As per bspec check for DSB status before programming any
of its register. Inline function added to check the dsb status.
Cc: Michel Thierry <michel.thierry@xxxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Signed-off-by: Animesh Manna <animesh.manna@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_dsb.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_dsb.c b/drivers/gpu/drm/i915/display/intel_dsb.c
index 520f2bbcc8ae..d36ee8244427 100644
--- a/drivers/gpu/drm/i915/display/intel_dsb.c
+++ b/drivers/gpu/drm/i915/display/intel_dsb.c
@@ -24,6 +24,15 @@
#define DSB_BYTE_EN (0xf << 20)
#define DSB_REG_VALUE_MASK 0xfffff
+static inline bool is_dsb_busy(struct intel_dsb *dsb)
+{
+ struct intel_crtc *crtc = dsb->crtc;
+ struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+ enum pipe pipe = crtc->pipe;
+
+ return DSB_STATUS & I915_READ(DSB_CTRL(pipe, dsb->id));
+}
+
struct intel_dsb *
intel_dsb_get(struct intel_crtc *crtc)
{
--
2.22.0
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