tegra: usb: Fix device enumeration problem of USB1

A known hardware issue of USB1 port where bit 1 (connect status change) of PORTSC register will be set after issuing Port Reset (like "usb reset" in u-boot command line).
This will be treated as an error and stops later device enumeration.

Therefore we clear that bit after Port Reset in order to proceed later device enumeration.

---
To reproduce this issue, you can modify board .dts file to set as the following to build u-boot binary.
"
usb0 = "/usb at c5000000";
usb1 = "/usb at c5008000";
"
Install device on USB1 port (address at 0xc5000000). And run "usb reset" in u-boot console to enumerate device.

Before adding this patch, we could see problem every time. After adding, tried 10 times of "usb reset", "usb tree", "usb stop" , without seeing issue.

Changes in v3:
- Move patch for USB1 controller into ehci_powerup_fixup of ehci-tegra.c
- Update copyright year to 2012

Changes in v2:
- Change config name
- Add a callback function at the end of ehci_submit_root() function

 drivers/usb/host/ehci-tegra.c |   19 ++++++++++++++++++-
 1 files changed, 18 insertions(+), 1 deletions(-)

index a7e105b..8e516e5 100644
@@ -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 +29,23 @@
 #include <asm/errno.h>
 #include <asm/arch/usb.h>
 
+/*
+ * 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.
+ */
+void ehci_powerup_fixup(uint32_t *status_reg, uint32_t *reg)
+{
+	uint32_t my_reg;
+
+	mdelay(50);
+	if (((u32) status_reg & 0xFFFFC000) != TEGRA_USB1_BASE)
+		return;
+	my_reg = ehci_readl(status_reg);
+	/* For EHCI_PS_CSC to be cleared in ehci_hcd.c */
+	if (my_reg & EHCI_PS_CSC)
+		*reg |= EHCI_PS_CSC;
+}
 
 /*
  * Create the appropriate control structures to manage

1.7.3

nvpublic

But a couple of nits below,