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    SubjectRe: [PATCH v1 1/1] ufs: core: Add host quirk QUIRK_MCQ_EXPAND_QUEUE_SLOT
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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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