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drm/i915: Implement WaVcpClkGateDisableForMediaReset:ctg, elk 

Apparently we need to disable VCP unit clock gating around media reset
on g4x.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2014-05-19 19:23:27 +03:00 committed by Daniel Vetter
parent 80715b2f7b
commit fa4f53c441
2 changed files with 39 additions and 1 deletions
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4
drivers/gpu/drm/i915/i915_reg.h
View File

@ -1835,6 +1835,10 @@ enum punit_power_well {
#define VF_UNIT_CLOCK_GATE_DISABLE (1 << 9)
#define GS_UNIT_CLOCK_GATE_DISABLE (1 << 7)
#define CL_UNIT_CLOCK_GATE_DISABLE (1 << 6)
#define VDECCLK_GATE_D 0x620C /* g4x only */
#define VCP_UNIT_CLOCK_GATE_DISABLE (1 << 4)
#define RAMCLK_GATE_D 0x6210 /* CRL only */
#define DEUC 0x6214 /* CRL only */

36
drivers/gpu/drm/i915/intel_uncore.c
View File

@ -988,6 +988,36 @@ static int i965_do_reset(struct drm_device *dev)
return 0;
}
static int g4x_do_reset(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
int ret;
pci_write_config_byte(dev->pdev, I965_GDRST,
GRDOM_RENDER | GRDOM_RESET_ENABLE);
ret = wait_for(i965_reset_complete(dev), 500);
if (ret)
return ret;
/* WaVcpClkGateDisableForMediaReset:ctg,elk */
I915_WRITE(VDECCLK_GATE_D, I915_READ(VDECCLK_GATE_D) | VCP_UNIT_CLOCK_GATE_DISABLE);
POSTING_READ(VDECCLK_GATE_D);
pci_write_config_byte(dev->pdev, I965_GDRST,
GRDOM_MEDIA | GRDOM_RESET_ENABLE);
ret = wait_for(i965_reset_complete(dev), 500);
if (ret)
return ret;
/* WaVcpClkGateDisableForMediaReset:ctg,elk */
I915_WRITE(VDECCLK_GATE_D, I915_READ(VDECCLK_GATE_D) & ~VCP_UNIT_CLOCK_GATE_DISABLE);
POSTING_READ(VDECCLK_GATE_D);
pci_write_config_byte(dev->pdev, I965_GDRST, 0);
return 0;
}
static int ironlake_do_reset(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
@ -1040,7 +1070,11 @@ int intel_gpu_reset(struct drm_device *dev)
case 7:
case 6: return gen6_do_reset(dev);
case 5: return ironlake_do_reset(dev);
case 4: return i965_do_reset(dev);
case 4:
if (IS_G4X(dev))
return g4x_do_reset(dev);
else
return i965_do_reset(dev);
default: return -ENODEV;
}
}