drm/radeon: properly filter DP1.2 4k modes on non-DP1.2 hw
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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -574,6 +574,10 @@ int radeon_dp_mode_valid_helper(struct drm_connector *connector,
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struct radeon_connector_atom_dig *dig_connector;
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int dp_clock;
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if ((mode->clock > 340000) &&
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(!radeon_connector_is_dp12_capable(connector)))
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return MODE_CLOCK_HIGH;
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if (!radeon_connector->con_priv)
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return MODE_CLOCK_HIGH;
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dig_connector = radeon_connector->con_priv;
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