on SKL/BXT, the top most plane hardware is shared between the legacy
cursor registers and an actual plane. Daniel and Ville don't want to
expose 2 DRM planes and would rather expose a CURSOR plane that has all
the usual plane properties, and that's a blocker for lifting the
prelimary_hw_support flag.
Unfortunately noone has had the time to finish this yet, but lifting the
prelimary_hw_support flag is long overdue. As an intermediate solution
we can merely not expose the top most plane
Cc: Imre Deak <imre.deak@xxxxxxxxx>
Signed-off-by: Damien Lespiau <damien.lespiau@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_dma.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 91925cb..96564cd 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -726,11 +726,19 @@ static void intel_device_info_runtime_init(struct drm_device *dev)
info = (struct intel_device_info *)&dev_priv->info;
+ /*
+ * Skylake and Broxton currently don't expose the topmost plane as its
+ * use is exclusive with the legacy cursor and we only want to expose
+ * one of those, not both. Until we can safely expose the topmost plane
+ * as a DRM_PLANE_TYPE_CURSOR with all the features exposed/supported,
+ * we don't expose the topmost plane at all to prevent ABI breakage
+ * down the line.
+ */
if (IS_BROXTON(dev)) {
- info->num_sprites[PIPE_A] = 3;
- info->num_sprites[PIPE_B] = 3;
- info->num_sprites[PIPE_C] = 2;
- } else if (IS_VALLEYVIEW(dev) || INTEL_INFO(dev)->gen == 9)
+ info->num_sprites[PIPE_A] = 2;
+ info->num_sprites[PIPE_B] = 2;
+ info->num_sprites[PIPE_C] = 1;
+ } else if (IS_VALLEYVIEW(dev))
for_each_pipe(dev_priv, pipe)
info->num_sprites[pipe] = 2;
else
--
2.1.0
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