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Commit ee59792c authored by Ville Syrjälä's avatar Ville Syrjälä Committed by Tvrtko Ursulin
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drm/i915: Disable DRRS on IVB/HSW port != A



Currently we allow DRRS on IVB PCH ports, but we're missing a
few programming steps meaning it is guaranteed to not work.
And on HSW DRRS is not supported on anything but port A ever
as only transcoder EDP has the M2/N2 registers (though I'm
not sure if HSW ever has eDP on any other port).

Starting from BDW all transcoders have the dynamically
reprogrammable M/N registers so DRRS could work on any
port.

Stop initializing DRRS on ports where it cannot possibly work.

Cc: stable@vger.kernel.org
Signed-off-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220128103757.22461-11-ville.syrjala@linux.intel.com


Reviewed-by: default avatarJani Nikula <jani.nikula@intel.com>
(cherry picked from commit f0d4ce59)
Signed-off-by: default avatarTvrtko Ursulin <tvrtko.ursulin@intel.com>
parent eb48d421
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