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author | Arnd Bergmann <arnd@arndb.de> | 2015-02-03 16:55:54 +0100 |
---|---|---|
committer | Ulf Hansson <ulf.hansson@linaro.org> | 2015-02-04 09:42:29 +0100 |
commit | 3981c516664d81a3e83c1923fa1ab3988c529402 (patch) | |
tree | c7c43a53c07d85fe91eabe9dc508b191e256df8b /drivers/mmc/host/moxart-mmc.c | |
parent | mmc: core: Invoke mmc_pwrseq_post_power_on() prior MMC_POWER_ON state (diff) | |
download | linux-3981c516664d81a3e83c1923fa1ab3988c529402.tar.xz linux-3981c516664d81a3e83c1923fa1ab3988c529402.zip |
mmc: moxart: fix probe logic
Jonas Jensen wanted to submit a patch for these, but apparently
forgot about it. I stumbled over this symptom first:
drivers/built-in.o: In function `moxart_probe':
:(.text+0x2af128): undefined reference to `of_dma_request_slave_channel'
This is because of_dma_request_slave_channel is an internal helper
and not exported to loadable module. I'm changing the driver to
use dma_request_slave_channel_reason() instead.
Further problems from inspection:
* The remove function must not call kfree on the host pointer,
because it is allocated together with the mmc_host.
* The clock is never released
* The dma_cap_mask_t is completely unused and can be removed
* deferred probing does not work if the dma driver is loaded
after the mmc driver.
This patch should fix all of the above.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jonas Jensen <jonas.jensen@gmail.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/host/moxart-mmc.c')
-rw-r--r-- | drivers/mmc/host/moxart-mmc.c | 20 |
1 files changed, 9 insertions, 11 deletions
diff --git a/drivers/mmc/host/moxart-mmc.c b/drivers/mmc/host/moxart-mmc.c index d2a1ef61ec97..006f1862444b 100644 --- a/drivers/mmc/host/moxart-mmc.c +++ b/drivers/mmc/host/moxart-mmc.c @@ -17,6 +17,7 @@ #include <linux/init.h> #include <linux/platform_device.h> #include <linux/delay.h> +#include <linux/errno.h> #include <linux/interrupt.h> #include <linux/blkdev.h> #include <linux/dma-mapping.h> @@ -562,7 +563,6 @@ static int moxart_probe(struct platform_device *pdev) struct dma_slave_config cfg; struct clk *clk; void __iomem *reg_mmc; - dma_cap_mask_t mask; int irq, ret; u32 i; @@ -586,9 +586,8 @@ static int moxart_probe(struct platform_device *pdev) goto out; } - clk = of_clk_get(node, 0); + clk = devm_clk_get(dev, NULL); if (IS_ERR(clk)) { - dev_err(dev, "of_clk_get failed\n"); ret = PTR_ERR(clk); goto out; } @@ -603,9 +602,6 @@ static int moxart_probe(struct platform_device *pdev) if (ret) goto out; - dma_cap_zero(mask); - dma_cap_set(DMA_SLAVE, mask); - host = mmc_priv(mmc); host->mmc = mmc; host->base = reg_mmc; @@ -613,8 +609,8 @@ static int moxart_probe(struct platform_device *pdev) host->timeout = msecs_to_jiffies(1000); host->sysclk = clk_get_rate(clk); host->fifo_width = readl(host->base + REG_FEATURE) << 2; - host->dma_chan_tx = of_dma_request_slave_channel(node, "tx"); - host->dma_chan_rx = of_dma_request_slave_channel(node, "rx"); + host->dma_chan_tx = dma_request_slave_channel_reason(dev, "tx"); + host->dma_chan_rx = dma_request_slave_channel_reason(dev, "rx"); spin_lock_init(&host->lock); @@ -624,6 +620,11 @@ static int moxart_probe(struct platform_device *pdev) mmc->ocr_avail = 0xffff00; /* Support 2.0v - 3.6v power. */ if (IS_ERR(host->dma_chan_tx) || IS_ERR(host->dma_chan_rx)) { + if (PTR_ERR(host->dma_chan_tx) == -EPROBE_DEFER || + PTR_ERR(host->dma_chan_rx) == -EPROBE_DEFER) { + ret = -EPROBE_DEFER; + goto out; + } dev_dbg(dev, "PIO mode transfer enabled\n"); host->have_dma = false; } else { @@ -702,9 +703,6 @@ static int moxart_remove(struct platform_device *pdev) writel(readl(host->base + REG_CLOCK_CONTROL) | CLK_OFF, host->base + REG_CLOCK_CONTROL); } - - kfree(host); - return 0; } |