[Intel-gfx] [PATCH 1/2] drm/i915: Implement WaDisableVFclkgate.

[Rodrigo Vivi]

On Sat, Dec 16, 2017 at 12:11:16AM +0000, Rafael Antognolli wrote:
> This workaround supposedly fixes some hangs in the VF unit.
> 
> Signed-off-by: Rafael Antognolli <rafael.antognolli at intel.com>
> Reviewed-by: Lucas De Marchi <lucas.demarchi at intel.com>

Both patches merged to dinq. Thanks for patches and reviews.

> ---
>  drivers/gpu/drm/i915/i915_reg.h | 3 +++
>  drivers/gpu/drm/i915/intel_pm.c | 5 +++++
>  2 files changed, 8 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 09bf043c1c2e..a9a6d6698bb1 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -3875,6 +3875,9 @@ enum {
>  #define  SARBUNIT_CLKGATE_DIS		(1 << 5)
>  #define  RCCUNIT_CLKGATE_DIS		(1 << 7)
>  
> +#define UNSLICE_UNIT_LEVEL_CLKGATE	_MMIO(0x9434)
> +#define  VFUNIT_CLKGATE_DIS		(1 << 20)
> +
>  /*
>   * Display engine regs
>   */
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index a349c4fd51ff..e33842d6bb14 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -8448,6 +8448,11 @@ static void cnl_init_clock_gating(struct drm_i915_private *dev_priv)
>  	if (IS_CNL_REVID(dev_priv, CNL_REVID_A0, CNL_REVID_B0))
>  		val |= SARBUNIT_CLKGATE_DIS;
>  	I915_WRITE(SLICE_UNIT_LEVEL_CLKGATE, val);
> +
> +	/* WaDisableVFclkgate:cnl */
> +	val = I915_READ(UNSLICE_UNIT_LEVEL_CLKGATE);
> +	val |= VFUNIT_CLKGATE_DIS;
> +	I915_WRITE(UNSLICE_UNIT_LEVEL_CLKGATE, val);
>  }
>  
>  static void cfl_init_clock_gating(struct drm_i915_private *dev_priv)
> -- 
> 2.14.3
> 
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