diff options
| author | Stephen Warren <swarren@nvidia.com> | 2014-04-30 15:09:55 -0600 |
|---|---|---|
| committer | Marek Vasut <marex@denx.de> | 2014-05-15 00:21:17 +0200 |
| commit | 9b20fe6f1affdfc7441481dc0acb55eadd80134f (patch) | |
| tree | d5f594acdc8e9509dda572fe3e125cf0303931e7 /drivers | |
| parent | 4180b3dba25c2c28cc4502f1c9f1cbad2a9972b8 (diff) | |
usb: tegra: fix PHY selection code
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/usb/host/ehci-tegra.c | 21 |
1 files changed, 8 insertions, 13 deletions
diff --git a/drivers/usb/host/ehci-tegra.c b/drivers/usb/host/ehci-tegra.c index 38db18e2c9..9a9a1277d1 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; } |