diff options
| author | Robert Baldyga <r.baldyga@samsung.com> | 2013-09-19 11:50:23 +0200 |
|---|---|---|
| committer | Felipe Balbi <balbi@ti.com> | 2013-10-15 08:45:50 -0500 |
| commit | 8acc8296f94349e7a933dd97e8f5d0ec16d4b4db (patch) | |
| tree | 43892f1ed534e3bc34ea133ddc0bc7c36e09bbb4 /drivers/usb/gadget/s3c-hsotg.c | |
| parent | bd9ef7bf0c8e129f24b28366e6c7e9ea92a7aed6 (diff) | |
usb: gadget: s3c-hsotg: fix interrupt configuration in dedicated-fifo mode
In dedicated-fifo mode TxFIFOEmpty interrupt should be asserted when TxFIFO
for this endpoint is completly empty, so NPTxFEmpLvl and PTxFEmpLvl bits are
set in GAHBCFG register.
In DIEPMSK register INTknTXFEmpMsk is set, becouse it's needed to indicate
FIFO Empty state.
Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'drivers/usb/gadget/s3c-hsotg.c')
| -rw-r--r-- | drivers/usb/gadget/s3c-hsotg.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/drivers/usb/gadget/s3c-hsotg.c b/drivers/usb/gadget/s3c-hsotg.c index 70615585b48..a9cae1ff044 100644 --- a/drivers/usb/gadget/s3c-hsotg.c +++ b/drivers/usb/gadget/s3c-hsotg.c @@ -2304,15 +2304,19 @@ static void s3c_hsotg_core_init(struct s3c_hsotg *hsotg) GAHBCFG_HBstLen_Incr4, hsotg->regs + GAHBCFG); else - writel(GAHBCFG_GlblIntrEn, hsotg->regs + GAHBCFG); + writel(((hsotg->dedicated_fifos) ? (GAHBCFG_NPTxFEmpLvl | + GAHBCFG_PTxFEmpLvl) : 0) | + GAHBCFG_GlblIntrEn, + hsotg->regs + GAHBCFG); /* - * Enabling INTknTXFEmpMsk here seems to be a big mistake, we end - * up being flooded with interrupts if the host is polling the - * endpoint to try and read data. + * If INTknTXFEmpMsk is enabled, it's important to disable ep interrupts + * when we have no data to transfer. Otherwise we get being flooded by + * interrupts. */ - writel(((hsotg->dedicated_fifos) ? DIEPMSK_TxFIFOEmpty : 0) | + writel(((hsotg->dedicated_fifos) ? DIEPMSK_TxFIFOEmpty | + DIEPMSK_INTknTXFEmpMsk : 0) | DIEPMSK_EPDisbldMsk | DIEPMSK_XferComplMsk | DIEPMSK_TimeOUTMsk | DIEPMSK_AHBErrMsk | DIEPMSK_INTknEPMisMsk, |