linux-kernel - Re: dmaengine: fsl-edma: dmatest timeout

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Message-ID: <ZWZiY4Cy/GP8L+Px@lizhi-Precision-Tower-5810>
Date:   Tue, 28 Nov 2023 16:57:55 -0500
From:   Frank Li <Frank.li@....com>
To:     wangxiaolei <xiaolei.wang@...driver.com>
Cc:     vkoul@...nel.org, imx@...ts.linux.dev, dmaengine@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: dmaengine: fsl-edma: dmatest timeout

On Tue, Nov 28, 2023 at 10:38:41AM -0500, Frank Li wrote:
> On Tue, Nov 28, 2023 at 12:43:59PM +0800, wangxiaolei wrote:
> > Hi
> > 
> > When I executed the following command to do dmatest on the imx8qm platform,
> > 
> > I found that the timeout occurred on the current mainline kernel:
> > 
> > 
> > modprobe dmatest run=1 iterations=42
> > 
> 
> dmatest use mem to mem transfer. It seldom used at actual system. Let me
> check it. 
> 
> Frank
> 
> > 
> > I found that the completion interrupt was not received in
> > fsl_edma3_tx_handler().

I test at imx93, it works. I supposed it is the same as 8qm.

echo dma0chan0 > /sys/module/dmatest/parameters/channel
echo 2000 > /sys/module/dmatest/parameters/timeout
echo 1 > /sys/module/dmatest/parameters/iterations
echo 1 > /sys/module/dmatest/parameters/run

I add debug message: 

[  154.090765] fsl_edma_tx_chan_handler
[  154.094711] fsl_edma_prep_memcpy 8d842340 8d839280 7104
[  154.100063] fsl_edma_tx_chan_handler
[  154.103949] fsl_edma_prep_memcpy 8d8419c0 8d838580 4288
[  154.109265] fsl_edma_tx_chan_handler
[  154.113235] fsl_edma_prep_memcpy 8d840ec0 8d838340 6016
[  154.118573] fsl_edma_tx_chan_handler
[  154.122508] fsl_edma_prep_memcpy 8d841c00 8d83a8c0 1920
[  154.127791] fsl_edma_tx_chan_handler
[  154.131738] fsl_edma_prep_memcpy 8d840040 8d838200 14784
[  154.137272] fsl_edma_tx_chan_handler
[  154.141171] fsl_edma_prep_memcpy 8d840280 8d838080 15616
[  154.146716] fsl_edma_tx_chan_handler
[  154.150598] fsl_edma_prep_memcpy 8d840e00 8d838f40 4928
[  154.155915] fsl_edma_tx_chan_handler
[  154.159858] fsl_edma_prep_memcpy 8d8419c0 8d838040 7424
[  154.165203] fsl_edma_tx_chan_handler
[  154.169140] fsl_edma_prep_memcpy 8d841700 8d839380 2560

Frank

> > 
> > I didn't find any special configuration from the manual. Can anyone give
> > some suggestions?
> > 
> > 
> > thanks
> > 
> > xiaolei
> >