From: Vivek Yadav <vivek.2311@xxxxxxxxxxx> When a frame in CAN FD format has reached the data phase, the next CAN event (error or valid frame) will be shown in DLEC. Utilize the dedicated flag (Data Phase Last Error Code: DLEC flag) to determine the type of last error that occurred in the data phase of a CAN-FD frame and handle the bus errors. Signed-off-by: Vivek Yadav <vivek.2311@xxxxxxxxxxx> Link: https://lore.kernel.org/all/20221018081934.1336690-1-mkl@xxxxxxxxxxxxxx Reviewed-by: Chandrasekar Ramakrishnan <rcsekar@xxxxxxxxxxx> Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx> --- drivers/net/can/m_can/m_can.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c index ebdd3c164d7b..34c76ee87c6e 100644 --- a/drivers/net/can/m_can/m_can.c +++ b/drivers/net/can/m_can/m_can.c @@ -156,6 +156,7 @@ enum m_can_reg { #define PSR_EW BIT(6) #define PSR_EP BIT(5) #define PSR_LEC_MASK GENMASK(2, 0) +#define PSR_DLEC_MASK GENMASK(10, 8) /* Interrupt Register (IR) */ #define IR_ALL_INT 0xffffffff @@ -875,9 +876,17 @@ static int m_can_handle_bus_errors(struct net_device *dev, u32 irqstatus, /* handle lec errors on the bus */ if (cdev->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) { u8 lec = FIELD_GET(PSR_LEC_MASK, psr); + u8 dlec = FIELD_GET(PSR_DLEC_MASK, psr); - if (is_lec_err(lec)) + if (is_lec_err(lec)) { + netdev_dbg(dev, "Arbitration phase error detected\n"); work_done += m_can_handle_lec_err(dev, lec); + } + + if (is_lec_err(dlec)) { + netdev_dbg(dev, "Data phase error detected\n"); + work_done += m_can_handle_lec_err(dev, dlec); + } } /* handle protocol errors in arbitration phase */ -- 2.35.1
