linux-kernel - [PATCH 13/14] phy: cadence-torrent: Add debug information for PHY configuration

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Date:   Fri, 9 Apr 2021 07:34:15 +0200
From:   Swapnil Jakhade <sjakhade@...ence.com>
To:     <vkoul@...nel.org>, <kishon@...com>, <p.zabel@...gutronix.de>,
        <linux-phy@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
CC:     <mparab@...ence.com>, <sjakhade@...ence.com>, <lokeshvutla@...com>
Subject: [PATCH 13/14] phy: cadence-torrent: Add debug information for PHY configuration

Display information in probe regarding PHY configuration parameters like
single link or multilink protocol information along with number of lanes
used for each protocol link.

Signed-off-by: Swapnil Jakhade <sjakhade@...ence.com>
---
 drivers/phy/cadence/phy-cadence-torrent.c | 32 +++++++++++++++++++++--
 1 file changed, 30 insertions(+), 2 deletions(-)

diff --git a/drivers/phy/cadence/phy-cadence-torrent.c b/drivers/phy/cadence/phy-cadence-torrent.c
index bf37569c6c51..39145e56e061 100644
--- a/drivers/phy/cadence/phy-cadence-torrent.c
+++ b/drivers/phy/cadence/phy-cadence-torrent.c
@@ -574,6 +574,24 @@ static const struct coefficients vltg_coeff[4][4] = {
 	}
 };
 
+static const char *cdns_torrent_get_phy_type(enum cdns_torrent_phy_type phy_type)
+{
+	switch (phy_type) {
+	case TYPE_DP:
+		return "DisplayPort";
+	case TYPE_PCIE:
+		return "PCIe";
+	case TYPE_SGMII:
+		return "SGMII";
+	case TYPE_QSGMII:
+		return "QSGMII";
+	case TYPE_USB:
+		return "USB";
+	default:
+		return "None";
+	}
+}
+
 /*
  * Set registers responsible for enabling and configuring SSC, with second and
  * third register values provided by parameters.
@@ -2504,8 +2522,7 @@ static int cdns_torrent_phy_probe(struct platform_device *pdev)
 				init_dp_regmap++;
 			}
 
-			dev_info(dev, "%d lanes, max bit rate %d.%03d Gbps\n",
-				 cdns_phy->phys[node].num_lanes,
+			dev_info(dev, "DP max bit rate %d.%03d Gbps\n",
 				 cdns_phy->max_bit_rate / 1000,
 				 cdns_phy->max_bit_rate % 1000);
 
@@ -2539,6 +2556,17 @@ static int cdns_torrent_phy_probe(struct platform_device *pdev)
 		goto put_lnk_rst;
 	}
 
+	if (cdns_phy->nsubnodes > 1)
+		dev_info(dev, "%s (%d lanes) & %s (%d lanes)",
+			 cdns_torrent_get_phy_type(cdns_phy->phys[0].phy_type),
+			 cdns_phy->phys[0].num_lanes,
+			 cdns_torrent_get_phy_type(cdns_phy->phys[1].phy_type),
+			 cdns_phy->phys[1].num_lanes);
+	else
+		dev_info(dev, "%s (%d lanes)",
+			 cdns_torrent_get_phy_type(cdns_phy->phys[0].phy_type),
+			 cdns_phy->phys[0].num_lanes);
+
 	return 0;
 
 put_child:
-- 
2.26.1