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path: root/drivers/usb/host/ehci-tegra.c
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Diffstat (limited to 'drivers/usb/host/ehci-tegra.c')
-rw-r--r--drivers/usb/host/ehci-tegra.c18
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/usb/host/ehci-tegra.c b/drivers/usb/host/ehci-tegra.c
index a7e105b..4646b29 100644
--- 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 <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.
+ * 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)
+{
+ mdelay(50);
+ if (((u32) status_reg & TEGRA_USB_ADDR_MASK) != TEGRA_USB1_BASE)
+ return;
+ /* For EHCI_PS_CSC to be cleared in ehci_hcd.c */
+ if (ehci_readl(status_reg) & EHCI_PS_CSC)
+ *reg |= EHCI_PS_CSC;
+}
/*
* Create the appropriate control structures to manage