From 6f4a36f0ec7d46a7a72edcab838cdcd65eacfa0f Mon Sep 17 00:00:00 2001 From: Jonathan Liu Date: Mon, 9 Oct 2017 22:46:12 -0500 Subject: usb: musb: Check for host-mode using is_host_active() on reset interrupt commit 445ef61543da3db5b699f87fb0aa4f227165f6ed upstream. 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_HM/MUSB_DEVCTL_SESSION and sets MUSB_DEVCTL_BDEVICE) and gets stuck in this state. The babble error is misdetected as a bus reset because MUSB_DEVCTL_HM was cleared. To fix this, use is_host_active() rather than (devctl & MUSB_DEVCTL_HM) to detect babble error so that sunxi musb babble recovery can handle it by restoring the mode. This information is provided by the driver logic and does not rely on register contents. Signed-off-by: Jonathan Liu Signed-off-by: Bin Liu Signed-off-by: Greg Kroah-Hartman --- drivers/usb/musb/musb_core.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c index a6b6b1cf1317..aac28d998073 100644 --- a/drivers/usb/musb/musb_core.c +++ b/drivers/usb/musb/musb_core.c @@ -890,7 +890,7 @@ b_host: */ if (int_usb & MUSB_INTR_RESET) { handled = IRQ_HANDLED; - if (devctl & MUSB_DEVCTL_HM) { + if (is_host_active(musb)) { /* * When BABBLE happens what we can depends on which * platform MUSB is running, because some platforms @@ -900,9 +900,7 @@ b_host: * drop the session. */ dev_err(musb->controller, "Babble\n"); - - if (is_host_active(musb)) - musb_recover_from_babble(musb); + musb_recover_from_babble(musb); } else { musb_dbg(musb, "BUS RESET as %s", usb_otg_state_string(musb->xceiv->otg->state)); -- cgit v1.2.3