drm/i915/ehl: Update port clock voltage level requirements

Voltage level depends not only on the cdclk, but also on the DDI clock.
Last time the bspec voltage level table for EHL was updated, we only
updated the cdclk requirements, but forgot to account for the new port
clock criteria.

Bspec: 21809
Fixes: d147483884ed ("drm/i915/ehl: Update voltage level checks")
Cc: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200207001417.1229251-1-matthew.d.roper@intel.com
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 677dc14c11ef8b592749781acf6d1be528322f5c..ad319224dd54961b797b09d1277527dbc04a89e6 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -4238,7 +4238,9 @@ static bool intel_ddi_is_audio_enabled(struct drm_i915_private *dev_priv,
 void intel_ddi_compute_min_voltage_level(struct drm_i915_private *dev_priv,
                                         struct intel_crtc_state *crtc_state)
 {
-       if (INTEL_GEN(dev_priv) >= 11 && crtc_state->port_clock > 594000)
+       if (IS_ELKHARTLAKE(dev_priv) && crtc_state->port_clock > 594000)
+               crtc_state->min_voltage_level = 3;
+       else if (INTEL_GEN(dev_priv) >= 11 && crtc_state->port_clock > 594000)
                crtc_state->min_voltage_level = 1;
        else if (IS_CANNONLAKE(dev_priv) && crtc_state->port_clock > 594000)
                crtc_state->min_voltage_level = 2;