Re: [Intel-gfx] [PATCH 4/4] drm/i915/opregion: Register/unregister opregion on platforms without display

[Imre Deak <imre.deak@intel.com>]

On Tue, Mar 07, 2023 at 10:50:49AM +0200, Jani Nikula wrote:
> On Tue, 21 Feb 2023, Imre Deak <imre.deak@intel.com> wrote:
> > Call the opregion register/unregister functions during driver
> > loading/unloading on !HAS_DISPLAY platforms. These functions will send
> > the opregion adapter power state notifications which is required on all
> > platforms (similarly how this is sent during runtime and system
> > suspend/resume). Skip registering the ACPI video notifier callback on
> > !HAS_DISPLAY, where the corresponding video extensions are not
> > supported.
> 
> I think the direction should be towards better separation of display
> code, and this patch is counter productive. Basically we shouldn't
> require calling display functions on !HAS_DISPLAY, and the early return
> is what we should do.

Ok, missed this point.

> This, in turn, means we probably need to handle opregion differently. :(
> 
> Dunno, maybe we need to move opregion under soc/ and have parts called
> by high level driver code, and some other parts from display code.

Yes, I think we can be sure that some part of the opregion i/f is not
display-only (VRAM SR), so makes sense, though it's a bigger change. I think
the following instead of patch 4 would be more in line with what you said
above:

diff --git a/drivers/gpu/drm/i915/display/intel_opregion.c b/drivers/gpu/drm/i915/display/intel_opregion.c
index b7973a05d022d..abfe1615afb06 100644
--- a/drivers/gpu/drm/i915/display/intel_opregion.c
+++ b/drivers/gpu/drm/i915/display/intel_opregion.c
@@ -1155,8 +1155,6 @@ void intel_opregion_register(struct drm_i915_private *i915)
 			intel_opregion_video_event;
 		register_acpi_notifier(&opregion->acpi_notifier);
 	}
-
-	intel_opregion_resume(i915);
 }
 
 static void intel_opregion_resume_display(struct drm_i915_private *i915)
@@ -1228,8 +1226,6 @@ void intel_opregion_unregister(struct drm_i915_private *i915)
 {
 	struct intel_opregion *opregion = &i915->display.opregion;
 
-	intel_opregion_suspend(i915, PCI_D1);
-
 	if (!opregion->header)
 		return;
 
diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c
index 8f5e3ded52233..c554495d4f8e1 100644
--- a/drivers/gpu/drm/i915/i915_driver.c
+++ b/drivers/gpu/drm/i915/i915_driver.c
@@ -633,6 +633,8 @@ static void i915_driver_register(struct drm_i915_private *dev_priv)
 
 	intel_display_driver_register(dev_priv);
 
+	intel_opregion_resume(i915);
+
 	intel_power_domains_enable(dev_priv);
 	intel_runtime_pm_enable(&dev_priv->runtime_pm);
 
@@ -658,6 +660,8 @@ static void i915_driver_unregister(struct drm_i915_private *dev_priv)
 	intel_runtime_pm_disable(&dev_priv->runtime_pm);
 	intel_power_domains_disable(dev_priv);
 
+	intel_opregion_suspend(i915, PCI_D1);
+
 	intel_display_driver_unregister(dev_priv);
 
 	intel_pxp_fini(dev_priv);

> BR,
> Jani.
> 
> 
> >
> > Signed-off-by: Imre Deak <imre.deak@intel.com>
> > ---
> >  drivers/gpu/drm/i915/display/intel_display.c  | 11 +++++++----
> >  drivers/gpu/drm/i915/display/intel_opregion.c |  2 +-
> >  2 files changed, 8 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> > index 7827ef3e2d1e6..467f6e2376057 100644
> > --- a/drivers/gpu/drm/i915/display/intel_display.c
> > +++ b/drivers/gpu/drm/i915/display/intel_display.c
> > @@ -8882,11 +8882,12 @@ bool intel_modeset_probe_defer(struct pci_dev *pdev)
> >  
> >  void intel_display_driver_register(struct drm_i915_private *i915)
> >  {
> > -	if (!HAS_DISPLAY(i915))
> > -		return;
> > -
> >  	/* Must be done after probing outputs */
> >  	intel_opregion_register(i915);
> > +
> > +	if (!HAS_DISPLAY(i915))
> > +		return;
> > +
> >  	intel_acpi_video_register(i915);
> >  
> >  	intel_audio_init(i915);
> > @@ -8914,7 +8915,7 @@ void intel_display_driver_register(struct drm_i915_private *i915)
> >  void intel_display_driver_unregister(struct drm_i915_private *i915)
> >  {
> >  	if (!HAS_DISPLAY(i915))
> > -		return;
> > +		goto unregister_opregion;
> >  
> >  	intel_fbdev_unregister(i915);
> >  	intel_audio_deinit(i915);
> > @@ -8928,6 +8929,8 @@ void intel_display_driver_unregister(struct drm_i915_private *i915)
> >  	drm_atomic_helper_shutdown(&i915->drm);
> >  
> >  	acpi_video_unregister();
> > +
> > +unregister_opregion:
> >  	intel_opregion_unregister(i915);
> >  }
> >  
> > diff --git a/drivers/gpu/drm/i915/display/intel_opregion.c b/drivers/gpu/drm/i915/display/intel_opregion.c
> > index b7973a05d022d..37098e7f607e6 100644
> > --- a/drivers/gpu/drm/i915/display/intel_opregion.c
> > +++ b/drivers/gpu/drm/i915/display/intel_opregion.c
> > @@ -1150,7 +1150,7 @@ void intel_opregion_register(struct drm_i915_private *i915)
> >  	if (!opregion->header)
> >  		return;
> >  
> > -	if (opregion->acpi) {
> > +	if (HAS_DISPLAY(i915) && opregion->acpi) {
> >  		opregion->acpi_notifier.notifier_call =
> >  			intel_opregion_video_event;
> >  		register_acpi_notifier(&opregion->acpi_notifier);
> 
> -- 
> Jani Nikula, Intel Open Source Graphics Center