From: Alex Deucher Date: Wed, 10 Dec 2014 14:42:10 +0000 (-0500) Subject: drm/radeon: properly filter DP1.2 4k modes on non-DP1.2 hw X-Git-Tag: v4.14-rc1~6161^2~1^2~2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=410cce2a6b82299b46ff316c6384e789ce275ecb;p=platform%2Fkernel%2Flinux-rpi.git drm/radeon: properly filter DP1.2 4k modes on non-DP1.2 hw 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 Cc:stable@vge.kernel.org --- diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c index 11ba9d2..db42a67 100644 --- a/drivers/gpu/drm/radeon/atombios_dp.c +++ b/drivers/gpu/drm/radeon/atombios_dp.c @@ -492,6 +492,10 @@ 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;