From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jim Lin Date: Thu, 21 Jun 2012 18:42:19 +0800 Subject: [U-Boot] [PATCH v4 1/1] tegra: usb: Fix device enumeration problem of USB1 In-Reply-To: <201206211216.15818.marek.vasut@gmail.com> References: <4B9C9637D5087840A465BDCB251780E9E2D6EDA3E6@HKMAIL02.nvidia.com> <201206211216.15818.marek.vasut@gmail.com> Message-ID: <4B9C9637D5087840A465BDCB251780E9E2D6EDA3E7@HKMAIL02.nvidia.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de >From: Marek Vasut [mailto:marek.vasut at gmail.com] >Sent: Thursday, June 21, 2012 6:16 PM >> --- a/drivers/usb/host/ehci-tegra.c >> +++ b/drivers/usb/host/ehci-tegra.c >> @@ -1,5 +1,5 @@ >> /* >> - * Copyright (c) 2009 NVIDIA Corporation >> + * Copyright (c) 2009-2012 NVIDIA Corporation >> * >> * See file CREDITS for list of people who contributed to this >> * project. >> @@ -29,6 +29,22 @@ >> #include >> #include >> >> +/* >> + * A known hardware issue where Connect Status Change bit of PORTSC >> register + * of USB1 controller will be set after Port Reset. >> + * We have to clear it in order for later device enumeration to proceed. >> + * This ehci_powerup_fixup overrides the weak function ehci_powerup_fixup >> + * in "ehci-hcd.c". >> + */ >> +void ehci_powerup_fixup(uint32_t *status_reg, uint32_t *reg) > >So it was even enough to use the already preinstalled callback? :-) Yes. >> +{ >> + mdelay(50); >> + if (((u32) status_reg & 0xFFFFC000) != TEGRA_USB1_BASE) > >What's this magic number here? Address Mask value, any suggestion? >> + return; > + /* For EHCI_PS_CSC to be cleared in ehci_hcd.c */ >> + if (ehci_readl(status_reg) & EHCI_PS_CSC) >> + *reg |= EHCI_PS_CSC; > >writel() The real IO write (ehci_writel) is done in ehci-hcd.c after calling of ehci_powerup_fixup. Any suggestion? ----------------------------------------------------------------------------------- This email message is for the sole use of the intended recipient(s) and may contain confidential information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply email and destroy all copies of the original message. -----------------------------------------------------------------------------------