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| author | Shengzhou Liu <Shengzhou.Liu@freescale.com> | 2012-10-22 13:18:24 +0800 |
|---|---|---|
| committer | Marek Vasut <marex@denx.de> | 2012-10-22 08:25:12 +0200 |
| commit | 047cea3655cf34ce1f911c282e82598ded998dd2 (patch) | |
| tree | 64b4368d01fb17c1e4745977cc73dba0d8fca93a /drivers | |
| parent | 8b8d779dacc149be0607dfc1b399bbdb62e57108 (diff) | |
| download | u-boot-imx-047cea3655cf34ce1f911c282e82598ded998dd2.zip u-boot-imx-047cea3655cf34ce1f911c282e82598ded998dd2.tar.gz u-boot-imx-047cea3655cf34ce1f911c282e82598ded998dd2.tar.bz2 | |
powerpc/usb: fix bug of CPU hang when missing USB PHY clock
when missing USB PHY clock, u-boot will hang during USB
initialization when issuing "usb start". We should check
USBGP[PHY_CLK_VALID] bit to avoid CPU hanging in this case.
Due to controller issue of PHY_CLK_VALID in ULPI mode, we set
USB_EN before checking PHY_CLK_VALID, otherwise PHY_CLK_VALID
doesn't work.
Signed-off-by: Shengzhou Liu <Shengzhou.Liu@freescale.com>
Acked-by: Marek Vasut <marex@denx.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/usb/host/ehci-fsl.c | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c index 7b8f033..f54b408 100644 --- a/drivers/usb/host/ehci-fsl.c +++ b/drivers/usb/host/ehci-fsl.c @@ -30,6 +30,18 @@ #include "ehci.h" +/* Check USB PHY clock valid */ +static int usb_phy_clk_valid(struct usb_ehci *ehci) +{ + if (!((in_be32(&ehci->control) & PHY_CLK_VALID) || + in_be32(&ehci->prictrl))) { + printf("USB PHY clock invalid!\n"); + return 0; + } else { + return 1; + } +} + /* * Create the appropriate control structures to manage * a new EHCI host controller. @@ -82,18 +94,16 @@ int ehci_hcd_init(int index, struct ehci_hccr **hccr, struct ehci_hcor **hcor) udelay(1000); /* delay required for PHY Clk to appear */ #endif out_le32(&(*hcor)->or_portsc[0], PORT_PTS_UTMI); + setbits_be32(&ehci->control, USB_EN); } else { -#if defined(CONFIG_SYS_FSL_USB_INTERNAL_UTMI_PHY) - clrbits_be32(&ehci->control, UTMI_PHY_EN); setbits_be32(&ehci->control, PHY_CLK_SEL_ULPI); + clrsetbits_be32(&ehci->control, UTMI_PHY_EN, USB_EN); udelay(1000); /* delay required for PHY Clk to appear */ -#endif + if (!usb_phy_clk_valid(ehci)) + return -EINVAL; out_le32(&(*hcor)->or_portsc[0], PORT_PTS_ULPI); } - /* Enable interface. */ - setbits_be32(&ehci->control, USB_EN); - out_be32(&ehci->prictrl, 0x0000000c); out_be32(&ehci->age_cnt_limit, 0x00000040); out_be32(&ehci->sictrl, 0x00000001); |