wireguard-linux/drivers/net/can/rcar, branch stable

can: rcar_canfd: change the initializing flow for clocks and resets

2026-07-29T10:00:00Z

Testing CANFD on RZ/G3E shows that many registers do not reset to their initial values with the current flow of deasserting resets first and then enabling clocks. Based on the HW manual, clocks should be supplied first and the resets deasserted afterward. section 7.4.3 Procedure for Activating Modules: RZ/G2L section 4.4.9.3 Procedure for Starting up Units: RZ/G3E So, update the order of the initializing flow for resets and clocks to match the hardware manual, resetting all CANFD registers to their initial values. Also update rcar_canfd_global_deinit() to assert resets before disabling clocks, so the teardown path mirrors the new init ordering. Fixes: 76e9353a80e9 ("can: rcar_canfd: Add support for RZ/G2L family") Signed-off-by: Tu Nguyen Signed-off-by: Biju Das Tested-by: Claudiu Beznea Reviewed-by: Geert Uytterhoeven Reviewed-by: Vincent Mailhol Link: https://patch.msgid.link/20260625135216.130450-1-biju.das.jz@bp.renesas.com Cc: stable@kernel.org Signed-off-by: Marc Kleine-Budde

can: rcar_can: Convert to FIELD_MODIFY()

2026-04-01T07:27:58Z

Use the FIELD_MODIFY() helper instead of open-coding the same operation. Signed-off-by: Geert Uytterhoeven Link: https://patch.msgid.link/ee2e6aaacd5e061c972716ecaf8a929be7ef5f2e.1772705647.git.geert+renesas@glider.be Signed-off-by: Marc Kleine-Budde

can: rcar_canfd: Add RZ/T2H support

2026-01-16T19:51:18Z

The CAN-FD IP on the RZ/T2H SoC is similar to R-Car Gen4, but differs in the AFLPN and CFTML bits and supports two channels with eight interrupts. Signed-off-by: Lad Prabhakar Reviewed-by: Geert Uytterhoeven Link: https://patch.msgid.link/20260114154525.3169992-5-prabhakar.mahadev-lad.rj@bp.renesas.com Signed-off-by: Marc Kleine-Budde

can: rcar_canfd: Add support for FD-Only mode

2026-01-16T19:50:10Z

The RZ/{G2L,G3E} and R-Car Gen4 SoCs support additional CAN FD mode called FD-only mode. In this mode, communication in Classical CAN frame format is disabled. Signed-off-by: Biju Das Link: https://patch.msgid.link/20251126155911.320563-3-biju.das.jz@bp.renesas.com Signed-off-by: Marc Kleine-Budde

Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

2025-11-27T20:19:08Z

Conflicts: net/xdp/xsk.c 0ebc27a4c67d ("xsk: avoid data corruption on cq descriptor number") 8da7bea7db69 ("xsk: add indirect call for xsk_destruct_skb") 30ed05adca4a ("xsk: use a smaller new lock for shared pool case") https://lore.kernel.org/20251127105450.4a1665ec@canb.auug.org.au https://lore.kernel.org/eb4eee14-7e24-4d1b-b312-e9ea738fefee@kernel.org Signed-off-by: Jakub Kicinski

can: rcar_canfd: Fix CAN-FD mode as default

2025-11-26T15:26:41Z

The commit 5cff263606a1 ("can: rcar_canfd: Fix controller mode setting") has aligned with the flow mentioned in the hardware manual for all SoCs except R-Car Gen3 and RZ/G2L SoCs. On R-Car Gen4 and RZ/G3E SoCs, due to the wrong logic in the commit[1] sets the default mode to FD-Only mode instead of CAN-FD mode. This patch sets the CAN-FD mode as the default for all SoCs by dropping the rcar_canfd_set_mode() as some SoC requires mode setting in global reset mode, and the rest of the SoCs in channel reset mode and update the rcar_canfd_reset_controller() to take care of these constraints. Moreover, the RZ/G3E and R-Car Gen4 SoCs support 3 modes compared to 2 modes on the R-Car Gen3. Use inverted logic in rcar_canfd_reset_controller() to simplify the code later to support FD-only mode. [1] commit 45721c406dcf ("can: rcar_canfd: Add support for r8a779a0 SoC") Fixes: 5cff263606a1 ("can: rcar_canfd: Fix controller mode setting") Cc: stable@vger.kernel.org Signed-off-by: Biju Das Link: https://patch.msgid.link/20251118123926.193445-1-biju.das.jz@bp.renesas.com Signed-off-by: Marc Kleine-Budde

can: rcar_canfd: Add suspend/resume support

2025-11-26T10:21:56Z

On R-Car Gen3 using PSCI, s2ram powers down the SoC. After resume, the CAN-FD interface no longer works. Trying to bring it up again fails: # ip link set can0 up RTNETLINK answers: Connection timed out # dmesg ... channel 0 communication state failed Fix this by populating the (currently empty) suspend and resume callbacks, to stop/start the individual CAN-FD channels, and (de)initialize the CAN-FD controller. Signed-off-by: Geert Uytterhoeven Tested-by: Biju Das Signed-off-by: Biju Das Link: https://patch.msgid.link/20251124102837.106973-8-biju.das.jz@bp.renesas.com Signed-off-by: Marc Kleine-Budde

can: rcar_canfd: Convert to DEFINE_SIMPLE_DEV_PM_OPS()

2025-11-26T10:21:56Z

Convert the Renesas R-Car CAN-FD driver from SIMPLE_DEV_PM_OPS() to DEFINE_SIMPLE_DEV_PM_OPS() and pm_sleep_ptr(). This lets us drop the __maybe_unused annotations from its suspend and resume callbacks, and reduces kernel size in case CONFIG_PM or CONFIG_PM_SLEEP is disabled. Signed-off-by: Geert Uytterhoeven Reviewed-by: Biju Das Signed-off-by: Biju Das Link: https://patch.msgid.link/20251124102837.106973-7-biju.das.jz@bp.renesas.com Signed-off-by: Marc Kleine-Budde

can: rcar_canfd: Invert CAN clock and close_candev() order

2025-11-26T10:21:55Z

The CAN clock is enabled before calling open_candev(), and disabled before calling close_candev(). Invert the order of the latter, to restore symmetry. Signed-off-by: Geert Uytterhoeven Reviewed-by: Biju Das Signed-off-by: Biju Das Link: https://patch.msgid.link/20251124102837.106973-6-biju.das.jz@bp.renesas.com Signed-off-by: Marc Kleine-Budde

can: rcar_canfd: Extract rcar_canfd_global_{,de}init()

2025-11-26T10:21:55Z

Extract the code to (de)initialize global state into separate functions, for future reuse. Signed-off-by: Geert Uytterhoeven Signed-off-by: Biju Das Link: https://patch.msgid.link/20251124102837.106973-5-biju.das.jz@bp.renesas.com Signed-off-by: Marc Kleine-Budde