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    Subject[PATCH 3.11 149/233] drm/radeon: disable ss on DP for DCE3.x
    Date
    3.11.10.4 -stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Alex Deucher <alexander.deucher@amd.com>

    commit d8e24525094200601236fa64a54cf73e3d682f2e upstream.

    Seems to cause problems with certain DP monitors.

    Bug:
    https://bugs.freedesktop.org/show_bug.cgi?id=40699

    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
    ---
    drivers/gpu/drm/radeon/atombios_crtc.c | 5 ++++-
    1 file changed, 4 insertions(+), 1 deletion(-)

    diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
    index 8b92676..ed8bc9d 100644
    --- a/drivers/gpu/drm/radeon/atombios_crtc.c
    +++ b/drivers/gpu/drm/radeon/atombios_crtc.c
    @@ -938,11 +938,14 @@ static bool atombios_crtc_prepare_pll(struct drm_crtc *crtc, struct drm_display_
    radeon_atombios_get_ppll_ss_info(rdev,
    &radeon_crtc->ss,
    ATOM_DP_SS_ID1);
    - } else
    + } else {
    radeon_crtc->ss_enabled =
    radeon_atombios_get_ppll_ss_info(rdev,
    &radeon_crtc->ss,
    ATOM_DP_SS_ID1);
    + }
    + /* disable spread spectrum on DCE3 DP */
    + radeon_crtc->ss_enabled = false;
    }
    break;
    case ATOM_ENCODER_MODE_LVDS:
    --
    1.8.3.2


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