Re: [PATCH v2 03/20] drm/i915: Fix noatomic crtc disabling.

Maarten Lankhorst
2015-07-07T14:14:03Z

Op 07-07-15 om 14:39 schreef Patrik Jakobsson:
> On Tue, Jul 07, 2015 at 12:22:12PM +0200, Maarten Lankhorst wrote:
>> Op 07-07-15 om 11:18 schreef Daniel Vetter:
>>> On Tue, Jul 07, 2015 at 09:08:14AM +0200, Maarten Lankhorst wrote:
>>>> This should fix suspend on newer platforms.
>>> Which patch broke this? Also what is "newer platform" and what exactly got
>>> fixed? Please elaborate a bit more in your commit messages, they're too
>>> terse.
>> There were a lot of warnings about active mismatches and power well not being idle on suspend.
>>
>> This should fix the power well by disabling the shared dpll and unsetting crtc->active.
> This got broken by:
>
> commit eddfcbcdc27fbecb33bff098967bbdd7ca75bfa6
> Author: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Date: Mon Jun 15 12:33:53 2015 +0200
>
> drm/i915: Update less state during modeset.
>
> No need to repeatedly call update_watermarks, or update_fbc.
> Down to a single call to update_watermarks in .crtc_enable
>
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
> Tested-by(IVB): Matt Roper <matthew.d.roper@intel.com>
> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
>
> Unfortunately the patch doesn't fix the CAT_ERR on resume I'm experiencing on
> SKL. An additional intel_update_watermarks() is needed to set DDB back to 0,0.
> Also this is required in *_crtc_disable() since we forget to do the same thing
> there. Not sure we also need to take care of disabling fbc at these places?
I would prefer to have this fix, and leave updating the watermark code out of crtc disable.

Does it work If you add a intel_update_watermarks to the noatomic function?

~Maarten