Re: [PATCH 2/4] drm/{i915,xe}: move intel_opregion_suspend() to intel_display_driver_pm_suspend_late()

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

On Tue, Sep 22, 2026 at 06:00:50PM +0300, Jani Nikula wrote:
> Try to unify the suspend paths and behaviour by moving the
> intel_opregion_suspend() calls to
> intel_display_driver_pm_suspend_late().
> 
> This is a change in the suspend sequences. The idea behind adding this
> to intel_display_driver_pm_suspend_late() is primarily based on not
> having to pass the s2idle parameter to more functions than that.

Imo the main reason is that it should be called with interrupts
disabled. At least not sure how cancel_work_sync(asle_work) could work
otherwise.

> This also changes behaviour for i915 hibernation, going for PCI_D3cold
> instead of PCI_D1 on hibernate. It's probably the correct thing to do
> anyway, I don't think it should matter all that much, but fingers
> crossed.

I think it is PCI_D3cold for i915 already before this patch, since
acpi_target_system_state() is ACPI_STATE_S4 in that case. If so, the
hibernation param from i915_drm_suspend_late() could be also removed.
But need to check this more to be sure.

> 
> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_display_driver.c | 2 ++
>  drivers/gpu/drm/i915/i915_driver.c                  | 4 ----
>  drivers/gpu/drm/xe/display/xe_display.c             | 3 ---
>  3 files changed, 2 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display_driver.c b/drivers/gpu/drm/i915/display/intel_display_driver.c
> index 77009dca7d0d..abab457bce3a 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_driver.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_driver.c
> @@ -783,6 +783,8 @@ void intel_display_driver_pm_suspend_late(struct intel_display *display, bool s2
>  	if (!HAS_DISPLAY(display))
>  		return;
>  
> +	intel_opregion_suspend(display, s2idle ? PCI_D1 : PCI_D3cold);

This leaves intel_opregion_resume() called from
intel_display_driver_pm_resume() in an assymetric way, but I suppose
that could be addressed later:

Reviewed-by: Imre Deak <imre.deak@intel.com>

> +
>  	intel_display_power_suspend_late(display, s2idle);
>  }
>  
> diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c
> index 9e047c27a153..293099fe6639 100644
> --- a/drivers/gpu/drm/i915/i915_driver.c
> +++ b/drivers/gpu/drm/i915/i915_driver.c
> @@ -1075,7 +1075,6 @@ static int i915_drm_suspend(struct drm_device *dev)
>  {
>  	struct drm_i915_private *dev_priv = to_i915(dev);
>  	struct intel_display *display = dev_priv->display;
> -	pci_power_t opregion_target_state;
>  
>  	disable_rpm_wakeref_asserts(&dev_priv->runtime_pm);
>  
> @@ -1089,9 +1088,6 @@ static int i915_drm_suspend(struct drm_device *dev)
>  
>  	i9xx_display_sr_save(display);
>  
> -	opregion_target_state = suspend_to_idle(dev_priv) ? PCI_D1 : PCI_D3cold;
> -	intel_opregion_suspend(display, opregion_target_state);
> -
>  	dev_priv->suspend_count++;
>  
>  	enable_rpm_wakeref_asserts(&dev_priv->runtime_pm);
> diff --git a/drivers/gpu/drm/xe/display/xe_display.c b/drivers/gpu/drm/xe/display/xe_display.c
> index 184a5a237880..b013ec00b75d 100644
> --- a/drivers/gpu/drm/xe/display/xe_display.c
> +++ b/drivers/gpu/drm/xe/display/xe_display.c
> @@ -246,14 +246,11 @@ static bool suspend_to_idle(void)
>  void xe_display_pm_suspend(struct xe_device *xe)
>  {
>  	struct intel_display *display = xe->display;
> -	bool s2idle = suspend_to_idle();
>  
>  	if (!xe->info.probe_display)
>  		return;
>  
>  	intel_display_driver_pm_suspend(display);
> -
> -	intel_opregion_suspend(display, s2idle ? PCI_D1 : PCI_D3cold);
>  }
>  
>  void xe_display_pm_suspend_late(struct xe_device *xe)
> -- 
> 2.47.3
>