RE: [PATCH 2/6] net: macb: add support for sgmii MAC-PHY interface

quoted

@@ -159,6 +160,9 @@
 #define GEM_PEFTN		0x01f4 /* PTP Peer Event Frame Tx Ns */
 #define GEM_PEFRSL		0x01f8 /* PTP Peer Event Frame Rx Sec Low */
 #define GEM_PEFRN		0x01fc /* PTP Peer Event Frame Rx Ns */
+#define GEM_PCS_CTRL		0x0200 /* PCS Control */
+#define GEM_PCS_STATUS          0x0204 /* PCS Status */
+#define GEM_PCS_AN_LP_BASE      0x0214 /* PCS AN LP BASE*/

It looks like there are some space vs tab issues here and else where.

Ok, I will fix space vs tab issue.

quoted

 static int gem_phylink_mac_link_state(struct phylink_config *pl_config,
 				      struct phylink_link_state *state)  {
+	u32 status;
 	struct net_device *netdev = to_net_dev(pl_config->dev);
 	struct macb *bp = netdev_priv(netdev);

Reverse christmas tree please, here and everywhere you add new variables.

Yes, sure. I will make take change.

quoted

-	state->speed = bp->speed;
-	state->duplex = bp->duplex;
-	state->link = bp->link;
+	if (bp->phy_interface == PHY_INTERFACE_MODE_SGMII) {
+		status = gem_readl(bp, PCS_STATUS);
+		state->an_complete = GEM_BFEXT(PCS_STATUS_AN_DONE,

status);

quoted

+		status = gem_readl(bp, PCS_AN_LP_BASE);
+		switch (GEM_BFEXT(PCS_AN_LP_BASE_SPEED, status)) {
+		case 0:
+			state->speed = 10;
+			break;
+		case 1:
+			state->speed = 100;
+			break;
+		case 2:
+			state->speed = 1000;
+			break;
+		default:
+			break;

It would be nice to use SPEED_10, SPEED_100, etc.

Yes, sure. I will make take change.

quoted

@@ -494,17 +551,23 @@ static void gem_mac_config(struct phylink_config

*pl_config, unsigned int mode,

quoted

 		reg &= ~(MACB_BIT(SPD) | MACB_BIT(FD));
 		if (macb_is_gem(bp))
 			reg &= ~GEM_BIT(GBE);
-
 		if (state->duplex)
 			reg |= MACB_BIT(FD);
-		if (state->speed == SPEED_100)
-			reg |= MACB_BIT(SPD);
-		if (state->speed == SPEED_1000 &&
-		    bp->caps & MACB_CAPS_GIGABIT_MODE_AVAILABLE)
-			reg |= GEM_BIT(GBE);
-
 		macb_or_gem_writel(bp, NCFGR, reg);

+		if (state->speed == SPEED_2500) {
+			gem_writel(bp, NCFGR, GEM_BIT(GBE) |
+				   gem_readl(bp, NCFGR));
+			gem_writel(bp, NCR, GEM_BIT(TWO_PT_FIVE_GIG) |
+				   gem_readl(bp, NCR));
+		} else if (state->speed == SPEED_1000) {
+			gem_writel(bp, NCFGR, GEM_BIT(GBE) |
+				   gem_readl(bp, NCFGR));
+		} else if (state->speed == SPEED_100) {
+			macb_writel(bp, NCFGR, MACB_BIT(SPD) |
+				    macb_readl(bp, NCFGR));
+		}

Maybe a switch statement?

This suggested to be part of helper function in other patch.
I will add switch in helper inline function replacement of this code.

quoted

@@ -4232,11 +4327,37 @@ static int macb_probe(struct platform_device

*pdev)

quoted

 	}

 	err = of_get_phy_mode(np);

The following code would be more readable if you replaced err with phy_mode,
or interface.

Ok, sure.

quoted

-	if (err < 0)
+	if (err < 0) {
 		/* not found in DT, MII by default */
 		bp->phy_interface = PHY_INTERFACE_MODE_MII;
-	else
+	} else if (bp->caps & MACB_CAPS_MACB_IS_GEM_GXL) {
+		u32 interface_supported = 1;
+
+		if (err == PHY_INTERFACE_MODE_SGMII ||
+		    err == PHY_INTERFACE_MODE_1000BASEX ||
+		    err == PHY_INTERFACE_MODE_2500BASEX) {
+			if (!(bp->caps & MACB_CAPS_PCS))
+				interface_supported = 0;
+		} else if (err == PHY_INTERFACE_MODE_GMII ||
+			   err == PHY_INTERFACE_MODE_RGMII) {
+			if (!macb_is_gem(bp))
+				interface_supported = 0;
+		} else if (err != PHY_INTERFACE_MODE_RMII &&
+			   err != PHY_INTERFACE_MODE_MII) {
+			/* Add new mode before this */
+			interface_supported = 0;
+		}
+
+		if (!interface_supported) {
+			netdev_err(dev, "Phy mode %s not supported",
+				   phy_modes(err));
+			goto err_out_free_netdev;
+		}
+
 		bp->phy_interface = err;
+	} else {
+		bp->phy_interface = err;
+	}

 Andrew

Regards,
Parshuram Thombare