linux-kernel - Re: [PATCH v14 14/14] drm/msm/dp: set self refresh aware based on PSR support

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Date:   Sun, 26 Mar 2023 09:35:56 -0700
From:   Bjorn Andersson <andersson@...nel.org>
To:     Vinod Polimera <quic_vpolimer@...cinc.com>
Cc:     dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, robdclark@...il.com,
        dianders@...omium.org, swboyd@...omium.org,
        quic_kalyant@...cinc.com, dmitry.baryshkov@...aro.org,
        quic_khsieh@...cinc.com, quic_vproddut@...cinc.com,
        quic_bjorande@...cinc.com, quic_abhinavk@...cinc.com,
        quic_sbillaka@...cinc.com
Subject: Re: [PATCH v14 14/14] drm/msm/dp: set self refresh aware based on
 PSR support

On Sun, Mar 26, 2023 at 09:27:23AM -0700, Bjorn Andersson wrote:
> On Thu, Mar 02, 2023 at 10:03:17PM +0530, Vinod Polimera wrote:
> > For the PSR to kick in, self_refresh_aware has to be set.
> > Initialize it based on the PSR support for the eDP interface.
> > 
> 
> When I boot my sc8280xp devices (CRD and X13s) to console with this
> patch included I get a login prompt, and then there are no more screen
> updates.
> 
> Switching virtual terminal (ctrl+alt+fN) causes the screen to redraw.
> 
> Blindly login in and launching Wayland works and from then on screen
> updates works as expected.
> 
> Switching from Wayland to another virtual terminal causes the problem to
> re-appear, no updates after the initial refresh, switching back go the
> Wayland-terminal crashed the machine.
> 

Also, trying to bring the eDP-screen back from DPMS gives me:

<3>[ 2355.218099] [drm:dp_catalog_ctrl_set_pattern_state_bit [msm]] *ERROR* set state_bit for link_train=1 failed
<3>[ 2355.218926] [drm:dp_ctrl_setup_main_link [msm]] *ERROR* link training #1 failed. ret=-110
<3>[ 2355.262859] [drm:dp_catalog_ctrl_set_pattern_state_bit [msm]] *ERROR* set state_bit for link_train=1 failed
<3>[ 2355.263600] [drm:dp_ctrl_setup_main_link [msm]] *ERROR* link training #1 failed. ret=-110
<3>[ 2355.305211] [drm:dp_catalog_ctrl_set_pattern_state_bit [msm]] *ERROR* set state_bit for link_train=1 failed
<3>[ 2355.305955] [drm:dp_ctrl_setup_main_link [msm]] *ERROR* link training #1 failed. ret=-110
<3>[ 2355.345250] [drm:dp_catalog_ctrl_set_pattern_state_bit [msm]] *ERROR* set state_bit for link_train=1 failed
<3>[ 2355.346026] [drm:dp_ctrl_setup_main_link [msm]] *ERROR* link training #1 failed. ret=-110
<3>[ 2355.405650] [drm:dp_display_process_hpd_high [msm]] *ERROR* failed to complete DP link training
<3>[ 2355.668988] [drm:dpu_encoder_phys_vid_wait_for_commit_done:488] [dpu error]vblank timeout
<3>[ 2355.669030] [drm:dpu_kms_wait_for_commit_done:510] [dpu error]wait for commit done returned -110
<3>[ 2355.699989] [drm:dpu_encoder_frame_done_timeout:2398] [dpu error]enc35 frame done timeout

And then the machine just resets.

Regards,
Bjorn

> 
> 
> Reverting this single patch resolves both the issue with the console
> updating as exected and flipping between the virtual terminal with
> Wayland and the others no longer crashes my machine.
> 
> Regards,
> Bjorn
> 
> > Signed-off-by: Vinod Polimera <quic_vpolimer@...cinc.com>
> > ---
> >  drivers/gpu/drm/msm/dp/dp_drm.c | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/msm/dp/dp_drm.c b/drivers/gpu/drm/msm/dp/dp_drm.c
> > index 029e08c..785d766 100644
> > --- a/drivers/gpu/drm/msm/dp/dp_drm.c
> > +++ b/drivers/gpu/drm/msm/dp/dp_drm.c
> > @@ -117,6 +117,8 @@ static int edp_bridge_atomic_check(struct drm_bridge *drm_bridge,
> >  	if (WARN_ON(!conn_state))
> >  		return -ENODEV;
> >  
> > +	conn_state->self_refresh_aware = dp->psr_supported;
> > +
> >  	if (!conn_state->crtc || !crtc_state)
> >  		return 0;
> >  
> > -- 
> > 2.7.4
> >