Messages in this thread | | | Date | Fri, 16 Oct 2020 12:12:22 +0100 | From | Sudeep Holla <> | Subject | Re: [PATCH V2 1/2] opp: Allow dev_pm_opp_get_opp_table() to return -EPROBE_DEFER |
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On Fri, Oct 16, 2020 at 07:00:21AM +0100, Sudeep Holla wrote: > On Fri, Oct 16, 2020 at 09:54:34AM +0530, Viresh Kumar wrote: > > On 15-10-20, 19:05, Sudeep Holla wrote: > > > OK, this breaks with SCMI which doesn't provide clocks but manage OPPs > > > directly. Before this change clk_get(dev..) was allowed to fail and > > > --EPROBE_DEFER was not an error. > > > > I think the change in itself is fine. We should be returning from > > there if we get EPROBE_DEFER. The question is rather why are you > > getting EPROBE_DEFER here ? > > > > Ah OK, I didn't spend too much time, saw -EPROBE_DEFER, just reverted > this patch and it worked. I need to check it in detail yet. >
You confused me earlier. As I said there will be no clock provider registered for SCMI CPU/Dev DVFS. opp_table->clk = clk_get(dev, NULL); will always return -EPROBE_DEFER as there is no clock provider for dev. But this change now propagates that error to caller of dev_pm_opp_add which means we can't add opp to a device if there are no clock providers. This breaks for DVFS which don't operate separately with clocks and regulators.
-- Regards, Sudeep
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