Hi,
On 20/01/2020 14.47, 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.
yes, this is suppose to be v3, but missed to change the subject-prefix.
> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@xxxxxx>
> Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
> ---
> Hi,
>
> Changes since v2:
> - Use %pe to print error name using the ch->dmach pointer
> - Set ch->dmach to NULL in case of error
>
> Changes since v1:
> - Do not print error in case of EPROBE_DEFER
> - Added Reviewed-by from Geert
>
> Regards,
> Peter
>
> drivers/media/platform/rcar_drif.c | 12 ++++++++----
> 1 file changed, 8 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/media/platform/rcar_drif.c b/drivers/media/platform/rcar_drif.c
> index 0f267a237b42..3d2451ac347d 100644
> --- a/drivers/media/platform/rcar_drif.c
> +++ b/drivers/media/platform/rcar_drif.c
> @@ -275,10 +275,14 @@ static int rcar_drif_alloc_dmachannels(struct rcar_drif_sdr *sdr)
> for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
> struct rcar_drif *ch = sdr->ch[i];
>
> - ch->dmach = dma_request_slave_channel(&ch->pdev->dev, "rx");
> - if (!ch->dmach) {
> - rdrif_err(sdr, "ch%u: dma channel req failed\n", i);
> - ret = -ENODEV;
> + ch->dmach = dma_request_chan(&ch->pdev->dev, "rx");
> + if (IS_ERR(ch->dmach)) {
> + ret = PTR_ERR(ch->dmach);
> + if (ret != -EPROBE_DEFER)
> + rdrif_err(sdr,
> + "ch%u: dma channel req failed: %pe\n",
> + i, ch->dmach);
> + ch->dmach = NULL;
> goto dmach_error;
> }
>
>
- Péter
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