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    Subject[PATCH 3.13.y-ckt 026/103] drm/radeon: properly filter DP1.2 4k modes on non-DP1.2 hw
    Date
    3.13.11-ckt16 -stable review patch.  If anyone has any objections, please let me know.

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

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

    commit 410cce2a6b82299b46ff316c6384e789ce275ecb upstream.

    The check was already in place in the dp mode_valid check, but
    radeon_dp_get_dp_link_clock() never returned the high clock
    mode_valid was checking for because that function clipped the
    clock based on the hw capabilities. Add an explicit check
    in the mode_valid function.

    bug:
    https://bugs.freedesktop.org/show_bug.cgi?id=87172

    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, 4 insertions(+)

    diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c
    index 514a623..719c7a1 100644
    --- a/drivers/gpu/drm/radeon/atombios_dp.c
    +++ b/drivers/gpu/drm/radeon/atombios_dp.c
    @@ -574,6 +574,10 @@ int radeon_dp_mode_valid_helper(struct drm_connector *connector,
    struct radeon_connector_atom_dig *dig_connector;
    int dp_clock;

    + if ((mode->clock > 340000) &&
    + (!radeon_connector_is_dp12_capable(connector)))
    + return MODE_CLOCK_HIGH;
    +
    if (!radeon_connector->con_priv)
    return MODE_CLOCK_HIGH;
    dig_connector = radeon_connector->con_priv;
    --
    1.9.1


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