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 <[email protected]>
> Reviewed-by: Lucas De Marchi <[email protected]>
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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