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

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Date:   Fri, 12 Jul 2019 08:02:47 +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>,
        dl-linux-imx <linux-imx@....com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Joakim Zhang <qiangqing.zhang@....com>
Subject: [PATCH 4/8] can: flexcan: add CANFD BRS support

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

Signed-off-by: Joakim Zhang <qiangqing.zhang@....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