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SubjectRe: [PATCH net-next v2 3/3] net: phy: broadcom: Allow BCM54210E to configure APD
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On 2/14/2021 8:29 PM, Florian Fainelli wrote:
>
>
> On 2/13/2021 2:42 AM, Vladimir Oltean wrote:
>> On Fri, Feb 12, 2021 at 07:46:32PM -0800, Florian Fainelli wrote:
>>> BCM54210E/BCM50212E has been verified to work correctly with the
>>> auto-power down configuration done by bcm54xx_adjust_rxrefclk(), add it
>>> to the list of PHYs working.
>>>
>>> While we are at it, provide an appropriate name for the bit we are
>>> changing which disables the RXC and TXC during auto-power down when
>>> there is no energy on the cable.
>>>
>>> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
>>> ---
>>
>> Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
>>
>>> drivers/net/phy/broadcom.c | 8 +++++---
>>> include/linux/brcmphy.h | 2 +-
>>> 2 files changed, 6 insertions(+), 4 deletions(-)
>>>
>>> diff --git a/drivers/net/phy/broadcom.c b/drivers/net/phy/broadcom.c
>>> index 3ce266ab521b..91fbd26c809e 100644
>>> --- a/drivers/net/phy/broadcom.c
>>> +++ b/drivers/net/phy/broadcom.c
>>> @@ -193,6 +193,7 @@ static void bcm54xx_adjust_rxrefclk(struct phy_device *phydev)
>>> if (BRCM_PHY_MODEL(phydev) != PHY_ID_BCM57780 &&
>>> BRCM_PHY_MODEL(phydev) != PHY_ID_BCM50610 &&
>>> BRCM_PHY_MODEL(phydev) != PHY_ID_BCM50610M &&
>>> + BRCM_PHY_MODEL(phydev) != PHY_ID_BCM54210E &&
>>> BRCM_PHY_MODEL(phydev) != PHY_ID_BCM54810 &&
>>> BRCM_PHY_MODEL(phydev) != PHY_ID_BCM54811)
>>> return;
>>> @@ -227,9 +228,10 @@ static void bcm54xx_adjust_rxrefclk(struct phy_device *phydev)
>>> val |= BCM54XX_SHD_SCR3_DLLAPD_DIS;
>>>
>>> if (phydev->dev_flags & PHY_BRCM_DIS_TXCRXC_NOENRGY) {
>>> - if (BRCM_PHY_MODEL(phydev) == PHY_ID_BCM54810 ||
>>> - BRCM_PHY_MODEL(phydev) == PHY_ID_BCM54811)
>>> - val |= BCM54810_SHD_SCR3_TRDDAPD;
>>> + if (BRCM_PHY_MODEL(phydev) == PHY_ID_BCM54210E ||
>>> + BRCM_PHY_MODEL(phydev) == PHY_ID_BCM54810 ||
>>> + BRCM_PHY_MODEL(phydev) == PHY_ID_BCM54210E)
>>> + val |= BCM54XX_SHD_SCR3_RXCTXC_DIS;
>>> else
>>> val |= BCM54XX_SHD_SCR3_TRDDAPD;
>>> }
>>> diff --git a/include/linux/brcmphy.h b/include/linux/brcmphy.h
>>> index 844dcfe789a2..16597d3fa011 100644
>>> --- a/include/linux/brcmphy.h
>>> +++ b/include/linux/brcmphy.h
>>> @@ -193,6 +193,7 @@
>>> #define BCM54XX_SHD_SCR3_DEF_CLK125 0x0001
>>> #define BCM54XX_SHD_SCR3_DLLAPD_DIS 0x0002
>>> #define BCM54XX_SHD_SCR3_TRDDAPD 0x0004
>>> +#define BCM54XX_SHD_SCR3_RXCTXC_DIS 0x0100
>>
>> Curiously enough, my BCM5464R datasheet does say:
>>
>> The TXC and RXC outputs can be disabled during auto-power down by setting the “1000BASE-T/100BASE-TX/10BASE-T
>> Spare Control 3 Register (Address 1Ch, Shadow Value 00101),” bit 8 =1.
>>
>> but when I go to the definition of the register, bit 8 is hidden. Odd.
>>
>> How can I ensure that the auto power down feature is doing something?
>
> I am trying to confirm what the expected power levels should be from the
> 54210E product engineer so I can give you an estimate of what you should
> see with and without while measure the PHY's regulators.

Took a while but for the 54210E reference board here are the numbers,
your mileage will vary depending on the supplies, regulator efficiency
and PCB design around the PHY obviously:

BMCR.PDOWN: 86.12 mW
auto-power down: 77.84 mW
auto-power-down, DLL disabled: 30.83 mW
IDDQ-low power: 9.85 mW (requires a RESETn toggle)
IDDQ with soft recovery: 10.75 mW

Interestingly, the 50212E that I am using requires writing the PDOWN bit
and only that bit (not a RMW) in order to get in a correct state, both
LEDs keep flashing when that happens, fixes coming.

When net-next opens back up I will submit patches to support IDDQ with
soft recovery since that is clearly much better than the standard power
down and it does not require a RESETn toggle.
--
Florian

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