Re: [PATCH RESEND 08/10] drm/msm: Sprinkle pm_runtime calls around

[Sean Paul <seanpaul-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>]

On Thu, Mar 08, 2018 at 04:14:38PM -0800, Jeykumar Sankaran wrote:
> On 2018-02-21 07:18, Sean Paul wrote:
> > Adding missing pm_runtime references where appropriate.
> > 
> > Signed-off-by: Sean Paul <seanpaul@chromium.org>
> > ---
> >  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c |  3 +++
> >  drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c  | 10 +++++++++-
> >  2 files changed, 12 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> > b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> > index f1642d72469e..df6cbeb15cf5 100644
> > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> > @@ -3497,6 +3497,7 @@ static void dpu_crtc_disable(struct drm_crtc
> > *crtc)
> >  	/* disable clk & bw control until clk & bw properties are set */
> >  	cstate->bw_control = false;
> >  	cstate->bw_split_vote = false;
> > +	pm_runtime_put_sync(crtc->dev->dev);
> > 
> >  	mutex_unlock(&dpu_crtc->crtc_lock);
> >  }
> > @@ -3523,6 +3524,8 @@ static void dpu_crtc_enable(struct drm_crtc *crtc,
> >  	DPU_EVT32_VERBOSE(DRMID(crtc));
> >  	dpu_crtc = to_dpu_crtc(crtc);
> > 
> > +	pm_runtime_get_sync(crtc->dev->dev);
> > +
> >  	drm_for_each_encoder(encoder, crtc->dev) {
> >  		if (encoder->crtc != crtc)
> >  			continue;
> > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> > b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> > index fb4de59d8ed1..b919c9a6a463 100644
> > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> > @@ -114,6 +114,7 @@ static int _dpu_danger_signal_status(struct seq_file
> > *s,
> >  	priv = kms->dev->dev_private;
> >  	memset(&status, 0, sizeof(struct dpu_danger_safe_status));
> > 
> > +	pm_runtime_get_sync(kms->dev->dev);
> >  	dpu_power_resource_enable(&priv->phandle, kms->core_client, true);
> >  	if (danger_status) {
> >  		seq_puts(s, "\nDanger signal status:\n");
> > @@ -127,6 +128,7 @@ static int _dpu_danger_signal_status(struct seq_file
> > *s,
> >  					&status);
> >  	}
> >  	dpu_power_resource_enable(&priv->phandle, kms->core_client, false);
> > +	pm_runtime_put_sync(kms->dev->dev);
> > 
> >  	seq_printf(s, "MDP     :  0x%x\n", status.mdp);
> > 
> > @@ -346,12 +348,14 @@ static void _dpu_debugfs_destroy(struct dpu_kms
> > *dpu_kms)
> > 
> >  static int dpu_kms_enable_vblank(struct msm_kms *kms, struct drm_crtc
> > *crtc)
> >  {
> > +	pm_runtime_get_sync(crtc->dev->dev);
> >  	return dpu_crtc_vblank(crtc, true);
> >  }
> > 
> >  static void dpu_kms_disable_vblank(struct msm_kms *kms, struct drm_crtc
> > *crtc)
> >  {
> >  	dpu_crtc_vblank(crtc, false);
> > +	pm_runtime_put_sync(crtc->dev->dev);
> >  }
> > 
> >  static void dpu_kms_wait_for_frame_transfer_complete(struct msm_kms
> > *kms,
> > @@ -413,6 +417,7 @@ static void dpu_kms_prepare_commit(struct msm_kms
> > *kms,
> >  	if (!dev || !dev->dev_private)
> >  		return;
> >  	priv = dev->dev_private;
> > +	pm_runtime_get_sync(dev->dev);
> 
> CONFIG_DEBUG_FS is not enabled yet. Do we need this change here? If yes, we
> need
> to add pm_runtime calls in other files as well e.g:
> sde_plane_danger_read/write in dpu_plane.c.

Hmm, yeah good catch. Aside from the question of debugfs (which I think we
should probably do a deep review of what's being exposed), perhaps we should
move the pm_runtime_(get|put)_sync calls in dpu_power_resource_enable, then we
don't need to worry about adding the calls everywhere.

Thoughts?

Sean


> 
> >  	dpu_power_resource_enable(&priv->phandle, dpu_kms->core_client, true);
> > 
> >  	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
> > @@ -471,6 +476,7 @@ static void dpu_kms_complete_commit(struct msm_kms
> > *kms,
> >  	}
> > 
> >  	dpu_power_resource_enable(&priv->phandle, dpu_kms->core_client,
> > false);
> > +	pm_runtime_put_sync(dpu_kms->dev->dev);
> > 
> >  	DPU_EVT32_VERBOSE(DPU_EVTLOG_FUNC_EXIT);
> >  }
> > @@ -1896,7 +1902,7 @@ static int dpu_kms_hw_init(struct msm_kms *kms)
> >  		dpu_kms->core_client = NULL;
> >  		goto error;
> >  	}
> > -
> > +	pm_runtime_get_sync(dev->dev);
> >  	rc = dpu_power_resource_enable(&priv->phandle, dpu_kms->core_client,
> >  		true);
> >  	if (rc) {
> > @@ -2030,6 +2036,7 @@ static int dpu_kms_hw_init(struct msm_kms *kms)
> >  			dpu_kms_handle_power_event, dpu_kms, "kms");
> > 
> >  	dpu_power_resource_enable(&priv->phandle, dpu_kms->core_client,
> > false);
> > +	pm_runtime_put_sync(dev->dev);
> > 
> >  	return 0;
> > 
> > @@ -2039,6 +2046,7 @@ static int dpu_kms_hw_init(struct msm_kms *kms)
> >  perf_err:
> >  power_error:
> >  	dpu_power_resource_enable(&priv->phandle, dpu_kms->core_client,
> > false);
> > +	pm_runtime_put_sync(dev->dev);
> >  error:
> >  	_dpu_kms_hw_destroy(dpu_kms, platformdev);
> >  end:
> 
> -- 
> Jeykumar S

-- 
Sean Paul, Software Engineer, Google / Chromium OS
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