We still need "Bump up CDCLK" workaround otherwise getting
underruns - however currently it blocks 8K as CDCLK = Pixel rate,
in 8K case would require CDCLK to be around 1 Ghz which is not
possible.
v2: - Convert to expression(max(min_cdclk, min(pixel_rate, max_cdclk))
(Ville Syrjälä)
- Use type specific min_t, max_t(Ville Syrjälä)
Signed-off-by: Stanislav Lisovskiy <[email protected]>
---
drivers/gpu/drm/i915/display/intel_cdclk.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_cdclk.c
b/drivers/gpu/drm/i915/display/intel_cdclk.c
index 45f7f33d1144..8f9320e1e249 100644
--- a/drivers/gpu/drm/i915/display/intel_cdclk.c
+++ b/drivers/gpu/drm/i915/display/intel_cdclk.c
@@ -2080,8 +2080,15 @@ int intel_crtc_compute_min_cdclk(const struct
intel_crtc_state *crtc_state)
* Explicitly stating here that this seems to be currently
* rather a Hack, than final solution.
*/
- if (IS_TIGERLAKE(dev_priv))
- min_cdclk = max(min_cdclk, (int)crtc_state->pixel_rate);
+ if (IS_TIGERLAKE(dev_priv)) {
+ /*
+ * Clamp to max_cdclk_freq in case pixel rate is higher,
+ * in order not to break an 8K, but still leave W/A at place.
+ */
+ min_cdclk = max_t(int, min_cdclk,
+ min_t(int, crtc_state->pixel_rate,
+ dev_priv->max_cdclk_freq));
+ }
if (min_cdclk > dev_priv->max_cdclk_freq) {
drm_dbg_kms(&dev_priv->drm,
--
2.24.1.485.gad05a3d8e5
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