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What: /sys/bus/mhi/devices/mhi<N>_LOOPBACK/tre_size
Date: August 2026
KernelVersion: 7.4
Contact: mhi@lists.linux.dev
Description:
(RW) Size of each Transfer Ring Element (TRE) buffer in bytes
used for the loopback test. Valid range is 1 to the value
reported by max_tre_size. Default value is 32 bytes.
What: /sys/bus/mhi/devices/mhi<N>_LOOPBACK/max_tre_size
Date: August 2026
KernelVersion: 7.4
Contact: mhi@lists.linux.dev
Description:
(RO) Maximum allowed Transfer Ring Element (TRE) size in bytes.
Reading this file returns the upper bound for the tre_size
attribute.
What: /sys/bus/mhi/devices/mhi<N>_LOOPBACK/num_tre
Date: August 2026
KernelVersion: 7.4
Contact: mhi@lists.linux.dev
Description:
(RW) Number of Transfer Ring Elements (TREs) to use per
loopback test. Must be greater than zero and must not exceed
the value reported by max_num_tre. Default value is 1.
What: /sys/bus/mhi/devices/mhi<N>_LOOPBACK/max_num_tre
Date: August 2026
KernelVersion: 7.4
Contact: mhi@lists.linux.dev
Description:
(RO) Maximum number of Transfer Ring Elements (TREs) currently
available on the channel ring. Reading this file returns the
upper bound for the num_tre attribute.
What: /sys/bus/mhi/devices/mhi<N>_LOOPBACK/start
Date: August 2026
KernelVersion: 7.4
Contact: mhi@lists.linux.dev
Description:
(WO) Write any value to trigger a loopback test. The driver
sends random data to the endpoint using the configured tre_size
and num_tre parameters, waits for the endpoint to echo it back,
and verifies the received data matches what was sent.
This is a blocking write that returns when the test completes
or times out after 5 seconds. The write returns an error code
if the test fails or times out.
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