From: Deepak S <deepak.s@xxxxxxxxx>
On VLV, FIFO will be shared by both SW and HW. So, we read the
free entries through register and update dev_priv variable
and wait for only 20 entries to be free
v2: Apply mask when we read the number of free FIFO entries (Ville).
v3: Mask applied after reading the register (Deepak).
Signed-off-by: Deepak S <deepak.s@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_uncore.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index 0db5472..b7dec19 100644
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -150,6 +150,13 @@ static int __gen6_gt_wait_for_fifo(struct drm_i915_private *dev_priv)
{
int ret = 0;
+ /* On VLV, FIFO will be shared by both SW and HW.
+ * So, we need to read the FREE_ENTRIES everytime */
+ if (IS_VALLEYVIEW(dev_priv->dev))
+ dev_priv->uncore.fifo_count =
+ __raw_i915_read32(dev_priv, GTFIFOCTL) &
+ GT_FIFO_FREE_ENTRIES_MASK;
+
if (dev_priv->uncore.fifo_count < GT_FIFO_NUM_RESERVED_ENTRIES) {
int loop = 500;
u32 fifo = __raw_i915_read32(dev_priv, GTFIFOCTL) & GT_FIFO_FREE_ENTRIES_MASK;
--
1.8.4.2
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