linux-kernel - [PATCH V4 1/3] scsi: ufs-qcom: Add support for dumping HW and SW hibern8 count

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Message-ID: <20250319063043.15236-2-quic_mapa@quicinc.com>
Date: Wed, 19 Mar 2025 12:00:41 +0530
From: Manish Pandey <quic_mapa@...cinc.com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        "James E.J.
 Bottomley" <James.Bottomley@...senPartnership.com>,
        "Martin K. Petersen"
	<martin.petersen@...cle.com>
CC: <linux-arm-msm@...r.kernel.org>, <linux-scsi@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <quic_nitirawa@...cinc.com>,
        <quic_cang@...cinc.com>, <quic_nguyenb@...cinc.com>
Subject: [PATCH V4 1/3] scsi: ufs-qcom: Add support for dumping HW and SW hibern8 count

Add support to dump HW and SW hibern8 enter and exit counts to
enhance the debugging of hibern8 state transitions.

Signed-off-by: Manish Pandey <quic_mapa@...cinc.com>
---
 drivers/ufs/host/ufs-qcom.c | 9 +++++++++
 drivers/ufs/host/ufs-qcom.h | 9 +++++++++
 2 files changed, 18 insertions(+)

diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index 23b9f6efa047..028833acb3db 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -1549,6 +1549,15 @@ static void ufs_qcom_dump_dbg_regs(struct ufs_hba *hba)
 
 	host = ufshcd_get_variant(hba);
 
+	dev_err(hba->dev, "HW_H8_ENTER_CNT=%d\n", ufshcd_readl(hba, REG_UFS_HW_H8_ENTER_CNT));
+	dev_err(hba->dev, "HW_H8_EXIT_CNT=%d\n", ufshcd_readl(hba, REG_UFS_HW_H8_EXIT_CNT));
+
+	dev_err(hba->dev, "SW_H8_ENTER_CNT=%d\n", ufshcd_readl(hba, REG_UFS_SW_H8_ENTER_CNT));
+	dev_err(hba->dev, "SW_H8_EXIT_CNT=%d\n", ufshcd_readl(hba, REG_UFS_SW_H8_EXIT_CNT));
+
+	dev_err(hba->dev, "SW_AFTER_HW_H8_ENTER_CNT=%d\n",
+			ufshcd_readl(hba, REG_UFS_SW_AFTER_HW_H8_ENTER_CNT));
+
 	ufshcd_dump_regs(hba, REG_UFS_SYS1CLK_1US, 16 * 4,
 			 "HCI Vendor Specific Registers ");
 
diff --git a/drivers/ufs/host/ufs-qcom.h b/drivers/ufs/host/ufs-qcom.h
index 919f53682beb..a5bf1282ddbe 100644
--- a/drivers/ufs/host/ufs-qcom.h
+++ b/drivers/ufs/host/ufs-qcom.h
@@ -72,6 +72,15 @@ enum {
 	UFS_UFS_DBG_RD_EDTL_RAM			= 0x1900,
 };
 
+/* QCOM UFS HC vendor specific Hibern8 count registers */
+enum {
+	REG_UFS_HW_H8_ENTER_CNT			= 0x2700,
+	REG_UFS_SW_H8_ENTER_CNT			= 0x2704,
+	REG_UFS_SW_AFTER_HW_H8_ENTER_CNT	= 0x2708,
+	REG_UFS_HW_H8_EXIT_CNT			= 0x270C,
+	REG_UFS_SW_H8_EXIT_CNT			= 0x2710,
+};
+
 enum {
 	UFS_MEM_CQIS_VS		= 0x8,
 };
-- 
2.17.1