diff options
| author | Jakob Unterwurzacher <jakob.unterwurzacher@cherry.de> | 2025-06-16 15:54:41 +0200 |
|---|---|---|
| committer | Jakob Unterwurzacher <jakob.unterwurzacher@cherry.de> | 2025-06-17 15:19:29 +0200 |
| commit | f124b9112cca09f311364f10669c7fe0fc83900d (patch) | |
| tree | 7b402f5b91159a4e04e0f10e0b09e2defacffd00 | |
| parent | da88faf87013cf5e586d75e45cae14e5d20b2c69 (diff) | |
FROMLIST: board: rockchip: unblock CAN bus in spl_board_init on JaguarHEADv2024.07-puma
GPIO0_B7 is routed to TXI of the on-board CAN transceiver. The
line has a pull-down per SoC default.
This means the CAN transceiver transmits a dominant zero
and blocks the CAN bus until Linux boots and reconfigures the pin.
Let's switch to pull-up as soon as we can (i.e. in SPL).
This cuts down the "bus is blocked" time from 10 seconds to < 1 second.
Of course, to this needs CONFIG_SPL_BOARD_INIT, so enable it
the Jaguar defconfig.
Signed-off-by: Jakob Unterwurzacher <jakob.unterwurzacher@cherry.de>
Link: https://lore.kernel.org/u-boot/20250617084253.1756035-1-jakob.unterwurzacher@cherry.de/
Relates-to: JAG-403
Signed-off-by: Jakob Unterwurzacher <jakob.unterwurzacher@cherry.de>
| -rw-r--r-- | board/theobroma-systems/jaguar_rk3588/jaguar_rk3588.c | 19 | ||||
| -rw-r--r-- | configs/jaguar-rk3588_defconfig | 1 |
2 files changed, 20 insertions, 0 deletions
diff --git a/board/theobroma-systems/jaguar_rk3588/jaguar_rk3588.c b/board/theobroma-systems/jaguar_rk3588/jaguar_rk3588.c index a6d44f10db3..3f484646701 100644 --- a/board/theobroma-systems/jaguar_rk3588/jaguar_rk3588.c +++ b/board/theobroma-systems/jaguar_rk3588/jaguar_rk3588.c @@ -51,3 +51,22 @@ int rockchip_early_misc_init_r(void) return 0; } + +#define GPIO0B7_PU_EN BIT(15) + +void spl_board_init(void) +{ + /* + * GPIO0_B7 is routed to CAN TX. This SoC pin has a pull-down per default. + * So on power-up, we block the CAN bus with a dominant zero. We want to keep + * this blocking time to a minimum, so we want to get this pin high in SPL. + * + * The CAN driver in Linux disables the pull-down and sets the pin to + * output high. We don't have a CAN driver in U-Boot and don't need one, + * so we just use the easiest way to get the pin high, which is setting a + * pull-up. + */ + struct rk3588_pmu2_ioc * const ioc = (void *)PMU2_IOC_BASE; + + rk_setreg(&ioc->gpio0b_p, GPIO0B7_PU_EN); +} diff --git a/configs/jaguar-rk3588_defconfig b/configs/jaguar-rk3588_defconfig index 18006467dde..3d0c017c0c6 100644 --- a/configs/jaguar-rk3588_defconfig +++ b/configs/jaguar-rk3588_defconfig @@ -27,6 +27,7 @@ CONFIG_DISPLAY_BOARDINFO_LATE=y CONFIG_CYCLIC=y CONFIG_SPL_MAX_SIZE=0x40000 CONFIG_SPL_PAD_TO=0x7f8000 +CONFIG_SPL_BOARD_INIT=y # CONFIG_SPL_RAW_IMAGE_SUPPORT is not set CONFIG_SPL_ATF=y # CONFIG_BOOTM_NETBSD is not set |