[PATCH 10/12] can: kvaser_pciefd: Add len8_dlc support

[Jimmy Assarsson <extja@xxxxxxxxxx>]

Add support for the Classical CAN raw DLC functionality to send and receive
DLC values from 9 .. 15.

Signed-off-by: Jimmy Assarsson <extja@xxxxxxxxxx>
---
 drivers/net/can/kvaser_pciefd.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/net/can/kvaser_pciefd.c b/drivers/net/can/kvaser_pciefd.c
index feef044c6b0a..3237c71afd2b 100644
--- a/drivers/net/can/kvaser_pciefd.c
+++ b/drivers/net/can/kvaser_pciefd.c
@@ -572,15 +572,19 @@ static int kvaser_pciefd_prepare_tx_packet(struct kvaser_pciefd_tx_packet *p,
 		p->header[0] |= KVASER_PCIEFD_RPACKET_IDE;
 
 	p->header[0] |= cf->can_id & CAN_EFF_MASK;
-	p->header[1] |= can_fd_len2dlc(cf->len) << KVASER_PCIEFD_RPACKET_DLC_SHIFT;
 	p->header[1] |= KVASER_PCIEFD_TPACKET_AREQ;
 
 	if (can_is_canfd_skb(skb)) {
+		p->header[1] |= can_fd_len2dlc(cf->len) << KVASER_PCIEFD_RPACKET_DLC_SHIFT;
 		p->header[1] |= KVASER_PCIEFD_RPACKET_FDF;
 		if (cf->flags & CANFD_BRS)
 			p->header[1] |= KVASER_PCIEFD_RPACKET_BRS;
 		if (cf->flags & CANFD_ESI)
 			p->header[1] |= KVASER_PCIEFD_RPACKET_ESI;
+	} else {
+		p->header[1] |= can_get_cc_dlc((struct can_frame *)cf,
+					       can->can.ctrlmode)
+				<< KVASER_PCIEFD_RPACKET_DLC_SHIFT;
 	}
 
 	p->header[1] |= seq & KVASER_PCIEFD_PACKET_SEQ_MSK;
@@ -816,7 +820,8 @@ static int kvaser_pciefd_setup_can_ctrls(struct kvaser_pciefd *pcie)
 
 		can->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY |
 					      CAN_CTRLMODE_FD |
-					      CAN_CTRLMODE_FD_NON_ISO;
+					      CAN_CTRLMODE_FD_NON_ISO |
+					      CAN_CTRLMODE_CC_LEN8_DLC;
 
 		status = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_STAT_REG);
 		if (!(status & KVASER_PCIEFD_KCAN_STAT_FD)) {
@@ -977,12 +982,14 @@ static int kvaser_pciefd_handle_data_packet(struct kvaser_pciefd *pcie,
 	struct can_priv *priv;
 	struct net_device_stats *stats;
 	u8 ch_id = (p->header[1] >> KVASER_PCIEFD_PACKET_CHID_SHIFT) & 0x7;
+	u8 dlc;
 
 	if (ch_id >= pcie->nr_channels)
 		return -EIO;
 
 	priv = &pcie->can[ch_id]->can;
 	stats = &priv->dev->stats;
+	dlc = (p->header[1] >> KVASER_PCIEFD_RPACKET_DLC_SHIFT) & 0xf;
 
 	if (p->header[1] & KVASER_PCIEFD_RPACKET_FDF) {
 		skb = alloc_canfd_skb(priv->dev, &cf);
@@ -991,6 +998,7 @@ static int kvaser_pciefd_handle_data_packet(struct kvaser_pciefd *pcie,
 			return -ENOMEM;
 		}
 
+		cf->len = can_fd_dlc2len(dlc);
 		if (p->header[1] & KVASER_PCIEFD_RPACKET_BRS)
 			cf->flags |= CANFD_BRS;
 
@@ -1002,14 +1010,13 @@ static int kvaser_pciefd_handle_data_packet(struct kvaser_pciefd *pcie,
 			stats->rx_dropped++;
 			return -ENOMEM;
 		}
+		can_frame_set_cc_len((struct can_frame *)cf, dlc, priv->ctrlmode);
 	}
 
 	cf->can_id = p->header[0] & CAN_EFF_MASK;
 	if (p->header[0] & KVASER_PCIEFD_RPACKET_IDE)
 		cf->can_id |= CAN_EFF_FLAG;
 
-	cf->len = can_fd_dlc2len(p->header[1] >> KVASER_PCIEFD_RPACKET_DLC_SHIFT);
-
 	if (p->header[0] & KVASER_PCIEFD_RPACKET_RTR) {
 		cf->can_id |= CAN_RTR_FLAG;
 	} else {
-- 
2.40.0