nmhw21: add configuration option for Ethernet link timeout

- env variable linktimeout defines timeout in milliseconds
- valid range is 1000 to 10000 ms
- default timeout is 5 seconds

BugzID: 55019

board/nm/nmhw21/board.c

@@ -494,6 +494,40 @@ void sdram_init(void)
 
 #if !defined(CONFIG_SPL_BUILD)
 
+/* 
+ * Override for Ethernet link timeout definition, 
+ * with option to specify via environment variable linktimeout 
+ */
+int eth_phy_timeout(void)
+{
+	const char* timeout_env = NULL;
+	int timeout;
+
+	timeout = PHY_ANEG_DEFAULT_TIMEOUT;
+
+	/* 
+	 * Check if timeout has been defined by environment.
+	 * Valid range: 1000..10000 milliseconds
+	 */
+	timeout_env = getenv("linktimeout");
+	if (timeout_env != NULL) {
+		timeout = simple_strtoul(timeout_env, NULL, 10);
+		if (timeout == 0) {
+			timeout = PHY_ANEG_DEFAULT_TIMEOUT;
+		} else if (timeout < 1000) {
+			timeout = 1000;
+		} else if (timeout > 10000) {
+			timeout = 10000;
+		}
+	}
+
+	return timeout;
+}
+
+#endif /* !defined(CONFIG_SPL_BUILD) */
+
+#if !defined(CONFIG_SPL_BUILD)
+
 static void init_ethernet(void)
 {
 	REQUEST_AND_CLEAR_GPIO(GPIO_RST_ETH_N);
@@ -899,7 +933,6 @@ static void check_reset_button(void)
 
 #endif /* !defined(CONFIG_SPL_BUILD) */
 
-
 int board_late_init(void)
 {
 #if !defined(CONFIG_SPL_BUILD)

drivers/net/phy/phy.c

@@ -222,9 +222,11 @@ int genphy_update_link(struct phy_device *phydev)
 {
 	unsigned int mii_reg;
 
-	/* TODO */
+#ifdef __CONFIG_AM335X_NRHW20_H
+	/* TODO: Check and remove this NRHW20 work around */
 	phydev->link = 1;
 	return 0;
+#endif
 
 	/*
 	 * Wait if the link is up, and autonegotiation is in progress
@@ -241,6 +243,7 @@ int genphy_update_link(struct phy_device *phydev)
 
 	if ((phydev->autoneg == AUTONEG_ENABLE) &&
 	    !(mii_reg & BMSR_ANEGCOMPLETE)) {
+		const int timeout = PHY_ANEG_TIMEOUT;
 		int i = 0;
 
 		printf("%s Waiting for PHY auto negotiation to complete",
@@ -249,7 +252,7 @@ int genphy_update_link(struct phy_device *phydev)
 			/*
 			 * Timeout reached ?
 			 */
-			if (i > PHY_ANEG_TIMEOUT) {
+			if (i > timeout) {
 				printf(" TIMEOUT !\n");
 				phydev->link = 0;
 				return -ETIMEDOUT;

include/configs/am335x_nmhw21.h

@@ -42,6 +42,15 @@
 
 #include <config_distro_bootcmd.h>
 
+/* Dynamic override for PHY_ANEG_TIMEOUT value */
+#ifndef CONFIG_SPL_BUILD
+# ifndef __ASSEMBLER__
+int eth_phy_timeout(void);
+# endif
+#endif
+#define PHY_ANEG_TIMEOUT		eth_phy_timeout()
+#define PHY_ANEG_DEFAULT_TIMEOUT	5000
+
 #define CONFIG_ARP_TIMEOUT		200
 #undef CONFIG_NET_RETRY_COUNT
 #define CONFIG_NET_RETRY_COUNT		5
@@ -241,7 +250,6 @@ Memory map:
 #define CONFIG_PHYLIB
 #define CONFIG_PHY_SMSC
 
-
 #define CONFIG_CMD_MEMTEST
 #define CONFIG_SYS_MEMTEST_START    0x84000000
 #define CONFIG_SYS_MEMTEST_END      0x87900000