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* [PATCH v2] ufs: core: support UFSHCI 4.1 CQ entry tag
@ 2026-02-10  7:17 peter.wang
  2026-02-10 10:10 ` Bean Huo
                   ` (3 more replies)
  0 siblings, 4 replies; 6+ messages in thread
From: peter.wang @ 2026-02-10  7:17 UTC (permalink / raw)
  To: linux-scsi, martin.petersen, avri.altman, alim.akhtar, jejb
  Cc: wsd_upstream, linux-mediatek, peter.wang, chun-hung.wu,
	alice.chao, cc.chou, chaotian.jing, tun-yu.yu, eddie.huang,
	naomi.chu, ed.tsai, bvanassche

From: Peter Wang <peter.wang@mediatek.com>

The UFSHCI 4.1 specification introduces a new completion queue(CQ)
entry format, allowing the tag to be obtained directly.

Signed-off-by: Peter Wang <peter.wang@mediatek.com>
---
 drivers/ufs/core/ufs-mcq.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
index ad0ada57959a..a4d0f8834314 100644
--- a/drivers/ufs/core/ufs-mcq.c
+++ b/drivers/ufs/core/ufs-mcq.c
@@ -273,13 +273,18 @@ void ufshcd_mcq_write_cqis(struct ufs_hba *hba, u32 val, int i)
 EXPORT_SYMBOL_GPL(ufshcd_mcq_write_cqis);
 
 /*
- * Current MCQ specification doesn't provide a Task Tag or its equivalent in
+ * UFSHCI 4.0 MCQ specification doesn't provide a Task Tag or its equivalent in
  * the Completion Queue Entry. Find the Task Tag using an indirect method.
+ * UFSHCI 4.1 and above can directly return the Task Tag in the Completion Queue
+ * Entry.
  */
 static int ufshcd_mcq_get_tag(struct ufs_hba *hba, struct cq_entry *cqe)
 {
 	u64 addr;
 
+	if (hba->ufs_version >= ufshci_version(4, 1))
+		return cqe->task_tag;
+
 	/* sizeof(struct utp_transfer_cmd_desc) must be a multiple of 128 */
 	BUILD_BUG_ON(sizeof(struct utp_transfer_cmd_desc) & GENMASK(6, 0));
 
-- 
2.45.2


^ permalink raw reply related	[flat|nested] 6+ messages in thread
end of thread, other threads:[~2026-03-01  2:16 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2026-02-10  7:17 [PATCH v2] ufs: core: support UFSHCI 4.1 CQ entry tag peter.wang
2026-02-10 10:10 ` Bean Huo
2026-02-10 18:41 ` Bart Van Assche
2026-02-24 18:42 ` Martin K. Petersen
2026-02-28 22:22 ` Martin K. Petersen
2026-03-01  2:16   ` Martin K. Petersen

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