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authorKuninori Morimoto <morimoto.kuninori@renesas.com>2009-04-10 00:54:07 +0000
committerPaul Mundt <lethal@linux-sh.org>2009-04-14 07:25:35 +0900
commit0ee50254dfe0c96f9eef4fc9fdf47a18d6a12df3 (patch)
treee5dd3e586d13e3aa4b454152ad4606eff81c57b7 /arch/sh
parent066069e14f6b4651293ae0865c121bcb2b360666 (diff)
downloadblackbird-op-linux-0ee50254dfe0c96f9eef4fc9fdf47a18d6a12df3.tar.gz
blackbird-op-linux-0ee50254dfe0c96f9eef4fc9fdf47a18d6a12df3.zip
sh: sh7786: modify usb setup timeout judgment bug.
This corrects a race with the PHY RST bit not being set properly if the PLL status changes right before timeout. This resulted in it potentially failing even if the device came up in time. Special thanks to Mr. Juha Leppanen and Iwamatsu-san for reporting this out and reviewing it. Reported-by: Juha Leppanen <juha_motorsportcom@luukku.com> Reviewed-by: Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com> Tested-by: Paul Mundt <lethal@linux-sh.org> Signed-off-by: Kuninori Morimoto <morimoto.kuninori@renesas.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh')
-rw-r--r--arch/sh/kernel/cpu/sh4a/setup-sh7786.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/arch/sh/kernel/cpu/sh4a/setup-sh7786.c b/arch/sh/kernel/cpu/sh4a/setup-sh7786.c
index 5a47e1cf442e..90e8cfff55fd 100644
--- a/arch/sh/kernel/cpu/sh4a/setup-sh7786.c
+++ b/arch/sh/kernel/cpu/sh4a/setup-sh7786.c
@@ -143,14 +143,14 @@ static void __init sh7786_usb_setup(void)
* Set the PHY and PLL enable bit
*/
__raw_writel(PHY_ENB | PLL_ENB, USBPCTL1);
- while (i-- &&
- ((__raw_readl(USBST) & ACT_PLL_STATUS) != ACT_PLL_STATUS))
+ while (i--) {
+ if (ACT_PLL_STATUS == (__raw_readl(USBST) & ACT_PLL_STATUS)) {
+ /* Set the PHY RST bit */
+ __raw_writel(PHY_ENB | PLL_ENB | PHY_RST, USBPCTL1);
+ printk(KERN_INFO "sh7786 usb setup done\n");
+ break;
+ }
cpu_relax();
-
- if (i) {
- /* Set the PHY RST bit */
- __raw_writel(PHY_ENB | PLL_ENB | PHY_RST, USBPCTL1);
- printk(KERN_INFO "sh7786 usb setup done\n");
}
}
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