Re: drm/msm: 'pp done time out' errors after async commit changes

[Brian Masney <masneyb-1iNe0GrtECGEi8DpZVb4nw@public.gmane.org>]

On Mon, Nov 11, 2019 at 07:51:22AM -0700, Jeffrey Hugo wrote:
> On Mon, Nov 11, 2019 at 4:38 AM Brian Masney <masneyb@onstation.org> wrote:
> >
> > On Sun, Nov 10, 2019 at 10:37:33AM -0700, Jeffrey Hugo wrote:
> > > On Sun, Nov 10, 2019 at 6:53 AM Brian Masney <masneyb@onstation.org> wrote:
> > > >
> > > > On Fri, Nov 08, 2019 at 07:56:25AM -0700, Jeffrey Hugo wrote:
> > > > There's a REG_MDP5_PP_AUTOREFRESH_CONFIG() macro upstream here:
> > > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/msm/disp/mdp5/mdp5.xml.h#n1383
> > > >
> > > > I'm not sure what to put in that register but I tried configuring it
> > > > with a 1 this way and still have the same issue.
> > > >
> > > > diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_cmd_encoder.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_cmd_encoder.c
> > > > index eeef41fcd4e1..6b9acf68fd2c 100644
> > > > --- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_cmd_encoder.c
> > > > +++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_cmd_encoder.c
> > > > @@ -80,6 +80,7 @@ static int pingpong_tearcheck_setup(struct drm_encoder *encoder,
> > > >         mdp5_write(mdp5_kms, REG_MDP5_PP_SYNC_THRESH(pp_id),
> > > >                         MDP5_PP_SYNC_THRESH_START(4) |
> > > >                         MDP5_PP_SYNC_THRESH_CONTINUE(4));
> > > > +       mdp5_write(mdp5_kms, REG_MDP5_PP_AUTOREFRESH_CONFIG(pp_id), 1);
> > > >
> > > >         return 0;
> > > >  }
> > >
> > > bit 31 is the enable bit (set that to 1), bits 15:0 are the
> > > frame_count (how many te events before the MDP sends a frame, I'd
> > > recommend set to 1).  Then after its programmed, you'll have to flush
> > > the config, and probably use a _START to make sure the flush takes
> > > effect.
> >
> > I think that I initially get autorefresh enabled based on your
> > description above since the ping pong IRQs occur much more frequently.
> > However pretty quickly the error 'dsi_err_worker: status=c' is shown,
> > the contents on the screen shift to the right, and the screen no longer
> > updates after that. That error decodes to
> > DSI_ERR_STATE_DLN0_PHY | DSI_ERR_STATE_FIFO according to dsi_host.c.
> >
> > Here's the relevant code that I have so far:
> 
> So, Unless I missed it, you haven't disabled using _start when
> autorefresh is enabled.  If you are using both at the same time,
> you'll overload the DSI and get those kinds of errors.

That fixed the issue. Just to close out this thread, I submitted a
patch with what I have here:
https://lore.kernel.org/lkml/20191112104854.20850-1-masneyb@onstation.org/T/#u

I'll work on async commit support for the MDP5.

Thanks Jeff and Rob!

Brian
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