From 3799c40189570133f9bb3176be24f0edb0e823c6 Mon Sep 17 00:00:00 2001 From: Ben Dooks Date: Sun, 2 Apr 2006 01:45:00 +0100 Subject: [PATCH] USB: S3C2410: use clk_enable() to ensure 48MHz to OHCI core Get the "usb-bus" clock and ensure it is enabled when the OHCI core is in use. It seems that a few bootloaders do not enable the UPLL at startup, which stops the OHCI core having a 48MHz bus clock. The improvements to the clock framework for the s3c24xx now allow the USB PLL to be started and stopped when being used. Signed-off-by: Ben Dooks Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/ohci-s3c2410.c | 32 ++++++++++++++++++++++++-------- 1 file changed, 24 insertions(+), 8 deletions(-) diff --git a/drivers/usb/host/ohci-s3c2410.c b/drivers/usb/host/ohci-s3c2410.c index b27669fe9f0f..1da5de573a6f 100644 --- a/drivers/usb/host/ohci-s3c2410.c +++ b/drivers/usb/host/ohci-s3c2410.c @@ -30,6 +30,7 @@ /* clock device associated with the hcd */ static struct clk *clk; +static struct clk *usb_clk; /* forward definitions */ @@ -47,6 +48,10 @@ static void s3c2410_start_hc(struct platform_device *dev, struct usb_hcd *hcd) struct s3c2410_hcd_info *info = dev->dev.platform_data; dev_dbg(&dev->dev, "s3c2410_start_hc:\n"); + + clk_enable(usb_clk); + mdelay(2); /* let the bus clock stabilise */ + clk_enable(clk); if (info != NULL) { @@ -75,6 +80,7 @@ static void s3c2410_stop_hc(struct platform_device *dev) } clk_disable(clk); + clk_disable(usb_clk); } /* ohci_s3c2410_hub_status_data @@ -354,14 +360,21 @@ static int usb_hcd_s3c2410_probe (const struct hc_driver *driver, if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { dev_err(&dev->dev, "request_mem_region failed"); retval = -EBUSY; - goto err0; + goto err_put; } - clk = clk_get(NULL, "usb-host"); + clk = clk_get(&dev->dev, "usb-host"); if (IS_ERR(clk)) { dev_err(&dev->dev, "cannot get usb-host clock\n"); retval = -ENOENT; - goto err1; + goto err_mem; + } + + usb_clk = clk_get(&dev->dev, "upll"); + if (IS_ERR(usb_clk)) { + dev_err(&dev->dev, "cannot get usb-host clock\n"); + retval = -ENOENT; + goto err_clk; } s3c2410_start_hc(dev, hcd); @@ -370,26 +383,29 @@ static int usb_hcd_s3c2410_probe (const struct hc_driver *driver, if (!hcd->regs) { dev_err(&dev->dev, "ioremap failed\n"); retval = -ENOMEM; - goto err2; + goto err_ioremap; } ohci_hcd_init(hcd_to_ohci(hcd)); retval = usb_add_hcd(hcd, dev->resource[1].start, SA_INTERRUPT); if (retval != 0) - goto err2; + goto err_ioremap; return 0; - err2: + err_ioremap: s3c2410_stop_hc(dev); iounmap(hcd->regs); + clk_put(usb_clk); + + err_clk: clk_put(clk); - err1: + err_mem: release_mem_region(hcd->rsrc_start, hcd->rsrc_len); - err0: + err_put: usb_put_hcd(hcd); return retval; } -- cgit v1.2.2