linux-kernel - Re: [PATCH v2] i2c: designware: Fix corrupted memory seen in the ISR

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Date:   Wed, 20 Sep 2023 11:08:01 +0200
From:   Wolfram Sang <wsa@...nel.org>
To:     Serge Semin <fancer.lancer@...il.com>
Cc:     Jan Bottorff <janb@...amperecomputing.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Yann Sionneau <ysionneau@...rayinc.com>,
        Yann Sionneau <yann@...nneau.net>,
        Will Deacon <will@...nel.org>,
        Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Jan Dabros <jsd@...ihalf.com>,
        Andi Shyti <andi.shyti@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] i2c: designware: Fix corrupted memory seen in the ISR


> same thread." [1] Thus I'd suggest the next fix for the problem:
> 
> --- a/drivers/i2c/busses/i2c-designware-common.c
> +++ b/drivers/i2c/busses/i2c-designware-common.c
> @@ -72,7 +72,10 @@ static int dw_reg_write(void *context, unsigned int reg, unsigned int val)
>  {
>  	struct dw_i2c_dev *dev = context;
>  
> -	writel_relaxed(val, dev->base + reg);
> +	if (reg == DW_IC_INTR_MASK)
> +		writel(val, dev->base + reg);
> +	else
> +		writel_relaxed(val, dev->base + reg);
>  
>  	return 0;
>  }
> 
> (and similar changes for dw_reg_write_swab() and dw_reg_write_word().)
> 
> What do you think?

To me, this looks reasonable and much more what I would have expected as
a result (from a high level point of view). Let's hope it works. I am
optimistic, though...


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