Commit 5bbdcc86 authored by Swati Sharma's avatar Swati Sharma Committed by Ankit Nautiyal
Browse files

drm/i915/dsc: Allow DSC only with fractional bpp when forced from debugfs 



If force_dsc_fractional_bpp_en is set through debugfs allow DSC iff
compressed bpp is fractional. Continue if the computed compressed bpp
turns out to be a integer.

v2:
-Use helpers for fractional, integral bits of bits_per_pixel. (Suraj)
-Fix comment (Suraj)

Signed-off-by: default avatarSwati Sharma <swati2.sharma@intel.com>
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>
Link: https://patchwork.freedesktop.org/patch/msgid/20231110101020.4067342-9-ankit.k.nautiyal@intel.com
parent 680c1e31

drivers/gpu/drm/i915/display/intel_dp.c

+7 −0
Original line number Diff line number Diff line
@@ -1928,6 +1928,9 @@ xelpd_dsc_compute_link_config(struct intel_dp *intel_dp, 
	for (compressed_bppx16 = dsc_max_bpp;

	     compressed_bppx16 >= dsc_min_bpp;

	     compressed_bppx16 -= bppx16_step) {

		if (intel_dp->force_dsc_fractional_bpp_en &&

		    !to_bpp_frac(compressed_bppx16))

			continue;

		ret = dsc_compute_link_config(intel_dp,

					      pipe_config,

					      limits,
@@ -1935,6 +1938,10 @@ xelpd_dsc_compute_link_config(struct intel_dp *intel_dp, 
					      timeslots);

		if (ret == 0) {

			pipe_config->dsc.compressed_bpp_x16 = compressed_bppx16;

			if (intel_dp->force_dsc_fractional_bpp_en &&

			    to_bpp_frac(compressed_bppx16))

				drm_dbg_kms(&i915->drm, "Forcing DSC fractional bpp\n");



			return 0;

		}

	}