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mmc: mmci: Use dma_request_chan() instead dma_request_slave_channel()

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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>
Link: https://lore.kernel.org/r/20191217112737.31024-1-peter.ujfalusi@ti.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Peter Ujfalusi 2019-12-17 13:27:37 +02:00 committed by Ulf Hansson
parent c1fce22522
commit 716d0205fe
1 changed files with 14 additions and 4 deletions
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18
drivers/mmc/host/mmci.c
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@ -715,10 +715,20 @@ int mmci_dmae_setup(struct mmci_host *host)
host->dma_priv = dmae;
dmae->rx_channel = dma_request_slave_channel(mmc_dev(host->mmc),
"rx");
dmae->tx_channel = dma_request_slave_channel(mmc_dev(host->mmc),
"tx");
dmae->rx_channel = dma_request_chan(mmc_dev(host->mmc), "rx");
if (IS_ERR(dmae->rx_channel)) {
int ret = PTR_ERR(dmae->rx_channel);
dmae->rx_channel = NULL;
return ret;
}
dmae->tx_channel = dma_request_chan(mmc_dev(host->mmc), "tx");
if (IS_ERR(dmae->tx_channel)) {
if (PTR_ERR(dmae->tx_channel) == -EPROBE_DEFER)
dev_warn(mmc_dev(host->mmc),
"Deferred probe for TX channel ignored\n");
dmae->tx_channel = NULL;
}
/*
* If only an RX channel is specified, the driver will