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can: rockchip_canfd: prepare to use full TX-FIFO depth

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So far the TX-FIFO is only used with a depth of 1, although the
hardware offers a depth of 2.

The workaround for the chips that are affected by erratum 6, i.e. EFF
frames may be send as standard frames, is to re-send the EFF frame.
This means the driver cannot queue the next frame for sending, as long
ad the EFF frame has not been successfully send out.

Introduce rkcanfd_get_effective_tx_free() that returns "0" space in
the TX-FIFO if an EFF frame is pending and the actual free space in
the TX-FIFO otherwise. Then replace rkcanfd_get_tx_free() with
rkcanfd_get_effective_tx_free() everywhere.

Tested-by: Alibek Omarov <a1ba.omarov@gmail.com>
Acked-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patch.msgid.link/20240904-rockchip-canfd-v5-16-8ae22bcb27cc@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Marc Kleine-Budde 2024-01-17 18:56:35 +01:00
parent 669904d146
commit ae002cc32e
3 changed files with 38 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/can/rockchip/rockchip_canfd-rx.c
View File

@ -124,7 +124,7 @@ static int rkcanfd_rxstx_filter(struct rkcanfd_priv *priv,
WRITE_ONCE(priv->tx_tail, priv->tx_tail + 1);
netif_subqueue_completed_wake(priv->ndev, 0, 1, frame_len,
rkcanfd_get_tx_free(priv),
rkcanfd_get_effective_tx_free(priv),
RKCANFD_TX_START_THRESHOLD);
*tx_done = true;

38
drivers/net/can/rockchip/rockchip_canfd-tx.c
View File

@ -8,6 +8,40 @@
#include "rockchip_canfd.h"
static bool rkcanfd_tx_tail_is_eff(const struct rkcanfd_priv *priv)
{
const struct canfd_frame *cfd;
const struct sk_buff *skb;
unsigned int tx_tail;
if (!rkcanfd_get_tx_pending(priv))
return false;
tx_tail = rkcanfd_get_tx_tail(priv);
skb = priv->can.echo_skb[tx_tail];
if (!skb) {
netdev_err(priv->ndev,
"%s: echo_skb[%u]=NULL tx_head=0x%08x tx_tail=0x%08x\n",
__func__, tx_tail,
priv->tx_head, priv->tx_tail);
return false;
}
cfd = (struct canfd_frame *)skb->data;
return cfd->can_id & CAN_EFF_FLAG;
}
unsigned int rkcanfd_get_effective_tx_free(const struct rkcanfd_priv *priv)
{
if (priv->devtype_data.quirks & RKCANFD_QUIRK_RK3568_ERRATUM_6 &&
rkcanfd_tx_tail_is_eff(priv))
return 0;
return rkcanfd_get_tx_free(priv);
}
static void rkcanfd_start_xmit_write_cmd(const struct rkcanfd_priv *priv,
const u32 reg_cmd)
{
@ -42,7 +76,7 @@ int rkcanfd_start_xmit(struct sk_buff *skb, struct net_device *ndev)
return NETDEV_TX_OK;
if (!netif_subqueue_maybe_stop(priv->ndev, 0,
rkcanfd_get_tx_free(priv),
rkcanfd_get_effective_tx_free(priv),
RKCANFD_TX_STOP_THRESHOLD,
RKCANFD_TX_START_THRESHOLD)) {
if (net_ratelimit())
@ -99,7 +133,7 @@ int rkcanfd_start_xmit(struct sk_buff *skb, struct net_device *ndev)
rkcanfd_start_xmit_write_cmd(priv, reg_cmd);
netif_subqueue_maybe_stop(priv->ndev, 0,
rkcanfd_get_tx_free(priv),
rkcanfd_get_effective_tx_free(priv),
RKCANFD_TX_STOP_THRESHOLD,
RKCANFD_TX_START_THRESHOLD);

1
drivers/net/can/rockchip/rockchip_canfd.h
View File

@ -533,6 +533,7 @@ int rkcanfd_handle_rx_int(struct rkcanfd_priv *priv);
void rkcanfd_timestamp_init(struct rkcanfd_priv *priv);
unsigned int rkcanfd_get_effective_tx_free(const struct rkcanfd_priv *priv);
void rkcanfd_xmit_retry(struct rkcanfd_priv *priv);
int rkcanfd_start_xmit(struct sk_buff *skb, struct net_device *ndev);
void rkcanfd_handle_tx_done_one(struct rkcanfd_priv *priv, const u32 ts,