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usb: gadget: s3c-hsotg: fix interrupt configuration in dedicated-fifo mode

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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>
This commit is contained in:
Robert Baldyga 2013-09-19 11:50:23 +02:00 committed by Felipe Balbi
parent bd9ef7bf0c
commit 8acc8296f9
1 changed files with 9 additions and 5 deletions
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14
drivers/usb/gadget/s3c-hsotg.c
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@ -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,