This is a note to let you know that I've just added the patch titled drm/amd/display: fix use_max_lb flag for 420 pixel formats to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: drm-amd-display-fix-use_max_lb-flag-for-420-pixel-fo.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 62c5ddc57f4c62aea2b26a1e52f42f75c14bfc1f Author: Dmytro Laktyushkin <Dmytro.Laktyushkin@xxxxxxx> Date: Mon Apr 19 17:50:53 2021 -0400 drm/amd/display: fix use_max_lb flag for 420 pixel formats [ Upstream commit 8809a7a4afe90ad9ffb42f72154d27e7c47551ae ] Right now the flag simply selects memory config 0 when flag is true however 420 modes benefit more from memory config 3. Signed-off-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@xxxxxxx> Reviewed-by: Aric Cyr <Aric.Cyr@xxxxxxx> Acked-by: Stylon Wang <stylon.wang@xxxxxxx> Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx> Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_dpp_dscl.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_dpp_dscl.c index d67e0abeee93..11a89d873384 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_dpp_dscl.c +++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_dpp_dscl.c @@ -484,10 +484,13 @@ static enum lb_memory_config dpp1_dscl_find_lb_memory_config(struct dcn10_dpp *d int vtaps_c = scl_data->taps.v_taps_c; int ceil_vratio = dc_fixpt_ceil(scl_data->ratios.vert); int ceil_vratio_c = dc_fixpt_ceil(scl_data->ratios.vert_c); - enum lb_memory_config mem_cfg = LB_MEMORY_CONFIG_0; - if (dpp->base.ctx->dc->debug.use_max_lb) - return mem_cfg; + if (dpp->base.ctx->dc->debug.use_max_lb) { + if (scl_data->format == PIXEL_FORMAT_420BPP8 + || scl_data->format == PIXEL_FORMAT_420BPP10) + return LB_MEMORY_CONFIG_3; + return LB_MEMORY_CONFIG_0; + } dpp->base.caps->dscl_calc_lb_num_partitions( scl_data, LB_MEMORY_CONFIG_1, &num_part_y, &num_part_c);