[Intel-gfx] [PATCH] drm/i915: Flush using only the correct base address register

[Paulo Zanoni]

Hi

2012/10/29 Damien Lespiau <damien.lespiau at gmail.com>:
> From: Damien Lespiau <damien.lespiau at intel.com>
>
> We were writing DSP_ADDR and DSP_SURF unconditionally. This did not
> trigger an unclaimed write before HSW as the address of DSP_ADDR has
> been repurposed as DSP_LINOFF.
>
> On HSW, though, DSP_LINOFF has been removed and then writting to it
> triggers an unclaimed write.
>
> This patch writes to DSP_ADDR or DSP_SURF to flush the display plane
> configuration depending on the gen we're running on.
>
> Signed-off-by: Damien Lespiau <damien.lespiau at intel.com>

Looks correct.

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

> ---
>  drivers/gpu/drm/i915/intel_display.c |    6 ++++--
>  1 files changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index a038e4f..f32244b 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -1836,8 +1836,10 @@ static void intel_disable_pipe(struct drm_i915_private *dev_priv,
>  void intel_flush_display_plane(struct drm_i915_private *dev_priv,
>                                       enum plane plane)
>  {
> -       I915_WRITE(DSPADDR(plane), I915_READ(DSPADDR(plane)));
> -       I915_WRITE(DSPSURF(plane), I915_READ(DSPSURF(plane)));
> +       if (dev_priv->info->gen >= 4)
> +               I915_WRITE(DSPSURF(plane), I915_READ(DSPSURF(plane)));
> +       else
> +               I915_WRITE(DSPADDR(plane), I915_READ(DSPADDR(plane)));
>  }
>
>  /**
> --
> 1.7.7.5
>
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-- 
Paulo Zanoni