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

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

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Sui Jingfeng <suijingfeng@loongson.cn>
Acked-by: Maxime Ripard <mripard@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20231110101020.4067342-2-ankit.k.nautiyal@intel.com
This commit is contained in:
Ankit Nautiyal 2023-11-10 15:40:10 +05:30
parent 59be90248b
commit 0c2287c965
2 changed files with 28 additions and 0 deletions
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27
drivers/gpu/drm/display/drm_dp_helper.c
View file

@ -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.

1
include/drm/display/drm_dp_helper.h
View file

@ -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]);