forked from luck/tmp_suning_uos_patched
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>
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3bb8029a24
commit
a464dc4d40
@ -21,10 +21,13 @@
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/usb/otg.h>
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#include <linux/usb/ulpi.h>
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#include <linux/slab.h>
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#include <mach/mxc_ehci.h>
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#include <asm/mach-types.h>
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#define ULPI_VIEWPORT_OFFSET 0x170
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struct ehci_mxc_priv {
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@ -114,6 +117,7 @@ static int ehci_mxc_drv_probe(struct platform_device *pdev)
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struct usb_hcd *hcd;
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struct resource *res;
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int irq, ret;
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unsigned int flags;
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struct ehci_mxc_priv *priv;
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struct device *dev = &pdev->dev;
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struct ehci_hcd *ehci;
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@ -240,6 +244,23 @@ static int ehci_mxc_drv_probe(struct platform_device *pdev)
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if (ret)
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goto err_add;
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if (pdata->otg) {
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/*
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* efikamx and efikasb have some hardware bug which is
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* preventing usb to work unless CHRGVBUS is set.
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* It's in violation of USB specs
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*/
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if (machine_is_mx51_efikamx() || machine_is_mx51_efikasb()) {
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flags = otg_io_read(pdata->otg, ULPI_OTG_CTRL);
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flags |= ULPI_OTG_CTRL_CHRGVBUS;
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ret = otg_io_write(pdata->otg, flags, ULPI_OTG_CTRL);
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if (ret) {
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dev_err(dev, "unable to set CHRVBUS\n");
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goto err_add;
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}
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}
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}
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return 0;
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err_add:
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