diff options
| author | Peter Ujfalusi <peter.ujfalusi@ti.com> | 2019-12-17 13:22:54 +0100 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2019-12-19 08:19:43 +0100 |
| commit | 738987a1d6f167e155c41658211f8c98c114c371 (patch) | |
| tree | 9fdb75bd953b602aa035d8edb88cb25efe9ed215 /drivers/mmc/host | |
| parent | mmc: usdhi6rol0: Use dma_request_chan() instead dma_request_slave_channel() (diff) | |
| download | linux-738987a1d6f167e155c41658211f8c98c114c371.tar.xz linux-738987a1d6f167e155c41658211f8c98c114c371.zip | |
mmc: bcm2835: 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@ti.com>
Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Link: https://lore.kernel.org/r/20191217122254.7103-1-peter.ujfalusi@ti.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/host')
| -rw-r--r-- | drivers/mmc/host/bcm2835.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/mmc/host/bcm2835.c b/drivers/mmc/host/bcm2835.c index 99f61fd2a658..c3d949847cbd 100644 --- a/drivers/mmc/host/bcm2835.c +++ b/drivers/mmc/host/bcm2835.c @@ -1393,7 +1393,17 @@ 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)) { + ret = PTR_ERR(host->dma_chan_rxtx); + host->dma_chan_rxtx = NULL; + + if (ret == -EPROBE_DEFER) + goto err; + + /* Ignore errors to fall back to PIO mode */ + } + clk = devm_clk_get(dev, NULL); if (IS_ERR(clk)) { |