linux-kernel - Re: [PATCH] i2c: mpc: Restore reread of I2C status register

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Date:   Fri, 2 Jul 2021 09:53:08 +0200
From:   Wolfram Sang <wsa@...nel.org>
To:     Chris Packham <chris.packham@...iedtelesis.co.nz>
Cc:     linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i2c: mpc: Restore reread of I2C status register

On Fri, Jul 02, 2021 at 03:27:24PM +1200, Chris Packham wrote:
> Prior to commit 1538d82f4647 ("i2c: mpc: Interrupt driven transfer") the
> old interrupt handler would reread MPC_I2C_SR after checking the CSR_MIF
> bit. When the driver was re-written this was removed as it seemed
> unnecessary. However as it turns out this is necessary for i2c devices
> which do clock stretching otherwise we end up thinking the bus is still
> busy when processing the interrupt.
> 
> Fixes: 1538d82f4647 ("i2c: mpc: Interrupt driven transfer")
> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>

Applied to for-current, thanks!


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