Re: [PATCH] drm/i915/edp: Increase T12 panel delay to 900 ms to fix DP AUX CH timeouts

[Manasi Navare <manasi.d.navare@intel.com>]

Hi Daniel/Clint,

Could you review this one, we need this patch to get pushed
to drm-tip so that we can see if SKL 6700hq is stable with this patch.
Thanks a lot in advanvce!

Regards
Manasi

On Tue, Aug 15, 2017 at 11:59:51AM -0700, Manasi Navare wrote:
> This patch fixes the DP AUX CH timeouts observed during CI runs causing
> CI Failures on a specific PCI device. This issue was fixed previously
> by adding a quirk but looks like we need to increase this delay even more
> in order to get rid all the DP AUX CH timeouts.
> 
> Fixes: c99a259b4b5192ba ("drm/i915/edp: Add a T12 panel delay quirk to fix
> DP AUX CH timeouts")
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101144
> Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> Cc: Clinton Taylor <clinton.a.taylor@intel.com>
> Cc: Daniel Vetter <daniel.vetter@intel.com>
> Cc: Tomi Sarvela <tomi.p.sarvela@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_dp.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 5ba8366..c4d8afa 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -5246,7 +5246,7 @@ intel_dp_init_panel_power_sequencer(struct drm_device *dev,
>  	 * seems sufficient to avoid this problem.
>  	 */
>  	if (dev_priv->quirks & QUIRK_INCREASE_T12_DELAY) {
> -		vbt.t11_t12 = max_t(u16, vbt.t11_t12, 800 * 10);
> +		vbt.t11_t12 = max_t(u16, vbt.t11_t12, 900 * 10);
>  		DRM_DEBUG_KMS("Increasing T12 panel delay as per the quirk to %d\n",
>  			      vbt.t11_t12);
>  	}
> -- 
> 2.1.4
> 
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