[PATCH v3 7/7] USB: gadget: s3c-hsotg: fix interrupt configuration indedicated-fifo mode

[Robert Baldyga]

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@xxxxxxxxxxx>
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
 drivers/usb/gadget/s3c-hsotg.c |   14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/gadget/s3c-hsotg.c b/drivers/usb/gadget/s3c-hsotg.c
index 5c4c41282..d5d951d 100644
--- a/drivers/usb/gadget/s3c-hsotg.c
+++ b/drivers/usb/gadget/s3c-hsotg.c
@@ -2269,15 +2269,19 @@ 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,
-- 
1.7.9.5

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/