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    Subject[PATCH AUTOSEL 5.1 026/141] drm/amd/display: CS_TFM_1D only applied post EOTF
    Date
    From: Krunoslav Kovac <Krunoslav.Kovac@amd.com>

    [ Upstream commit 6ad34adeaec5b56a5ba90e90099cabf1c1fe9dd2 ]

    [Why]
    There's some unnecessary mem allocation for CS_TFM_ID. What's worse, it
    depends on LUT size and since it's 4K for CS_TFM_1D, it is 16x bigger
    than in regular case when it's actually needed. This leads to some
    crashes in stress conditions.

    [How]
    Skip ramp combining designed for RGB256 and DXGI gamma with CS_TFM_1D.

    Signed-off-by: Krunoslav Kovac <Krunoslav.Kovac@amd.com>
    Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
    Acked-by: Leo Li <sunpeng.li@amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/gpu/drm/amd/display/modules/color/color_gamma.c | 3 ++-
    1 file changed, 2 insertions(+), 1 deletion(-)

    diff --git a/drivers/gpu/drm/amd/display/modules/color/color_gamma.c b/drivers/gpu/drm/amd/display/modules/color/color_gamma.c
    index a1055413bade..31f867bb5afe 100644
    --- a/drivers/gpu/drm/amd/display/modules/color/color_gamma.c
    +++ b/drivers/gpu/drm/amd/display/modules/color/color_gamma.c
    @@ -1564,7 +1564,8 @@ bool mod_color_calculate_regamma_params(struct dc_transfer_func *output_tf,

    output_tf->type = TF_TYPE_DISTRIBUTED_POINTS;

    - if (ramp && (mapUserRamp || ramp->type != GAMMA_RGB_256)) {
    + if (ramp && ramp->type != GAMMA_CS_TFM_1D &&
    + (mapUserRamp || ramp->type != GAMMA_RGB_256)) {
    rgb_user = kvcalloc(ramp->num_entries + _EXTRA_POINTS,
    sizeof(*rgb_user),
    GFP_KERNEL);
    --
    2.20.1
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