netdev - [PATCH] can: flexcan: disable completely the ECC mechanism

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Date:   Thu, 15 Aug 2019 08:00:26 +0000
From:   Joakim Zhang <qiangqing.zhang@....com>
To:     "mkl@...gutronix.de" <mkl@...gutronix.de>,
        "linux-can@...r.kernel.org" <linux-can@...r.kernel.org>
CC:     "wg@...ndegger.com" <wg@...ndegger.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "stefan@...er.ch" <stefan@...er.ch>,
        dl-linux-imx <linux-imx@....com>,
        Joakim Zhang <qiangqing.zhang@....com>
Subject: [PATCH] can: flexcan: disable completely the ECC mechanism

The ECC(memory error detection and correction) mechanism can be
activated or not, controlled by the ECCDIS bit in CAN_MECR. When
disabled, updates on indications and reporting registers are stopped.
So if want to disable ECC completely, had better assert ECCDIS bit,
not just mask the related interrupts.

Fixes:cdce844865be("can: flexcan: add vf610 support for FlexCAN")
Signed-off-by: Joakim Zhang <qiangqing.zhang@....com>
---
 drivers/net/can/flexcan.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index def8cbbc04e8..6a48333b40c7 100644
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -1428,6 +1428,7 @@ static int flexcan_chip_start(struct net_device *dev)
 		reg_mecr = priv->read(&regs->mecr);
 		reg_mecr &= ~FLEXCAN_MECR_ECRWRDIS;
 		priv->write(reg_mecr, &regs->mecr);
+		reg_mecr |= FLEXCAN_MECR_ECCDIS;
 		reg_mecr &= ~(FLEXCAN_MECR_NCEFAFRZ | FLEXCAN_MECR_HANCEI_MSK |
 			      FLEXCAN_MECR_FANCEI_MSK);
 		priv->write(reg_mecr, &regs->mecr);
-- 
2.17.1