linux-kernel - Re: (subset) [PATCH v3 1/1] i2c: lpi2c: Avoid calling clk_get

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Date: Tue, 23 Apr 2024 00:51:17 +0200
From: Andi Shyti <andi.shyti@...nel.org>
To: Dong Aisheng <aisheng.dong@....com>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, Fabio Estevam <festevam@...il.com>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Alexander Stein <alexander.stein@...tq-group.com>
Cc: NXP Linux Team <linux-imx@....com>, linux-i2c@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, 
 Uwe Kleine-König <u.kleine-koenig@...gutronix.de>, 
 imx@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: (subset) [PATCH v3 1/1] i2c: lpi2c: Avoid calling clk_get_rate
 during transfer

Hi

On Mon, 22 Apr 2024 13:36:29 +0200, Alexander Stein wrote:
> Instead of repeatedly calling clk_get_rate for each transfer, lock
> the clock rate and cache the value.
> A deadlock has been observed while adding tlv320aic32x4 audio codec to
> the system. When this clock provider adds its clock, the clk mutex is
> locked already, it needs to access i2c, which in return needs the mutex
> for clk_get_rate as well.
> 
> [...]

Applied to i2c/i2c-host on

git://git.kernel.org/pub/scm/linux/kernel/git/andi.shyti/linux.git

Thank you,
Andi

Patches applied
===============
[1/1] i2c: lpi2c: Avoid calling clk_get_rate during transfer
      commit: 7ec84d4d55504710a828047d079cb22f12d4133f