On Fri, Feb 20, 2009 at 12:05:49PM -0700, Gary Thomas wrote:
> Felipe Balbi wrote:
> > On Fri, Feb 20, 2009 at 11:50:44AM -0700, Gary Thomas wrote:
> >> Felipe Balbi wrote:
> >>> On Fri, Feb 20, 2009 at 11:15:36AM -0700, Gary Thomas wrote:
> >>>> I have a 3530 board (similar to the OMAP3EVM) and I'm trying
> >>>> to get the USB host working. Sadly, this is failing, but I
> >>>> don't quite see why. From drivers/usb/host/echi-omap.c:
> >>>> /* Wait for TLL to be Active */
> >>>> timeout = 1000;
> >>>> while ((cm_read_mod_reg(CORE_MOD, OMAP2430_CM_IDLEST3)
> >>>> & (1 << OMAP3430ES2_ST_USBTLL_SHIFT)))
> >>>> {
> >>>> if (--timeout <= 0) {
> >>>> printk(KERN_ERR "USB TLL is unavailable\n");
> >>>> return -ENODEV;
> >>>> }
> >>>> cpu_relax();
> >>>> }
> >>>>
> >>>> Any clues on why this might be? How do I solve it?
> >>> could you enable CONFIG_DEBUG_LL and post the seria console output ?
> >>>
> >>> do you really use TLL ?? I don't really know omap3evm, but I guess it
> >>> uses PHY mode (correct me if I'm wrong).
> >>>
> >> It's not that I _need_ TLL, the driver function omap_start_ehci()
> >> tries to reset the part of the USB controller and fails. I'm just
> >> trying to understand why this part of the code falls over.
> >
> > you have OMAP_EHCI_TLL_MODE set, you should probably use
> > OMAP_EHCI_PHY_MODE instead.
> >
> > You can fix it via "make menuconfig"
> >
>
> I already have that; this code is still being used.
> # CONFIG_OMAP_EHCI_TLL_MODE is not set
> CONFIG_OMAP_EHCI_PHY_MODE=y
>
> This is not used in the function above at all.
hmm.. true, just checked the function.
Weird, TRM says when that bit is 1, we cannot access ST_USBTLL, we
should access it when it's 0, try the following:
diff --git a/drivers/usb/host/ehci-omap.c b/drivers/usb/host/ehci-omap.c
index 1b3266c..122e95b 100644
--- a/drivers/usb/host/ehci-omap.c
+++ b/drivers/usb/host/ehci-omap.c
@@ -250,7 +250,7 @@ static int omap_start_ehc(struct platform_device *dev, struct usb_hcd *hcd)
/* Wait for TLL to be Active */
while ((cm_read_mod_reg(CORE_MOD, OMAP2430_CM_IDLEST3)
- & (1 << OMAP3430ES2_ST_USBTLL_SHIFT)))
+ & (0 << OMAP3430ES2_ST_USBTLL_SHIFT)))
cpu_relax();
/* perform TLL soft reset, and wait until reset is complete */
and tell us if it worked
--
balbi
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