linux-kernel - Re: [PATCH 1/3] drm/panthor: Fix runtime suspend sequence after OPP transition error

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Message-ID: <ZwmzHj1CJMQVAyun@e110455-lin.cambridge.arm.com>
Date: Sat, 12 Oct 2024 00:22:06 +0100
From: Liviu Dudau <liviu.dudau@....com>
To: Adrián Larumbe <adrian.larumbe@...labora.com>
Cc: Boris Brezillon <boris.brezillon@...labora.com>,
	Steven Price <steven.price@....com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	kernel@...labora.com, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] drm/panthor: Fix runtime suspend sequence after OPP
 transition error

On Fri, Oct 11, 2024 at 11:56:59PM +0100, Adrián Larumbe wrote:
> In case an OPP transition to a suspension state fails during the runtime
> PM suspend call, if the driver's subsystems were successfully resumed,
> we should return -EAGAIN so that the device's runtime PM status remains
> 'active'.
> 
> If FW reload failed, then we should fall through, so that the PM core
> can flag the device as having suffered a runtime error.
> 
> Signed-off-by: Adrián Larumbe <adrian.larumbe@...labora.com>

Acked-by: Liviu Dudau <liviu.dudau@....com> for this patch. For the other two
I would like first if we try to understand why the suspend does not happen
quick enough (or at all).

Best regards,
Liviu

> ---
>  drivers/gpu/drm/panthor/panthor_device.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panthor/panthor_device.c b/drivers/gpu/drm/panthor/panthor_device.c
> index 4082c8f2951d..cedd3cbcb47d 100644
> --- a/drivers/gpu/drm/panthor/panthor_device.c
> +++ b/drivers/gpu/drm/panthor/panthor_device.c
> @@ -528,8 +528,13 @@ int panthor_device_suspend(struct device *dev)
>  		    drm_dev_enter(&ptdev->base, &cookie)) {
>  			panthor_gpu_resume(ptdev);
>  			panthor_mmu_resume(ptdev);
> -			drm_WARN_ON(&ptdev->base, panthor_fw_resume(ptdev));
> -			panthor_sched_resume(ptdev);
> +			ret = panthor_fw_resume(ptdev);
> +			if (!ret) {
> +				panthor_sched_resume(ptdev);
> +				ret = -EAGAIN;
> +			} else {
> +				drm_err(&ptdev->base, "FW resume failed at runtime suspend: %d\n", ret);
> +			}
>  			drm_dev_exit(cookie);
>  		}
>  
> -- 
> 2.46.2
> 

-- 
====================
| I would like to |
| fix the world,  |
| but they're not |
| giving me the   |
 \ source code!  /
  ---------------
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