linux-kernel - [PATCH v2] ufs: mcq: Adding a function for MCQ enable

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Message-Id: <20231221065608.9899-1-cw9316.lee@samsung.com>
Date: Thu, 21 Dec 2023 15:56:08 +0900
From: Chanwoo Lee <cw9316.lee@...sung.com>
To: alim.akhtar@...sung.com, avri.altman@....com, bvanassche@....org,
	jejb@...ux.ibm.com, martin.petersen@...cle.com, peter.wang@...iatek.com,
	chu.stanley@...il.com, matthias.bgg@...il.com,
	angelogioacchino.delregno@...labora.com, stanley.chu@...iatek.com,
	quic_cang@...cinc.com, mani@...nel.org, quic_asutoshd@...cinc.com,
	powen.kao@...iatek.com, quic_nguyenb@...cinc.com,
	yang.lee@...ux.alibaba.com, beanhuo@...ron.com, Arthur.Simchaev@....com,
	ebiggers@...gle.com, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org
Cc: grant.jung@...sung.com, jt77.jang@...sung.com, dh0421.hwang@...sung.com,
	sh043.lee@...sung.com, ChanWoo Lee <cw9316.lee@...sung.com>
Subject: [PATCH v2] ufs: mcq: Adding a function for MCQ enable

From: ChanWoo Lee <cw9316.lee@...sung.com>

The REG_UFS_MEM_CFG register is too general(broad)
and it is difficult to know the meaning only with a value of 0x1.
So far, comments were required.

Therefore, I have added new functions and defines
to improve code readability/reusability.

Signed-off-by: ChanWoo Lee <cw9316.lee@...sung.com>

* v1->v2:
   1) Excluding ESI_ENABLE
   2) Replace with ufshcd_rmwl, BIT()
   3) Separating hba->mcq_enabled
---
 drivers/ufs/core/ufs-mcq.c      | 6 ++++++
 drivers/ufs/core/ufshcd.c       | 4 +---
 drivers/ufs/host/ufs-mediatek.c | 4 +---
 include/ufs/ufshcd.h            | 1 +
 include/ufs/ufshci.h            | 3 +++
 5 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
index 0787456c2b89..edc752e55878 100644
--- a/drivers/ufs/core/ufs-mcq.c
+++ b/drivers/ufs/core/ufs-mcq.c
@@ -399,6 +399,12 @@ void ufshcd_mcq_enable_esi(struct ufs_hba *hba)
 }
 EXPORT_SYMBOL_GPL(ufshcd_mcq_enable_esi);
 
+void ufshcd_mcq_enable(struct ufs_hba *hba)
+{
+	ufshcd_rmwl(hba, MCQ_MODE_SELECT, MCQ_MODE_SELECT, REG_UFS_MEM_CFG);
+}
+EXPORT_SYMBOL_GPL(ufshcd_mcq_enable);
+
 void ufshcd_mcq_config_esi(struct ufs_hba *hba, struct msi_msg *msg)
 {
 	ufshcd_writel(hba, msg->address_lo, REG_UFS_ESILBA);
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index ae9936fc6ffb..30df6f6a72c6 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -8723,9 +8723,7 @@ static void ufshcd_config_mcq(struct ufs_hba *hba)
 	hba->host->can_queue = hba->nutrs - UFSHCD_NUM_RESERVED;
 	hba->reserved_slot = hba->nutrs - UFSHCD_NUM_RESERVED;
 
-	/* Select MCQ mode */
-	ufshcd_writel(hba, ufshcd_readl(hba, REG_UFS_MEM_CFG) | 0x1,
-		      REG_UFS_MEM_CFG);
+	ufshcd_mcq_enable(hba);
 	hba->mcq_enabled = true;
 
 	dev_info(hba->dev, "MCQ configured, nr_queues=%d, io_queues=%d, read_queue=%d, poll_queues=%d, queue_depth=%d\n",
diff --git a/drivers/ufs/host/ufs-mediatek.c b/drivers/ufs/host/ufs-mediatek.c
index fc61790d289b..1048add66419 100644
--- a/drivers/ufs/host/ufs-mediatek.c
+++ b/drivers/ufs/host/ufs-mediatek.c
@@ -1219,9 +1219,7 @@ static int ufs_mtk_link_set_hpm(struct ufs_hba *hba)
 		ufs_mtk_config_mcq(hba, false);
 		ufshcd_mcq_make_queues_operational(hba);
 		ufshcd_mcq_config_mac(hba, hba->nutrs);
-		/* Enable MCQ mode */
-		ufshcd_writel(hba, ufshcd_readl(hba, REG_UFS_MEM_CFG) | 0x1,
-			      REG_UFS_MEM_CFG);
+		ufshcd_mcq_enable(hba);
 	}
 
 	if (err)
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index d862c8ddce03..a96c45fa4b4b 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -1257,6 +1257,7 @@ unsigned long ufshcd_mcq_poll_cqe_lock(struct ufs_hba *hba,
 					 struct ufs_hw_queue *hwq);
 void ufshcd_mcq_make_queues_operational(struct ufs_hba *hba);
 void ufshcd_mcq_enable_esi(struct ufs_hba *hba);
+void ufshcd_mcq_enable(struct ufs_hba *hba);
 void ufshcd_mcq_config_esi(struct ufs_hba *hba, struct msi_msg *msg);
 
 int ufshcd_opp_config_clks(struct device *dev, struct opp_table *opp_table,
diff --git a/include/ufs/ufshci.h b/include/ufs/ufshci.h
index d5accacae6bc..2a6989a70671 100644
--- a/include/ufs/ufshci.h
+++ b/include/ufs/ufshci.h
@@ -282,6 +282,9 @@ enum {
 /* UTMRLRSR - UTP Task Management Request Run-Stop Register 80h */
 #define UTP_TASK_REQ_LIST_RUN_STOP_BIT		0x1
 
+/* REG_UFS_MEM_CFG - Global Config Registers 300h */
+#define MCQ_MODE_SELECT 	BIT(0)
+
 /* CQISy - CQ y Interrupt Status Register  */
 #define UFSHCD_MCQ_CQIS_TAIL_ENT_PUSH_STS	0x1
 
-- 
2.29.0