[PATCH] drm/xe/pm: add debug logs for D3cold

[Rodrigo Vivi]

On Tue, Feb 06, 2024 at 02:14:18PM +0530, Nilawar, Badal wrote:
> 
> 
> On 06-02-2024 11:29, Riana Tauro wrote:
> > add additional debug logs for PME# capability and
> ^Add
> > presence of ACPI _PR3 resources. This is to identify
> > the reason why the card is not capable of D3cold.

good idea! Thanks for taking care of that.

> > 
> > No functional changes
> > 
> > Signed-off-by: Riana Tauro <riana.tauro at intel.com>
> Reviewed-by: Badal Nilawar <badal.nilawar at intel.com>

thanks for reviewing

and pushed to drm-xe-next

> > ---
> >   drivers/gpu/drm/xe/xe_pm.c | 19 +++++++++++++------
> >   1 file changed, 13 insertions(+), 6 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/xe/xe_pm.c b/drivers/gpu/drm/xe/xe_pm.c
> > index d5f219796d7e..3d55ff77f7c3 100644
> > --- a/drivers/gpu/drm/xe/xe_pm.c
> > +++ b/drivers/gpu/drm/xe/xe_pm.c
> > @@ -125,17 +125,26 @@ int xe_pm_resume(struct xe_device *xe)
> >   	return 0;
> >   }
> > -static bool xe_pm_pci_d3cold_capable(struct pci_dev *pdev)
> > +static bool xe_pm_pci_d3cold_capable(struct xe_device *xe)
> >   {
> > +	struct pci_dev *pdev = to_pci_dev(xe->drm.dev);
> >   	struct pci_dev *root_pdev;
> >   	root_pdev = pcie_find_root_port(pdev);
> >   	if (!root_pdev)
> >   		return false;
> > -	/* D3Cold requires PME capability and _PR3 power resource */
> > -	if (!pci_pme_capable(root_pdev, PCI_D3cold) || !pci_pr3_present(root_pdev))
> > +	/* D3Cold requires PME capability */
> > +	if (!pci_pme_capable(root_pdev, PCI_D3cold)) {
> > +		drm_dbg(&xe->drm, "d3cold: PME# not supported\n");
> >   		return false;
> > +	}
> > +
> > +	/* D3Cold requires _PR3 power resource */
> > +	if (!pci_pr3_present(root_pdev)) {
> > +		drm_dbg(&xe->drm, "d3cold: ACPI _PR3 not present\n");
> > +		return false;
> > +	}
> >   	return true;
> >   }
> > @@ -171,15 +180,13 @@ void xe_pm_init_early(struct xe_device *xe)
> >   void xe_pm_init(struct xe_device *xe)
> >   {
> > -	struct pci_dev *pdev = to_pci_dev(xe->drm.dev);
> > -
> >   	/* For now suspend/resume is only allowed with GuC */
> >   	if (!xe_device_uc_enabled(xe))
> >   		return;
> >   	drmm_mutex_init(&xe->drm, &xe->d3cold.lock);
> > -	xe->d3cold.capable = xe_pm_pci_d3cold_capable(pdev);
> > +	xe->d3cold.capable = xe_pm_pci_d3cold_capable(xe);
> >   	if (xe->d3cold.capable) {
> >   		xe_device_sysfs_init(xe);