@ drm_dp_is_branch(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) 
}



/* DP/eDP DSC support */

u8 drm_dp_dsc_sink_bpp_incr(const u8 dsc_dpcd[DP_DSC_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]);