[Intel-gfx] [PATCH 2/2] drm/i915: Remove the WaDisableBackToBackFlipFix w/a for Haswell

[Paulo Zanoni]

2012/10/4 Damien Lespiau <damien.lespiau at gmail.com>:
> From: Damien Lespiau <damien.lespiau at intel.com>
>
> This workaround is only valid for IVB and VLV and the write triggers an
> error on HSW.

In other words: the register does not exist anymore.

It would be nice if we could volunteer someone to check the other
workarounds on the same function. The registers may exist but the WAs
may not be needed anymore.

Reviewed-by: Paulo Zanoni <paulo.r.zanonI at intel.com>

>
> Signed-off-by: Damien Lespiau <damien.lespiau at intel.com>
> Cc: Paulo Zanoni <paulo.r.zanoni at intel.com>
> ---
>  drivers/gpu/drm/i915/intel_pm.c |    4 ----
>  1 files changed, 0 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 3d219ec..d0403e8 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -3479,10 +3479,6 @@ static void haswell_init_clock_gating(struct drm_device *dev)
>         I915_WRITE(_3D_CHICKEN3,
>                    _MASKED_BIT_ENABLE(_3D_CHICKEN_SF_DISABLE_OBJEND_CULL));
>
> -       I915_WRITE(IVB_CHICKEN3,
> -                  CHICKEN3_DGMG_REQ_OUT_FIX_DISABLE |
> -                  CHICKEN3_DGMG_DONE_FIX_DISABLE);
> -
>         /* Apply the WaDisableRHWOOptimizationForRenderHang workaround. */
>         I915_WRITE(GEN7_COMMON_SLICE_CHICKEN1,
>                    GEN7_CSC1_RHWO_OPT_DISABLE_IN_RCC);
> --
> 1.7.7.5
>
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-- 
Paulo Zanoni