From: Stephen Warren swarren@nvidia.com
The TRM for Tegra30 and later all state that USBMODE_CM_HC must be set before writing to hostpc1_devlc to select which PHY to use for a USB controller. However, neither init_{utmi,ulpi}_usb_controller() do this today, so the register writes they perform for PHY selection do not work.
For the UTMI case, this was hacked around in commit 7e44d9320ed4 "ARM: Tegra: USB: EHCI: Add support for Tegra30/Tegra114" by adding code to ehci_hcd_init() which sets USBMODE_CM_HC and duplicates the PHY selection register write. This code doesn't cover the ULPI case, so I wouldn't be surprised if ULPI doesn't work with the current code, unless the ordering requirement only ends up being an issue in HW for UTMI not ULPI.
This patch fixes init_{utmi,ulpi}_usb_controller() to correctly set USBMODE_CM_HC before selecting the PHY. Now that this works, we can remove the duplicate UTMI-specific code in ehci_hcd_init(), thus simplifying that function.
Cc: Jim Lin jilin@nvidia.com Cc: Stefan Agner stefan@agner.ch Signed-off-by: Stephen Warren swarren@nvidia.com --- drivers/usb/host/ehci-tegra.c | 21 ++++++++------------- 1 file changed, 8 insertions(+), 13 deletions(-)
diff --git a/drivers/usb/host/ehci-tegra.c b/drivers/usb/host/ehci-tegra.c index 38db18e2c9ea..9a9a1277d160 100644 --- a/drivers/usb/host/ehci-tegra.c +++ b/drivers/usb/host/ehci-tegra.c @@ -496,6 +496,10 @@ static int init_utmi_usb_controller(struct fdt_usb *config) clrbits_le32(&usbctlr->port_sc1, STS); } #else + /* Set to Host mode after Controller Reset was done */ + clrsetbits_le32(&usbctlr->usb_mode, USBMODE_CM_HC, + USBMODE_CM_HC); + /* Select PHY interface after setting host mode */ clrsetbits_le32(&usbctlr->hostpc1_devlc, PTS_MASK, PTS_UTMI << PTS_SHIFT); clrbits_le32(&usbctlr->hostpc1_devlc, STS); @@ -561,6 +565,10 @@ static int init_ulpi_usb_controller(struct fdt_usb *config) clrsetbits_le32(&usbctlr->port_sc1, PTS_MASK, PTS_ULPI << PTS_SHIFT); #else + /* Set to Host mode after Controller Reset was done */ + clrsetbits_le32(&usbctlr->usb_mode, USBMODE_CM_HC, + USBMODE_CM_HC); + /* Select PHY interface after setting host mode */ clrsetbits_le32(&usbctlr->hostpc1_devlc, PTS_MASK, PTS_ULPI << PTS_SHIFT); #endif @@ -788,19 +796,6 @@ success: *hccr = (struct ehci_hccr *)&usbctlr->cap_length; *hcor = (struct ehci_hcor *)&usbctlr->usb_cmd;
- if (controller->has_hostpc) { - /* Set to Host mode after Controller Reset was done */ - clrsetbits_le32(&usbctlr->usb_mode, USBMODE_CM_HC, - USBMODE_CM_HC); - /* Select UTMI parallel interface after setting host mode */ - if (config->utmi) { - clrsetbits_le32((char *)&usbctlr->usb_cmd + - HOSTPC1_DEVLC, PTS_MASK, - PTS_UTMI << PTS_SHIFT); - clrbits_le32((char *)&usbctlr->usb_cmd + - HOSTPC1_DEVLC, STS); - } - } return 0; }