[PATCH 06/19] drm/i915/display: Account for DSC not split case while computing cdclk

[Ankit Nautiyal <ankit.k.nautiyal@xxxxxxxxx>]

Currently we assume 2 Pixels Per Clock (PPC) while computing
plane cdclk and min_cdlck. In cases where DSC single engine
is used the throughput is 1 PPC.

So account for the above case, while computing cdclk.

v2: Use helper to get the adjusted pixel rate.

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@xxxxxxxxx>
---
 drivers/gpu/drm/i915/display/intel_cdclk.c         |  3 ++-
 drivers/gpu/drm/i915/display/intel_vdsc.c          | 12 ++++++++++++
 drivers/gpu/drm/i915/display/intel_vdsc.h          |  2 ++
 drivers/gpu/drm/i915/display/skl_universal_plane.c |  4 ++--
 4 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_cdclk.c b/drivers/gpu/drm/i915/display/intel_cdclk.c
index 4207863b7b2a..990dc16511f9 100644
--- a/drivers/gpu/drm/i915/display/intel_cdclk.c
+++ b/drivers/gpu/drm/i915/display/intel_cdclk.c
@@ -37,6 +37,7 @@
 #include "intel_pci_config.h"
 #include "intel_pcode.h"
 #include "intel_psr.h"
+#include "intel_vdsc.h"
 #include "vlv_sideband.h"
 
 /**
@@ -2507,7 +2508,7 @@ static int intel_pixel_rate_to_cdclk(const struct intel_crtc_state *crtc_state)
 	int pixel_rate = crtc_state->pixel_rate;
 
 	if (DISPLAY_VER(dev_priv) >= 10)
-		return DIV_ROUND_UP(pixel_rate, 2);
+		return intel_dsc_get_adjusted_pixel_rate(crtc_state, pixel_rate);
 	else if (DISPLAY_VER(dev_priv) == 9 ||
 		 IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv))
 		return pixel_rate;
diff --git a/drivers/gpu/drm/i915/display/intel_vdsc.c b/drivers/gpu/drm/i915/display/intel_vdsc.c
index bd9116d2cd76..11227491834e 100644
--- a/drivers/gpu/drm/i915/display/intel_vdsc.c
+++ b/drivers/gpu/drm/i915/display/intel_vdsc.c
@@ -974,3 +974,15 @@ void intel_dsc_get_config(struct intel_crtc_state *crtc_state)
 out:
 	intel_display_power_put(dev_priv, power_domain, wakeref);
 }
+
+int intel_dsc_get_adjusted_pixel_rate(const struct intel_crtc_state *crtc_state, int pixel_rate)
+{
+	/*
+	 * If single VDSC engine is used, it uses one pixel per clock
+	 * otherwise we use two pixels per clock.
+	 */
+	if (crtc_state->dsc.compression_enable && !crtc_state->dsc.dsc_split)
+		return pixel_rate;
+
+	return DIV_ROUND_UP(pixel_rate, 2);
+}
diff --git a/drivers/gpu/drm/i915/display/intel_vdsc.h b/drivers/gpu/drm/i915/display/intel_vdsc.h
index 8763f00fa7e2..9f21a6c565c6 100644
--- a/drivers/gpu/drm/i915/display/intel_vdsc.h
+++ b/drivers/gpu/drm/i915/display/intel_vdsc.h
@@ -27,4 +27,6 @@ void intel_dsc_dsi_pps_write(struct intel_encoder *encoder,
 void intel_dsc_dp_pps_write(struct intel_encoder *encoder,
 			    const struct intel_crtc_state *crtc_state);
 
+int intel_dsc_get_adjusted_pixel_rate(const struct intel_crtc_state *crtc_state, int pixel_rate);
+
 #endif /* __INTEL_VDSC_H__ */
diff --git a/drivers/gpu/drm/i915/display/skl_universal_plane.c b/drivers/gpu/drm/i915/display/skl_universal_plane.c
index 6b01a0b68b97..9eeb25ec4be9 100644
--- a/drivers/gpu/drm/i915/display/skl_universal_plane.c
+++ b/drivers/gpu/drm/i915/display/skl_universal_plane.c
@@ -17,6 +17,7 @@
 #include "intel_fb.h"
 #include "intel_fbc.h"
 #include "intel_psr.h"
+#include "intel_vdsc.h"
 #include "skl_scaler.h"
 #include "skl_universal_plane.h"
 #include "skl_watermark.h"
@@ -263,8 +264,7 @@ static int icl_plane_min_cdclk(const struct intel_crtc_state *crtc_state,
 {
 	unsigned int pixel_rate = intel_plane_pixel_rate(crtc_state, plane_state);
 
-	/* two pixels per clock */
-	return DIV_ROUND_UP(pixel_rate, 2);
+	return intel_dsc_get_adjusted_pixel_rate(crtc_state, pixel_rate);
 }
 
 static void
-- 
2.40.1