diff options
Diffstat (limited to 'drivers/mmc/host/jz4740_mmc.c')
-rw-r--r-- | drivers/mmc/host/jz4740_mmc.c | 23 |
1 files changed, 19 insertions, 4 deletions
diff --git a/drivers/mmc/host/jz4740_mmc.c b/drivers/mmc/host/jz4740_mmc.c index bb612fce7ead..7ab1b38a7be5 100644 --- a/drivers/mmc/host/jz4740_mmc.c +++ b/drivers/mmc/host/jz4740_mmc.c @@ -217,11 +217,23 @@ static void jz4740_mmc_release_dma_channels(struct jz4740_mmc_host *host) return; dma_release_channel(host->dma_tx); - dma_release_channel(host->dma_rx); + if (host->dma_rx) + dma_release_channel(host->dma_rx); } static int jz4740_mmc_acquire_dma_channels(struct jz4740_mmc_host *host) { + struct device *dev = mmc_dev(host->mmc); + + host->dma_tx = dma_request_chan(dev, "tx-rx"); + if (!IS_ERR(host->dma_tx)) + return 0; + + if (PTR_ERR(host->dma_tx) != -ENODEV) { + dev_err(dev, "Failed to get dma tx-rx channel\n"); + return PTR_ERR(host->dma_tx); + } + host->dma_tx = dma_request_chan(mmc_dev(host->mmc), "tx"); if (IS_ERR(host->dma_tx)) { dev_err(mmc_dev(host->mmc), "Failed to get dma_tx channel\n"); @@ -241,7 +253,10 @@ static int jz4740_mmc_acquire_dma_channels(struct jz4740_mmc_host *host) static inline struct dma_chan *jz4740_mmc_get_dma_chan(struct jz4740_mmc_host *host, struct mmc_data *data) { - return (data->flags & MMC_DATA_READ) ? host->dma_rx : host->dma_tx; + if ((data->flags & MMC_DATA_READ) && host->dma_rx) + return host->dma_rx; + else + return host->dma_tx; } static void jz4740_mmc_dma_unmap(struct jz4740_mmc_host *host, @@ -1113,8 +1128,8 @@ static int jz4740_mmc_resume(struct device *dev) return pinctrl_select_default_state(dev); } -DEFINE_SIMPLE_DEV_PM_OPS(jz4740_mmc_pm_ops, jz4740_mmc_suspend, - jz4740_mmc_resume); +static DEFINE_SIMPLE_DEV_PM_OPS(jz4740_mmc_pm_ops, jz4740_mmc_suspend, + jz4740_mmc_resume); static struct platform_driver jz4740_mmc_driver = { .probe = jz4740_mmc_probe, |