linux-kernel - Re: [PATCH 09/11] soundwire: intel: add dynamic debug trace for clock-stop invalid configs

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Message-ID: <20200829110047.GC2639@vkoul-mobl>
Date:   Sat, 29 Aug 2020 16:30:47 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Bard Liao <yung-chuan.liao@...ux.intel.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        tiwai@...e.de, broonie@...nel.org, gregkh@...uxfoundation.org,
        jank@...ence.com, srinivas.kandagatla@...aro.org,
        rander.wang@...ux.intel.com, ranjani.sridharan@...ux.intel.com,
        hui.wang@...onical.com, sanyog.r.kale@...el.com,
        mengdong.lin@...el.com, bard.liao@...el.com
Subject: Re: [PATCH 09/11] soundwire: intel: add dynamic debug trace for
 clock-stop invalid configs

On 28-08-20, 09:54, Pierre-Louis Bossart wrote:
> 
> > > > > Detect cases where the clock is assumed to be stopped but the IP is
> > > > > not in the relevant state, and add a dynamic debug trace.
> > > > 
> > > > you meant a debug print..and it looks like error print below (also in title).
> > > 
> > > I don't understand the comment. Is the 'trace' confusing and are you asking
> > > to e.g. change the commit message to 'add dynamic debug log'?
> > 
> > Question is what is dynamic about this?
> dev_dbg() is part of the kernel dynamic debug capability...
> 
> https://www.kernel.org/doc/html/latest/admin-guide/dynamic-debug-howto.html
> 
> Not sure what you are asking here?

:-| where is dev_dbg() ?

See [1]

On 18-08-20, 10:41, Bard Liao wrote:
> From: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
> 
> Detect cases where the clock is assumed to be stopped but the IP is
> not in the relevant state, and add a dynamic debug trace.
> 
> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
> Signed-off-by: Bard Liao <yung-chuan.liao@...ux.intel.com>
> ---
>  drivers/soundwire/intel.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c
> index 7c63581270fd..b82d02af3c4f 100644
> --- a/drivers/soundwire/intel.c
> +++ b/drivers/soundwire/intel.c
> @@ -1964,6 +1964,11 @@ static int intel_resume_runtime(struct device *dev)
>  			}
>  		}
>  	} else if (!clock_stop_quirks) {
> +
> +		clock_stop0 = sdw_cdns_is_clock_stop(&sdw->cdns);
> +		if (!clock_stop0)

[1]

> +			dev_err(dev, "%s invalid configuration, clock was not stopped", __func__);

                        ^^^^^^^

> +
>  		ret = intel_init(sdw);
>  		if (ret) {
>  			dev_err(dev, "%s failed: %d", __func__, ret);
> -- 
> 2.17.1


-- 
~Vinod