[PATCH v2 12/14] can: kvaser_pciefd: Add len8_dlc support

[Jimmy Assarsson <extja@kvaser.com>]

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

Signed-off-by: Jimmy Assarsson <extja@kvaser.com>
---
Changes in v2:
  - Use FIELD_{GET,PREP} instead of shifting

 drivers/net/can/kvaser_pciefd.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/net/can/kvaser_pciefd.c b/drivers/net/can/kvaser_pciefd.c
index 8779091c448c..e3d730264462 100644
--- a/drivers/net/can/kvaser_pciefd.c
+++ b/drivers/net/can/kvaser_pciefd.c
@@ -591,15 +591,20 @@ static int kvaser_pciefd_prepare_tx_packet(struct kvaser_pciefd_tx_packet *p,
 		p->header[0] |= KVASER_PCIEFD_RPACKET_IDE;
 
 	p->header[0] |= FIELD_PREP(KVASER_PCIEFD_RPACKET_ID_MASK, cf->can_id);
-	p->header[1] |= FIELD_PREP(KVASER_PCIEFD_RPACKET_DLC_MASK, can_fd_len2dlc(cf->len));
 	p->header[1] |= KVASER_PCIEFD_TPACKET_AREQ;
 
 	if (can_is_canfd_skb(skb)) {
+		p->header[1] |= FIELD_PREP(KVASER_PCIEFD_RPACKET_DLC_MASK,
+					   can_fd_len2dlc(cf->len));
 		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] |=
+			FIELD_PREP(KVASER_PCIEFD_RPACKET_DLC_MASK,
+				   can_get_cc_dlc((struct can_frame *)cf, can->can.ctrlmode));
 	}
 
 	p->header[1] |= FIELD_PREP(KVASER_PCIEFD_PACKET_SEQ_MASK, seq);
@@ -834,7 +839,8 @@ 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)) {
@@ -996,12 +1002,14 @@ static int kvaser_pciefd_handle_data_packet(struct kvaser_pciefd *pcie,
 	struct can_priv *priv;
 	struct net_device_stats *stats;
 	u8 ch_id = FIELD_GET(KVASER_PCIEFD_PACKET_CHID_MASK, p->header[1]);
+	u8 dlc;
 
 	if (ch_id >= pcie->nr_channels)
 		return -EIO;
 
 	priv = &pcie->can[ch_id]->can;
 	stats = &priv->dev->stats;
+	dlc = FIELD_GET(KVASER_PCIEFD_RPACKET_DLC_MASK, p->header[1]);
 
 	if (p->header[1] & KVASER_PCIEFD_RPACKET_FDF) {
 		skb = alloc_canfd_skb(priv->dev, &cf);
@@ -1010,6 +1018,7 @@ 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;
 
@@ -1021,14 +1030,13 @@ 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 = FIELD_GET(KVASER_PCIEFD_RPACKET_ID_MASK, p->header[0]);
 	if (p->header[0] & KVASER_PCIEFD_RPACKET_IDE)
 		cf->can_id |= CAN_EFF_FLAG;
 
-	cf->len = can_fd_dlc2len(FIELD_GET(KVASER_PCIEFD_RPACKET_DLC_MASK, p->header[1]));
-
 	if (p->header[0] & KVASER_PCIEFD_RPACKET_RTR) {
 		cf->can_id |= CAN_RTR_FLAG;
 	} else {
-- 
2.40.0