linux-kernel - Re: [PATCH v2 1/4] soundwire: bus: suppress probe deferral errors

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Date: Tue, 4 Jun 2024 11:09:28 +0200
From: Johan Hovold <johan@...nel.org>
To: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc: Johan Hovold <johan+linaro@...nel.org>, Vinod Koul <vkoul@...nel.org>,
	Bard Liao <yung-chuan.liao@...ux.intel.com>,
	Sanyog Kale <sanyog.r.kale@...el.com>, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/4] soundwire: bus: suppress probe deferral errors

On Tue, Jun 04, 2024 at 10:30:21AM +0200, Pierre-Louis Bossart wrote:
> On 6/4/24 02:52, Johan Hovold wrote:
> > Soundwire driver probe errors are currently being logged both by the bus
> > code and driver core:
> > 
> > 	wsa884x-codec sdw:4:0:0217:0204:00:0: Probe of wsa884x-codec failed: -12
> > 	wsa884x-codec sdw:4:0:0217:0204:00:0: probe with driver wsa884x-codec failed with error -12
> > 
> > Drop the redundant bus error message, which is also incorrectly being
> > logged on probe deferral:
> 
> It's only redundant in the QCOM case... This would remove all error logs
> for other codecs, e.g. see
> 
> rt711_sdca_sdw_probe
> cs35l56_sdw_probe
> wcd9390_probe
> 
> Looks like the wsa884x-codec is the chatty driver, others are just fine
> with the existing code.

I believe you misunderstood this patch. The error messages above are not
printed by the wsa884x-codec driver, but by the soundwire bus code and
driver core, so the redundant error message will be printed for all
codecs on probe failures.

And specifically, driver core will still log probe failures after this
change.

Johan