Merge branch 'iddq-sr-mode'

Florian Fainelli says:

====================
net: phy: broadcom: IDDQ-SR mode

This patch series adds support for the IDDQ with soft recovery mode
which allows power savings of roughly 150mW compared to a simple
BMCR.PDOWN power off (called standby power down in Broadcom datasheets).

In order to leverage these modes we add a new PHY driver flags for
drivers to opt-in for that behavior, the PHY driver is modified to do
the appropriate programming and the PHYs on which this was tested get
updated to have an appropriate suspend/resume set of functions.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 63 insertions, 4 deletions

diff --git a/drivers/net/dsa/bcm_sf2.c b/drivers/net/dsa/bcm_sf2.c
index 6ce9ec1283e0..aa713936d77c 100644
--- a/drivers/net/dsa/bcm_sf2.c
+++ b/drivers/net/dsa/bcm_sf2.c
@@ -667,7 +667,9 @@ static u32 bcm_sf2_sw_get_phy_flags(struct dsa_switch *ds, int port)
 	if (priv->int_phy_mask & BIT(port))
 		return priv->hw_params.gphy_rev;
 	else
-		return 0;
+		return PHY_BRCM_AUTO_PWRDWN_ENABLE |
+		       PHY_BRCM_DIS_TXCRXC_NOENRGY |
+		       PHY_BRCM_IDDQ_SUSPEND;
 }
 
 static void bcm_sf2_sw_validate(struct dsa_switch *ds, int port,
diff --git a/drivers/net/ethernet/broadcom/genet/bcmmii.c b/drivers/net/ethernet/broadcom/genet/bcmmii.c
index 2d29de9a33e3..ff1efd52ce16 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmmii.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmmii.c
@@ -288,7 +288,9 @@ int bcmgenet_mii_probe(struct net_device *dev)
 	struct device_node *dn = kdev->of_node;
 	phy_interface_t phy_iface = priv->phy_interface;
 	struct phy_device *phydev;
-	u32 phy_flags = 0;
+	u32 phy_flags = PHY_BRCM_AUTO_PWRDWN_ENABLE |
+			PHY_BRCM_DIS_TXCRXC_NOENRGY |
+			PHY_BRCM_IDDQ_SUSPEND;
 	int ret;
 
 	/* Communicate the integrated PHY revision */
diff --git a/drivers/net/phy/broadcom.c b/drivers/net/phy/broadcom.c
index add0c4e33425..bb5104ae4610 100644
--- a/drivers/net/phy/broadcom.c
+++ b/drivers/net/phy/broadcom.c
@@ -392,10 +392,50 @@ static int bcm54xx_config_init(struct phy_device *phydev)
 	return 0;
 }
 
+static int bcm54xx_iddq_set(struct phy_device *phydev, bool enable)
+{
+	int ret = 0;
+
+	if (!(phydev->dev_flags & PHY_BRCM_IDDQ_SUSPEND))
+		return ret;
+
+	ret = bcm_phy_read_exp(phydev, BCM54XX_TOP_MISC_IDDQ_CTRL);
+	if (ret < 0)
+		goto out;
+
+	if (enable)
+		ret |= BCM54XX_TOP_MISC_IDDQ_SR | BCM54XX_TOP_MISC_IDDQ_LP;
+	else
+		ret &= ~(BCM54XX_TOP_MISC_IDDQ_SR | BCM54XX_TOP_MISC_IDDQ_LP);
+
+	ret = bcm_phy_write_exp(phydev, BCM54XX_TOP_MISC_IDDQ_CTRL, ret);
+out:
+	return ret;
+}
+
+static int bcm54xx_suspend(struct phy_device *phydev)
+{
+	int ret;
+
+	/* We cannot use a read/modify/write here otherwise the PHY gets into
+	 * a bad state where its LEDs keep flashing, thus defeating the purpose
+	 * of low power mode.
+	 */
+	ret = phy_write(phydev, MII_BMCR, BMCR_PDOWN);
+	if (ret < 0)
+		return ret;
+
+	return bcm54xx_iddq_set(phydev, true);
+}
+
 static int bcm54xx_resume(struct phy_device *phydev)
 {
 	int ret;
 
+	ret = bcm54xx_iddq_set(phydev, false);
+	if (ret < 0)
+		return ret;
+
 	/* Writes to register other than BMCR would be ignored
 	 * unless we clear the PDOWN bit first
 	 */
@@ -408,6 +448,15 @@ static int bcm54xx_resume(struct phy_device *phydev)
 	 */
 	fsleep(40);
 
+	/* Issue a soft reset after clearing the power down bit
+	 * and before doing any other configuration.
+	 */
+	if (phydev->dev_flags & PHY_BRCM_IDDQ_SUSPEND) {
+		ret = genphy_soft_reset(phydev);
+		if (ret < 0)
+			return ret;
+	}
+
 	return bcm54xx_config_init(phydev);
 }
 
@@ -772,6 +821,8 @@ static struct phy_driver broadcom_drivers[] = {
 	.config_intr	= bcm_phy_config_intr,
 	.handle_interrupt = bcm_phy_handle_interrupt,
 	.link_change_notify	= bcm54xx_link_change_notify,
+	.suspend	= bcm54xx_suspend,
+	.resume		= bcm54xx_resume,
 }, {
 	.phy_id		= PHY_ID_BCM5461,
 	.phy_id_mask	= 0xfffffff0,
@@ -852,7 +903,7 @@ static struct phy_driver broadcom_drivers[] = {
 	.config_aneg    = bcm5481_config_aneg,
 	.config_intr    = bcm_phy_config_intr,
 	.handle_interrupt = bcm_phy_handle_interrupt,
-	.suspend	= genphy_suspend,
+	.suspend	= bcm54xx_suspend,
 	.resume		= bcm54xx_resume,
 	.link_change_notify	= bcm54xx_link_change_notify,
 }, {
@@ -868,7 +919,7 @@ static struct phy_driver broadcom_drivers[] = {
 	.config_aneg    = bcm5481_config_aneg,
 	.config_intr    = bcm_phy_config_intr,
 	.handle_interrupt = bcm_phy_handle_interrupt,
-	.suspend	= genphy_suspend,
+	.suspend	= bcm54xx_suspend,
 	.resume		= bcm54xx_resume,
 	.link_change_notify	= bcm54xx_link_change_notify,
 }, {
@@ -897,6 +948,8 @@ static struct phy_driver broadcom_drivers[] = {
 	.config_intr	= bcm_phy_config_intr,
 	.handle_interrupt = bcm_phy_handle_interrupt,
 	.link_change_notify	= bcm54xx_link_change_notify,
+	.suspend	= bcm54xx_suspend,
+	.resume		= bcm54xx_resume,
 }, {
 	.phy_id		= PHY_ID_BCM50610M,
 	.phy_id_mask	= 0xfffffff0,
@@ -910,6 +963,8 @@ static struct phy_driver broadcom_drivers[] = {
 	.config_intr	= bcm_phy_config_intr,
 	.handle_interrupt = bcm_phy_handle_interrupt,
 	.link_change_notify	= bcm54xx_link_change_notify,
+	.suspend	= bcm54xx_suspend,
+	.resume		= bcm54xx_resume,
 }, {
 	.phy_id		= PHY_ID_BCM57780,
 	.phy_id_mask	= 0xfffffff0,