[PATCH 4/8] can: flexcan: add CANFD BRS support

[Joakim Zhang]

This patch intends to add CAN FD BitRate Switch(BRS) support in driver.

Signed-off-by: Joakim Zhang <qiangqing.zh...@nxp.com>
---
 drivers/net/can/flexcan.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index 23e9407e33ff..4956ef64944a 100644
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -684,9 +684,13 @@ static netdev_tx_t flexcan_start_xmit(struct sk_buff *skb, 
struct net_device *de
        if (cfd->can_id & CAN_RTR_FLAG)
                ctrl |= FLEXCAN_MB_CNT_RTR;
 
-       if (can_is_canfd_skb(skb))
+       if (can_is_canfd_skb(skb)) {
                ctrl |= FLEXCAN_MB_CNT_EDL;
 
+               if (cfd->flags & CANFD_BRS)
+                       ctrl |= FLEXCAN_MB_CNT_BRS;
+       }
+
        for (i = 0; i < cfd->len; i += sizeof(u32)) {
                data = be32_to_cpup((__be32 *)&cfd->data[i]);
                priv->write(data, &priv->tx_mb->data[i / sizeof(u32)]);
@@ -907,6 +911,9 @@ static unsigned int flexcan_mailbox_read(struct 
can_rx_offload *offload, bool dr
 
                if (reg_ctrl & FLEXCAN_MB_CNT_EDL) {
                        cfd->len = can_dlc2len(get_canfd_dlc((reg_ctrl >> 16) & 
0x0F));
+
+                       if (reg_ctrl & FLEXCAN_MB_CNT_BRS)
+                               cfd->flags |= CANFD_BRS;
                } else {
                        cfd->len = get_can_dlc((reg_ctrl >> 16) & 0x0F);
 
-- 
2.17.1