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    Subject[PATCH 4.14 103/105] can: flexcan: disable completely the ECC mechanism
    Date
    From: Joakim Zhang <qiangqing.zhang@nxp.com>

    [ 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@nxp.com>
    Cc: linux-stable <stable@vger.kernel.org>
    Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    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 7280f3a8aa041..84dd79041285a 100644
    --- a/drivers/net/can/flexcan.c
    +++ b/drivers/net/can/flexcan.c
    @@ -1018,6 +1018,7 @@ static int flexcan_chip_start(struct net_device *dev)
    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);
    --
    2.20.1


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