From ff395e640bd3944d3434dde1b56fc08617c5945e Mon Sep 17 00:00:00 2001
From: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Date: Fri, 24 Jan 2020 19:23:01 +0200
Subject: drm/i915: Fix inconsistance between pfit.enable and scaler freeing
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Git-commit: cb724911f495b3e8c5c321776b6975689d26579e
Patch-mainline: v5.7-rc1
References: jsc#SLE-12680, jsc#SLE-12880, jsc#SLE-12882, jsc#SLE-12883, jsc#SLE-13496, jsc#SLE-15322
Despite that during hw readout we seem to have scalers assigned
to pipes, then call atomic_setup_scalers, at the commit stage in
skl_update_scaler there is a check, that if we have fb src and
dest of same size, we stage freeing of that scaler.
However we don't update pfit.enabled flag then, which makes
the state inconsistent, which in turn triggers a WARN_ON
in skl_pfit_enable, because we have pfit enabled,
but no assigned scaler.
To me this looks weird that we kind of do the decision
to use or not use the scaler at skl_update_scaler stage
but not in intel_atomic_setup_scalers, moreover
not updating the whole state consistently.
This fix is to not free the scaler if we have pfit.enabled
flag set, so that the state is now consistent
and the warnings are gone.
v2: - Put pfit.enable check into crtc specific place
(Ville Syrj채l채)
Bugzilla: https://gitlab.freedesktop.org/drm/intel/issues/577
Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Reviewed-by: Ville Syrj채l채 <ville.syrjala@linux.intel.com>
Tested-by: Tomi Sarvela <tomi.p.sarvela@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20200124172301.16484-1-stanislav.lisovskiy@intel.com
Signed-off-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/i915/display/intel_display.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 5bdb1d578fc8..1d15bf7b6192 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -6071,7 +6071,8 @@ int skl_update_scaler_crtc(struct intel_crtc_state *state)
const struct drm_display_mode *adjusted_mode = &state->hw.adjusted_mode;
bool need_scaler = false;
- if (state->output_format == INTEL_OUTPUT_FORMAT_YCBCR420)
+ if (state->output_format == INTEL_OUTPUT_FORMAT_YCBCR420 ||
+ state->pch_pfit.enabled)
need_scaler = true;
return skl_update_scaler(state, !state->hw.active, SKL_CRTC_INDEX,
--
2.28.0