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    Subject[PATCH 3.8 050/116] drm/radeon/atom: fix dithering on certain panels
    Date
    3.8.13.27 -stable review patch.  If anyone has any objections, please let me know.

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

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

    commit 642528355c694f5ed68f6bff9ff520326a249f99 upstream.

    We need to specify the encoder mode as LVDS for eDP
    when using the Crtc_Source atom table in order to properly
    set up the FMT hardware.

    bug:
    https://bugs.freedesktop.org/show_bug.cgi?id=73911

    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    Signed-off-by: Kamal Mostafa <kamal@canonical.com>
    ---
    drivers/gpu/drm/radeon/atombios_encoders.c | 5 ++++-
    1 file changed, 4 insertions(+), 1 deletion(-)

    diff --git a/drivers/gpu/drm/radeon/atombios_encoders.c b/drivers/gpu/drm/radeon/atombios_encoders.c
    index 71619b0..f04f3c9 100644
    --- a/drivers/gpu/drm/radeon/atombios_encoders.c
    +++ b/drivers/gpu/drm/radeon/atombios_encoders.c
    @@ -1877,8 +1877,11 @@ atombios_set_encoder_crtc_source(struct drm_encoder *encoder)
    args.v2.ucEncodeMode = ATOM_ENCODER_MODE_CRT;
    else
    args.v2.ucEncodeMode = atombios_get_encoder_mode(encoder);
    - } else
    + } else if (radeon_encoder->devices & (ATOM_DEVICE_LCD_SUPPORT)) {
    + args.v2.ucEncodeMode = ATOM_ENCODER_MODE_LVDS;
    + } else {
    args.v2.ucEncodeMode = atombios_get_encoder_mode(encoder);
    + }
    switch (radeon_encoder->encoder_id) {
    case ENCODER_OBJECT_ID_INTERNAL_UNIPHY:
    case ENCODER_OBJECT_ID_INTERNAL_UNIPHY1:
    --
    1.9.1


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