linux-kernel - Re: [PATCH 2/4] dmaengine: dw: Add memory bus width verification

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Date: Thu, 18 Apr 2024 12:37:09 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Serge Semin <fancer.lancer@...il.com>
Cc: Viresh Kumar <vireshk@...nel.org>, Vinod Koul <vkoul@...nel.org>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>, dmaengine@...r.kernel.org,
	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
	Viresh Kumar <viresh.kumar@...aro.org>
Subject: Re: [PATCH 2/4] dmaengine: dw: Add memory bus width verification

On Wed, Apr 17, 2024 at 09:52:42PM +0300, Serge Semin wrote:
> On Wed, Apr 17, 2024 at 08:28:06PM +0300, Andy Shevchenko wrote:
> > On Wed, Apr 17, 2024 at 08:13:59PM +0300, Serge Semin wrote:

..

> > Got it. Maybe a little summary in the code to explain all this magic?
> 
> Will it be enough to add something like this:
> /*
>  * It's possible to have a data portion locked in the DMA FIFO in case
>  * of the channel suspension. Subsequent channel disabling will cause
>  * that data silent loss. In order to prevent that maintain the src
>  * and dst transfer widths coherency by means of the relation:
>  * (CTLx.SRC_TR_WIDTH * CTLx.SRC_MSIZE >= CTLx.DST_TR_WIDTH)
>  */

Yes, and you may add something like
"Look for the details in the commit message that brings this change."
at the end of it.

-- 
With Best Regards,
Andy Shevchenko