Paul
I was debugging why EHCI is not coming up and getting stuck in infinite loop for TLL not enabling.
I found that there is issue with clock framework in enabling "usbtll_fck" clock.
On enabling tll-fck clock, the framework returns error for the node:
static struct clk dpll5_ck = {
.name = "dpll5_ck",
.parent = &sys_ck,
.prcm_mod = PLL_MOD,
.dpll_data = &dpll5_dd,
.flags = CLOCK_IN_OMAP3430ES2 | RATE_PROPAGATES,
.enable = &omap3_noncore_dpll_enable,
.disable = &omap3_noncore_dpll_disable,
.round_rate = &omap2_dpll_round_rate,
.set_rate = &omap3_noncore_dpll_set_rate,
.clkdm = { .name = "dpll5_clkdm" },
.recalc = &omap3_dpll_recalc,
};
If I set the FCLK for USB-TLL directly as per following patch, EHCI works fine.
Please check what is wrong with the above clock node.
---
diff --git a/drivers/usb/host/ehci-omap.c b/drivers/usb/host/ehci-omap.c
index 419e70a..96b9df5 100644
--- a/drivers/usb/host/ehci-omap.c
+++ b/drivers/usb/host/ehci-omap.c
@@ -236,10 +236,9 @@ static int omap_start_ehc(struct platform_device *dev, struct usb_hcd *hcd)
#endif
/* Configure TLL for 60Mhz clk for ULPI */
- ehci_clocks->usbtll_fck_clk = clk_get(&dev->dev, USBHOST_TLL_FCLK);
- if (IS_ERR(ehci_clocks->usbtll_fck_clk))
- return PTR_ERR(ehci_clocks->usbtll_fck_clk);
- clk_enable(ehci_clocks->usbtll_fck_clk);
+
+ /* Force enable FCLK for USB-TLL */
+ omap_writel(1<<2, 0x48004A08); /* CM_FCLKEN3_CORE */
ehci_clocks->usbtll_ick_clk = clk_get(&dev->dev, USBHOST_TLL_ICKL);
if (IS_ERR(ehci_clocks->usbtll_ick_clk))
--
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