linux-kernel - [PATCH v1] scsi: ufs: mcq: add 1 to the max Queues value

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Date:   Wed, 19 Apr 2023 18:48:38 +0900
From:   SEO HOYOUNG <hy50.seo@...sung.com>
To:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        alim.akhtar@...sung.com, avri.altman@....com, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, beanhuo@...ron.com, bvanassche@....org,
        bhoon95.kim@...sung.com, kwmad.kim@...sung.com, sc.suh@...sung.com,
        quic_nguyenb@...cinc.com
Cc:     SEO HOYOUNG <hy50.seo@...sung.com>
Subject: [PATCH v1] scsi: ufs: mcq: add 1 to the max Queues value

If read the MAXQ field value verbatim, can use a value
that is one less than the supported Queue.
So read the MAXQ field value and incremented it by one

below is the specification
Maximum number of Queues (MAXQ):
Maximum number of Queues this controller can support.
In this version of specification, maximum value is 31.

NOTE To support 1:1 topology, the Host HW controller must support
HW resources for MAXQ number of Completion Queues too.
Host SW may use less number of completion queues for N:1 topology..:1 Queue
0: 1 Queue
1: 2 Queues
…
31: 32 Queues
32-255 : reserved

Signed-off-by: SEO HOYOUNG <hy50.seo@...sung.com>
---
 drivers/ufs/core/ufs-mcq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
index 31df052fbc41..a1ee3318c605 100644
--- a/drivers/ufs/core/ufs-mcq.c
+++ b/drivers/ufs/core/ufs-mcq.c
@@ -150,7 +150,7 @@ static int ufshcd_mcq_config_nr_queues(struct ufs_hba *hba)
 	u32 hba_maxq, rem, tot_queues;
 	struct Scsi_Host *host = hba->host;

-	hba_maxq = FIELD_GET(MAX_QUEUE_SUP, hba->mcq_capabilities);
+	hba_maxq = FIELD_GET(MAX_QUEUE_SUP, hba->mcq_capabilities) + 1;

 	tot_queues = UFS_MCQ_NUM_DEV_CMD_QUEUES + read_queues + poll_queues +
 			rw_queues;
-- 
2.26.0