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USB ehci: Add powerup fixup for EfikaSB 

The EfikaSB has a bug requiring to write to an ULPI register after
powerup. It doesn't seem that this this bug is present on any other
hardware, so add a workaround directly into the driver.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2012-11-30 00:24:19 +01:00
parent da8b72508b
commit 9239281a5e
1 changed files with 24 additions and 0 deletions
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24
drivers/usb/host/ehci-hcd.c
View File

@ -34,6 +34,7 @@
struct ehci_priv {
int rootdev;
struct device_d *dev;
struct ehci_hccr *hccr;
struct ehci_hcor *hcor;
struct usb_host host;
@ -425,6 +426,27 @@ static inline int min3(int a, int b, int c)
return a;
}
#ifdef CONFIG_MACH_EFIKA_MX_SMARTBOOK
#include <usb/ulpi.h>
/*
* Add support for setting CHRGVBUS to workaround a hardware bug on efika mx/sb
* boards.
* See http://lists.infradead.org/pipermail/linux-arm-kernel/2011-January/037341.html
*/
void ehci_powerup_fixup(struct ehci_priv *ehci)
{
void *viewport = (void *)ehci->hcor + 0x30;
if (ehci->dev->id > 0)
ulpi_write(ULPI_OTG_CHRG_VBUS, ULPI_OTGCTL + ULPI_REG_SET,
viewport);
}
#else
static inline void ehci_powerup_fixup(struct ehci_priv *ehci)
{
}
#endif
static int
ehci_submit_root(struct usb_device *dev, unsigned long pipe, void *buffer,
int length, struct devrequest *req)
@ -610,6 +632,7 @@ ehci_submit_root(struct usb_device *dev, unsigned long pipe, void *buffer,
* usb 2.0 specification say 50 ms resets on
* root
*/
ehci_powerup_fixup(ehci);
wait_ms(50);
ehci->portreset |= 1 << le16_to_cpu(req->index);
/* terminate the reset */
@ -819,6 +842,7 @@ int ehci_register(struct device_d *dev, struct ehci_data *data)
ehci->flags = data->flags;
ehci->hccr = data->hccr;
ehci->hcor = data->hcor;
ehci->dev = dev;
ehci->qh_list = dma_alloc_coherent(sizeof(struct QH) * NUM_TD);
ehci->td = dma_alloc_coherent(sizeof(struct qTD) * NUM_TD);