From: Lukas Rusak <lorusak@xxxxxxxxx>
Plane scaling for YUV planar formats should be max 2 times.
Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxx>
Cc: Juha-pekka Heikkila <juha-pekka.heikkila@xxxxxxxxx>
Cc: Shashank Sharma <shashank.sharma@xxxxxxxxx>
Signed-off-by: Lukas Rusak <lorusak@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_display.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index a351c8e219ba..2ac0a55a9c9f 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -13897,7 +13897,7 @@ skl_max_scale(const struct intel_crtc_state *crtc_state,
{
struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
- int max_scale, mult;
+ int max_scale, mult, remainder;
int crtc_clock, max_dotclk, tmpclk1, tmpclk2;
if (!crtc_state->base.enable)
@@ -13914,12 +13914,15 @@ skl_max_scale(const struct intel_crtc_state *crtc_state,
/*
* skl max scale is lower of:
- * close to 3 but not 3, -1 is for that purpose
- * or
- * cdclk/crtc_clock
+ * for planar YUV formats: 2
+ * or
+ * for other formats: close to 3 but not 3, -1 is for that purpose
+ * or
+ * cdclk/crtc_clock
*/
mult = is_planar_yuv_format(pixel_format) ? 2 : 3;
- tmpclk1 = (1 << 16) * mult - 1;
+ remainder = is_planar_yuv_format(pixel_format) ? 0 : 1;
+ tmpclk1 = (1 << 16) * mult - remainder;
tmpclk2 = (1 << 8) * ((max_dotclk << 8) / crtc_clock);
max_scale = min(tmpclk1, tmpclk2);
--
2.17.1
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