mmc: omap_hsmmc: 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>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 3563321..24ebc9a 100644 (file)
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -32,7 +32,6 @@
 #include <linux/of_irq.h>
 #include <linux/of_gpio.h>
 #include <linux/of_device.h>
-#include <linux/omap-dmaengine.h>
 #include <linux/mmc/host.h>
 #include <linux/mmc/core.h>
 #include <linux/mmc/mmc.h>
@@ -1993,8 +1992,6 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
        struct resource *res;
        int ret, irq;
        const struct of_device_id *match;
-       dma_cap_mask_t mask;
-       unsigned tx_req, rx_req;
        const struct omap_mmc_of_data *data;
        void __iomem *base;
 
@@ -2124,44 +2121,17 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
 
        omap_hsmmc_conf_bus_power(host);
 
-       if (!pdev->dev.of_node) {
-               res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx");
-               if (!res) {
-                       dev_err(mmc_dev(host->mmc), "cannot get DMA TX channel\n");
-                       ret = -ENXIO;
-                       goto err_irq;
-               }
-               tx_req = res->start;
-
-               res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx");
-               if (!res) {
-                       dev_err(mmc_dev(host->mmc), "cannot get DMA RX channel\n");
-                       ret = -ENXIO;
-                       goto err_irq;
-               }
-               rx_req = res->start;
-       }
-
-       dma_cap_zero(mask);
-       dma_cap_set(DMA_SLAVE, mask);
-
-       host->rx_chan =
-               dma_request_slave_channel_compat(mask, omap_dma_filter_fn,
-                                                &rx_req, &pdev->dev, "rx");
-
-       if (!host->rx_chan) {
-               dev_err(mmc_dev(host->mmc), "unable to obtain RX DMA engine channel\n");
-               ret = -ENXIO;
+       host->rx_chan = dma_request_chan(&pdev->dev, "rx");
+       if (IS_ERR(host->rx_chan)) {
+               dev_err(mmc_dev(host->mmc), "RX DMA channel request failed\n");
+               ret = PTR_ERR(host->rx_chan);
                goto err_irq;
        }
 
-       host->tx_chan =
-               dma_request_slave_channel_compat(mask, omap_dma_filter_fn,
-                                                &tx_req, &pdev->dev, "tx");
-
-       if (!host->tx_chan) {
-               dev_err(mmc_dev(host->mmc), "unable to obtain TX DMA engine channel\n");
-               ret = -ENXIO;
+       host->tx_chan = dma_request_chan(&pdev->dev, "tx");
+       if (IS_ERR(host->tx_chan)) {
+               dev_err(mmc_dev(host->mmc), "TX DMA channel request failed\n");
+               ret = PTR_ERR(host->tx_chan);
                goto err_irq;
        }
 
@@ -2219,9 +2189,9 @@ err_slot_name:
        mmc_remove_host(mmc);
 err_irq:
        device_init_wakeup(&pdev->dev, false);
-       if (host->tx_chan)
+       if (!IS_ERR_OR_NULL(host->tx_chan))
                dma_release_channel(host->tx_chan);
-       if (host->rx_chan)
+       if (!IS_ERR_OR_NULL(host->rx_chan))
                dma_release_channel(host->rx_chan);
        pm_runtime_dont_use_autosuspend(host->dev);
        pm_runtime_put_sync(host->dev);