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drm/i915: set w/a bit for snb pagefaults

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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@bwidawsk.net>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Daniel Vetter 2012-04-11 20:42:39 +02:00
parent de4a8bd162
commit be901a5a1b
2 changed files with 9 additions and 1 deletions
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7
drivers/gpu/drm/i915/i915_gem.c
View File

@ -3669,7 +3669,12 @@ 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));

3
drivers/gpu/drm/i915/i915_reg.h
View File

@ -127,6 +127,9 @@
#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