linux-kernel - Re: [BUG] ls1046a: eDMA does not transfer data from I2C

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Message-ID: <9fc5afd3-7595-fc56-9b7e-209b0b08036a@seco.com>
Date:   Mon, 19 Sep 2022 18:45:13 -0400
From:   Sean Anderson <sean.anderson@...o.com>
To:     Leo Li <leoyang.li@....com>,
        Oleksij Rempel <linux@...pel-privat.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Vinod Koul <vkoul@...nel.org>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>
Cc:     Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König <christian.koenig@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linaro-mm-sig@...ts.linaro.org" <linaro-mm-sig@...ts.linaro.org>,
        Joy Zou <joy.zou@....com>, Shawn Guo <shawnguo@...nel.org>
Subject: Re: [BUG] ls1046a: eDMA does not transfer data from I2C



On 9/19/22 6:40 PM, Leo Li wrote:
> 
> 
>> -----Original Message-----
>> From: Sean Anderson <sean.anderson@...o.com>
>> Sent: Monday, September 19, 2022 5:24 PM
>> To: Oleksij Rempel <linux@...pel-privat.de>; Pengutronix Kernel Team
>> <kernel@...gutronix.de>; linux-i2c@...r.kernel.org; linux-arm-kernel
>> <linux-arm-kernel@...ts.infradead.org>; Vinod Koul <vkoul@...nel.org>;
>> dmaengine@...r.kernel.org
>> Cc: Sumit Semwal <sumit.semwal@...aro.org>; Christian König
>> <christian.koenig@....com>; Linux Kernel Mailing List <linux-
>> kernel@...r.kernel.org>; linux-media@...r.kernel.org; dri-
>> devel@...ts.freedesktop.org; linaro-mm-sig@...ts.linaro.org; Joy Zou
>> <joy.zou@....com>; Peng Ma <peng.ma@....com>; Robin Gong
>> <yibin.gong@....com>; Shawn Guo <shawnguo@...nel.org>; Leo Li
>> <leoyang.li@....com>
>> Subject: [BUG] ls1046a: eDMA does not transfer data from I2C
>> 
>> Hi all,
>> 
>> I discovered a bug in either imx_i2c or fsl-edma on the LS1046A where no
>> data is read in i2c_imx_dma_read except for the last two bytes (which are
>> not read using DMA). This is perhaps best illustrated with the following
>> example:
> 
> What is the kernel tree/tag that you are testing with?

5.15.40

Sorry, I forgot to put that in the first email. I can test with
linux/master, but I reviewed the different commits and I did not think
there would be any difference. I also cherry-picked the eDMA memcpy
commit, but the dma test passed.

--Sean