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mmc: omap: Use dma_request_chan() for requesting DMA channel 

With the new dma_request_chan() the client driver does not need to look for
the DMA resource and it does not need to pass filter_fn anymore.
By switching to the new API the driver can now support deferred probing
against DMA.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
CC: Ulf Hansson <ulf.hansson@linaro.org>
CC: Jarkko Nikula <jarkko.nikula@bitmer.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Peter Ujfalusi 2016-05-04 11:23:08 +03:00 committed by Ulf Hansson
parent 437db4c6e7
commit d15b08fb22
1 changed files with 24 additions and 22 deletions
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46
drivers/mmc/host/omap.c
View File

@ -23,7 +23,6 @@
#include <linux/spinlock.h>
#include <linux/timer.h>
#include <linux/of.h>
#include <linux/omap-dma.h>
#include <linux/mmc/host.h>
#include <linux/mmc/card.h>
#include <linux/mmc/mmc.h>
@ -1321,8 +1320,6 @@ static int mmc_omap_probe(struct platform_device *pdev)
struct omap_mmc_platform_data *pdata = pdev->dev.platform_data;
struct mmc_omap_host *host = NULL;
struct resource *res;
dma_cap_mask_t mask;
unsigned sig = 0;
int i, ret = 0;
int irq;
@ -1382,29 +1379,34 @@ static int mmc_omap_probe(struct platform_device *pdev)
goto err_free_iclk;
}
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);
host->dma_tx_burst = -1;
host->dma_rx_burst = -1;
res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx");
if (res)
sig = res->start;
host->dma_tx = dma_request_slave_channel_compat(mask,
omap_dma_filter_fn, &sig, &pdev->dev, "tx");
if (!host->dma_tx)
dev_warn(host->dev, "unable to obtain TX DMA engine channel %u\n",
sig);
host->dma_tx = dma_request_chan(&pdev->dev, "tx");
if (IS_ERR(host->dma_tx)) {
ret = PTR_ERR(host->dma_tx);
if (ret == -EPROBE_DEFER) {
clk_put(host->fclk);
goto err_free_iclk;
}
res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx");
if (res)
sig = res->start;
host->dma_rx = dma_request_slave_channel_compat(mask,
omap_dma_filter_fn, &sig, &pdev->dev, "rx");
if (!host->dma_rx)
dev_warn(host->dev, "unable to obtain RX DMA engine channel %u\n",
sig);
host->dma_tx = NULL;
dev_warn(host->dev, "TX DMA channel request failed\n");
}
host->dma_rx = dma_request_chan(&pdev->dev, "rx");
if (IS_ERR(host->dma_rx)) {
ret = PTR_ERR(host->dma_rx);
if (ret == -EPROBE_DEFER) {
if (host->dma_tx)
dma_release_channel(host->dma_tx);
clk_put(host->fclk);
goto err_free_iclk;
}
host->dma_rx = NULL;
dev_warn(host->dev, "RX DMA channel request failed\n");
}
ret = request_irq(host->irq, mmc_omap_irq, 0, DRIVER_NAME, host);
if (ret)