Commit 2b68b9b8 authored Dec 22, 2025 by Imre Deak

drm/i915/dp: Simplify computing forced DSC BPP for DP-SST



If dsc_compute_compressed_bpp() failed with a forced pipe BPP value
(where the forced pipe BPP value itself is valid within the min/max pipe
BPP limits), the function will also fail when called with the maximum
pipe BPP value: dsc_compute_compressed_bpp() will try all compressed
BPPs below the passed in pipe BPP value and if the function failed with
a given (low) compressed BPP value it will also fail with a compressed
BPP value higher than the one which failed already.

Based on the above remove the logic to retry computing a compressed BPP
value with the maximum pipe BPP value if computing the compressed BPP
failed already with the (lower) forced pipe BPP value.

Reviewed-by: Vinod Govindapillai <vinod.govindapillai@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20251222153547.713360-18-imre.deak@intel.com

parent ce46682f

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

+4 −10

Original line number	Diff line number	Diff line
		@@ -2299,17 +2299,11 @@ static int intel_dp_dsc_compute_pipe_bpp(struct intel_dp *intel_dp,
		int ret;

		forced_bpp = intel_dp_force_dsc_pipe_bpp(intel_dp, limits);

		if (forced_bpp) {
		ret = dsc_compute_compressed_bpp(intel_dp, pipe_config, conn_state,
		limits, forced_bpp);
		if (ret == 0) {
		pipe_config->pipe_bpp = forced_bpp;
		return 0;
		}
		}

		if (forced_bpp)
		pipe_bpp = forced_bpp;
		else
		pipe_bpp = limits->pipe.max_bpp;

		ret = dsc_compute_compressed_bpp(intel_dp, pipe_config, conn_state,
		limits, pipe_bpp);
		if (ret)