On 2/12/2021 5:11 PM, Vladimir Oltean wrote:
> On Fri, Feb 12, 2021 at 12:57:20PM -0800, Florian Fainelli wrote:
>> When support for optionally disabling the TXC was introduced, bit 2 was
>> used to do that operation but the datasheet for 50610M from 2009 does
>> not show bit 2 as being defined. Bit 8 is the one that allows automatic
>> disabling of the RXC/TXC auto disabling during auto power down.
>>
>> Fixes: 52fae0837153 ("tg3 / broadcom: Optionally disable TXC if no link")
>> Signed-off-by: Florian Fainelli <f.faine...@gmail.com>
>> ---
>> include/linux/brcmphy.h | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/include/linux/brcmphy.h b/include/linux/brcmphy.h
>> index da7bf9dfef5b..3dd8203cf780 100644
>> --- a/include/linux/brcmphy.h
>> +++ b/include/linux/brcmphy.h
>> @@ -193,7 +193,7 @@
>> #define BCM54XX_SHD_SCR3 0x05
>> #define BCM54XX_SHD_SCR3_DEF_CLK125 0x0001
>> #define BCM54XX_SHD_SCR3_DLLAPD_DIS 0x0002
>> -#define BCM54XX_SHD_SCR3_TRDDAPD 0x0004
>> +#define BCM54XX_SHD_SCR3_TRDDAPD 0x0100
>>
>> /* 01010: Auto Power-Down */
>> #define BCM54XX_SHD_APD 0x0a
>> --
>> 2.25.1
>>
>
> We may have a problem here, with the layout of the Spare Control 3
> register not being as universal as we think.
>
> Your finding may have been the same as Kevin Lo's from commit
> b0ed0bbfb304 ("net: phy: broadcom: add support for BCM54811 PHY"),
> therefore your change is making BCM54XX_SHD_SCR3_TRDDAPD ==
> BCM54810_SHD_SCR3_TRDDAPD, so currently this if condition is redundant
> and probably something else is wrong too:
>
> 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;
> else
> val |= BCM54XX_SHD_SCR3_TRDDAPD;
> }
>
> I'm not sure what "TRDD" stands for, but my copy of the BCM5464R
> datasheet shows both bits 2 as well as 8 as being reserved. I have
> "CLK125 Output" in bit 0, "DLL Auto Power-Down" in bit 1, "SD/Energy
> Detect Change" in bit 5, "TXC Disable" in bit 6, and that's about it.
Let me go back to the datasheet of all of the PHYs supported by
bcm54xx_adjust_rxrefclk() and make sure we set the right bit.
I also have no idea what TRDD stands for.
>
> But I think it doesn't matter what BCM5464R has, since this feature is
> gated by PHY_BRCM_DIS_TXCRXC_NOENRGY.
Yes, but it should be working nonetheless.
--
Florian
