[Intel-gfx] [PATCH 02/10] drm/i915: don't read DP_TP_STATUS(PORT_A)

[Jani Nikula]

On Fri, 18 Jan 2013, Paulo Zanoni <przanoni at gmail.com> wrote:
> From: Paulo Zanoni <paulo.r.zanoni at intel.com>
>
> Our documentation is wrong, this register does not exist on port A, so
> sleep 800us since it's the timeout mentioned on the mode set sequence
> document.

Would be nice to have some reference, like documentation, to back up the
claim that the documentation is wrong...

Maybe a comment near #define DP_TP_STATUS() in i915_reg.h would be in
order too.

>
> This fixes error messages, including "unclaimed register".
>
> Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
> ---
>  drivers/gpu/drm/i915/intel_dp.c |    9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 1492706..d83c279 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -1788,9 +1788,12 @@ intel_dp_set_link_train(struct intel_dp *intel_dp,
>  			temp |= DP_TP_CTL_LINK_TRAIN_IDLE;
>  			I915_WRITE(DP_TP_CTL(port), temp);
>  
> -			if (wait_for((I915_READ(DP_TP_STATUS(port)) &
> -				      DP_TP_STATUS_IDLE_DONE), 1))
> -				DRM_ERROR("Timed out waiting for DP idle patterns\n");
> +			if (port == PORT_A)
> +				udelay(800);

usleep_range()?

> +			else
> +				if (wait_for((I915_READ(DP_TP_STATUS(port)) &
> +					     DP_TP_STATUS_IDLE_DONE), 1))
> +					DRM_ERROR("Timed out waiting for DP idle patterns\n");
>  
>  			temp &= ~DP_TP_CTL_LINK_TRAIN_MASK;
>  			temp |= DP_TP_CTL_LINK_TRAIN_NORMAL;
> -- 
> 1.7.10.4
>
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