Commit 410cce2a authored Dec 10, 2014 by Alex Deucher

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 <alexander.deucher@amd.com>
Cc:stable@vge.kernel.org

parent 5665c3eb

drivers/gpu/drm/radeon/atombios_dp.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -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;