[Bug 69128] [IVB dp dongle] Aplle miniDP-to-VGA fails link training

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=69128

--- Comment #9 from shui yangwei <yangweix.shui at intel.com> ---
(In reply to comment #7)
> (In reply to comment #6)
> > I fetched intel-dp-fixes branch of this repo to Daniel's tree, then build a
> > kernel, this issue come up again.
> 
> Hmm, please try the below patch on top of:
> 
> > commit c030533419ec5f9ce042bafb6f40368f310181f8
> > Author: Jani Nikula <jani.nikula at intel.com>
> > Date:   Wed Sep 11 14:46:20 2013 +0300
> > 
> >     drm/i915/dp: read DPCD PSR capability only on eDP
> 
> Thanks.
> 
> diff --git a/drivers/gpu/drm/i915/intel_dp.c
> b/drivers/gpu/drm/i915/intel_dp.c
> index 08f9d2d..97063b3 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -677,7 +677,7 @@ intel_dp_i2c_aux_ch(struct i2c_adapter *adapter, int
> mode,
>  			 */
>  			if (intel_dp->dpcd[DP_DOWNSTREAMPORT_PRESENT] &
>  			    DP_DWN_STRM_PORT_PRESENT)
> -				usleep_range(500, 600);
> +				usleep_range(5000, 7000);
>  			else
>  				usleep_range(300, 400);
>  			continue;

Test with this patch, this issue also reproduceable.

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