an König ;
>>> linaro-mm-...@lists.linaro.org; Shawn Guo ; Sumit
>>> Semwal ; Joy Zou ; linux-
>>> me...@vger.kernel.org
>>> Subject: Re: [BUG] ls1046a: eDMA does not transfer data from I2C
>>>
>>>
>>>
>>> On 9/20/22 11:44 AM
nux-arm-kernel
>> ; Vinod Koul ;
>> dmaeng...@vger.kernel.org; Leo Li ; Laurentiu Tudor
>>
>> Cc: Linux Kernel Mailing List ; dri-
>> de...@lists.freedesktop.org; Christian König ;
>> linaro-mm-...@lists.linaro.org; Shawn Guo ; Sumit
>> Semwal ; Joy Zou ; linux-
>
> >
> > Despite the DMA completing successfully, no data was copied into the
> > buffer, leaving the original (now junk) contents. I probed the I2C bus
> > with an oscilloscope, and I verified that the transfer did indeed occur.
> > The timing between submission and completion seems reasonable for
tiu Tudor
>
> Cc: Linux Kernel Mailing List ; dri-
> de...@lists.freedesktop.org; Christian König ;
> linaro-mm-...@lists.linaro.org; Shawn Guo ; Sumit
> Semwal ; Joy Zou ; linux-
> me...@vger.kernel.org
> Subject: Re: [BUG] ls1046a: eDMA does not transfer data from I2C
>
On 9/20/22 11:44 AM, Sean Anderson wrote:
>
>
> On 9/20/22 11:24 AM, Sean Anderson wrote:
>>
>>
>> On 9/20/22 6:07 AM, Robin Murphy wrote:
>>> On 2022-09-19 23:24, Sean Anderson wrote:
Hi all,
I discovered a bug in either imx_i2c or fsl-edma on the LS1046A where no
data
On 9/20/22 11:24 AM, Sean Anderson wrote:
>
>
> On 9/20/22 6:07 AM, Robin Murphy wrote:
>> On 2022-09-19 23:24, Sean Anderson wrote:
>>> 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
On 9/20/22 6:07 AM, Robin Murphy wrote:
> On 2022-09-19 23:24, Sean Anderson wrote:
>> 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
On 2022-09-19 23:24, Sean Anderson wrote:
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:
# hexdump -C
>> dmaeng...@vger.kernel.org
>> Cc: Sumit Semwal ; Christian König
>> ; Linux Kernel Mailing List > ker...@vger.kernel.org>; linux-me...@vger.kernel.org; dri-
>> de...@lists.freedesktop.org; linaro-mm-...@lists.linaro.org; Joy Zou
>> ; Peng Ma ; Robin Gong
>
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:
# hexdump -C /sys/bus/nvmem/devices/0-00540/nvmem
[
> ; Linux Kernel Mailing List ker...@vger.kernel.org>; linux-me...@vger.kernel.org; dri-
> de...@lists.freedesktop.org; linaro-mm-...@lists.linaro.org; Joy Zou
> ; Peng Ma ; Robin Gong
> ; Shawn Guo ; Leo Li
>
> Subject: [BUG] ls1046a: eDMA does not transfer data from I2C
&
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