Messages in this thread Patch in this message | | | From | Dhruva Gole <> | Subject | [PATCH V6 4/4] firmware: ti_sci: Introduce system suspend resume support | Date | Thu, 3 Aug 2023 12:12:47 +0530 |
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Introduce system suspend resume calls that will allow the ti_sci driver to support deep sleep low power mode when the user space issues a suspend to mem.
Also, write 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.
Co-developed-by: Dave Gerlach <d-gerlach@ti.com> Signed-off-by: Dave Gerlach <d-gerlach@ti.com> Signed-off-by: Vibhore Vardhan <vibhore@ti.com> Signed-off-by: Georgi Vlaev <g-vlaev@ti.com> Signed-off-by: Dhruva Gole <d-gole@ti.com> --- drivers/firmware/ti_sci.c | 63 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 63 insertions(+)
diff --git a/drivers/firmware/ti_sci.c b/drivers/firmware/ti_sci.c index 0334ade19868..172b726e00a6 100644 --- a/drivers/firmware/ti_sci.c +++ b/drivers/firmware/ti_sci.c @@ -22,6 +22,7 @@ #include <linux/slab.h> #include <linux/soc/ti/ti-msgmgr.h> #include <linux/soc/ti/ti_sci_protocol.h> +#include <linux/suspend.h> #include <linux/reboot.h> #include "ti_sci.h" @@ -3521,6 +3522,67 @@ static int tisci_reboot_handler(struct notifier_block *nb, unsigned long mode, return NOTIFY_BAD; } +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; + 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_cmd_set_io_isolation(&info->handle, TISCI_MSG_VALUE_IO_ENABLE); + if (ret) + return ret; + dev_dbg(dev, "%s: set I/O isolation: %d\n", __func__, ret); + + ret = ti_sci_prepare_system_suspend(info); + if (ret) + return ret; + + return 0; +} + +static int ti_sci_resume(struct device *dev) +{ + struct ti_sci_info *info = dev_get_drvdata(dev); + int ret; + + ret = ti_sci_cmd_set_io_isolation(&info->handle, TISCI_MSG_VALUE_IO_DISABLE); + if (ret) + return ret; + dev_dbg(dev, "%s: disable I/O isolation: %d\n", __func__, ret); + + return 0; +} + +static DEFINE_SIMPLE_DEV_PM_OPS(ti_sci_pm_ops, ti_sci_suspend, ti_sci_resume); + static int ti_sci_init_suspend(struct platform_device *pdev, struct ti_sci_info *info) { @@ -3759,6 +3821,7 @@ static struct platform_driver ti_sci_driver = { .driver = { .name = "ti-sci", .of_match_table = of_match_ptr(ti_sci_of_match), + .pm = &ti_sci_pm_ops, }, }; module_platform_driver(ti_sci_driver); -- 2.34.1
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