drm/i915/mtl: Support HBR3 rate with C10 phy and eDP in MTL

eDP specification supports HBR3 link rate since v1.4a. Moreover,
C10 phy can support HBR3 link rate for both DP and eDP. Therefore,
do not clamp the supported rates for eDP at 6.75Gbps.

Cc: <[email protected]>

BSpec: 70073 74224

Signed-off-by: Chaitanya Kumar Borah <[email protected]>
Reviewed-by: Mika Kahola <[email protected]>
Signed-off-by: Mika Kahola <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
(cherry picked from commit a343165)
Signed-off-by: Jani Nikula <[email protected]>

Author: ckborah

drivers/gpu/drm/i915/display/intel_dp.c

@@ -430,7 +430,7 @@ static int mtl_max_source_rate(struct intel_dp *intel_dp)
 	enum phy phy = intel_port_to_phy(i915, dig_port->base.port);
 
 	if (intel_is_c10phy(i915, phy))
-		return intel_dp_is_edp(intel_dp) ? 675000 : 810000;
+		return 810000;
 
 	return 2000000;
 }