[PATCH 4.4 41/43] can: flexcan: disable completely the ECC mechanism

[Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>]

From: Joakim Zhang <qiangqing.zhang@xxxxxxx>

[ Upstream commit 5e269324db5adb2f5f6ec9a93a9c7b0672932b47 ]

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@xxxxxxx>
Cc: linux-stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/net/can/flexcan.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -923,6 +923,7 @@ static int flexcan_chip_start(struct net
 		reg_mecr = flexcan_read(&regs->mecr);
 		reg_mecr &= ~FLEXCAN_MECR_ECRWRDIS;
 		flexcan_write(reg_mecr, &regs->mecr);
+		reg_mecr |= FLEXCAN_MECR_ECCDIS;
 		reg_mecr &= ~(FLEXCAN_MECR_NCEFAFRZ | FLEXCAN_MECR_HANCEI_MSK |
 			      FLEXCAN_MECR_FANCEI_MSK);
 		flexcan_write(reg_mecr, &regs->mecr);