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

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Date:   Mon, 19 Sep 2022 22:40:51 +0000
From:   Leo Li <leoyang.li@....com>
To:     Sean Anderson <sean.anderson@...o.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



> -----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?

Regards,
Leo