linux-kernel - [PATCH v2 2/5] scsi: ufs: ufs-mediatek: Provide detailed description for UIC errors

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Date:   Wed, 27 Jul 2022 11:44:51 +0800
From:   Stanley Chu <stanley.chu@...iatek.com>
To:     <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <martin.petersen@...cle.com>, <avri.altman@....com>,
        <alim.akhtar@...sung.com>, <jejb@...ux.ibm.com>,
        <bvanassche@....org>
CC:     <peter.wang@...iatek.com>, <chun-hung.wu@...iatek.com>,
        <alice.chao@...iatek.com>, <powen.kao@...iatek.com>,
        <mason.zhang@...iatek.com>, <qilin.tan@...iatek.com>,
        <lin.gui@...iatek.com>, <eddie.huang@...iatek.com>,
        <tun-yu.yu@...iatek.com>, <cc.chou@...iatek.com>,
        <chaotian.jing@...iatek.com>, <jiajie.hao@...iatek.com>,
        <stanley.chu@...iatek.com>
Subject: [PATCH v2 2/5] scsi: ufs: ufs-mediatek: Provide detailed description for UIC errors

Provide detailed description in logs for UIC errors for
eaiser issue breakdown.

Signed-off-by: Stanley Chu <stanley.chu@...iatek.com>
---
 drivers/ufs/host/ufs-mediatek.c | 20 +++++++++++++++++
 drivers/ufs/host/ufs-mediatek.h | 38 +++++++++++++++++++++++++++++++++
 2 files changed, 58 insertions(+)

diff --git a/drivers/ufs/host/ufs-mediatek.c b/drivers/ufs/host/ufs-mediatek.c
index ff6fd8f52ebc..b590fb267c20 100644
--- a/drivers/ufs/host/ufs-mediatek.c
+++ b/drivers/ufs/host/ufs-mediatek.c
@@ -1309,8 +1309,28 @@ static void ufs_mtk_event_notify(struct ufs_hba *hba,
 				 enum ufs_event_type evt, void *data)
 {
 	unsigned int val = *(u32 *)data;
+	unsigned long reg;
+	int bit;
 
 	trace_ufs_mtk_event(evt, val);
+
+	/* Print details of UIC Errors */
+	if (evt <= UFS_EVT_DME_ERR) {
+		dev_info(hba->dev,
+			 "Host UIC Error Code (%s): %08x\n",
+			 ufs_uic_err_str[evt], val);
+		reg = val;
+	}
+
+	if (evt == UFS_EVT_PA_ERR) {
+		for_each_set_bit(bit, &reg, ARRAY_SIZE(ufs_uic_pa_err_str))
+			dev_info(hba->dev, "%s\n", ufs_uic_pa_err_str[bit]);
+	}
+
+	if (evt == UFS_EVT_DL_ERR) {
+		for_each_set_bit(bit, &reg, ARRAY_SIZE(ufs_uic_dl_err_str))
+			dev_info(hba->dev, "%s\n", ufs_uic_dl_err_str[bit]);
+	}
 }
 
 /*
diff --git a/drivers/ufs/host/ufs-mediatek.h b/drivers/ufs/host/ufs-mediatek.h
index aa26d415527b..9017ab8f9867 100644
--- a/drivers/ufs/host/ufs-mediatek.h
+++ b/drivers/ufs/host/ufs-mediatek.h
@@ -26,6 +26,44 @@
 #define REG_UFS_DEBUG_SEL_B2        0x22D8
 #define REG_UFS_DEBUG_SEL_B3        0x22DC
 
+/*
+ * Details of UIC Errors
+ */
+static const u8 *ufs_uic_err_str[] = {
+	"PHY Adapter Layer",
+	"Data Link Layer",
+	"Network Link Layer",
+	"Transport Link Layer",
+	"DME"
+};
+
+static const u8 *ufs_uic_pa_err_str[] = {
+	"PHY error on Lane 0",
+	"PHY error on Lane 1",
+	"PHY error on Lane 2",
+	"PHY error on Lane 3",
+	"Generic PHY Adapter Error. This should be the LINERESET indication"
+};
+
+static const u8 *ufs_uic_dl_err_str[] = {
+	"NAC_RECEIVED",
+	"TCx_REPLAY_TIMER_EXPIRED",
+	"AFCx_REQUEST_TIMER_EXPIRED",
+	"FCx_PROTECTION_TIMER_EXPIRED",
+	"CRC_ERROR",
+	"RX_BUFFER_OVERFLOW",
+	"MAX_FRAME_LENGTH_EXCEEDED",
+	"WRONG_SEQUENCE_NUMBER",
+	"AFC_FRAME_SYNTAX_ERROR",
+	"NAC_FRAME_SYNTAX_ERROR",
+	"EOF_SYNTAX_ERROR",
+	"FRAME_SYNTAX_ERROR",
+	"BAD_CTRL_SYMBOL_TYPE",
+	"PA_INIT_ERROR",
+	"PA_ERROR_IND_RECEIVED",
+	"PA_INIT"
+};
+
 /*
  * Ref-clk control
  *
-- 
2.18.0