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musb: sunxi: Force session end on babble errors in host-mode

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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>
This commit is contained in:
Hans de Goede 2016-11-21 08:59:23 -06:00 committed by Greg Kroah-Hartman
parent d24b63abf4
commit 454f83d5e6
1 changed files with 15 additions and 0 deletions
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15
drivers/usb/musb/sunxi.c
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@ -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,