From: Peter Ujfalusi <peter.ujfalusi@ti.com>
To: <mchehab@kernel.org>, <hugues.fruchet@st.com>,
<mcoquelin.stm32@gmail.com>, <alexandre.torgue@st.com>
Cc: <vkoul@kernel.org>, <linux-media@vger.kernel.org>,
<linux-kernel@vger.kernel.org>,
<linux-stm32@st-md-mailman.stormreply.com>,
<linux-arm-kernel@lists.infradead.org>
Subject: [PATCH v2] media: stm32-dcmi: Use dma_request_chan() instead dma_request_slave_channel()
Date: Tue, 7 Jan 2020 13:52:53 +0200 [thread overview]
Message-ID: <20200107115253.8351-1-peter.ujfalusi@ti.com> (raw)
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>
---
Hi,
Changes since v1:
- Do not print error for EPROBE_DEFER
Regards,
Peter
drivers/media/platform/stm32/stm32-dcmi.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/drivers/media/platform/stm32/stm32-dcmi.c b/drivers/media/platform/stm32/stm32-dcmi.c
index 9392e3409fba..b63ff8d636ce 100644
--- a/drivers/media/platform/stm32/stm32-dcmi.c
+++ b/drivers/media/platform/stm32/stm32-dcmi.c
@@ -1910,10 +1910,13 @@ static int dcmi_probe(struct platform_device *pdev)
return PTR_ERR(mclk);
}
- chan = dma_request_slave_channel(&pdev->dev, "tx");
- if (!chan) {
- dev_info(&pdev->dev, "Unable to request DMA channel, defer probing\n");
- return -EPROBE_DEFER;
+ chan = dma_request_chan(&pdev->dev, "tx");
+ if (IS_ERR(chan)) {
+ ret = PTR_ERR(chan);
+ if (ret != -EPROBE_DEFER)
+ dev_err(&pdev->dev,
+ "Failed to request DMA channel: %d\n", ret);
+ return ret;
}
spin_lock_init(&dcmi->irqlock);
--
Peter
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
next reply other threads:[~2020-01-07 11:52 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-07 11:52 Peter Ujfalusi [this message]
2020-01-07 13:38 ` [PATCH v2] media: stm32-dcmi: Use dma_request_chan() instead dma_request_slave_channel() Hugues FRUCHET
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