linux-kernel - Re: [PATCH v4 1/8] drm/nouveau: Fix bogus drm_kms_helper_poll

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Message-ID: <20180802191047.GA6180@wunner.de>
Date:   Thu, 2 Aug 2018 21:10:47 +0200
From:   Lukas Wunner <lukas@...ner.de>
To:     Lyude Paul <lyude@...hat.com>
Cc:     nouveau@...ts.freedesktop.org,
        Peter Ujfalusi <peter.ujfalusi@...com>, stable@...r.kernel.org,
        Ben Skeggs <bskeggs@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/8] drm/nouveau: Fix bogus
 drm_kms_helper_poll_enable() placement

Hi Lyude,

thanks a lot for your persistence in attacking these runtime PM
issues in nouveau.  v4 of this series looks very good overall.
I only have comments on patches 1, 2 and 8.  On this patch 1
it's merely a nit:

On Wed, Aug 01, 2018 at 05:14:51PM -0400, Lyude Paul wrote:
> --- a/drivers/gpu/drm/nouveau/nouveau_drm.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
> @@ -835,7 +835,6 @@ nouveau_pmops_runtime_suspend(struct device *dev)
>  		return -EBUSY;
>  	}
>  
> -	drm_kms_helper_poll_disable(drm_dev);
>  	nouveau_switcheroo_optimus_dsm();
>  	ret = nouveau_do_suspend(drm_dev, true);
>  	pci_save_state(pdev);

This third hunk in the patch lacks an explanation in the commit message.
I think its rationale is that drm_kms_helper_poll_disable() is already
invoked in nouveau_display_fini(), which gets called on ->runtime_suspend,
hence need not be invoked once more in nouveau_pmops_runtime_suspend().

Thanks,

Lukas