mmc: mmci: Use dma_request_chan() instead dma_request_slave_channel() (716d0205) · Commits · 戴 / test

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>

drivers/mmc/host/mmci.c

+14 −4

Original line number	Diff line number	Diff line
		@@ -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

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