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net: phy: broadcom: Add IDDQ-SR mode

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Add support for putting the PHY into IDDQ Soft Recovery mode by setting
the TOP_MISC register bits accordingly. This requires us to implement a
custom bcm54xx_suspend() routine which diverges from genphy_suspend() in
order to configure the PHY to enter IDDQ with software recovery as well
as avoid doing a read/modify/write on the BMCR register.

Doing a read/modify/write on the BMCR register means that the
auto-negotation bit may remain which interferes with the ability to put
the PHY into IDDQ-SR mode. We do software reset upon suspend in order to
put the PHY back into its state prior to suspend as recommended by the
datasheet.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Fainelli 2021-09-20 14:54:14 -07:00 committed by David S. Miller
parent c595b120eb
commit d6da08ed14
2 changed files with 59 additions and 0 deletions
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51
drivers/net/phy/broadcom.c
View File

@ -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,

8
include/linux/brcmphy.h
View File

@ -67,6 +67,7 @@
#define PHY_BRCM_CLEAR_RGMII_MODE 0x00000004
#define PHY_BRCM_DIS_TXCRXC_NOENRGY 0x00000008
#define PHY_BRCM_EN_MASTER_MODE 0x00000010
#define PHY_BRCM_IDDQ_SUSPEND 0x000000220
/* Broadcom BCM7xxx specific workarounds */
#define PHY_BRCM_7XXX_REV(x) (((x) >> 8) & 0xff)
@ -84,6 +85,7 @@
#define MII_BCM54XX_EXP_DATA 0x15 /* Expansion register data */
#define MII_BCM54XX_EXP_SEL 0x17 /* Expansion register select */
#define MII_BCM54XX_EXP_SEL_TOP 0x0d00 /* TOP_MISC expansion register select */
#define MII_BCM54XX_EXP_SEL_SSD 0x0e00 /* Secondary SerDes select */
#define MII_BCM54XX_EXP_SEL_ER 0x0f00 /* Expansion register select */
#define MII_BCM54XX_EXP_SEL_ETC 0x0d00 /* Expansion register spare + 2k mem */
@ -243,6 +245,12 @@
#define MII_BCM54XX_EXP_EXP97 0x0f97
#define MII_BCM54XX_EXP_EXP97_MYST 0x0c0c
/* Top-MISC expansion registers */
#define BCM54XX_TOP_MISC_IDDQ_CTRL (MII_BCM54XX_EXP_SEL_TOP + 0x06)
#define BCM54XX_TOP_MISC_IDDQ_LP (1 << 0)
#define BCM54XX_TOP_MISC_IDDQ_SD (1 << 2)
#define BCM54XX_TOP_MISC_IDDQ_SR (1 << 3)
/*
* BCM5482: Secondary SerDes registers
*/