Re: [PATCH 1/5] drm/i915: Increase maximum polling time to 50ms for forcewake request/clear ack

Tvrtko Ursulin
2015-09-22T09:06:49Z

On 08/26/2015 10:26 AM, Daniel Vetter wrote:
> On Sun, Aug 23, 2015 at 05:52:47PM +0530, Sagar Arun Kamble wrote:
>> On BXT, We Observe timeout for forcewake request completion with 2ms polling period as given here:
>> [drm:fw_domains_get] ERROR render: timed out waiting for forcewake ack request.
>> Polling for 50ms is recommended to avoid these timeouts.
>>
>> Change-Id: Ie715b0069a3049606e9602bc5e97a6511890864d
>> Signed-off-by: Sagar Arun Kamble <sagar.a.kamble@intel.com>
>
> Probably needs cc: stable plus a pile of bugzilla links all over ...

If the required wait is typically that long, shouldn't we be worried
about busy polling?

Regards,

Tvrtko