shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-06-07 11:26:02 +09:00
Code Issues Packages Projects Releases Wiki Activity

iio: adc: stm32-adc: Use dma_request_chan() instead dma_request_slave_channel()

Browse Source 
[ Upstream commit 735404b846 ]

dma_request_slave_channel() is a wrapper on top of dma_request_chan()
eating up the error code.

By using dma_request_chan() directly the driver can support deferred
probing against DMA.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Peter Ujfalusi
2020-01-08 10:08:01 +02:00
committed by Greg Kroah-Hartman
parent 754254daca
commit cdaedaba68
1 changed files with 14 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/iio/adc/stm32-adc.c
View File

@@ -1688,9 +1688,21 @@ static int stm32_adc_dma_request(struct iio_dev *indio_dev)
struct dma_slave_config config;
int ret;
adc->dma_chan = dma_request_slave_channel(&indio_dev->dev, "rx");
if (!adc->dma_chan)
adc->dma_chan = dma_request_chan(&indio_dev->dev, "rx");
if (IS_ERR(adc->dma_chan)) {
ret = PTR_ERR(adc->dma_chan);
if (ret != -ENODEV) {
if (ret != -EPROBE_DEFER)
dev_err(&indio_dev->dev,
"DMA channel request failed with %d\n",
ret);
return ret;
}
/* DMA is optional: fall back to IRQ mode */
adc->dma_chan = NULL;
return 0;
}
adc->rx_buf = dma_alloc_coherent(adc->dma_chan->device->dev,
STM32_DMA_BUFFER_SIZE,