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| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2012-10-30 19:52:26 +0100 |
|---|---|---|
| committer | Felipe Balbi <balbi@ti.com> | 2012-10-31 15:22:18 +0200 |
| commit | b18d26f6ad8f00ea5f7c6a12ea52627ca3c3c6e2 (patch) | |
| tree | 651526d8d433418664bcee887f6d1a60ee7946f7 /drivers/usb/musb/musb_core.c | |
| parent | af5ec14d40e0da1de17fcca2b41c76fae5c2cb9d (diff) | |
| download | lwn-b18d26f6ad8f00ea5f7c6a12ea52627ca3c3c6e2.tar.gz lwn-b18d26f6ad8f00ea5f7c6a12ea52627ca3c3c6e2.zip | |
usb: musb: Perform only write access on MUSB_INTRTXE
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_INTRTXE results in an 32bit read
access which also reads INTRRX and therefore may lose interrupts.
This patch uses a shadow register of MUSB_INTRTXE 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 7ff1986e5e52..25a0d8e1be51 100644 --- a/drivers/usb/musb/musb_core.c +++ b/drivers/usb/musb/musb_core.c @@ -724,7 +724,8 @@ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb, if (is_peripheral_active(musb)) { /* REVISIT HNP; just force disconnect */ } - musb_writew(musb->mregs, MUSB_INTRTXE, musb->epmask); + musb->intrtxe = musb->epmask; + musb_writew(musb->mregs, MUSB_INTRTXE, musb->intrtxe); musb->intrrxe = musb->epmask & 0xfffe; musb_writew(musb->mregs, MUSB_INTRRXE, musb->intrrxe); musb_writeb(musb->mregs, MUSB_INTRUSBE, 0xf7); @@ -947,7 +948,8 @@ void musb_start(struct musb *musb) dev_dbg(musb->controller, "<== devctl %02x\n", devctl); /* Set INT enable registers, enable interrupts */ - musb_writew(regs, MUSB_INTRTXE, musb->epmask); + musb->intrtxe = musb->epmask; + musb_writew(regs, MUSB_INTRTXE, musb->intrtxe); musb->intrrxe = musb->epmask & 0xfffe; musb_writew(regs, MUSB_INTRRXE, musb->intrrxe); musb_writeb(regs, MUSB_INTRUSBE, 0xf7); @@ -987,6 +989,7 @@ static void musb_generic_disable(struct musb *musb) /* disable interrupts */ musb_writeb(mbase, MUSB_INTRUSBE, 0); + musb->intrtxe = 0; musb_writew(mbase, MUSB_INTRTXE, 0); musb->intrrxe = 0; musb_writew(mbase, MUSB_INTRRXE, 0); @@ -2124,7 +2127,6 @@ static void musb_save_context(struct musb *musb) musb->context.testmode = musb_readb(musb_base, MUSB_TESTMODE); 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.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); @@ -2197,7 +2199,7 @@ static void musb_restore_context(struct musb *musb) musb_writeb(musb_base, MUSB_TESTMODE, musb->context.testmode); 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_INTRTXE, musb->intrtxe); 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); |