Merge patch series "Add R-Car CAN-FD suspend/resume support"

Biju <biju.das.au@gmail.com> says:

From: Biju Das <biju.das.jz@bp.renesas.com>

This patch series adds proper suspend/resume support to the Renesas
R-Car CAN-FD controller driver, after the customary cleanups and fixes.
It aims to fix CAN-FD operation after resume from s2ram on systems where
PSCI powers down the SoC.

This patch series has been tested on RZ/G3E SMARC EVK and RZ/G2L SMARC
EVK.

This patch series depend upon [1]
[1] https://lore.kernel.org/all/20251123112326.128448-1-biju.das.jz@bp.renesas.com/

v2->v3:
 * Updated commit header and description for patch#3
 * Collected tags.
v1->v2:
 * Added logs from RZ/G3E
 * Collected tags.
 * Moved enabling of RAM clk from probe().
 * Added RAM clk handling in rcar_canfd_global_{,de}init().
 * Fixed the typo in error path of rcar_canfd_resume().

Logs from RZ/G3E:
root@smarc-rzg3e:~# /canfd_t_003_all.sh
 [INFO] Testing can0<->can1 with bitrate 1000000 and dbitrate 4000000
 [INFO] Bringing down can0 can1
 [INFO] Bringing up can0 can1
 [INFO] Testing can1 as producer and can0 as consumer
[  541.705921] can: controller area network core
[  541.710369] NET: Registered PF_CAN protocol family
[  541.753974] can: raw protocol
 [INFO] Testing can0 as producer and can1 as consumer
 [INFO] Testing can0<->can1 with bitrate 500000 and dbitrate 2000000
 [INFO] Bringing down can0 can1
 [INFO] Bringing up can0 can1
 [INFO] Testing can1 as producer and can0 as consumer
 [INFO] Testing can0 as producer and can1 as consumer
 [INFO] Testing can0<->can1 with bitrate 250000 and dbitrate 1000000
 [INFO] Bringing down can0 can1
 [INFO] Bringing up can0 can1
 [INFO] Testing can1 as producer and can0 as consumer
 [INFO] Testing can0 as producer and can1 as consumer

EXIT|PASS|canfd_t_003.sh|[00:00:25] ||

bind/unbind
----------
[  566.821475] rcar_canfd 12440000.can: can_clk rate is 80000000
[  566.828076] rcar_canfd 12440000.can: device registered (channel 1)
[  566.834361] rcar_canfd 12440000.can: can_clk rate is 80000000
[  566.841842] rcar_canfd 12440000.can: device registered (channel 4)
[  566.848093] rcar_canfd 12440000.can: global operational state (canfd clk, fd mode)
 [INFO] Testing can0<->can1 with bitrate 1000000 and dbitrate 4000000
 [INFO] Bringing down can0 can1
 [INFO] Bringing up can0 can1
 [INFO] Testing can1 as producer and can0 as consumer
 [INFO] Testing can0 as producer and can1 as consumer
 [INFO] Testing can0<->can1 with bitrate 500000 and dbitrate 2000000
 [INFO] Bringing down can0 can1
 [INFO] Bringing up can0 can1
 [INFO] Testing can1 as producer and can0 as consumer
 [INFO] Testing can0 as producer and can1 as consumer
 [INFO] Testing can0<->can1 with bitrate 250000 and dbitrate 1000000
 [INFO] Bringing down can0 can1
 [INFO] Bringing up can0 can1
 [INFO] Testing can1 as producer and can0 as consumer
 [INFO] Testing can0 as producer and can1 as consumer

EXIT|PASS|canfd_t_003.sh|[00:00:25] ||

s2idle
-----
[  592.182479] PM: suspend entry (s2idle)
[  592.187031] Filesystems sync: 0.000 seconds
[  592.193221] Freezing user space processes
[  592.199425] Freezing user space processes completed (elapsed 0.002 seconds)
[  592.206450] OOM killer disabled.
[  592.209843] Freezing remaining freezable tasks
[  592.215775] Freezing remaining freezable tasks completed (elapsed 0.001 seconds)
[  592.223247] printk: Suspending console(s) (use no_console_suspend to debug)
[  592.260524] sd 0:0:0:0: [sda] Synchronizing SCSI cache
[  592.322759] renesas-gbeth 15c30000.ethernet end0: Link is Down
[  596.070955] dwmac4: Master AXI performs any burst length
[  596.072307] renesas-gbeth 15c30000.ethernet end0: No Safety Features support found
[  596.072376] renesas-gbeth 15c30000.ethernet end0: IEEE 1588-2008 Advanced Timestamp supported
[  596.077470] renesas-gbeth 15c30000.ethernet end0: configuring for phy/rgmii-id link mode
[  596.087503] dwmac4: Master AXI performs any burst length
[  596.088817] renesas-gbeth 15c40000.ethernet end1: No Safety Features support found
[  596.088881] renesas-gbeth 15c40000.ethernet end1: IEEE 1588-2008 Advanced Timestamp supported
[  596.093997] renesas-gbeth 15c40000.ethernet end1: configuring for phy/rgmii-id link mode
[  596.141986] usb usb1: root hub lost power or was reset
[  596.142031] usb usb2: root hub lost power or was reset
[  598.304525] usb 2-1: reset SuperSpeed Plus Gen 2x1 USB device number 2 using xhci-renesas-hcd
[  598.414846] OOM killer enabled.
[  598.418002] Restarting tasks: Starting
[  598.422518] Restarting tasks: Done
[  598.425999] random: crng reseeded on system resumption
[  598.431248] PM: suspend exit
[  598.661875] renesas-gbeth 15c30000.ethernet end0: Link is Up - 1Gbps/Full - flow control rx/tx
 [INFO] Testing can0<->can1 with bitrate 1000000 and dbitrate 4000000
 [INFO] Bringing down can0 can1
 [INFO] Bringing up can0 can1
 [INFO] Testing can1 as producer and can0 as consumer
 [INFO] Testing can0 as producer and can1 as consumer
 [INFO] Testing can0<->can1 with bitrate 500000 and dbitrate 2000000
 [INFO] Bringing down can0 can1
 [INFO] Bringing up can0 can1
 [INFO] Testing can1 as producer and can0 as consumer
 [INFO] Testing can0 as producer and can1 as consumer
 [INFO] Testing can0<->can1 with bitrate 250000 and dbitrate 1000000
 [INFO] Bringing down can0 can1
 [INFO] Bringing up can0 can1
 [INFO] Testing can1 as producer and can0 as consumer
 [INFO] Testing can0 as producer and can1 as consumer

EXIT|PASS|canfd_t_003.sh|[00:00:25] ||

Link: https://patch.msgid.link/20251124102837.106973-1-biju.das.jz@bp.renesas.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>