Re: [PATCH v2 2/6] drm/i915/pm: Hoist pci_save_state()+pci_set_power_state() to the end of pm _late() hook

[Rodrigo Vivi <rodrigo.vivi@intel.com>]

On Tue, Mar 11, 2025 at 09:56:20PM +0200, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> 
> drivers/pci does the pci_save_state()+pci_set_power_state() from
> the _noirq() pm hooks. Move our manual calls (needed for the
> hibernate vs. D3 workaround with buggy BIOSes) towards that same
> point. We currently have no _noirq() hooks, so end of _late()
> hooks is the best we can do right now.

fair enough, let's just get CI back and try it again there

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>


> 
> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/i915_driver.c | 19 ++++++++++++++-----
>  1 file changed, 14 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c
> index be232caef9df..e06f2956382c 100644
> --- a/drivers/gpu/drm/i915/i915_driver.c
> +++ b/drivers/gpu/drm/i915/i915_driver.c
> @@ -1045,7 +1045,6 @@ 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;
> -	struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
>  	pci_power_t opregion_target_state;
>  
>  	disable_rpm_wakeref_asserts(&dev_priv->runtime_pm);
> @@ -1059,8 +1058,6 @@ static int i915_drm_suspend(struct drm_device *dev)
>  		intel_display_driver_disable_user_access(display);
>  	}
>  
> -	pci_save_state(pdev);
> -
>  	intel_display_driver_suspend(display);
>  
>  	intel_irq_suspend(dev_priv);
> @@ -1117,10 +1114,16 @@ static int i915_drm_suspend_late(struct drm_device *dev, bool hibernation)
>  		drm_err(&dev_priv->drm, "Suspend complete failed: %d\n", ret);
>  		intel_display_power_resume_early(display);
>  
> -		goto out;
> +		goto fail;
>  	}
>  
> +	enable_rpm_wakeref_asserts(rpm);
> +
> +	if (!dev_priv->uncore.user_forcewake_count)
> +		intel_runtime_pm_driver_release(rpm);
> +
>  	pci_disable_device(pdev);
> +
>  	/*
>  	 * During hibernation on some platforms the BIOS may try to access
>  	 * the device even though it's already in D3 and hang the machine. So
> @@ -1132,11 +1135,17 @@ static int i915_drm_suspend_late(struct drm_device *dev, bool hibernation)
>  	 * Lenovo Thinkpad X301, X61s, X60, T60, X41
>  	 * Fujitsu FSC S7110
>  	 * Acer Aspire 1830T
> +	 *
> +	 * pci_save_state() prevents drivers/pci from
> +	 * automagically putting the device into D3.
>  	 */
> +	pci_save_state(pdev);
>  	if (!(hibernation && GRAPHICS_VER(dev_priv) < 6))
>  		pci_set_power_state(pdev, PCI_D3hot);
>  
> -out:
> +	return 0;
> +
> +fail:
>  	enable_rpm_wakeref_asserts(rpm);
>  	if (!dev_priv->uncore.user_forcewake_count)
>  		intel_runtime_pm_driver_release(rpm);
> -- 
> 2.45.3
>