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>

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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

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2

drivers/net/can/rockchip/rockchip_canfd-rx.c

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38

drivers/net/can/rockchip/rockchip_canfd-tx.c

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1

drivers/net/can/rockchip/rockchip_canfd.h

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