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| author | Arnaud Patard (Rtp) <arnaud.patard@rtp-net.org> | 2011-01-18 00:04:12 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-01-22 18:48:10 -0800 |
| commit | a464dc4d4044c936d4558725fa2229fb4a1aa932 (patch) | |
| tree | a551fcf656c2a3bb489efc0f7e71f6bf6958c053 /drivers/usb/host/ehci-mxc.c | |
| parent | 3bb8029a2445e289efade6133b01545143336f70 (diff) | |
| download | linux-a464dc4d4044c936d4558725fa2229fb4a1aa932.tar.gz linux-a464dc4d4044c936d4558725fa2229fb4a1aa932.tar.bz2 linux-a464dc4d4044c936d4558725fa2229fb4a1aa932.zip | |
USB: ehci-mxc: add work-around for efika mx/sb bug
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
Signed-off-by: Arnaud Patard <arnaud.patard@rtp-net.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/host/ehci-mxc.c')
| -rw-r--r-- | drivers/usb/host/ehci-mxc.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-mxc.c b/drivers/usb/host/ehci-mxc.c index d443fbd8535b..c8e360d7d975 100644 --- a/drivers/usb/host/ehci-mxc.c +++ b/drivers/usb/host/ehci-mxc.c @@ -21,10 +21,13 @@ #include <linux/clk.h> #include <linux/delay.h> #include <linux/usb/otg.h> +#include <linux/usb/ulpi.h> #include <linux/slab.h> #include <mach/mxc_ehci.h> +#include <asm/mach-types.h> + #define ULPI_VIEWPORT_OFFSET 0x170 struct ehci_mxc_priv { @@ -114,6 +117,7 @@ static int ehci_mxc_drv_probe(struct platform_device *pdev) struct usb_hcd *hcd; struct resource *res; int irq, ret; + unsigned int flags; struct ehci_mxc_priv *priv; struct device *dev = &pdev->dev; struct ehci_hcd *ehci; @@ -240,6 +244,23 @@ static int ehci_mxc_drv_probe(struct platform_device *pdev) if (ret) goto err_add; + if (pdata->otg) { + /* + * efikamx and efikasb have some hardware bug which is + * preventing usb to work unless CHRGVBUS is set. + * It's in violation of USB specs + */ + if (machine_is_mx51_efikamx() || machine_is_mx51_efikasb()) { + flags = otg_io_read(pdata->otg, ULPI_OTG_CTRL); + flags |= ULPI_OTG_CTRL_CHRGVBUS; + ret = otg_io_write(pdata->otg, flags, ULPI_OTG_CTRL); + if (ret) { + dev_err(dev, "unable to set CHRVBUS\n"); + goto err_add; + } + } + } + return 0; err_add: |