linux-kernel - Re: Regression: memory corruption on Atmel SAMA5D31

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Message-ID: <9104267f-6dd5-4e49-6a81-f377edceffe9@microchip.com>
Date:   Wed, 13 Jul 2022 16:01:19 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <peda@...ntia.se>, <regressions@...mhuis.info>,
        <Nicolas.Ferre@...rochip.com>, <alexandre.belloni@...tlin.com>
CC:     <du@...ntia.se>, <Patrice.Vilchez@...rochip.com>,
        <Cristian.Birsan@...rochip.com>, <Ludovic.Desroches@...rochip.com>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <gregkh@...uxfoundation.org>, <saravanak@...gle.com>
Subject: Re: Regression: memory corruption on Atmel SAMA5D31

Hi, Peter,

Thanks for the patience. I was still out of office last week,
but now I have some news.

On 6/27/22 19:53, Tudor.Ambarus@...rochip.com wrote:
> I think these are the last less invasive
> changes that I try, I'll have to rewrite the logic anyway.

I've chopped the driver to use virt-dma (check [1]). It's not clean, but
it works and one can see how the logic is changed. Unfortunately the mem
corruption is still present on high loads. Maybe it's a coherency problem.
I need more time on it. Will get back to you.

Cheers,
ta

[1] To github.com:ambarus/linux-0day.git
   a7351e6f4c12..1557e0df0fd0  at-hdmac-virt-dma -> at-hdmac-virt-dma