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Subject[PATCH] mmc: bcm2835: Use dma_request_chan() instead dma_request_slave_channel()
Date
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/mmc/host/bcm2835.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/bcm2835.c b/drivers/mmc/host/bcm2835.c
index 99f61fd2a658..3821f159d36d 100644
--- a/drivers/mmc/host/bcm2835.c
+++ b/drivers/mmc/host/bcm2835.c
@@ -1393,7 +1393,15 @@ static int bcm2835_probe(struct platform_device *pdev)
host->dma_chan = NULL;
host->dma_desc = NULL;

- host->dma_chan_rxtx = dma_request_slave_channel(dev, "rx-tx");
+ host->dma_chan_rxtx = dma_request_chan(dev, "rx-tx");
+ if (IS_ERR(host->dma_chan_rxtx)) {
+ if (PTR_ERR(host->dma_chan_rxtx) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+
+ /* Ignore errors to fall back to PIO mode */
+ host->dma_chan_rxtx = NULL;
+ }
+

clk = devm_clk_get(dev, NULL);
if (IS_ERR(clk)) {
--
Peter
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

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