From: Florin Chiculita <florinlaurentiu.chiculita@nxp.com>
Date: Mon, 14 Oct 2019 14:27:07 +0000 (+0300)
Subject: net: phy: aquantia: wait for phy init sequence to finish
X-Git-Tag: v2020.10~454^2~34
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=bf58916373f0a94aaf0aca5ee67bb18d5928fa0e;p=platform%2Fkernel%2Fu-boot.git

net: phy: aquantia: wait for phy init sequence to finish

Aquantia quad-phys may take longer to initialize. This commit adds
a polling mechanism for a global alarm bit that tells if phy init
sequence is completed.

Signed-off-by: Florin Chiculita <florinlaurentiu.chiculita@nxp.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
---

diff --git a/drivers/net/phy/aquantia.c b/drivers/net/phy/aquantia.c
index 465ec2d..1061fdf 100644
--- a/drivers/net/phy/aquantia.c
+++ b/drivers/net/phy/aquantia.c
@@ -37,6 +37,9 @@
 #define GLOBAL_FAULT 0xc850
 #define GLOBAL_RSTATUS_1 0xc885
 
+#define GLOBAL_ALARM_1 0xcc00
+#define SYSTEM_READY_BIT 0x40
+
 #define GLOBAL_STANDARD_CONTROL 0x0
 #define SOFT_RESET BIT(15)
 #define LOW_POWER BIT(11)
@@ -258,6 +261,18 @@ int aquantia_config(struct phy_device *phydev)
 {
 	u32 val, id, rstatus, fault;
 	u32 reg_val1 = 0;
+	int num_retries = 5;
+
+	/*
+	 * check if the system is out of reset and init sequence completed.
+	 * chip-wide reset for gen1 quad phys takes longer
+	 */
+	while (--num_retries) {
+		rstatus = phy_read(phydev, MDIO_MMD_VEND1, GLOBAL_ALARM_1);
+		if (rstatus & SYSTEM_READY_BIT)
+			break;
+		mdelay(10);
+	}
 
 	id = phy_read(phydev, MDIO_MMD_VEND1, GLOBAL_FIRMWARE_ID);
 	rstatus = phy_read(phydev, MDIO_MMD_VEND1, GLOBAL_RSTATUS_1);