diff options
| author | Robby Cai <R63905@freescale.com> | 2010-12-07 16:36:32 +0800 |
|---|---|---|
| committer | Robby Cai <R63905@freescale.com> | 2010-12-09 16:06:44 +0800 |
| commit | 6434c67be8cc60f746d67ceebd3f06fa23950711 (patch) | |
| tree | 195bc5c9cfa600cc0821f126071d5d858d532009 | |
| parent | bc64249a0bcbec706330bc48c504bc0e7cee242c (diff) | |
ENGR00136101-1 MX50: Export timeout value to turn off ePxP clock when inactive
Usage (timeout in millisecond, default is 600):
echo 2000 > /sys/devices/platform/mxc-pxp/clk_off_timeout
Signed-off-by: Robby Cai <R63905@freescale.com>
| -rw-r--r-- | drivers/dma/pxp/pxp_dma.c | 34 |
1 files changed, 32 insertions, 2 deletions
diff --git a/drivers/dma/pxp/pxp_dma.c b/drivers/dma/pxp/pxp_dma.c index 98fdc615b348..d87b1d278d24 100644 --- a/drivers/dma/pxp/pxp_dma.c +++ b/drivers/dma/pxp/pxp_dma.c @@ -41,6 +41,7 @@ #define PXP_DOWNSCALE_THRESHOLD 0x4000 static LIST_HEAD(head); +static int timeout_in_ms = 600; struct pxp_dma { struct dma_device dma; @@ -680,7 +681,8 @@ static void pxp_clkoff_timer(unsigned long arg) if ((pxp->pxp_ongoing == 0) && list_empty(&head)) schedule_work(&pxp->work); else - mod_timer(&pxp->clk_timer, jiffies + msecs_to_jiffies(4000)); + mod_timer(&pxp->clk_timer, + jiffies + msecs_to_jiffies(timeout_in_ms)); } static struct pxp_tx_desc *pxpdma_first_active(struct pxp_channel *pxp_chan) @@ -765,7 +767,7 @@ static void pxpdma_dostart_work(struct pxps *pxp) pxp_start(pxp); - mod_timer(&pxp->clk_timer, jiffies + msecs_to_jiffies(4000)); + mod_timer(&pxp->clk_timer, jiffies + msecs_to_jiffies(timeout_in_ms)); spin_unlock_irqrestore(&pxp->lock, flags); } @@ -1343,6 +1345,27 @@ static int pxp_dma_init(struct pxps *pxp) return dma_async_device_register(&pxp_dma->dma); } +static ssize_t clk_off_timeout_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%d\n", timeout_in_ms); +} + +static ssize_t clk_off_timeout_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + int val; + if (sscanf(buf, "%d", &val) > 0) { + timeout_in_ms = val; + return count; + } + return -EINVAL; +} + +static DEVICE_ATTR(clk_off_timeout, 0644, clk_off_timeout_show, + clk_off_timeout_store); + static int pxp_probe(struct platform_device *pdev) { struct pxps *pxp; @@ -1401,6 +1424,12 @@ static int pxp_probe(struct platform_device *pdev) if (err < 0) goto err_dma_init; + if (device_create_file(&pdev->dev, &dev_attr_clk_off_timeout)) { + dev_err(&pdev->dev, + "Unable to create file from clk_off_timeout\n"); + goto err_dma_init; + } + INIT_WORK(&pxp->work, clkoff_callback); init_waitqueue_head(&pxp->done); init_timer(&pxp->clk_timer); @@ -1428,6 +1457,7 @@ static int __devexit pxp_remove(struct platform_device *pdev) clk_disable(pxp->clk); clk_put(pxp->clk); iounmap(pxp->base); + device_remove_file(&pdev->dev, &dev_attr_clk_off_timeout); kfree(pxp); |