diff options
| author | Hans de Goede <hdegoede@redhat.com> | 2016-09-23 16:40:56 +0300 |
|---|---|---|
| committer | Kishon Vijay Abraham I <kishon@ti.com> | 2016-11-18 18:19:16 +0530 |
| commit | 5d04c883797209f566538e27441b2563afe4e9b9 (patch) | |
| tree | 6f651f0b5c9131d6b9aba1dc673e10e34a14ad17 /drivers/phy | |
| parent | e4d5973f9cba4eeeda239edef765b116865e006f (diff) | |
phy_sun4i_usb: set_mode: Allow using set_mode to force end the current session
The sunxi musb has a bug where sometimes it will generate a babble
error on device disconnect instead of a disconnect irq. When this
happens the musb-controller switches from host mode to device mode
(it clears MUSB_DEVCTL_SESSION and sets MUSB_DEVCTL_BDEVICE) and
gets stuck in this state.
Clearing this requires reporting Vbus low for 200 or more ms, but
on some devices Vbus is simply always high (host-only mode, no Vbus
control).
This commit modifies sun4i_usb_phy_set_mode so that it will force
end the current session when called with the current mode, before this
commit calling set_mode with the current mode was a nop since id_det
would stay the same resulting in the detect_work not doing anything.
This allows the sunxi-musb glue to use sun4i_usb_phy_set_mode to force
end the current session without changing the mode, to fixup the stuck
state after a babble error.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Diffstat (limited to 'drivers/phy')
| -rw-r--r-- | drivers/phy/phy-sun4i-usb.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/drivers/phy/phy-sun4i-usb.c b/drivers/phy/phy-sun4i-usb.c index fec34f5213c4..bf28a0fdd569 100644 --- a/drivers/phy/phy-sun4i-usb.c +++ b/drivers/phy/phy-sun4i-usb.c @@ -436,25 +436,31 @@ static int sun4i_usb_phy_set_mode(struct phy *_phy, enum phy_mode mode) { struct sun4i_usb_phy *phy = phy_get_drvdata(_phy); struct sun4i_usb_phy_data *data = to_sun4i_usb_phy_data(phy); + int new_mode; if (phy->index != 0) return -EINVAL; switch (mode) { case PHY_MODE_USB_HOST: - data->dr_mode = USB_DR_MODE_HOST; + new_mode = USB_DR_MODE_HOST; break; case PHY_MODE_USB_DEVICE: - data->dr_mode = USB_DR_MODE_PERIPHERAL; + new_mode = USB_DR_MODE_PERIPHERAL; break; case PHY_MODE_USB_OTG: - data->dr_mode = USB_DR_MODE_OTG; + new_mode = USB_DR_MODE_OTG; break; default: return -EINVAL; } - dev_info(&_phy->dev, "Changing dr_mode to %d\n", (int)data->dr_mode); + if (new_mode != data->dr_mode) { + dev_info(&_phy->dev, "Changing dr_mode to %d\n", new_mode); + data->dr_mode = new_mode; + } + + data->id_det = -1; /* Force reprocessing of id */ data->force_session_end = true; queue_delayed_work(system_wq, &data->detect, 0); |