From: Dave Gerlach <d-gerlach@xxxxxx>
Introduce a ti_sci_prepare_system_suspend call to be used in the driver
suspend handler to allow the system to identify the low power mode being
entered and if necessary, send TISCI_MSG_PREPARE_SLEEP with information
about the mode is being entered and the address for allocated memory for
storing the context during Deep Sleep.
We're using "pm_suspend_target_state" to map the kernel's target suspend
state to SysFW low power mode. Make sure this is available only when
CONFIG_SUSPEND is enabled.
Signed-off-by: Dave Gerlach <d-gerlach@xxxxxx>
Signed-off-by: Vibhore Vardhan <vibhore@xxxxxx>
Signed-off-by: Georgi Vlaev <g-vlaev@xxxxxx>
Tested-by: Roger Quadros <rogerq@xxxxxxxxxx>
---
drivers/firmware/ti_sci.c | 37 +++++++++++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)
diff --git a/drivers/firmware/ti_sci.c b/drivers/firmware/ti_sci.c
index 09bca1a15d74..681f2ebb3fe4 100644
--- a/drivers/firmware/ti_sci.c
+++ b/drivers/firmware/ti_sci.c
@@ -3568,9 +3568,46 @@ static void ti_sci_set_is_suspending(struct ti_sci_info *info, bool is_suspendin
info->is_suspending = is_suspending;
}
+static int ti_sci_prepare_system_suspend(struct ti_sci_info *info)
+{
+#if IS_ENABLED(CONFIG_SUSPEND)
+ u8 mode;
+
+ /* Map and validate the target Linux suspend state to TISCI LPM. */
+ switch (pm_suspend_target_state) {
+ case PM_SUSPEND_MEM:
+ /* S2MEM is not supported by the firmware. */
+ if (!(info->fw_caps & MSG_FLAG_CAPS_LPM_DEEP_SLEEP))
+ return 0;
+ /* S2MEM can't continue if the LPM firmware is not loaded. */
+ if (!info->lpm_firmware_loaded)
+ return -EINVAL;
+ mode = TISCI_MSG_VALUE_SLEEP_MODE_DEEP_SLEEP;
+ break;
+ default:
+ /*
+ * Do not fail if we don't have action to take for a
+ * specific suspend mode.
+ */
+ return 0;
+ }
+
+ return ti_sci_cmd_prepare_sleep(&info->handle, mode,
+ (u32)(info->ctx_mem_addr & 0xffffffff),
+ (u32)((u64)info->ctx_mem_addr >> 32), 0);
+#else
+ return 0;
+#endif
+}
+
static int ti_sci_suspend(struct device *dev)
{
struct ti_sci_info *info = dev_get_drvdata(dev);
+ int ret;
+
+ ret = ti_sci_prepare_system_suspend(info);
+ if (ret)
+ return ret;
/*
* We must switch operation to polled mode now as drivers and the genpd
* layer may make late TI SCI calls to change clock and device states
--
2.30.2
