linux-kernel - Re: [PATCH v4 1/5] PM: domains: Allow devices attached to genpd to be managed by HW

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Date: Tue, 23 Jan 2024 13:53:17 +0100
From: Ulf Hansson <ulf.hansson@...aro.org>
To: Abel Vesa <abel.vesa@...aro.org>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>, Kevin Hilman <khilman@...nel.org>, Pavel Machek <pavel@....cz>, 
	Len Brown <len.brown@...el.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	Bjorn Andersson <andersson@...nel.org>, Andy Gross <agross@...nel.org>, 
	Konrad Dybcio <konrad.dybcio@...aro.org>, Michael Turquette <mturquette@...libre.com>, 
	Stephen Boyd <sboyd@...nel.org>, Stanimir Varbanov <stanimir.k.varbanov@...il.com>, 
	Vikash Garodia <quic_vgarodia@...cinc.com>, "Bryan O'Donoghue" <bryan.odonoghue@...aro.org>, 
	Mauro Carvalho Chehab <mchehab@...nel.org>, Taniya Das <quic_tdas@...cinc.com>, 
	Jagadeesh Kona <quic_jkona@...cinc.com>, Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, 
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org, 
	linux-media@...r.kernel.org
Subject: Re: [PATCH v4 1/5] PM: domains: Allow devices attached to genpd to be
 managed by HW

[...]

> +
> +/**
> + * dev_pm_genpd_get_hwmode - Get the HW mode setting for the device.
> + *
> + * @dev: Device for which the current HW-mode setting should be fetched.
> + *
> + * This helper function allows consumer drivers to fetch the current HW mode
> + * setting of its the device.
> + *
> + * It is assumed that the users guarantee that the genpd wouldn't be detached
> + * while this routine is getting called.
> + */
> +bool dev_pm_genpd_get_hwmode(struct device *dev)
> +{
> +       struct generic_pm_domain *genpd;
> +
> +       genpd = dev_to_genpd_safe(dev);
> +       if (!genpd)
> +               return false;
> +
> +       if (genpd->get_hwmode_dev)
> +               return genpd->get_hwmode_dev(genpd, dev);

Not sure why I haven't spotted this before - but we should probably
assign dev_gpd_data(dev)->hw_mode here, rather than returning the
result from the callback directly.

> +
> +       return dev_gpd_data(dev)->hw_mode;
> +}
> +EXPORT_SYMBOL_GPL(dev_pm_genpd_get_hwmode);

[...]

Kind regards
Uffe