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    Subject[PATCH 3.13.y-ckt 099/143] drm/radeon/dp: Set EDP_CONFIGURATION_SET for bridge chips if necessary
    Date
    3.13.11-ckt18 -stable review patch.  If anyone has any objections, please let me know.

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

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

    commit 66c2b84ba6256bc5399eed45582af9ebb3ba2c15 upstream.

    Don't restrict it to just eDP panels. Some LVDS bridge chips require
    this. Fixes blank panels on resume on certain laptops. Noticed
    by mrnuke on IRC.

    bug:
    https://bugs.freedesktop.org/show_bug.cgi?id=42960

    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    Signed-off-by: Kamal Mostafa <kamal@canonical.com>
    ---
    drivers/gpu/drm/radeon/atombios_dp.c | 4 +---
    1 file changed, 1 insertion(+), 3 deletions(-)

    diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c
    index 719c7a1..13b458e 100644
    --- a/drivers/gpu/drm/radeon/atombios_dp.c
    +++ b/drivers/gpu/drm/radeon/atombios_dp.c
    @@ -700,10 +700,8 @@ static int radeon_dp_link_train_init(struct radeon_dp_link_train_info *dp_info)
    radeon_write_dpcd_reg(dp_info->radeon_connector,
    DP_DOWNSPREAD_CTRL, 0);

    - if ((dp_info->connector->connector_type == DRM_MODE_CONNECTOR_eDP) &&
    - (dig->panel_mode == DP_PANEL_MODE_INTERNAL_DP2_MODE)) {
    + if (dig->panel_mode == DP_PANEL_MODE_INTERNAL_DP2_MODE)
    radeon_write_dpcd_reg(dp_info->radeon_connector, DP_EDP_CONFIGURATION_SET, 1);
    - }

    /* set the lane count on the sink */
    tmp = dp_info->dp_lane_count;
    --
    1.9.1


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