[PATCH 4.19 268/313] net: systemport: Fix WoL with password after deep sleep

Greg Kroah-Hartman
2019-02-11T14:51:31Z

From: Florian Fainelli <f.fainelli@gmail.com>

[ Upstream commit 8dfb8d2cceb76b74ad5b58cc65c75994329b4d5e ]

Broadcom STB chips support a deep sleep mode where all register
contents are lost. Because we were stashing the MagicPacket password
into some of these registers a suspend into that deep sleep then a
resumption would not lead to being able to wake-up from MagicPacket with
password again.

Fix this by keeping a software copy of the password and program it
during suspend.

Fixes: 83e82f4c706b ("net: systemport: add Wake-on-LAN support")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/ethernet/broadcom/bcmsysport.c | 25 ++++++++++---------------
drivers/net/ethernet/broadcom/bcmsysport.h | 2 ++
2 files changed, 12 insertions(+), 15 deletions(-)

--- a/drivers/net/ethernet/broadcom/bcmsysport.c
+++ b/drivers/net/ethernet/broadcom/bcmsysport.c
@@ -519,7 +519,6 @@ static void bcm_sysport_get_wol(struct n
struct ethtool_wolinfo *wol)
{
struct bcm_sysport_priv *priv = netdev_priv(dev);
- u32 reg;

wol->supported = WAKE_MAGIC | WAKE_MAGICSECURE | WAKE_FILTER;
wol->wolopts = priv->wolopts;
@@ -527,11 +526,7 @@ static void bcm_sysport_get_wol(struct n
if (!(priv->wolopts & WAKE_MAGICSECURE))
return;

- /* Return the programmed SecureOn password */
- reg = umac_readl(priv, UMAC_PSW_MS);
- put_unaligned_be16(reg, &wol->sopass[0]);
- reg = umac_readl(priv, UMAC_PSW_LS);
- put_unaligned_be32(reg, &wol->sopass[2]);
+ memcpy(wol->sopass, priv->sopass, sizeof(priv->sopass));
}

static int bcm_sysport_set_wol(struct net_device *dev,
@@ -547,13 +542,8 @@ static int bcm_sysport_set_wol(struct ne
if (wol->wolopts & ~supported)
return -EINVAL;

- /* Program the SecureOn password */
- if (wol->wolopts & WAKE_MAGICSECURE) {
- umac_writel(priv, get_unaligned_be16(&wol->sopass[0]),
- UMAC_PSW_MS);
- umac_writel(priv, get_unaligned_be32(&wol->sopass[2]),
- UMAC_PSW_LS);
- }
+ if (wol->wolopts & WAKE_MAGICSECURE)
+ memcpy(priv->sopass, wol->sopass, sizeof(priv->sopass));

/* Flag the device and relevant IRQ as wakeup capable */
if (wol->wolopts) {
@@ -2588,13 +2578,18 @@ static int bcm_sysport_suspend_to_wol(st
unsigned int index, i = 0;
u32 reg;

- /* Password has already been programmed */
reg = umac_readl(priv, UMAC_MPD_CTRL);
if (priv->wolopts & (WAKE_MAGIC | WAKE_MAGICSECURE))
reg |= MPD_EN;
reg &= ~PSW_EN;
- if (priv->wolopts & WAKE_MAGICSECURE)
+ if (priv->wolopts & WAKE_MAGICSECURE) {
+ /* Program the SecureOn password */
+ umac_writel(priv, get_unaligned_be16(&priv->sopass[0]),
+ UMAC_PSW_MS);
+ umac_writel(priv, get_unaligned_be32(&priv->sopass[2]),
+ UMAC_PSW_LS);
reg |= PSW_EN;
+ }
umac_writel(priv, reg, UMAC_MPD_CTRL);

if (priv->wolopts & WAKE_FILTER) {
--- a/drivers/net/ethernet/broadcom/bcmsysport.h
+++ b/drivers/net/ethernet/broadcom/bcmsysport.h
@@ -12,6 +12,7 @@
#define __BCM_SYSPORT_H

#include <linux/bitmap.h>
+#include <linux/ethtool.h>
#include <linux/if_vlan.h>
#include <linux/net_dim.h>

@@ -776,6 +777,7 @@ struct bcm_sysport_priv {
unsigned int crc_fwd:1;
u16 rev;
u32 wolopts;
+ u8 sopass[SOPASS_MAX];
unsigned int wol_irq_disabled:1;

/* MIB related fields */