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drm/i915/gen9: Add HDC_CHICKEN1 to HW whitelist

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Required for WaAllowUMDToModifyHDCChicken1:skl,bxt

This register is added to HW whitelist to support WA required for future
enabling of pre-emptive command execution, WA implementation will be in
userspace and it cannot program this register if it is not on HW whitelist.

v2: explain purpose of changes (Chris)

Reviewed-by: Nick Hoath <nicholas.hoath@intel.com>
Signed-off-by: Arun Siluvery <arun.siluvery@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1453412634-29238-4-git-send-email-arun.siluvery@linux.intel.com
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Arun Siluvery 2016-01-21 21:43:49 +00:00 committed by Daniel Vetter
parent e0f3fa096d
commit 3669ab6191
2 changed files with 7 additions and 0 deletions
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2
drivers/gpu/drm/i915/i915_reg.h
View file

@ -6045,6 +6045,8 @@ enum skl_disp_power_wells {
#define HDC_FORCE_NON_COHERENT (1<<4)
#define HDC_BARRIER_PERFORMANCE_DISABLE (1<<10)
#define GEN8_HDC_CHICKEN1 _MMIO(0x7304)
/* GEN9 chicken */
#define SLICE_ECO_CHICKEN0 _MMIO(0x7308)
#define PIXEL_MASK_CAMMING_DISABLE (1 << 14)

5
drivers/gpu/drm/i915/intel_ringbuffer.c
View file

@ -986,6 +986,11 @@ static int gen9_init_workarounds(struct intel_engine_cs *ring)
if (ret)
return ret;
/* WaAllowUMDToModifyHDCChicken1:skl,bxt */
ret = wa_ring_whitelist_reg(ring, GEN8_HDC_CHICKEN1);
if (ret)
return ret;
return 0;
}