linux-kernel - [PATCH v2] media: rcar_drif: Use dma_request_chan() instead dma_request_slave

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Date:   Mon, 20 Jan 2020 14:36:31 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     <mchehab@...nel.org>, <rashanmu@...il.com>, <geert@...ux-m68k.org>
CC:     <vkoul@...nel.org>, <linux-media@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-renesas-soc@...r.kernel.org>
Subject: [PATCH v2] media: rcar_drif: Use dma_request_chan() instead dma_request_slave_channel()

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@...com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
Hi,

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 | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/media/platform/rcar_drif.c b/drivers/media/platform/rcar_drif.c
index 0f267a237b42..33251f4bf181 100644
--- a/drivers/media/platform/rcar_drif.c
+++ b/drivers/media/platform/rcar_drif.c
@@ -275,10 +275,13 @@ 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 (%d)\n",
+					  i, ret);
 			goto dmach_error;
 		}
 
-- 
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki