Messages in this thread | | | Date | Wed, 25 Oct 2023 11:10:59 -0700 | Subject | Re: [PATCH v1 1/1] ufs: core: Add host quirk QUIRK_MCQ_EXPAND_QUEUE_SLOT | From | Bart Van Assche <> |
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On 10/25/23 01:56, Chun-Hung Wu wrote: > This quirk needs to be enabled if the host controller cannot > distinguish queue full or empty.
From the UFSHCI 4.0 specification: "When the head and tail doorbells are equal, the queue is empty. [ ... ] When the head and tail doorbells are not equal, the queue contains queue entries."
How is it possible that a host controller cannot distinguish queue full or queue empty? Which (head - tail) values cause trouble? More information is needed.
Thanks,
Bart.
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