linux-kernel - [PATCH v2 2/2] usb: gadget: fusb300_udc: bug fix of not doing idma reset for each time

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Message-Id: <1364901488-21578-1-git-send-email-yhchen@faraday-tech.com>
Date:	Tue,  2 Apr 2013 11:18:08 +0000
From:	Yuan-Hsin Chen <yuanlmm@...il.com>
To:	balbi@...com, gregkh@...uxfoundation.org,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	Yuan-Hsin Chen <yhchen@...aday-tech.com>
Subject: [PATCH v2 2/2] usb: gadget: fusb300_udc: bug fix of not doing idma reset for each time

Enter IDMA_RESET only when the controller has been reset or
the device has been plugged in to or out from a host. In
IDMA_RESET, we should disable the corresponding PRD interrupt.
Also there is a redundant space eliminated.

fusb300_udc driver is tested on FARADAY platform a369 with
FUSB300 FPGA v1.8

Signed-off-by: Yuan-Hsin Chen <yhchen@...aday-tech.com>
---

v2:
split patch

 drivers/usb/gadget/fusb300_udc.c |    9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/gadget/fusb300_udc.c b/drivers/usb/gadget/fusb300_udc.c
index c20cc58..c4dc906 100644
--- a/drivers/usb/gadget/fusb300_udc.c
+++ b/drivers/usb/gadget/fusb300_udc.c
@@ -930,12 +930,15 @@ static void fusb300_wait_idma_finished(struct fusb300_ep *ep)
 
 	fusb300_clear_int(ep->fusb300, FUSB300_OFFSET_IGR0,
 		FUSB300_IGR0_EPn_PRD_INT(ep->epnum));
+	return;
+
 IDMA_RESET:
-	fusb300_clear_int(ep->fusb300, FUSB300_OFFSET_IGER0,
-		FUSB300_IGER0_EEPn_PRD_INT(ep->epnum));
+	reg = ioread32(ep->fusb300->reg + FUSB300_OFFSET_IGER0);
+	reg &= ~FUSB300_IGER0_EEPn_PRD_INT(ep->epnum);
+	iowrite32(reg, ep->fusb300->reg + FUSB300_OFFSET_IGER0);
 }
 
-static void  fusb300_set_idma(struct fusb300_ep *ep,
+static void fusb300_set_idma(struct fusb300_ep *ep,
 			struct fusb300_request *req)
 {
 	dma_addr_t d;
-- 
1.7.4.1

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