scsi: ufs-mediatek: add dbg_register_dump implementation

Add dbg_register_dump variant vendor implementation in MediaTek UFS driver.

Link: https://lore.kernel.org/r/[e-mail]
Reviewed-by: Alim Akhtar <[e-mail]>
Signed-off-by: Stanley Chu <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/ufs/ufs-mediatek.c

···
 	return 0;
 }
 
+static void ufs_mtk_dbg_register_dump(struct ufs_hba *hba)
+{
+	ufshcd_dump_regs(hba, REG_UFS_REFCLK_CTRL, 0x4, "Ref-Clk Ctrl ");
+
+	ufshcd_dump_regs(hba, REG_UFS_EXTREG, 0x4, "Ext Reg ");
+
+	ufshcd_dump_regs(hba, REG_UFS_MPHYCTRL,
+			 REG_UFS_REJECT_MON - REG_UFS_MPHYCTRL + 4,
+			 "MPHY Ctrl ");
+
+	/* Direct debugging information to REG_MTK_PROBE */
+	ufshcd_writel(hba, 0x20, REG_UFS_DEBUG_SEL);
+	ufshcd_dump_regs(hba, REG_UFS_PROBE, 0x4, "Debug Probe ");
+}
+
 static int ufs_mtk_apply_dev_quirks(struct ufs_hba *hba,
 				    struct ufs_dev_desc *card)
 {
···
 	.apply_dev_quirks    = ufs_mtk_apply_dev_quirks,
 	.suspend             = ufs_mtk_suspend,
 	.resume              = ufs_mtk_resume,
+	.dbg_register_dump   = ufs_mtk_dbg_register_dump,
 	.device_reset        = ufs_mtk_device_reset,
 };
 

drivers/scsi/ufs/ufs-mediatek.h

···
  * Vendor specific UFSHCI Registers
  */
 #define REG_UFS_REFCLK_CTRL         0x144
+#define REG_UFS_EXTREG              0x2100
+#define REG_UFS_MPHYCTRL            0x2200
+#define REG_UFS_REJECT_MON          0x22AC
+#define REG_UFS_DEBUG_SEL           0x22C0
+#define REG_UFS_PROBE               0x22C8
 
 /*
  * Ref-clk control