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at803x: fix suspend/resume for SGMII link 

When operating the at803x in SGMII mode, resuming the chip
from power down brings up the copper-side link but leaves
the SGMII link in unconnected state (tested with at8031
attached to gianfar). In effect, this caused a permanent
link loss once the related interface was put down.

This patch ensures that power down handling in supspend()
and resume() is also applied to the SGMII link.

Signed-off-by: Zefir Kurtisi <zefir.kurtisi@neratec.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Zefir Kurtisi 2016-03-11 15:31:53 +01:00 committed by David S. Miller
parent 5d6084142e
commit 98267311fe
1 changed files with 26 additions and 0 deletions
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26
drivers/net/phy/at803x.c
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@ -52,6 +52,9 @@
#define AT803X_DEBUG_REG_5 0x05
#define AT803X_DEBUG_TX_CLK_DLY_EN BIT(8)
#define AT803X_REG_CHIP_CONFIG 0x1f
#define AT803X_BT_BX_REG_SEL 0x8000
#define ATH8030_PHY_ID 0x004dd076
#define ATH8031_PHY_ID 0x004dd074
#define ATH8035_PHY_ID 0x004dd072
@ -206,6 +209,7 @@ static int at803x_suspend(struct phy_device *phydev)
{
int value;
int wol_enabled;
int ccr;
mutex_lock(&phydev->lock);
@ -221,6 +225,16 @@ static int at803x_suspend(struct phy_device *phydev)
phy_write(phydev, MII_BMCR, value);
if (phydev->interface != PHY_INTERFACE_MODE_SGMII)
goto done;
/* also power-down SGMII interface */
ccr = phy_read(phydev, AT803X_REG_CHIP_CONFIG);
phy_write(phydev, AT803X_REG_CHIP_CONFIG, ccr & ~AT803X_BT_BX_REG_SEL);
phy_write(phydev, MII_BMCR, phy_read(phydev, MII_BMCR) | BMCR_PDOWN);
phy_write(phydev, AT803X_REG_CHIP_CONFIG, ccr | AT803X_BT_BX_REG_SEL);
done:
mutex_unlock(&phydev->lock);
return 0;
@ -229,6 +243,7 @@ static int at803x_suspend(struct phy_device *phydev)
static int at803x_resume(struct phy_device *phydev)
{
int value;
int ccr;
mutex_lock(&phydev->lock);
@ -236,6 +251,17 @@ static int at803x_resume(struct phy_device *phydev)
value &= ~(BMCR_PDOWN | BMCR_ISOLATE);
phy_write(phydev, MII_BMCR, value);
if (phydev->interface != PHY_INTERFACE_MODE_SGMII)
goto done;
/* also power-up SGMII interface */
ccr = phy_read(phydev, AT803X_REG_CHIP_CONFIG);
phy_write(phydev, AT803X_REG_CHIP_CONFIG, ccr & ~AT803X_BT_BX_REG_SEL);
value = phy_read(phydev, MII_BMCR) & ~(BMCR_PDOWN | BMCR_ISOLATE);
phy_write(phydev, MII_BMCR, value);
phy_write(phydev, AT803X_REG_CHIP_CONFIG, ccr | AT803X_BT_BX_REG_SEL);
done:
mutex_unlock(&phydev->lock);
return 0;