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usb: musb: Perform only write access on MUSB_INTRRXE

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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>
This commit is contained in:
Sebastian Andrzej Siewior 2012-10-30 19:52:25 +01:00 committed by Felipe Balbi
parent 515ba29cd7
commit af5ec14d40
3 changed files with 12 additions and 11 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
drivers/usb/musb/musb_core.c
View file

@ -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);

3
drivers/usb/musb/musb_core.h
View file

@ -288,7 +288,7 @@ struct musb_csr_regs {
struct musb_context_registers {
u8 power;
u16 intrtxe, intrrxe;
u16 intrtxe;
u8 intrusbe;
u16 frame;
u8 index, testmode;
@ -313,6 +313,7 @@ struct musb {
struct work_struct irq_work;
u16 hwvers;
u16 intrrxe;
/* this hub status bit is reserved by USB 2.0 and not seen by usbcore */
#define MUSB_PORT_STAT_RESUME (1 << 31)

10
drivers/usb/musb/musb_gadget.c
View file

@ -1108,7 +1108,6 @@ static int musb_gadget_enable(struct usb_ep *ep,
musb_writew(regs, MUSB_TXCSR, csr);
} else {
u16 int_rxe = musb_readw(mbase, MUSB_INTRRXE);
if (hw_ep->is_shared_fifo)
musb_ep->is_in = 0;
@ -1120,8 +1119,8 @@ static int musb_gadget_enable(struct usb_ep *ep,
goto fail;
}
int_rxe |= (1 << epnum);
musb_writew(mbase, MUSB_INTRRXE, int_rxe);
musb->intrrxe |= (1 << epnum);
musb_writew(mbase, MUSB_INTRRXE, musb->intrrxe);
/* REVISIT if can_bulk_combine() use by updating "tmp"
* likewise high bandwidth periodic rx
@ -1214,9 +1213,8 @@ static int musb_gadget_disable(struct usb_ep *ep)
musb_writew(musb->mregs, MUSB_INTRTXE, int_txe);
musb_writew(epio, MUSB_TXMAXP, 0);
} else {
u16 int_rxe = musb_readw(musb->mregs, MUSB_INTRRXE);
int_rxe &= ~(1 << epnum);
musb_writew(musb->mregs, MUSB_INTRRXE, int_rxe);
musb->intrrxe &= ~(1 << epnum);
musb_writew(musb->mregs, MUSB_INTRRXE, musb->intrrxe);
musb_writew(epio, MUSB_RXMAXP, 0);
}