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firmware: arm_scmi: Add SCMI v3.1 System Power extensions

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Add support for SCMIv3.1 System Power optional timeout field while
dispatching SYSTEM_POWER_STATE_NOTIFIER notification.

Link: https://lore.kernel.org/r/20220704101933.2981635-3-cristian.marussi@arm.com
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Cristian Marussi 2022-07-04 11:19:31 +01:00 committed by Sudeep Holla
parent a0db3962fb
commit 7097f29819
2 changed files with 18 additions and 1 deletions
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17
drivers/firmware/arm_scmi/system.c
View File

@ -27,10 +27,12 @@ struct scmi_system_power_state_notifier_payld {
__le32 agent_id;
__le32 flags;
__le32 system_state;
__le32 timeout;
};
struct scmi_system_info {
u32 version;
bool graceful_timeout_supported;
};
static int scmi_system_request_notify(const struct scmi_protocol_handle *ph,
@ -72,17 +74,27 @@ scmi_system_fill_custom_report(const struct scmi_protocol_handle *ph,
const void *payld, size_t payld_sz,
void *report, u32 *src_id)
{
size_t expected_sz;
const struct scmi_system_power_state_notifier_payld *p = payld;
struct scmi_system_power_state_notifier_report *r = report;
struct scmi_system_info *pinfo = ph->get_priv(ph);
expected_sz = pinfo->graceful_timeout_supported ?
sizeof(*p) : sizeof(*p) - sizeof(__le32);
if (evt_id != SCMI_EVENT_SYSTEM_POWER_STATE_NOTIFIER ||
sizeof(*p) != payld_sz)
payld_sz != expected_sz)
return NULL;
r->timestamp = timestamp;
r->agent_id = le32_to_cpu(p->agent_id);
r->flags = le32_to_cpu(p->flags);
r->system_state = le32_to_cpu(p->system_state);
if (pinfo->graceful_timeout_supported &&
r->system_state == SCMI_SYSTEM_SHUTDOWN &&
SCMI_SYSPOWER_IS_REQUEST_GRACEFUL(r->flags))
r->timeout = le32_to_cpu(p->timeout);
else
r->timeout = 0x00;
*src_id = 0;
return r;
@ -129,6 +141,9 @@ static int scmi_system_protocol_init(const struct scmi_protocol_handle *ph)
return -ENOMEM;
pinfo->version = version;
if (PROTOCOL_REV_MAJOR(pinfo->version) >= 0x2)
pinfo->graceful_timeout_supported = true;
return ph->set_priv(ph, pinfo);
}

2
include/linux/scmi_protocol.h
View File

@ -781,8 +781,10 @@ struct scmi_clock_rate_notif_report {
struct scmi_system_power_state_notifier_report {
ktime_t timestamp;
unsigned int agent_id;
#define SCMI_SYSPOWER_IS_REQUEST_GRACEFUL(flags) ((flags) & BIT(0))
unsigned int flags;
unsigned int system_state;
unsigned int timeout;
};
struct scmi_perf_limits_report {