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firmware: ti_sci: Add support for restoring clock context during resume

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Some DM-Firmware are not able to restore the clock rates and the
clock parents after a suspend-resume. The CLK_CONTEXT_LOST firmware
capability has been introduced to identify this characteristic.
In this case the responsibility is therefore delegated to the
ti_sci driver, which uses clk_restore_context() to trigger the
context_restore() operation for all registered clocks, including
those managed by the sci-clk. The sci-clk driver implements the
context_restore() operation to ensure rates and clock parents are
correctly restored.

Reviewed-by: Dhruva Gole <d-gole@ti.com>
Reviewed-by: Kendall Willis <k-willis@ti.com>
Signed-off-by: Thomas Richard (TI) <thomas.richard@bootlin.com>
Link: https://patch.msgid.link/20260519-ti-sci-jacinto-s2r-restore-irq-v9-4-c550a8ae0f31@bootlin.com
Signed-off-by: Nishanth Menon <nm@ti.com>
This commit is contained in:
Thomas Richard (TI) 2026-05-19 17:06:59 +02:00 committed by Nishanth Menon
parent 3c59123733
commit dc51f820bd
2 changed files with 10 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/firmware/ti_sci.c
View File

@ -9,6 +9,7 @@
#define pr_fmt(fmt) "%s: " fmt, __func__
#include <linux/bitmap.h>
#include <linux/clk.h>
#include <linux/cpu.h>
#include <linux/debugfs.h>
#include <linux/export.h>
@ -4010,6 +4011,9 @@ static int ti_sci_resume_noirq(struct device *dev)
}
}
}
if (info->fw_caps & MSG_FLAG_CAPS_LPM_CLK_CONTEXT_LOST)
clk_restore_context();
break;
default:
break;
@ -4170,14 +4174,15 @@ static int ti_sci_probe(struct platform_device *pdev)
}
ti_sci_msg_cmd_query_fw_caps(&info->handle, &info->fw_caps);
dev_dbg(dev, "Detected firmware capabilities: %s%s%s%s%s%s%s\n",
dev_dbg(dev, "Detected firmware capabilities: %s%s%s%s%s%s%s%s\n",
info->fw_caps & MSG_FLAG_CAPS_GENERIC ? "Generic" : "",
info->fw_caps & MSG_FLAG_CAPS_LPM_PARTIAL_IO ? " Partial-IO" : "",
info->fw_caps & MSG_FLAG_CAPS_LPM_DM_MANAGED ? " DM-Managed" : "",
info->fw_caps & MSG_FLAG_CAPS_LPM_ABORT ? " LPM-Abort" : "",
info->fw_caps & MSG_FLAG_CAPS_IO_ISOLATION ? " IO-Isolation" : "",
info->fw_caps & MSG_FLAG_CAPS_LPM_BOARDCFG_MANAGED ? " BoardConfig-Managed" : "",
info->fw_caps & MSG_FLAG_CAPS_LPM_IRQ_CONTEXT_LOST ? " IRQ-Context-Lost" : ""
info->fw_caps & MSG_FLAG_CAPS_LPM_IRQ_CONTEXT_LOST ? " IRQ-Context-Lost" : "",
info->fw_caps & MSG_FLAG_CAPS_LPM_CLK_CONTEXT_LOST ? " Clk-Context-Lost" : ""
);
ti_sci_setup_ops(info);

3
drivers/firmware/ti_sci.h
View File

@ -154,6 +154,8 @@ struct ti_sci_msg_req_reboot {
* for the DM via boardcfg
* MSG_FLAG_CAPS_LPM_IRQ_CONTEXT_LOST: DM is not able to restore IRQ
* context
* MSG_FLAG_CAPS_LPM_CLK_CONTEXT_LOST: DM is not able to restore
* Clock context
*
* Response to a generic message with message type TI_SCI_MSG_QUERY_FW_CAPS
* providing currently available SOC/firmware capabilities. SoC that don't
@ -168,6 +170,7 @@ struct ti_sci_msg_resp_query_fw_caps {
#define MSG_FLAG_CAPS_IO_ISOLATION TI_SCI_MSG_FLAG(7)
#define MSG_FLAG_CAPS_LPM_BOARDCFG_MANAGED TI_SCI_MSG_FLAG(12)
#define MSG_FLAG_CAPS_LPM_IRQ_CONTEXT_LOST TI_SCI_MSG_FLAG(14)
#define MSG_FLAG_CAPS_LPM_CLK_CONTEXT_LOST TI_SCI_MSG_FLAG(15)
#define MSG_MASK_CAPS_LPM GENMASK_ULL(4, 1)
u64 fw_caps;
} __packed;