linux-kernel - [PATCH] phy: qcom: qmp: Add debug prints for register writes

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Message-Id: <20240730100351.51454-1-manivannan.sadhasivam@linaro.org>
Date: Tue, 30 Jul 2024 15:33:51 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: vkoul@...nel.org
Cc: kishon@...nel.org,
	linux-arm-msm@...r.kernel.org,
	linux-phy@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: [PATCH] phy: qcom: qmp: Add debug prints for register writes

These register prints are useful to validate the init sequence against the
Qcom internal documentation and also to share with the Qcom hw engineers to
debug issues related to PHY.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---
 drivers/phy/qualcomm/phy-qcom-qmp-common.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-common.h b/drivers/phy/qualcomm/phy-qcom-qmp-common.h
index 799384210509..e6a6bcfcac28 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp-common.h
+++ b/drivers/phy/qualcomm/phy-qcom-qmp-common.h
@@ -9,6 +9,7 @@
 struct qmp_phy_init_tbl {
 	unsigned int offset;
 	unsigned int val;
+	char *name;
 	/*
 	 * mask of lanes for which this register is written
 	 * for cases when second lane needs different values
@@ -20,6 +21,7 @@ struct qmp_phy_init_tbl {
 	{				\
 		.offset = o,		\
 		.val = v,		\
+		.name = #o,		\
 		.lane_mask = 0xff,	\
 	}
 
@@ -27,6 +29,7 @@ struct qmp_phy_init_tbl {
 	{				\
 		.offset = o,		\
 		.val = v,		\
+		.name = #o,		\
 		.lane_mask = l,		\
 	}
 
@@ -45,6 +48,7 @@ static inline void qmp_configure_lane(void __iomem *base,
 		if (!(t->lane_mask & lane_mask))
 			continue;
 
+		pr_debug("QMP PHY: Writing: %s --> 0x%02x\n", t->name, t->val);
 		writel(t->val, base + t->offset);
 	}
 }
-- 
2.25.1