[Intel-gfx] [PATCH v3] drm/i915/rpm: Enable runtime pm autosuspend by default

[Gupta, Anshuman]

> -----Original Message-----
> From: Tangudu, Tilak <tilak.tangudu at intel.com>
> Sent: Tuesday, November 16, 2021 9:23 PM
> To: intel-gfx at lists.freedesktop.org; dri-devel at lists.freedesktop.org
> Cc: Tangudu, Tilak <tilak.tangudu at intel.com>; Ewins, Jon
> <jon.ewins at intel.com>; Vivi, Rodrigo <rodrigo.vivi at intel.com>; Nilawar, Badal
> <badal.nilawar at intel.com>; Gupta, Anshuman <anshuman.gupta at intel.com>;
> Syrjala, Ville <ville.syrjala at intel.com>
> Subject: [PATCH v3] drm/i915/rpm: Enable runtime pm autosuspend by default
> 
> v1: Enable runtime pm autosuspend by default for Gen12 and later versions.
> 
> v2: Enable runtime pm autosuspend by default for all platforms(Syrjala Ville)
> 
> v3: Change commit message(Nikula Jani)
> Let's enable runtime pm autosuspend by default everywhere.
> So, we can allow D3hot and bigger power savings on idle scenarios.
> 
> But at this time let's not touch the autosuspend_delay time, what caused some
> regression on our previous attempt.
> 
> Also, the latest identified issue on GuC PM has been fixed by commit
> 1a52faed3131 ("drm/i915/guc: Take GT PM ref when deregistering
> context")
> 
> Signed-off-by: Tilak Tangudu <tilak.tangudu at intel.com>
> ---
>  drivers/gpu/drm/i915/intel_runtime_pm.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c
> b/drivers/gpu/drm/i915/intel_runtime_pm.c
> index 0d85f3c5c526..22dab36afcb6 100644
> --- a/drivers/gpu/drm/i915/intel_runtime_pm.c
> +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
> @@ -590,6 +590,9 @@ void intel_runtime_pm_enable(struct intel_runtime_pm
> *rpm)
>  		pm_runtime_use_autosuspend(kdev);
>  	}
> 
> +	/* Enable by default */
> +	pm_runtime_allow(kdev);
> +
BAT is failing due to soft lockup on SKL.
How about to enable the runtime PM only for discrete platforms till we fixes all issues on Gen9 for hybrid gfx use cases.
(when discrete card will used only for rendering)
Thanks,
Anshuman Gupta.
>  	/*
>  	 * The core calls the driver load handler with an RPM reference held.
>  	 * We drop that here and will reacquire it during unloading in
> --
> 2.25.1