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firmware: ti_sci: Set IO Isolation only if the firmware is capable

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Prevent calling ti_sci_cmd_set_io_isolation() on firmware
that does not support the IO_ISOLATION capability. Add the
MSG_FLAG_CAPS_IO_ISOLATION capability flag and check it before
attempting to set IO isolation during suspend/resume operations.

Without this check, systems with older firmware may experience
undefined behavior or errors when entering/exiting suspend states.

Fixes: ec24643bdd ("firmware: ti_sci: Add system suspend and resume call")
Signed-off-by: Thomas Richard (TI.com) <thomas.richard@bootlin.com>
Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Link: https://patch.msgid.link/20251031-ti-sci-io-isolation-v2-1-60d826b65949@bootlin.com
Signed-off-by: Nishanth Menon <nm@ti.com>
This commit is contained in:
Thomas Richard (TI.com)
2025-10-31 13:44:56 +01:00
committed by Nishanth Menon
parent 7a4cd87e76
commit 999e9bc953
2 changed files with 15 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/firmware/ti_sci.c
View File

@@ -3751,9 +3751,11 @@ static int ti_sci_suspend_noirq(struct device *dev)
struct ti_sci_info *info = dev_get_drvdata(dev);
int ret = 0;
ret = ti_sci_cmd_set_io_isolation(&info->handle, TISCI_MSG_VALUE_IO_ENABLE);
if (ret)
return ret;
if (info->fw_caps & MSG_FLAG_CAPS_IO_ISOLATION) {
ret = ti_sci_cmd_set_io_isolation(&info->handle, TISCI_MSG_VALUE_IO_ENABLE);
if (ret)
return ret;
}
return 0;
}
@@ -3767,9 +3769,11 @@ static int ti_sci_resume_noirq(struct device *dev)
u8 pin;
u8 mode;
ret = ti_sci_cmd_set_io_isolation(&info->handle, TISCI_MSG_VALUE_IO_DISABLE);
if (ret)
return ret;
if (info->fw_caps & MSG_FLAG_CAPS_IO_ISOLATION) {
ret = ti_sci_cmd_set_io_isolation(&info->handle, TISCI_MSG_VALUE_IO_DISABLE);
if (ret)
return ret;
}
ret = ti_sci_msg_cmd_lpm_wake_reason(&info->handle, &source, &time, &pin, &mode);
/* Do not fail to resume on error as the wake reason is not critical */
@@ -3926,11 +3930,12 @@ 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\n",
dev_dbg(dev, "Detected firmware capabilities: %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_LPM_ABORT ? " LPM-Abort" : "",
info->fw_caps & MSG_FLAG_CAPS_IO_ISOLATION ? " IO-Isolation" : ""
);
ti_sci_setup_ops(info);

2
drivers/firmware/ti_sci.h
View File

@@ -149,6 +149,7 @@ struct ti_sci_msg_req_reboot {
* MSG_FLAG_CAPS_LPM_PARTIAL_IO: Partial IO in LPM
* MSG_FLAG_CAPS_LPM_DM_MANAGED: LPM can be managed by DM
* MSG_FLAG_CAPS_LPM_ABORT: Abort entry to LPM
* MSG_FLAG_CAPS_IO_ISOLATION: IO Isolation support
*
* Response to a generic message with message type TI_SCI_MSG_QUERY_FW_CAPS
* providing currently available SOC/firmware capabilities. SoC that don't
@@ -160,6 +161,7 @@ struct ti_sci_msg_resp_query_fw_caps {
#define MSG_FLAG_CAPS_LPM_PARTIAL_IO TI_SCI_MSG_FLAG(4)
#define MSG_FLAG_CAPS_LPM_DM_MANAGED TI_SCI_MSG_FLAG(5)
#define MSG_FLAG_CAPS_LPM_ABORT TI_SCI_MSG_FLAG(9)
#define MSG_FLAG_CAPS_IO_ISOLATION TI_SCI_MSG_FLAG(7)
#define MSG_MASK_CAPS_LPM GENMASK_ULL(4, 1)
u64 fw_caps;
} __packed;