From 52b9e6eb07f739207bd7d4257fdfbb24592d096a Mon Sep 17 00:00:00 2001 From: Felipe Balbi Date: Wed, 25 Feb 2015 16:04:39 -0600 Subject: [PATCH] usb: musb: dsps: remove babble check from dsps irq handler musb->int_usb already contains the correct information for musb-core to handle babble. In fact, this very check was just causing a nonsensical babble interrupt storm. With this I can get test.sh to run and, even though all tests fail with timeout, that's still better than locking up the system due to IRQ storm. Also, if I remove g_zero and load g_mass_storage, then everything works fine again. Tested-by: Bin Liu Signed-off-by: Felipe Balbi --- drivers/usb/musb/musb_core.c | 2 +- drivers/usb/musb/musb_dsps.c | 22 ---------------------- 2 files changed, 1 insertion(+), 23 deletions(-) diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c index 7ac69799a1db..d7730c7e7938 100644 --- a/drivers/usb/musb/musb_core.c +++ b/drivers/usb/musb/musb_core.c @@ -879,7 +879,7 @@ b_host: * the session. */ if (power & MUSB_POWER_HSMODE) { - ERR("Stopping host session -- babble\n"); + dev_err(musb->controller, "Babble\n"); musb_writeb(musb->mregs, MUSB_DEVCTL, 0); if (is_host_active(musb)) { diff --git a/drivers/usb/musb/musb_dsps.c b/drivers/usb/musb/musb_dsps.c index af614f49cd98..8f96e79dd069 100644 --- a/drivers/usb/musb/musb_dsps.c +++ b/drivers/usb/musb/musb_dsps.c @@ -330,28 +330,6 @@ static irqreturn_t dsps_interrupt(int irq, void *hci) dev_dbg(musb->controller, "usbintr (%x) epintr(%x)\n", usbintr, epintr); - /* - * DRVVBUS IRQs are the only proxy we have (a very poor one!) for - * DSPS IP's missing ID change IRQ. We need an ID change IRQ to - * switch appropriately between halves of the OTG state machine. - * Managing DEVCTL.SESSION per Mentor docs requires that we know its - * value but DEVCTL.BDEVICE is invalid without DEVCTL.SESSION set. - * Also, DRVVBUS pulses for SRP (but not at 5V) ... - */ - if (is_host_active(musb) && usbintr & MUSB_INTR_BABBLE) { - pr_info("CAUTION: musb: Babble Interrupt Occurred\n"); - - /* - * When a babble condition occurs, the musb controller removes - * the session and is no longer in host mode. Hence, all - * devices connected to its root hub get disconnected. - * - * Hand this error down to the musb core isr, so it can - * recover. - */ - musb->int_usb = MUSB_INTR_BABBLE | MUSB_INTR_DISCONNECT; - musb->int_tx = musb->int_rx = 0; - } if (usbintr & ((1 << wrp->drvvbus) << wrp->usb_shift)) { int drvvbus = dsps_readl(reg_base, wrp->status); -- 2.20.1