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

[Rodrigo Vivi]

It seems this quirk is randomly masking the real issue.

On Wed, Aug 16, 2017 at 12:35 PM, Manasi Navare
<manasi.d.navare at intel.com> wrote:
> 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 at intel.com>
>> Cc: Clinton Taylor <clinton.a.taylor at intel.com>
>> Cc: Daniel Vetter <daniel.vetter at intel.com>
>> Cc: Tomi Sarvela <tomi.p.sarvela at 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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-- 
Rodrigo Vivi
Blog: http://blog.vivi.eng.br