Bspec says that we need to set this: vol1c.3 "Blitter Command
Streamer", Section 1.1.2.1 "GAB_CTL_REG - GAB Unit Control Register".
We don't really rely on pagefaults, but who knows what this all
affects.
Reviewed-by: Ben Widawsky <ben at bwidawsk.net>
Signed-Off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
drivers/gpu/drm/i915/i915_gem.c | 7 ++++++-
drivers/gpu/drm/i915/i915_reg.h | 3 +++
2 files changed, 9 insertions(+), 1 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 4c65c63..5e0d7d4 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3787,7 +3787,12 @@ void i915_gem_init_ppgtt(struct drm_device *dev)
pd_offset <<= 16;
if (INTEL_INFO(dev)->gen == 6) {
- uint32_t ecochk = I915_READ(GAM_ECOCHK);
+ uint32_t ecochk, gab_ctl;
+
+ gab_ctl = I915_READ(GAB_CTL);
+ I915_WRITE(GAB_CTL, gab_ctl | GAB_CTL_CONT_AFTER_PAGEFAULT);
+
+ ecochk = I915_READ(GAM_ECOCHK);
I915_WRITE(GAM_ECOCHK, ecochk | ECOCHK_SNB_BIT |
ECOCHK_PPGTT_CACHE64B);
I915_WRITE(GFX_MODE, GFX_MODE_ENABLE(GFX_PPGTT_ENABLE));
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 3689812..9aeee7a 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -125,6 +125,9 @@
#define ECOCHK_PPGTT_CACHE64B (0x3<<3)
#define ECOCHK_PPGTT_CACHE4B (0x0<<3)
+#define GAB_CTL 0x24000
+#define GAB_CTL_CONT_AFTER_PAGEFAULT (1<<8)
+
/* VGA stuff */
#define VGA_ST01_MDA 0x3ba
--
1.7.7.6
