From: Deepak S <deepak.s@xxxxxxxxx>
On VLV the PCBR register has other bits besides the pcbr address
field. Verify only address field setup by BIOS to make sure we don't
misinterpret the PCBR setup.
Signed-off-by: Deepak S <deepak.s@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_pm.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index e6d98fe..2e1340f 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4036,7 +4036,12 @@ static void valleyview_setup_pctx(struct drm_device *dev)
int pctx_size = 24*1024;
pcbr = I915_READ(VLV_PCBR);
- if (pcbr) {
+
+ /* PCBR Format: Bits 31:12 - Base address of Process Context
+ * Bits 11:1 - Reserved
+ * Bit 0 - PCBR Lock
+ * Check only address field if already setup by BIOS */
+ if (pcbr >> 12) {
/* BIOS set it up already, grab the pre-alloc'd space */
int pcbr_offset;
--
1.8.4.2
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