From 12a6c931beffeaaa350ef562e91e49918b4b3e68 Mon Sep 17 00:00:00 2001
From: Paulo Zanoni <paulo.r.zanoni@intel.com>
Date: Tue, 31 Jul 2018 17:46:14 -0700
Subject: drm/i915/icl: avoid unclaimed PLANE_NV12_BUF_CFG register
Git-commit: 12a6c931beffeaaa350ef562e91e49918b4b3e68
Patch-mainline: v4.20-rc1
References: fate#326289
We don't have proper watermark NV12 support on ICL due to differences
in how it should be implemented. In commit 234059da0f33
("drm/i915/icl: NV12 y-plane ddb is not in same plane") we avoided
writing the non-existent PLANE_NV12_BUF_CFG registers but we forgot to
also avoid them on the hardware state readout. While the code is still
not correct, at least now we can avoid unclaimed register error
messages when dealing with RGB formats, which makes CI happier.
Also add some FIXME comments in order to make it even more clear that
there's still work to do.
References: commit 234059da0f33 ("drm/i915/icl: NV12 y-plane ddb is
not in same plane")
Cc: Mahesh Kumar <mahesh1.kumar@intel.com>
Reviewed-by: Mahesh Kumar <mahesh1.kumar@intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180801004614.22149-1-paulo.r.zanoni@intel.com
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
---
drivers/gpu/drm/i915/intel_pm.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index f90a3c7f1c40..24f0cab02bbc 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3909,7 +3909,12 @@ skl_ddb_get_hw_plane_state(struct drm_i915_private *dev_priv,
val & PLANE_CTL_ALPHA_MASK);
val = I915_READ(PLANE_BUF_CFG(pipe, plane_id));
- val2 = I915_READ(PLANE_NV12_BUF_CFG(pipe, plane_id));
+ /*
+ * FIXME: add proper NV12 support for ICL. Avoid reading unclaimed
+ * registers for now.
+ */
+ if (INTEL_GEN(dev_priv) < 11)
+ val2 = I915_READ(PLANE_NV12_BUF_CFG(pipe, plane_id));
if (fourcc == DRM_FORMAT_NV12) {
skl_ddb_entry_init_from_hw(dev_priv,
@@ -4977,6 +4982,7 @@ static void skl_write_plane_wm(struct intel_crtc *intel_crtc,
skl_ddb_entry_write(dev_priv, PLANE_BUF_CFG(pipe, plane_id),
&ddb->plane[pipe][plane_id]);
+ /* FIXME: add proper NV12 support for ICL. */
if (INTEL_GEN(dev_priv) >= 11)
return skl_ddb_entry_write(dev_priv,
PLANE_BUF_CFG(pipe, plane_id),
--
2.20.1