@@ -2325,6 +2325,19 @@ int intel_crtc_compute_min_cdclk(const struct intel_crtc_state *crtc_state)
dev_priv->max_cdclk_freq));
}
+ if (IS_ALDERLAKE_P(dev_priv)) {
+ struct intel_encoder *encoder;
+
+ for_each_intel_encoder_with_psr(&dev_priv->drm, encoder) {
+ struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
+
+ if (intel_dp->psr.psr2_enabled) {
+ min_cdclk = DIV_ROUND_UP(min_cdclk * 100, 85);
+ break;
+ }
+ }
+ }
+
if (min_cdclk > dev_priv->max_cdclk_freq) {
drm_dbg_kms(&dev_priv->drm,
"required cdclk (%d kHz) exceeds max (%d kHz)\n",
We are currently getting FIFO underruns, in particular when PSR2 is enabled. There seem to be no existing workaround or patches, which can fix that issue(were expecting some recent selective fetch update and DBuf bw/SAGV fixes to help, which unfortunately didn't). Current idea is that it looks like for some reason the DBuf prefill time isn't enough once we exit PSR2, despite its theoretically correct. So bump it up a bit by 15%(minimum experimental amount required to get it working), if PSR2 is enabled. For PSR1 there is no need in this hack, so we limit it only to PSR2 and Alderlake. Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com> --- drivers/gpu/drm/i915/display/intel_cdclk.c | 13 +++++++++++++ 1 file changed, 13 insertions(+)