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Differential D59297

ufshci: fix the Snapdragon X Elite reference clock
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Authored by jaeyoon on Sep 1 2026, 6:07 AM.
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rG8dcd02bdf8a6: ufshci: fix the Snapdragon X Elite reference clock
rG973783515e7d: ufshci: fix the Snapdragon X Elite reference clock
Summary

The driver's ACPI table set bRefClkFreq to 19.2 MHz. The
Snapdragon X Elite feeds the device 38.4 MHz from its CXO. The
firmware has no property for it. The device ran its PLL from
the wrong base. Every HS mode failed. PWM still worked. The
attribute is persistent. The wrong value survived reboots.

Set 38.4 MHz in the table. Read the attribute first. Write it
only when the value differs or the read fails. Log a changed
value and a failed read. Verified on the Galaxy Book 4 Edge.

Sponsored by: Samsung Electronics

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rG FreeBSD src repository
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sys/
dev/
ufshci/
6 lines
17 lines

Diff 185606

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sys/dev/ufshci/ufshci_acpi.c

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sys/dev/ufshci/ufshci_dev.c

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