For J7200, J784s4, J721e, j722s, j721s2 SoCs, the everything is shutdown at suspend but the PMIC and the DDR. In order for U-Boot SPL to know that it is resuming from suspend and not booting, a flag is set in a PMIC register. So, at startup, U-Boot will read the PMIC register and deduce if the board is resuming from suspend or not.
This state (resuming or not) is consulted at several places (in board_init_f() and in k3_ddrss_probe(). As it takes some time to read a i2c register, it's best to cache the information. But, as stated by the README, in board_init_f(), the BSS is not available, so we cannot use global/static variables, only stack variables and global_data. Thus, we use gd to store the resume state of the board. Signed-off-by: Richard Genoud (TI) <[email protected]> --- arch/arm/include/asm/global_data.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/arch/arm/include/asm/global_data.h b/arch/arm/include/asm/global_data.h index b2ec450f9002..a146206fdff9 100644 --- a/arch/arm/include/asm/global_data.h +++ b/arch/arm/include/asm/global_data.h @@ -14,6 +14,14 @@ #include <linux/types.h> #include <asm/u-boot.h> +#if IS_ENABLED(CONFIG_ARCH_K3) +enum k3_resume_state { + K3_RESUME_STATE_UNKNOWN = 0, + K3_RESUME_STATE_BOOTING, + K3_RESUME_STATE_RESUMING +}; +#endif + /* Architecture-specific global data */ struct arch_global_data { #if defined(CONFIG_FSL_ESDHC) || defined(CONFIG_FSL_ESDHC_IMX) @@ -108,8 +116,19 @@ struct arch_global_data { #ifdef CONFIG_SMBIOS ulong smbios_start; /* Start address of SMBIOS table */ #endif +#if (IS_ENABLED(CONFIG_SPL_BUILD) && IS_ENABLED(CONFIG_ARCH_K3)) + enum k3_resume_state k3_resuming; +#endif }; +#if (IS_ENABLED(CONFIG_SPL_BUILD) && IS_ENABLED(CONFIG_ARCH_K3)) +#define gd_k3_resuming() gd->arch.k3_resuming +#define gd_set_k3_resuming(state) gd->arch.k3_resuming = (state) +#else +#define gd_k3_resuming() 0 +#define gd_set_k3_resuming(state) +#endif + #include <asm-generic/global_data.h> #if defined(__clang__) || defined(LTO_ENABLE) -- 2.47.3
