Re: [PATCH] firmware/psci: add support for SYSTEM_RESET2

From: Florian Fainelli
Date: Tue May 01 2018 - 13:59:23 EST


On 05/01/2018 07:51 AM, Sudeep Holla wrote:
> PSCI v1.1 introduced SYSTEM_RESET2 to allow both architectural resets
> where the semantics are described by the PSCI specification itself as
> well as vendor-specific resets. Currently only system warm reset
> semantics is defined as part of architectural resets by the specification.
>
> This patch implements support for SYSTEM_RESET2 by making using of
> reboot_mode passed by the reboot infrastructure in the kernel.
>
> Cc: Mark Rutland <mark.rutland@xxxxxxx>
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
> Signed-off-by: Sudeep Holla <sudeep.holla@xxxxxxx>
> ---
> drivers/firmware/psci.c | 21 +++++++++++++++++++++
> include/uapi/linux/psci.h | 2 ++
> 2 files changed, 23 insertions(+)
>
> diff --git a/drivers/firmware/psci.c b/drivers/firmware/psci.c
> index c80ec1d03274..216b1950bbd5 100644
> --- a/drivers/firmware/psci.c
> +++ b/drivers/firmware/psci.c
> @@ -88,6 +88,7 @@ static u32 psci_function_id[PSCI_FN_MAX];
> PSCI_1_0_EXT_POWER_STATE_TYPE_MASK)
>
> static u32 psci_cpu_suspend_feature;
> +bool psci_system_reset2_supported;

Should this be static? It does not appear to be used in another
translation unit.

>
> static inline bool psci_has_ext_power_state(void)
> {
> @@ -253,6 +254,15 @@ static int get_set_conduit_method(struct device_node *np)
>
> static void psci_sys_reset(enum reboot_mode reboot_mode, const char *cmd)
> {
> + if ((reboot_mode == REBOOT_WARM || reboot_mode == REBOOT_SOFT) &&
> + psci_system_reset2_supported)
> + /*
> + * reset_type[31] = 0 (architectural)
> + * reset_type[30:0] = 0 (SYSTEM_WARM_RESET)
> + * cookie = 0 (ignored by the implementation

Missing closing parenthesis

> + */
> + invoke_psci_fn(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2), 0, 0, 0);

--
Florian