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SubjectRe: [PATCH] opp: Return genpd virtual devices from dev_pm_opp_attach_genpd()
On 16-07-19, 12:43, Niklas Cassel wrote:
> On Mon, Jul 08, 2019 at 11:30:11AM +0530, Viresh Kumar wrote:
> > The cpufreq drivers don't need to do runtime PM operations on the
> > virtual devices returned by dev_pm_domain_attach_by_name() and so the
> > virtual devices weren't shared with the callers of
> > dev_pm_opp_attach_genpd() earlier.
> >
> > But the IO device drivers would want to do that. This patch updates the
> > prototype of dev_pm_opp_attach_genpd() to accept another argument to
> > return the pointer to the array of genpd virtual devices.
> >
> > Reported-by: Rajendra Nayak <rnayak@codeaurora.org>
> > Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
> > ---
> > @Rajendra: Can you please test this one ? I have only compile tested it.
> >
> > drivers/opp/core.c | 5 ++++-
> > include/linux/pm_opp.h | 4 ++--
> > 2 files changed, 6 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/opp/core.c b/drivers/opp/core.c
> > index 2958cc7bbb58..07b6f1187b3b 100644
> > --- a/drivers/opp/core.c
> > +++ b/drivers/opp/core.c
> > @@ -1775,6 +1775,7 @@ static void _opp_detach_genpd(struct opp_table *opp_table)
> > * dev_pm_opp_attach_genpd - Attach genpd(s) for the device and save virtual device pointer
> > * @dev: Consumer device for which the genpd is getting attached.
> > * @names: Null terminated array of pointers containing names of genpd to attach.
> > + * @virt_devs: Pointer to return the array of virtual devices.
> > *
> > * Multiple generic power domains for a device are supported with the help of
> > * virtual genpd devices, which are created for each consumer device - genpd
> > @@ -1789,7 +1790,8 @@ static void _opp_detach_genpd(struct opp_table *opp_table)
> > * This helper needs to be called once with a list of all genpd to attach.
> > * Otherwise the original device structure will be used instead by the OPP core.
> > */
> > -struct opp_table *dev_pm_opp_attach_genpd(struct device *dev, const char **names)
> > +struct opp_table *dev_pm_opp_attach_genpd(struct device *dev,
> > + const char **names, struct device ***virt_devs)
> > {
> > struct opp_table *opp_table;
> > struct device *virt_dev;
> > @@ -1850,6 +1852,7 @@ struct opp_table *dev_pm_opp_attach_genpd(struct device *dev, const char **names
> > name++;
> > }
> >
> > + *virt_devs = opp_table->genpd_virt_devs;
>
> Could we perhaps only do this if (virt_devs), that way callers can send in
> NULL if they don't care about the genpd virtual devices.

That was the idea and I failed to add it :(

--
viresh

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