usb reset not working error log ==================================================================== dragonboard410c => usb reset resetting USB... Bus usb@78d9000: Port not available. dragonboard410c => ====================================================================
After commit ed8fbd2889fc ("dts: msm8916: replace with upstream DTS") msm8916_usbphy will be defined as a child device of usb@78d9000. usb reset will first call usb_stop, and msm8916_usbphy as child dev will be unbind in usb_stop, and there is no bind operation in do_usb_start afterwards, so the msm8916_usbphy uclass cannot be found. This causes ehci_msm probe to fail.
Detailed calling process ==================================================================== usb reset: |-> usb_stop (drivers/usb/host/usb-uclass.c) .|-> device_find_first_child . |-> device_unbind(rh); <== (unbind msm8916_usbphy) |-> do_usb_start |-> usb_init (drivers/usb/host/usb-uclass.c) |-> device_probe(bus); |-> ehci_usb_probe |-> generic_setup_phy <== err couldn't find msm8916_usbphy ====================================================================
Fix: rebind the msm8916_usbphy driver during ehci_usb_probe if the msm8916_usbphy uclass has been removed.
Signed-off-by: Jianfeng Zhu JianfengA.Zhu@sony.com Reviewed-by: Jacky Cao Jacky.Cao@sony.com Reviewed-by: Toyama, Yoshihiro Yoshihiro.Toyama@sony.com --- drivers/usb/host/ehci-msm.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/drivers/usb/host/ehci-msm.c b/drivers/usb/host/ehci-msm.c index ff336082e3..7cb3ae0849 100644 --- a/drivers/usb/host/ehci-msm.c +++ b/drivers/usb/host/ehci-msm.c @@ -47,6 +47,8 @@ static const struct ehci_ops msm_ehci_ops = { .init_after_reset = msm_init_after_reset };
+static int ehci_usb_of_bind(struct udevice *dev); + static int ehci_usb_probe(struct udevice *dev) { struct msm_ehci_priv *p = dev_get_priv(dev); @@ -54,6 +56,7 @@ static int ehci_usb_probe(struct udevice *dev) struct usb_plat *plat = dev_get_plat(dev); struct ehci_hccr *hccr; struct ehci_hcor *hcor; + struct udevice *phydev; int ret;
ret = clk_get_by_name(dev, "core", &p->core_clk); @@ -80,6 +83,10 @@ static int ehci_usb_probe(struct udevice *dev) hcor = (struct ehci_hcor *)((phys_addr_t)hccr + HC_LENGTH(ehci_readl(&(hccr)->cr_capbase)));
+ ret = uclass_get_device_by_name(UCLASS_PHY, "msm8916_usbphy", &phydev); + if (ret) + ehci_usb_of_bind(dev); + ret = generic_setup_phy(dev, &p->phy, 0); if (ret) goto cleanup_iface;