Messages in this thread | | | Subject | Re: [alsa-devel] [RFC PATCH 2/2] ASoC: samsung: Print a one-time message if the snow driver's probe defers | From | Javier Martinez Canillas <> | Date | Thu, 20 Oct 2016 08:37:29 -0300 |
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Hello Sylwester,
On 10/20/2016 08:27 AM, Sylwester Nawrocki wrote: > On 10/20/2016 12:41 PM, Javier Martinez Canillas wrote: >> I see no relevant changes in exynos_defconfig between v4.7..v4.8 and >> also no changes in drivers/Makefile that could cause things to be >> initialized on a different order. > > I remember this > > commit 6eb1c9496b81680f2cd2e0eda06c531317e2e28d > clk: probe common clock drivers earlier > > going in recently, but it's rather dubious it could cause such trouble. >
Yes, I'm aware of this change (and in fact it broke MMC in the Peach Pi Chromebook) but that commit landed in v4.9-rc1, not v4.8.
> Anyway, I'd try to add some debug prints to samsung_i2s_probe() to see > what's the issue with the CPU DAI registration. >
Sure, I'm busy with other stuff now but I'll dig again this next week.
>> But I thought the patches had merits on its own since probe deferral >> can make a driver probe many times and the error logs were noisy. I >> wasn't sure though and that's why are marked as RFC. > > In general I wouldn't be disabling those err logs unless proper > EPROBE_DEFER handling is added on related error paths and we can > differentiate between probe deferral and real unrecoverable errors > and can disable logging only for EPROBE_DEFER cases. >
Yes, the sound core change (patch 1/2) is only for the EPROBE_DEFER path.
>>> As far as the error log is concerned, I would just not print anything >>> in snow_probe() when register_card() returns EPROBE_DEFER. >>> >> >> I believe it may be useful to know that a driver's probe is deferring >> due a missing dependency but have no strong opinion and can remove the >> message. > > I'd rather rely on core code to inform about missing resources when > registering components. Otherwise booting unnecessarily takes more > time when there is more probe deferring logs printed on the console. >
Fair enough.
> > -- > Thanks, > Sylwester >
Best regards, -- Javier Martinez Canillas Open Source Group Samsung Research America
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