drm/i915: Validate mode against max. link data rate for DP MST
Not validating the mode rate against max. link rate results in not pruning
invalid modes. For e.g, a HBR2 5.4 Gbps 2-lane configuration does not
support 4k@60Hz. But, we do not reject this mode.
So, make use of the helpers in intel_dp to validate mode data rate against
max. link data rate of a configuration.
v3: Renamed local variables again for consistency (Manasi)
v2: Renamed mode data rate local variable to be more explanatory.
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1479243546-17189-1-git-send-email-dhinakaran.pandiyan@intel.com
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 53fc1b3..db75bb9 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -161,14 +161,14 @@ static u8 intel_dp_max_lane_count(struct intel_dp *intel_dp)
return min(source_max, sink_max);
}
-static int
+int
intel_dp_link_required(int pixel_clock, int bpp)
{
/* pixel_clock is in kHz, divide bpp by 8 for bit to Byte conversion */
return DIV_ROUND_UP(pixel_clock * bpp, 8);
}
-static int
+int
intel_dp_max_data_rate(int max_link_clock, int max_lanes)
{
/* max_link_clock is the link symbol clock (LS_Clk) in kHz and not the