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The EHCI-HCD driver follow the EHCI specification, so after 50ms wait, it clear the PR bit by writting to the PORTSC1 register with value loaded before setting PR. This sequence is ok for our IP when the delay time is exact. But when the timer is slower, some bits like PE, PSPD have been set by controller automatically after the PR is automatically cleared. So the writing to the PORTSC1 will overwrite these bits set by controller. And eventually the driver gets wrong status. We implement the powerup_fixup operation which delays 50ms and will check the PR until it is cleared by controller. And will update the reg value which is written to PORTSC register by EHCI-HCD driver. This is much safer than depending on the delay time to be accurate and aligining with controller's behaiver. Signed-off-by: Ye Li Signed-off-by: Alice Guo --- drivers/usb/host/ehci-mx6.c | 28 +++++++++++++++++++++++++++- 1 file changed, 27 insertions(+), 1 deletion(-) diff --git a/drivers/usb/host/ehci-mx6.c b/drivers/usb/host/ehci-mx6.c index 25907f22612..0b3f1b69657 100644 --- a/drivers/usb/host/ehci-mx6.c +++ b/drivers/usb/host/ehci-mx6.c @@ -265,6 +265,25 @@ int usb_phy_mode(int port) } #endif +static void ehci_mx6_powerup_fixup(struct ehci_ctrl *ctrl, uint32_t *status_reg, + uint32_t *reg) +{ + u32 result; + int usec = 2000; + + mdelay(50); + + do { + result = ehci_readl(status_reg); + udelay(5); + if (!(result & EHCI_PS_PR)) + break; + usec--; + } while (usec > 0); + + *reg = ehci_readl(status_reg); +} + #if !defined(CONFIG_PHY) /* Should be done in the MXS PHY driver */ static void usb_oc_config(struct usbnc_regs *usbnc, int index) @@ -331,6 +350,10 @@ int __weak board_ehci_power(int port, int on) return 0; } +static const struct ehci_ops mx6_ehci_ops = { + .powerup_fixup = ehci_mx6_powerup_fixup, +}; + int ehci_hcd_init(int index, enum usb_init_type init, struct ehci_hccr **hccr, struct ehci_hcor **hcor) { @@ -394,6 +417,8 @@ int ehci_hcd_init(int index, enum usb_init_type init, } #endif + ehci_set_controller_priv(index, NULL, &mx6_ehci_ops); + type = board_usb_phy_mode(index); if (hccr && hcor) { @@ -502,7 +527,8 @@ static int mx6_init_after_reset(struct ehci_ctrl *dev) } static const struct ehci_ops mx6_ehci_ops = { - .init_after_reset = mx6_init_after_reset + .powerup_fixup = ehci_mx6_powerup_fixup, + .init_after_reset = mx6_init_after_reset, }; static int ehci_usb_phy_mode(struct udevice *dev) -- 2.43.0