| Message ID | 20191217075043.23539-1-peter.ujfalusi@ti.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | iio: adc: at91: Use dma_request_chan() instead dma_request_slave_channel() | expand |
On 17.12.2019 09:50, Peter Ujfalusi wrote: > 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> > --- > drivers/iio/adc/at91-sama5d2_adc.c | 6 +++--- > 1 file changed, 3 insertions(+), 3 deletions(-) Hi Peter, Thank you for the patch. Nitpick : at91 is another driver (old one for different platforms), so can you please change the commit oneline to iio: adc: at91-sama5d2_adc: to not be confused about which driver is affected. Thanks ! Eugen > > diff --git a/drivers/iio/adc/at91-sama5d2_adc.c b/drivers/iio/adc/at91-sama5d2_adc.c > index e1850f3d5cf3..a5c7771227d5 100644 > --- a/drivers/iio/adc/at91-sama5d2_adc.c > +++ b/drivers/iio/adc/at91-sama5d2_adc.c > @@ -1444,10 +1444,10 @@ static void at91_adc_dma_init(struct platform_device *pdev) > if (st->dma_st.dma_chan) > return; > > - st->dma_st.dma_chan = dma_request_slave_channel(&pdev->dev, "rx"); > - > - if (!st->dma_st.dma_chan) { > + st->dma_st.dma_chan = dma_request_chan(&pdev->dev, "rx"); > + if (IS_ERR(st->dma_st.dma_chan)) { > dev_info(&pdev->dev, "can't get DMA channel\n"); > + st->dma_st.dma_chan = NULL; > goto dma_exit; > } > > -- > Peter > > Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. > Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki > >
Hi Eugen, On 17/12/2019 9.59, Eugen.Hristev@microchip.com wrote: > > > On 17.12.2019 09:50, Peter Ujfalusi wrote: > >> 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> >> --- >> drivers/iio/adc/at91-sama5d2_adc.c | 6 +++--- >> 1 file changed, 3 insertions(+), 3 deletions(-) > > Hi Peter, > > Thank you for the patch. > Nitpick : at91 is another driver (old one for different platforms), so > can you please change the commit oneline to iio: adc: at91-sama5d2_adc: > to not be confused about which driver is affected. Sorry, just sent v2 with the correct subject prefix. By mistake I looked at the git log of at91_adc.c and picked the wrong prefix. > > Thanks ! > Eugen > >> >> diff --git a/drivers/iio/adc/at91-sama5d2_adc.c b/drivers/iio/adc/at91-sama5d2_adc.c >> index e1850f3d5cf3..a5c7771227d5 100644 >> --- a/drivers/iio/adc/at91-sama5d2_adc.c >> +++ b/drivers/iio/adc/at91-sama5d2_adc.c >> @@ -1444,10 +1444,10 @@ static void at91_adc_dma_init(struct platform_device *pdev) >> if (st->dma_st.dma_chan) >> return; >> >> - st->dma_st.dma_chan = dma_request_slave_channel(&pdev->dev, "rx"); >> - >> - if (!st->dma_st.dma_chan) { >> + st->dma_st.dma_chan = dma_request_chan(&pdev->dev, "rx"); >> + if (IS_ERR(st->dma_st.dma_chan)) { >> dev_info(&pdev->dev, "can't get DMA channel\n"); >> + st->dma_st.dma_chan = NULL; >> goto dma_exit; >> } >> >> -- >> Peter >> >> Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. >> Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki >> - Péter Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
diff --git a/drivers/iio/adc/at91-sama5d2_adc.c b/drivers/iio/adc/at91-sama5d2_adc.c index e1850f3d5cf3..a5c7771227d5 100644 --- a/drivers/iio/adc/at91-sama5d2_adc.c +++ b/drivers/iio/adc/at91-sama5d2_adc.c @@ -1444,10 +1444,10 @@ static void at91_adc_dma_init(struct platform_device *pdev) if (st->dma_st.dma_chan) return; - st->dma_st.dma_chan = dma_request_slave_channel(&pdev->dev, "rx"); - - if (!st->dma_st.dma_chan) { + st->dma_st.dma_chan = dma_request_chan(&pdev->dev, "rx"); + if (IS_ERR(st->dma_st.dma_chan)) { dev_info(&pdev->dev, "can't get DMA channel\n"); + st->dma_st.dma_chan = NULL; goto dma_exit; }
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> --- drivers/iio/adc/at91-sama5d2_adc.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)