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    Subject[PATCH AUTOSEL 5.5 499/542] radeon: insert 10ms sleep in dce5_crtc_load_lut
    Date
    From: Daniel Vetter <daniel.vetter@ffwll.ch>

    [ Upstream commit ec3d65082d7dabad6fa8f66a8ef166f2d522d6b2 ]

    Per at least one tester this is enough magic to recover the regression
    introduced for some people (but not all) in

    commit b8e2b0199cc377617dc238f5106352c06dcd3fa2
    Author: Peter Rosin <peda@axentia.se>
    Date: Tue Jul 4 12:36:57 2017 +0200

    drm/fb-helper: factor out pseudo-palette

    which for radeon had the side-effect of refactoring out a seemingly
    redudant writing of the color palette.

    10ms in a fairly slow modeset path feels like an acceptable form of
    duct-tape, so maybe worth a shot and see what sticks.

    Cc: Alex Deucher <alexander.deucher@amd.com>
    Cc: Michel Dänzer <michel.daenzer@amd.com>
    References: https://bugzilla.kernel.org/show_bug.cgi?id=198123
    Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/gpu/drm/radeon/radeon_display.c | 2 ++
    1 file changed, 2 insertions(+)

    diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
    index 84d3d885b7a46..606972c4593aa 100644
    --- a/drivers/gpu/drm/radeon/radeon_display.c
    +++ b/drivers/gpu/drm/radeon/radeon_display.c
    @@ -127,6 +127,8 @@ static void dce5_crtc_load_lut(struct drm_crtc *crtc)

    DRM_DEBUG_KMS("%d\n", radeon_crtc->crtc_id);

    + msleep(10);
    +
    WREG32(NI_INPUT_CSC_CONTROL + radeon_crtc->crtc_offset,
    (NI_INPUT_CSC_GRPH_MODE(NI_INPUT_CSC_BYPASS) |
    NI_INPUT_CSC_OVL_MODE(NI_INPUT_CSC_BYPASS)));
    --
    2.20.1
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