6.18-stable review patch. If anyone has any objections, please let me know.
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From: Thomas Richard (TI.com) thomas.richard@bootlin.com
[ Upstream commit 999e9bc953e321651d69556fdd5dfd178f96f128 ]
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: ec24643bdd62 ("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@boot... Signed-off-by: Nishanth Menon nm@ti.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/firmware/ti_sci.c | 21 +++++++++++++-------- drivers/firmware/ti_sci.h | 2 ++ 2 files changed, 15 insertions(+), 8 deletions(-)
diff --git a/drivers/firmware/ti_sci.c b/drivers/firmware/ti_sci.c index 49fd2ae01055d..8d96a3c12b36a 100644 --- a/drivers/firmware/ti_sci.c +++ b/drivers/firmware/ti_sci.c @@ -3751,9 +3751,11 @@ static int __maybe_unused 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 __maybe_unused 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 */ @@ -3928,11 +3932,12 @@ 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); diff --git a/drivers/firmware/ti_sci.h b/drivers/firmware/ti_sci.h index 701c416b2e78f..7559cde17b6cc 100644 --- a/drivers/firmware/ti_sci.h +++ b/drivers/firmware/ti_sci.h @@ -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;