linux-kernel - Re: [PATCH] soundwire: intel_auxdevice: add kernel parameter for mclk divider

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Message-ID: <Zv5PDAQjrhfG+78d@vaman>
Date: Thu, 3 Oct 2024 13:30:12 +0530
From: Vinod Koul <vkoul@...nel.org>
To: "Liao, Bard" <bard.liao@...el.com>
Cc: Bard Liao <yung-chuan.liao@...ux.intel.com>,
	"linux-sound@...r.kernel.org" <linux-sound@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"pierre-louis.bossart@...ux.intel.com" <pierre-louis.bossart@...ux.intel.com>
Subject: Re: [PATCH] soundwire: intel_auxdevice: add kernel parameter for
 mclk divider

On 19-08-24, 08:13, Liao, Bard wrote:
> 
> 
> > -----Original Message-----
> > From: Vinod Koul <vkoul@...nel.org>
> > Sent: Sunday, August 18, 2024 3:24 PM
> > To: Bard Liao <yung-chuan.liao@...ux.intel.com>
> > Cc: linux-sound@...r.kernel.org; linux-kernel@...r.kernel.org; pierre-
> > louis.bossart@...ux.intel.com; Liao, Bard <bard.liao@...el.com>
> > Subject: Re: [PATCH] soundwire: intel_auxdevice: add kernel parameter for
> > mclk divider
> > 
> > On 06-08-24, 16:38, Bard Liao wrote:
> > > From: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
> > >
> > > Add a kernel parameter to work-around discrepancies between hardware
> > > and platform firmware, it's not unusual to see e.g. 38.4MHz listed in
> > > _DSD properties as the SoundWire clock source, but the hardware may be
> > > based on a 19.2 MHz mclk source.
> > 
> > I think this should be documented in kernel-parameters.txt?
> 
> The parameter is only needed when a BIOS provides a MCLK rate which
> does not match the actual rate. It is not a normal case and it happens rarely.
> Is it really necessary to be documented in kernel-parameters.txt?

Yes I think so, all of the parameters are supposed to be documented :-)

-- 
~Vinod