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    Subject[PATCH 4.19 231/421] drm/amd/display: fix use_max_lb flag for 420 pixel formats
    Date
    From: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>

    [ 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@amd.com>
    Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
    Acked-by: Stylon Wang <stylon.wang@amd.com>
    Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/gpu/drm/amd/display/dc/dcn10/dcn10_dpp_dscl.c | 9 ++++++---
    1 file changed, 6 insertions(+), 3 deletions(-)

    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 321af9af95e8..8f5246308d26 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
    @@ -476,10 +476,13 @@ 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);
    --
    2.30.2


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