linux-kernel - [PATCH AUTOSEL 6.8 01/25] scsi: ufs: core: Fix MCQ MAC configuration

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Date: Sun,  7 Apr 2024 09:10:49 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Rohit Ner <rohitner@...gle.com>,
	Peter Wang <peter.wang@...iatek.com>,
	Can Guo <quic_cang@...cinc.com>,
	"Martin K . Petersen" <martin.petersen@...cle.com>,
	Sasha Levin <sashal@...nel.org>,
	jejb@...ux.ibm.com,
	matthias.bgg@...il.com,
	angelogioacchino.delregno@...labora.com,
	bvanassche@....org,
	stanley.chu@...iatek.com,
	quic_nguyenb@...cinc.com,
	powen.kao@...iatek.com,
	alice.chao@...iatek.com,
	yang.lee@...ux.alibaba.com,
	linux-scsi@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org
Subject: [PATCH AUTOSEL 6.8 01/25] scsi: ufs: core: Fix MCQ MAC configuration

From: Rohit Ner <rohitner@...gle.com>

[ Upstream commit 767712f91de76abd22a45184e6e3440120b8bfce ]

As per JEDEC Standard No. 223E Section 5.9.2, the max # active commands
value programmed by the host sw in MCQConfig.MAC should be one less than
the actual value.

Signed-off-by: Rohit Ner <rohitner@...gle.com>
Link: https://lore.kernel.org/r/20240220095637.2900067-1-rohitner@google.com
Reviewed-by: Peter Wang <peter.wang@...iatek.com>
Reviewed-by: Can Guo <quic_cang@...cinc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 0787456c2b892..c873fd8239427 100644
--- a/drivers/ufs/core/ufs-mcq.c
+++ b/drivers/ufs/core/ufs-mcq.c
@@ -94,7 +94,7 @@ void ufshcd_mcq_config_mac(struct ufs_hba *hba, u32 max_active_cmds)
 
 	val = ufshcd_readl(hba, REG_UFS_MCQ_CFG);
 	val &= ~MCQ_CFG_MAC_MASK;
-	val |= FIELD_PREP(MCQ_CFG_MAC_MASK, max_active_cmds);
+	val |= FIELD_PREP(MCQ_CFG_MAC_MASK, max_active_cmds - 1);
 	ufshcd_writel(hba, val, REG_UFS_MCQ_CFG);
 }
 EXPORT_SYMBOL_GPL(ufshcd_mcq_config_mac);
-- 
2.43.0