On Bay Trail, bit 1 means "writeable by the GPU." Failing to set that
means basically anything using the GPU will cause hangs.
Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
---
drivers/gpu/drm/i915/i915_gem_gtt.c | 33 +++++++++++++++++++++++++++++++--
1 file changed, 31 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 9db65c1..db5c654 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -75,6 +75,27 @@ static inline gen6_gtt_pte_t gen6_pte_encode(struct drm_device *dev,
return pte;
}
+#define BYT_PTE_WRITEABLE (1 << 1)
+#define BYT_PTE_SNOOPED_BY_CPU_CACHES (1 << 2)
+
+static inline gen6_gtt_pte_t byt_pte_encode(struct drm_device *dev,
+ dma_addr_t addr,
+ enum i915_cache_level level)
+{
+ gen6_gtt_pte_t pte = GEN6_PTE_VALID;
+ pte |= GEN6_PTE_ADDR_ENCODE(addr);
+
+ /* Mark the page as writeable. Other platforms don't have a
+ * setting for read-only/writable, so this matches that behavior.
+ */
+ pte |= BYT_PTE_WRITEABLE;
+
+ if (level != I915_CACHE_NONE)
+ pte |= BYT_PTE_SNOOPED_BY_CPU_CACHES;
+
+ return pte;
+}
+
static int gen6_ppgtt_enable(struct drm_device *dev)
{
drm_i915_private_t *dev_priv = dev->dev_private;
@@ -236,7 +257,11 @@ static int gen6_ppgtt_init(struct i915_hw_ppgtt *ppgtt)
first_pd_entry_in_global_pt =
gtt_total_entries(dev_priv->gtt) - I915_PPGTT_PD_ENTRIES;
- ppgtt->pte_encode = gen6_pte_encode;
+ if (IS_VALLEYVIEW(dev)) {
+ ppgtt->pte_encode = byt_pte_encode;
+ } else {
+ ppgtt->pte_encode = gen6_pte_encode;
+ }
ppgtt->num_pd_entries = I915_PPGTT_PD_ENTRIES;
ppgtt->enable = gen6_ppgtt_enable;
ppgtt->clear_range = gen6_ppgtt_clear_range;
@@ -826,7 +851,11 @@ int i915_gem_gtt_init(struct drm_device *dev)
} else {
dev_priv->gtt.gtt_probe = gen6_gmch_probe;
dev_priv->gtt.gtt_remove = gen6_gmch_remove;
- dev_priv->gtt.pte_encode = gen6_pte_encode;
+ if (IS_VALLEYVIEW(dev)) {
+ dev_priv->gtt.pte_encode = byt_pte_encode;
+ } else {
+ dev_priv->gtt.pte_encode = gen6_pte_encode;
+ }
}
ret = dev_priv->gtt.gtt_probe(dev, &dev_priv->gtt.total,
--
1.8.2.1
