linux-kernel - Re: [Intel-gfx] [PATCH 7/7] drm/i915: Merge FDI RX reg writes during training

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Date:	Fri, 17 Aug 2012 18:14:50 +0100
From:	"Lespiau, Damien" <damien.lespiau@...el.com>
To:	Keith Packard <keithp@...thp.com>
Cc:	intel-gfx@...ts.freedesktop.org,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [Intel-gfx] [PATCH 7/7] drm/i915: Merge FDI RX reg writes during training

On Tue, Aug 14, 2012 at 5:34 AM, Keith Packard <keithp@...thp.com> wrote:
> @@ -2324,6 +2324,8 @@ static void intel_fdi_normal_train(struct drm_crtc *crtc)
>                 temp |= FDI_LINK_TRAIN_NONE | FDI_TX_ENHANCE_FRAME_ENABLE;
>         }
>         I915_WRITE(reg, temp);
> +       POSTING_READ(reg);
> +       udelay(100);

The docs don't mention a delay between writing the TX and RX training
patterns, the POSTING_READ() seems like a good idea.

>         reg = FDI_RX_CTL(pipe);
>         temp = I915_READ(reg);
> @@ -2334,16 +2336,15 @@ static void intel_fdi_normal_train(struct drm_crtc *crtc)
>                 temp &= ~FDI_LINK_TRAIN_NONE;
>                 temp |= FDI_LINK_TRAIN_NONE;
>         }
> +       /* IVB wants error correction enabled */
> +       if (IS_IVYBRIDGE(dev))
> +               temp |= FDI_FS_ERRC_ENABLE | FDI_FE_ERRC_ENABLE;
> +
>         I915_WRITE(reg, temp | FDI_RX_ENHANCE_FRAME_ENABLE);
>
>         /* wait one idle pattern time */
>         POSTING_READ(reg);
>         udelay(1000);
> -
> -       /* IVB wants error correction enabled */
> -       if (IS_IVYBRIDGE(dev))
> -               I915_WRITE(reg, I915_READ(reg) | FDI_FS_ERRC_ENABLE |
> -                          FDI_FE_ERRC_ENABLE);
>  }
>
>  static void cpt_phase_pointer_enable(struct drm_device *dev, int pipe)

Reviewed-by: Damien Lespiau <damien.lespiau@...el.com>

-- 
Damien
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