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scsi: ufs: core: Expand MCQ queue slot to DeviceQueueDepth + 1
The UFSHCI 4.0 specification mandates that there should always be at least
one empty slot in each queue for distinguishing between full and empty
states. Enlarge 'hwq->max_entries' to 'DeviceQueueDepth + 1' to allow
UFSHCI 4.0 controllers to fully utilize MCQ queue slots.
Fixes: 4682abfae2
("scsi: ufs: core: mcq: Allocate memory for MCQ mode")
Signed-off-by: Naomi Chu <naomi.chu@mediatek.com>
Link: https://lore.kernel.org/r/20231102052426.12006-2-naomi.chu@mediatek.com
Reviewed-by: Stanley Chu <stanley.chu@mediatek.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Peter Wang <peter.wang@mediatek.com>
Reviewed-by: Chun-Hung <chun-hung.wu@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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@ -436,7 +436,7 @@ int ufshcd_mcq_init(struct ufs_hba *hba)
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for (i = 0; i < hba->nr_hw_queues; i++) {
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hwq = &hba->uhq[i];
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hwq->max_entries = hba->nutrs;
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hwq->max_entries = hba->nutrs + 1;
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spin_lock_init(&hwq->sq_lock);
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spin_lock_init(&hwq->cq_lock);
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mutex_init(&hwq->sq_mutex);
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