[Intel-gfx] [PATCH 2/2] drm/i915/skl: Implement WaDisableVFUnitClockGating

[Rodrigo Vivi]

Reviewed-by: Rodrigo Vivi <rodrigo.vivi at intel.com>

On Thu, Feb 26, 2015 at 10:20 AM, Damien Lespiau
<damien.lespiau at intel.com> wrote:
> Signed-off-by: Damien Lespiau <damien.lespiau at intel.com>
> ---
>  drivers/gpu/drm/i915/i915_reg.h | 1 +
>  drivers/gpu/drm/i915/intel_pm.c | 4 ++++
>  2 files changed, 5 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 55143cb..6849b74 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -6056,6 +6056,7 @@ enum skl_disp_power_wells {
>  # define GEN6_CSUNIT_CLOCK_GATE_DISABLE                        (1 << 7)
>
>  #define GEN6_UCGCTL2                           0x9404
> +# define GEN6_VFUNIT_CLOCK_GATE_DISABLE                        (1 << 31)
>  # define GEN7_VDSUNIT_CLOCK_GATE_DISABLE               (1 << 30)
>  # define GEN7_TDLUNIT_CLOCK_GATE_DISABLE               (1 << 22)
>  # define GEN6_RCZUNIT_CLOCK_GATE_DISABLE               (1 << 13)
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index f11e487..601f43c 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -75,6 +75,10 @@ static void skl_init_clock_gating(struct drm_device *dev)
>                 I915_WRITE(GEN8_UCGCTL6, I915_READ(GEN8_UCGCTL6) |
>                            GEN8_GAPSUNIT_CLOCK_GATE_DISABLE |
>                            GEN8_SDEUNIT_CLOCK_GATE_DISABLE);
> +
> +               /* WaDisableVFUnitClockGating:skl */
> +               I915_WRITE(GEN6_UCGCTL2, I915_READ(GEN6_UCGCTL2) |
> +                          GEN6_VFUNIT_CLOCK_GATE_DISABLE);
>         }
>
>         if (INTEL_REVID(dev) <= SKL_REVID_D0) {
> --
> 1.8.3.1
>
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-- 
Rodrigo Vivi
Blog: http://blog.vivi.eng.br