[PATCH 4/6] drm/i915/pm: Move the hibernate+D3 quirk stuff into noirq() pm hooks

[Bjorn Helgaas]

On Wed, Sep 25, 2024 at 05:45:24PM +0300, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> If the driver doesn't call pci_save_state() driver/pci will
> normally save+power manage the device from the _noirq() pm
> hooks.

drivers/pci.  Or maybe just mention the PM hook names specifically.

> We can't let that happen as some old BIOSes fail to hibernate
> when the device is in D3. However, we can get a bit closer to
> the standard behaviour by doing our explicit pci_save_state()
> and pci_set_power_state() stuff from driver provided _noirq()
> hooks as well.
> 
> This results in a change of behaviur where we no longer go
> into D3 at the end of .freeze_late(), so when it comes time
> to .thaw() we'll already be in D0, and thus we can drop the
> explicit pci_set_power_state(D0) call.

s/behaviur/behaviour/

> Presumable swictcheroo suspend will want to go into D3 so
> call the _noirq() stuff from the switcheroo suspend hook,
> and since we dropped the pci_set_power_state(D0) from
> .resume_early() we'll need to add one back into the
> swtcheroo resume hook.

s/swictcheroo/switcheroo/
s/swtcheroo/switcheroo/

Or maybe just use the actual function names here too.  That saves
time for me, at least, because it points me at exactly where to look.

Bjorn