linux-kernel - [PATCH net-next-2.6 12/17] can: EG20T PCH: Fix bit timing calculation issue

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Message-ID: <4CE60FBF.8030102@dsn.okisemi.com>
Date:	Fri, 19 Nov 2010 14:48:47 +0900
From:	Tomoya MORINAGA <tomoya-linux@....okisemi.com>
To:	Wolfgang Grandegger <wg@...ndegger.com>,
	Wolfram Sang <w.sang@...gutronix.de>,
	Christian Pellegrin <chripell@...e.org>,
	Barry Song <21cnbao@...il.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	socketcan-core@...ts.berlios.de, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>
CC:	qi.wang@...el.com, yong.y.wang@...el.com,
	andrew.chih.howe.khor@...el.com, joel.clark@...el.com,
	kok.howg.ewe@...el.com, margie.foster@...el.com
Subject: [PATCH net-next-2.6 12/17] can: EG20T PCH: Fix bit timing calculation
 issue

Fix bit timing calculation issue
Modify like use calculated value directly passed by CAN core module.

Signed-off-by: Tomoya MORINAGA <tomoya-linux@....okisemi.com>
---
 drivers/net/can/pch_can.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/can/pch_can.c b/drivers/net/can/pch_can.c
index 7342030..466f011 100644
--- a/drivers/net/can/pch_can.c
+++ b/drivers/net/can/pch_can.c
@@ -800,17 +800,15 @@ static int pch_set_bittiming(struct net_device *ndev)
 	const struct can_bittiming *bt = &priv->can.bittiming;
 	u32 canbit;
 	u32 bepe;
-	u32 brp;
 
 	/* Setting the CCE bit for accessing the Can Timing register. */
 	pch_can_bit_set(&priv->regs->cont, PCH_CTRL_CCE);
 
-	brp = (bt->tq) / (1000000000/PCH_CAN_CLK) - 1;
-	canbit = brp & PCH_MSK_BITT_BRP;
+	canbit = (bt->brp - 1) & PCH_MSK_BITT_BRP;
 	canbit |= (bt->sjw - 1) << PCH_BIT_SJW_SHIFT;
 	canbit |= (bt->phase_seg1 + bt->prop_seg - 1) << PCH_BIT_TSEG1_SHIFT;
 	canbit |= (bt->phase_seg2 - 1) << PCH_BIT_TSEG2_SHIFT;
-	bepe = (brp & PCH_MSK_BRPE_BRPE) >> PCH_BIT_BRPE_BRPE_SHIFT;
+	bepe = ((bt->brp - 1) & PCH_MSK_BRPE_BRPE) >> PCH_BIT_BRPE_BRPE_SHIFT;
 	iowrite32(canbit, &priv->regs->bitt);
 	iowrite32(bepe, &priv->regs->brpe);
 	pch_can_bit_clear(&priv->regs->cont, PCH_CTRL_CCE);
-- 
1.6.0.6

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