net: tsec: Fix Marvell 88E1121R phy init

This patch tries to ensure that phy interrupt pin
won't be asserted after booting. We experienced
following issues with current 88E1121R phy init:

Marvell 88E1121R phy can be hardware-configured
to share MDC/MDIO and interrupt pins for both ports
P0 and P1 (e.g. as configured on socrates board).
Port 0 interrupt pin will be shared by both ports
in such configuration. After booting Linux and
configuring eth0 interface, port 0 phy interrupts
are enabled. After rebooting without proper eth0
interface shutdown port 0 phy interrupts remain
enabled so any change on port 0 (link status, etc.)
cause assertion of the interrupt. Now booting Linux
and configuring eth1 interface will cause permanent
phy interrupt storm as the registered phy 1 interrupt
handler doesn't acknowledge phy 0 interrupts. This
of course should be fixed in Linux driver too.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Acked-by: Andy Fleming <afleming@freescale.com>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>

drivers/net/tsec.c

@@ -1196,6 +1196,9 @@ struct phy_info phy_info_M88E1121R = {
 			   {MIIM_88E1121_PHY_LED_CTRL, miim_read,
 			    &mii_88E1121_set_led},
 			   {MIIM_CONTROL, MIIM_CONTROL_INIT, &mii_cr_init},
+			   /* Disable IRQs and de-assert interrupt */
+			   {MIIM_88E1121_PHY_IRQ_EN, 0, NULL},
+			   {MIIM_88E1121_PHY_IRQ_STATUS, miim_read, NULL},
 			   {miim_end,}
 			   },
 	(struct phy_cmd[]){	/* startup */

include/tsec.h

@@ -226,6 +226,10 @@
 #define MIIM_88E1121_PHY_LED_PAGE	3
 #define MIIM_88E1121_PHY_LED_DEF	0x0030
 
+/* 88E1121 PHY IRQ Enable/Status Register */
+#define MIIM_88E1121_PHY_IRQ_EN		18
+#define MIIM_88E1121_PHY_IRQ_STATUS	19
+
 #define MIIM_88E1121_PHY_PAGE		22
 
 /* 88E1145 Extended PHY Specific Control Register */