[Intel-gfx] [PATCH v9 2/8] drm/i915/vdsc: Add a check for dsc split cases

[Suraj Kandpal]

In intel_vdsc_get_config we only read the primary dsc engine register
and not take into account if the other dsc engine is in use and if
both registers have the same value or not this patche fixes that by
adding a check.

--v3
-Remove superfluos new line [Jani]
-Fix register naming [Jani]

--v5
-pps_temp0/pps_temp1 can be assigned where they are used [Ankit]

Signed-off-by: Suraj Kandpal <suraj.kandpal at intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
---
 drivers/gpu/drm/i915/display/intel_vdsc.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_vdsc.c b/drivers/gpu/drm/i915/display/intel_vdsc.c
index e4c395b4dc46..94af579b63d3 100644
--- a/drivers/gpu/drm/i915/display/intel_vdsc.c
+++ b/drivers/gpu/drm/i915/display/intel_vdsc.c
@@ -1002,7 +1002,7 @@ void intel_dsc_get_config(struct intel_crtc_state *crtc_state)
 	enum pipe pipe = crtc->pipe;
 	enum intel_display_power_domain power_domain;
 	intel_wakeref_t wakeref;
-	u32 dss_ctl1, dss_ctl2, pps0 = 0, pps1 = 0;
+	u32 dss_ctl1, dss_ctl2, pps0 = 0, pps1 = 0, pps_temp0, pps_temp1;
 
 	if (!intel_dsc_source_support(crtc_state))
 		return;
@@ -1028,11 +1028,23 @@ void intel_dsc_get_config(struct intel_crtc_state *crtc_state)
 	/* PPS0 & PPS1 */
 	if (!is_pipe_dsc(crtc, cpu_transcoder)) {
 		pps1 = intel_de_read(dev_priv, DSCA_PICTURE_PARAMETER_SET_1);
+		if (crtc_state->dsc.dsc_split) {
+			pps_temp1 = intel_de_read(dev_priv, DSCC_PICTURE_PARAMETER_SET_1);
+			drm_WARN_ON(&dev_priv->drm, pps1 != pps_temp1);
+		}
 	} else {
 		pps0 = intel_de_read(dev_priv,
 				     ICL_DSC0_PICTURE_PARAMETER_SET_0(pipe));
 		pps1 = intel_de_read(dev_priv,
 				     ICL_DSC0_PICTURE_PARAMETER_SET_1(pipe));
+		if (crtc_state->dsc.dsc_split) {
+			pps_temp0 = intel_de_read(dev_priv,
+						  ICL_DSC1_PICTURE_PARAMETER_SET_0(pipe));
+			pps_temp1 = intel_de_read(dev_priv,
+						  ICL_DSC1_PICTURE_PARAMETER_SET_1(pipe));
+			drm_WARN_ON(&dev_priv->drm, pps0 != pps_temp0);
+			drm_WARN_ON(&dev_priv->drm, pps1 != pps_temp1);
+		}
 	}
 
 	vdsc_cfg->bits_per_pixel = pps1;
-- 
2.25.1