8c3166e17c
For ECs that support it, the EC returns the number of slp_s0 transitions and whether or not there was a timeout in the resume response. Expose the last resume result to usermode via debugfs so that usermode can detect and report S0ix timeouts. Signed-off-by: Evan Green <evgreen@chromium.org> Acked-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
57 lines
2.1 KiB
Plaintext
57 lines
2.1 KiB
Plaintext
What: /sys/kernel/debug/<cros-ec-device>/console_log
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Date: September 2017
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KernelVersion: 4.13
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Description:
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If the EC supports the CONSOLE_READ command type, this file
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can be used to grab the EC logs. The kernel polls for the log
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and keeps its own buffer but userspace should grab this and
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write it out to some logs.
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What: /sys/kernel/debug/<cros-ec-device>/panicinfo
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Date: September 2017
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KernelVersion: 4.13
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Description:
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This file dumps the EC panic information from the previous
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reboot. This file will only exist if the PANIC_INFO command
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type is supported by the EC.
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What: /sys/kernel/debug/<cros-ec-device>/pdinfo
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Date: June 2018
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KernelVersion: 4.17
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Description:
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This file provides the port role, muxes and power debug
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information for all the USB PD/type-C ports available. If
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the are no ports available, this file will be just an empty
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file.
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What: /sys/kernel/debug/<cros-ec-device>/uptime
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Date: June 2019
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KernelVersion: 5.3
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Description:
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A u32 providing the time since EC booted in ms. This is
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is used for synchronizing the AP host time with the EC
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log. An error is returned if the command is not supported
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by the EC or there is a communication problem.
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What: /sys/kernel/debug/<cros-ec-device>/last_resume_result
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Date: June 2019
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KernelVersion: 5.3
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Description:
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Some ECs have a feature where they will track transitions to
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the (Intel) processor's SLP_S0 line, in order to detect cases
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where a system failed to go into S0ix. When the system resumes,
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an EC with this feature will return a summary of SLP_S0
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transitions that occurred. The last_resume_result file returns
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the most recent response from the AP's resume message to the EC.
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The bottom 31 bits contain a count of the number of SLP_S0
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transitions that occurred since the suspend message was
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received. Bit 31 is set if the EC attempted to wake the
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system due to a timeout when watching for SLP_S0 transitions.
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Callers can use this to detect a wake from the EC due to
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S0ix timeouts. The result will be zero if no suspend
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transitions have been attempted, or the EC does not support
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this feature.
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Output will be in the format: "0x%08x\n".
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