linux-kernel - Re: [PATCH 3/4] soundwire: debugfs: Switch to sdw_read_no

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Date:   Tue, 15 Nov 2022 10:14:41 +0000
From:   Charles Keepax <ckeepax@...nsource.cirrus.com>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
CC:     <vkoul@...nel.org>, <yung-chuan.liao@...ux.intel.com>,
        <sanyog.r.kale@...el.com>, <alsa-devel@...a-project.org>,
        <linux-kernel@...r.kernel.org>, <patches@...nsource.cirrus.com>
Subject: Re: [PATCH 3/4] soundwire: debugfs: Switch to sdw_read_no_pm

On Mon, Nov 14, 2022 at 10:14:19AM -0600, Pierre-Louis Bossart wrote:
> 
> 
> On 11/14/22 04:29, Charles Keepax wrote:
> > It is rather inefficient to be constantly enabling/disabling the PM
> > runtime as we print out each individual register, switch to holding a PM
> > runtime reference across the whole register output.
> 
> the change is good, but technically the pm_runtime resume happens for
> the first read and suspend with a delay if use_autosuspend() is enabled,
> so presumably we'll see the same number of resume/suspend with the
> existing code and the suggested change.
> 
> Maybe update the commit message to mention that we constantly change
> reference counts, as you did in the next patch?

Yeah agree, I will respin the commit message.

Thanks,
Charles