diff options
| author | Hans de Goede <hdegoede@redhat.com> | 2016-11-21 17:59:23 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-11-21 19:35:36 +0300 |
| commit | 454f83d5e60110a18f24ffc0d58d2252d09c9a92 (patch) | |
| tree | 7a2bf961047f1666872fc7f9ce718fb99802f19b /drivers/usb/musb/sunxi.c | |
| parent | d24b63abf4bc866ead04660b5265af77ac910abb (diff) | |
| download | linux-454f83d5e60110a18f24ffc0d58d2252d09c9a92.tar.xz | |
musb: sunxi: Force session end on babble errors in host-mode
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 adds a sunxi_musb_recover() callback which makes
sunxi_musb_work call phy_set_mode with the current mode, which
will force end the current session.
This fixes the musb controller getting stuck in this state on systems
without Vbus control; and also fixes the need to unplug the usb-b ->
usb-a cable to get out of this state on systems with Vbus control.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/musb/sunxi.c')
| -rw-r--r-- | drivers/usb/musb/sunxi.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/usb/musb/sunxi.c b/drivers/usb/musb/sunxi.c index 82eba92284c0..d0be0eadd0d9 100644 --- a/drivers/usb/musb/sunxi.c +++ b/drivers/usb/musb/sunxi.c @@ -380,6 +380,20 @@ static int sunxi_musb_set_mode(struct musb *musb, u8 mode) return 0; } +static int sunxi_musb_recover(struct musb *musb) +{ + struct sunxi_glue *glue = dev_get_drvdata(musb->controller->parent); + + /* + * Schedule a phy_set_mode with the current glue->phy_mode value, + * this will force end the current session. + */ + set_bit(SUNXI_MUSB_FL_PHY_MODE_PEND, &glue->flags); + schedule_work(&glue->work); + + return 0; +} + /* * sunxi musb register layout * 0x00 - 0x17 fifo regs, 1 long per fifo @@ -608,6 +622,7 @@ static const struct musb_platform_ops sunxi_musb_ops = { .dma_init = sunxi_musb_dma_controller_create, .dma_exit = sunxi_musb_dma_controller_destroy, .set_mode = sunxi_musb_set_mode, + .recover = sunxi_musb_recover, .set_vbus = sunxi_musb_set_vbus, .pre_root_reset_end = sunxi_musb_pre_root_reset_end, .post_root_reset_end = sunxi_musb_post_root_reset_end, |