linux-kernel - Re: [PATCH] soundwire: intel: read AC timing control register before updating it

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Message-ID: <ZHHdvx4cDFIiX27s@matsya>
Date:   Sat, 27 May 2023 16:08:55 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Bard Liao <yung-chuan.liao@...ux.intel.com>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        pierre-louis.bossart@...ux.intel.com, bard.liao@...el.com
Subject: Re: [PATCH] soundwire: intel: read AC timing control register before
 updating it

On 15-05-23, 16:13, Bard Liao wrote:
> From: Chao Song <chao.song@...ux.intel.com>
> 
> Start from ACE1.x, DOAISE is added to AC timing control
> register bit 5, it combines with DOAIS to get effective
> timing, and has the default value 1.
> 
> The current code fills DOAIS, DACTQE and DODS bits to a
> variable initialized to zero, and updates the variable
> to AC timing control register. With this operation, We
> change DOAISE to 0, and force a much more aggressive
> timing. The timing is even unable to form a working
> waveform on SDA pin on Meteorlake.
> 
> This patch uses read-modify-write operation for the AC
> timing control register access, thus makes sure those
> bits not supposed and intended to change are not touched.

Applied, thanks

-- 
~Vinod