diff options
| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2012-10-30 19:52:25 +0100 |
|---|---|---|
| committer | Felipe Balbi <balbi@ti.com> | 2012-10-31 15:22:03 +0200 |
| commit | af5ec14d40e0da1de17fcca2b41c76fae5c2cb9d (patch) | |
| tree | 0bdfddd642e2455e34ece3a5551038a470db61f1 /drivers/usb/musb/musb_core.c | |
| parent | 515ba29cd7b571da45365e4db80c1b6905869ef3 (diff) | |
usb: musb: Perform only write access on MUSB_INTRRXE
This is part of the workaround for AM35x advisory Advisory 1.1.20.
The advisory says that the IPSS bridge can't handle 8 & 16 bit read
access. An 16bit read access to MUSB_INTRRXE results in an 32bit read
access which also reads INTRUSB and therefore may lose interrupts.
This patch uses a shadow register of MUSB_INTRRXE so we only perform
write access to it.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'drivers/usb/musb/musb_core.c')
| -rw-r--r-- | drivers/usb/musb/musb_core.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c index d156fe8bebfa..7ff1986e5e52 100644 --- a/drivers/usb/musb/musb_core.c +++ b/drivers/usb/musb/musb_core.c @@ -725,7 +725,8 @@ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb, /* REVISIT HNP; just force disconnect */ } musb_writew(musb->mregs, MUSB_INTRTXE, musb->epmask); - musb_writew(musb->mregs, MUSB_INTRRXE, musb->epmask & 0xfffe); + musb->intrrxe = musb->epmask & 0xfffe; + musb_writew(musb->mregs, MUSB_INTRRXE, musb->intrrxe); musb_writeb(musb->mregs, MUSB_INTRUSBE, 0xf7); musb->port1_status &= ~(USB_PORT_STAT_LOW_SPEED |USB_PORT_STAT_HIGH_SPEED @@ -947,7 +948,8 @@ void musb_start(struct musb *musb) /* Set INT enable registers, enable interrupts */ musb_writew(regs, MUSB_INTRTXE, musb->epmask); - musb_writew(regs, MUSB_INTRRXE, musb->epmask & 0xfffe); + musb->intrrxe = musb->epmask & 0xfffe; + musb_writew(regs, MUSB_INTRRXE, musb->intrrxe); musb_writeb(regs, MUSB_INTRUSBE, 0xf7); musb_writeb(regs, MUSB_TESTMODE, 0); @@ -986,6 +988,7 @@ static void musb_generic_disable(struct musb *musb) /* disable interrupts */ musb_writeb(mbase, MUSB_INTRUSBE, 0); musb_writew(mbase, MUSB_INTRTXE, 0); + musb->intrrxe = 0; musb_writew(mbase, MUSB_INTRRXE, 0); /* off */ @@ -2122,7 +2125,6 @@ static void musb_save_context(struct musb *musb) musb->context.busctl = musb_read_ulpi_buscontrol(musb->mregs); musb->context.power = musb_readb(musb_base, MUSB_POWER); musb->context.intrtxe = musb_readw(musb_base, MUSB_INTRTXE); - musb->context.intrrxe = musb_readw(musb_base, MUSB_INTRRXE); musb->context.intrusbe = musb_readb(musb_base, MUSB_INTRUSBE); musb->context.index = musb_readb(musb_base, MUSB_INDEX); musb->context.devctl = musb_readb(musb_base, MUSB_DEVCTL); @@ -2196,7 +2198,7 @@ static void musb_restore_context(struct musb *musb) musb_write_ulpi_buscontrol(musb->mregs, musb->context.busctl); musb_writeb(musb_base, MUSB_POWER, musb->context.power); musb_writew(musb_base, MUSB_INTRTXE, musb->context.intrtxe); - musb_writew(musb_base, MUSB_INTRRXE, musb->context.intrrxe); + musb_writew(musb_base, MUSB_INTRRXE, musb->intrrxe); musb_writeb(musb_base, MUSB_INTRUSBE, musb->context.intrusbe); musb_writeb(musb_base, MUSB_DEVCTL, musb->context.devctl); |