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Message-Id: <1479742524-30222-2-git-send-email-jbrunet@baylibre.com>
Date: Mon, 21 Nov 2016 16:35:22 +0100
From: Jerome Brunet <jbrunet@...libre.com>
To: netdev@...r.kernel.org, devicetree@...r.kernel.org,
Florian Fainelli <f.fainelli@...il.com>
Cc: Jerome Brunet <jbrunet@...libre.com>,
Carlo Caione <carlo@...one.org>,
Kevin Hilman <khilman@...libre.com>,
Giuseppe Cavallaro <peppe.cavallaro@...com>,
Alexandre TORGUE <alexandre.torgue@...com>,
Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
Andre Roth <neolynx@...il.com>,
Neil Armstrong <narmstrong@...libre.com>,
linux-amlogic@...ts.infradead.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH net v2 1/3] net: phy: add an option to disable EEE advertisement
This patch adds an option to disable EEE advertisement in the generic PHY
by providing a mask of prohibited modes corresponding to the value found in
the MDIO_AN_EEE_ADV register.
On some platforms, PHY Low power idle seems to be causing issues, even
breaking the link some cases. The patch provides a convenient way for these
platforms to disable EEE advertisement and work around the issue.
Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
---
drivers/net/phy/phy.c | 3 ++
drivers/net/phy/phy_device.c | 80 +++++++++++++++++++++++++++++++++++++++-----
include/linux/phy.h | 3 ++
3 files changed, 77 insertions(+), 9 deletions(-)
diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index f424b867f73e..a44ee14bd953 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -1348,6 +1348,9 @@ int phy_ethtool_set_eee(struct phy_device *phydev, struct ethtool_eee *data)
{
int val = ethtool_adv_to_mmd_eee_adv_t(data->advertised);
+ /* Mask prohibited EEE modes */
+ val &= ~phydev->eee_advert_disabled;
+
phy_write_mmd_indirect(phydev, MDIO_AN_EEE_ADV, MDIO_MMD_AN, val);
return 0;
diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 1a4bf8acad78..74c628e046cb 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -1116,6 +1116,43 @@ static int genphy_config_advert(struct phy_device *phydev)
}
/**
+ * genphy_config_eee_advert - disable unwanted eee mode advertisement
+ * @phydev: target phy_device struct
+ *
+ * Description: Writes MDIO_AN_EEE_ADV after disabling unsupported energy
+ * efficent ethernet modes. Returns 0 if the PHY's advertisement hasn't
+ * changed, and 1 if it has changed.
+ */
+static int genphy_config_eee_advert(struct phy_device *phydev)
+{
+ u32 disabled = phydev->eee_advert_disabled;
+ u32 old_adv, adv;
+
+ /* Nothing to disable */
+ if (!disabled)
+ return 0;
+
+ /* If the following call fails, we assume that EEE is not
+ * supported by the phy. If we read 0, EEE is not advertised
+ * In both case, we don't need to continue
+ */
+ adv = phy_read_mmd_indirect(phydev, MDIO_AN_EEE_ADV, MDIO_MMD_AN);
+ if (adv <= 0)
+ return 0;
+
+ old_adv = adv;
+ adv &= ~disabled;
+
+ /* Advertising remains unchanged with the ban */
+ if (old_adv == adv)
+ return 0;
+
+ phy_write_mmd_indirect(phydev, MDIO_AN_EEE_ADV, MDIO_MMD_AN, adv);
+
+ return 1;
+}
+
+/**
* genphy_setup_forced - configures/forces speed/duplex from @phydev
* @phydev: target phy_device struct
*
@@ -1173,15 +1210,20 @@ EXPORT_SYMBOL(genphy_restart_aneg);
*/
int genphy_config_aneg(struct phy_device *phydev)
{
- int result;
+ int err, changed;
+
+ changed = genphy_config_eee_advert(phydev);
if (AUTONEG_ENABLE != phydev->autoneg)
return genphy_setup_forced(phydev);
- result = genphy_config_advert(phydev);
- if (result < 0) /* error */
- return result;
- if (result == 0) {
+ err = genphy_config_advert(phydev);
+ if (err < 0) /* error */
+ return err;
+
+ changed |= err;
+
+ if (changed == 0) {
/* Advertisement hasn't changed, but maybe aneg was never on to
* begin with? Or maybe phy was isolated?
*/
@@ -1191,16 +1233,16 @@ int genphy_config_aneg(struct phy_device *phydev)
return ctl;
if (!(ctl & BMCR_ANENABLE) || (ctl & BMCR_ISOLATE))
- result = 1; /* do restart aneg */
+ changed = 1; /* do restart aneg */
}
/* Only restart aneg if we are advertising something different
* than we were before.
*/
- if (result > 0)
- result = genphy_restart_aneg(phydev);
+ if (changed > 0)
+ return genphy_restart_aneg(phydev);
- return result;
+ return 0;
}
EXPORT_SYMBOL(genphy_config_aneg);
@@ -1558,6 +1600,21 @@ static void of_set_phy_supported(struct phy_device *phydev)
__set_phy_supported(phydev, max_speed);
}
+static void of_set_phy_eee_disable(struct phy_device *phydev)
+{
+ struct device_node *node = phydev->mdio.dev.of_node;
+ u32 disabled;
+
+ if (!IS_ENABLED(CONFIG_OF_MDIO))
+ return;
+
+ if (!node)
+ return;
+
+ if (!of_property_read_u32(node, "eee-advert-disable", &disabled))
+ phydev->eee_advert_disabled = disabled;
+}
+
/**
* phy_probe - probe and init a PHY device
* @dev: device to probe and init
@@ -1595,6 +1652,11 @@ static int phy_probe(struct device *dev)
of_set_phy_supported(phydev);
phydev->advertising = phydev->supported;
+ /* Get the EEE modes we want to prohibit. We will ask
+ * the PHY stop advertising these mode later on
+ */
+ of_set_phy_eee_disable(phydev);
+
/* Set the state to READY by default */
phydev->state = PHY_READY;
diff --git a/include/linux/phy.h b/include/linux/phy.h
index e25f1830fbcf..7f2ea0af16d1 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -401,6 +401,9 @@ struct phy_device {
u32 advertising;
u32 lp_advertising;
+ /* Energy efficient ethernet modes which should be prohibited */
+ u32 eee_advert_disabled;
+
int autoneg;
int link_timeout;
--
2.7.4
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