[PATCH net-next v3] net: phy: broadcom: add 1000Base-X support for BCM54616S

Tao Ren taoren at fb.com
Sun Aug 4 14:48:27 AEST 2019


Hi Vladimir,

On 8/3/19 6:49 AM, Vladimir Oltean wrote:
> Hi Tao,
> 
> On Sat, 3 Aug 2019 at 00:56, Tao Ren <taoren at fb.com> wrote:
>>
>> genphy_read_status() cannot report correct link speed when BCM54616S PHY
>> is configured in RGMII->1000Base-KX mode (for example, on Facebook CMM
>> BMC platform), and it is because speed-related fields in MII registers
>> are assigned different meanings in 1000X register set. Actually there
>> is no speed field in 1000X register set because link speed is always
>> 1000 Mb/s.
>>
>> The patch adds "probe" callback to detect PHY's operation mode based on
>> INTERF_SEL[1:0] pins and 1000X/100FX selection bit in SerDES 100-FX
>> Control register. Besides, link speed is manually set to 1000 Mb/s in
>> "read_status" callback if PHY-switch link is 1000Base-X.
>>
>> Signed-off-by: Tao Ren <taoren at fb.com>
>> ---
>>  Changes in v3:
>>   - rename bcm5482_read_status to bcm54xx_read_status so the callback can
>>     be shared by BCM5482 and BCM54616S.
>>  Changes in v2:
>>   - Auto-detect PHY operation mode instead of passing DT node.
>>   - move PHY mode auto-detect logic from config_init to probe callback.
>>   - only set speed (not including duplex) in read_status callback.
>>   - update patch description with more background to avoid confusion.
>>   - patch #1 in the series ("net: phy: broadcom: set features explicitly
>>     for BCM54616") is dropped: the fix should go to get_features callback
>>     which may potentially depend on this patch.
>>
>>  drivers/net/phy/broadcom.c | 41 +++++++++++++++++++++++++++++++++-----
>>  include/linux/brcmphy.h    | 10 ++++++++--
>>  2 files changed, 44 insertions(+), 7 deletions(-)
>>
>> diff --git a/drivers/net/phy/broadcom.c b/drivers/net/phy/broadcom.c
>> index 937d0059e8ac..ecad8a201a09 100644
>> --- a/drivers/net/phy/broadcom.c
>> +++ b/drivers/net/phy/broadcom.c
>> @@ -383,9 +383,9 @@ static int bcm5482_config_init(struct phy_device *phydev)
>>                 /*
>>                  * Select 1000BASE-X register set (primary SerDes)
>>                  */
>> -               reg = bcm_phy_read_shadow(phydev, BCM5482_SHD_MODE);
>> -               bcm_phy_write_shadow(phydev, BCM5482_SHD_MODE,
>> -                                    reg | BCM5482_SHD_MODE_1000BX);
>> +               reg = bcm_phy_read_shadow(phydev, BCM54XX_SHD_MODE);
>> +               bcm_phy_write_shadow(phydev, BCM54XX_SHD_MODE,
>> +                                    reg | BCM54XX_SHD_MODE_1000BX);
>>
>>                 /*
>>                  * LED1=ACTIVITYLED, LED3=LINKSPD[2]
>> @@ -409,7 +409,7 @@ static int bcm5482_config_init(struct phy_device *phydev)
>>         return err;
>>  }
>>
>> -static int bcm5482_read_status(struct phy_device *phydev)
>> +static int bcm54xx_read_status(struct phy_device *phydev)
>>  {
>>         int err;
>>
>> @@ -464,6 +464,35 @@ static int bcm54616s_config_aneg(struct phy_device *phydev)
>>         return ret;
>>  }
>>
>> +static int bcm54616s_probe(struct phy_device *phydev)
>> +{
>> +       int val, intf_sel;
>> +
>> +       val = bcm_phy_read_shadow(phydev, BCM54XX_SHD_MODE);
>> +       if (val < 0)
>> +               return val;
>> +
>> +       /* The PHY is strapped in RGMII to fiber mode when INTERF_SEL[1:0]
>> +        * is 01b.
>> +        */
>> +       intf_sel = (val & BCM54XX_SHD_INTF_SEL_MASK) >> 1;
>> +       if (intf_sel == 1) {
>> +               val = bcm_phy_read_shadow(phydev, BCM54616S_SHD_100FX_CTRL);
>> +               if (val < 0)
>> +                       return val;
>> +
>> +               /* Bit 0 of the SerDes 100-FX Control register, when set
>> +                * to 1, sets the MII/RGMII -> 100BASE-FX configuration.
>> +                * When this bit is set to 0, it sets the GMII/RGMII ->
>> +                * 1000BASE-X configuration.
>> +                */
>> +               if (!(val & BCM54616S_100FX_MODE))
>> +                       phydev->dev_flags |= PHY_BCM_FLAGS_MODE_1000BX;
>> +       }
>> +
>> +       return 0;
>> +}
>> +
>>  static int brcm_phy_setbits(struct phy_device *phydev, int reg, int set)
>>  {
>>         int val;
>> @@ -655,6 +684,8 @@ static struct phy_driver broadcom_drivers[] = {
>>         .config_aneg    = bcm54616s_config_aneg,
>>         .ack_interrupt  = bcm_phy_ack_intr,
>>         .config_intr    = bcm_phy_config_intr,
>> +       .read_status    = bcm54xx_read_status,
>> +       .probe          = bcm54616s_probe,
>>  }, {
>>         .phy_id         = PHY_ID_BCM5464,
>>         .phy_id_mask    = 0xfffffff0,
>> @@ -689,7 +720,7 @@ static struct phy_driver broadcom_drivers[] = {
>>         .name           = "Broadcom BCM5482",
>>         /* PHY_GBIT_FEATURES */
>>         .config_init    = bcm5482_config_init,
>> -       .read_status    = bcm5482_read_status,
>> +       .read_status    = bcm54xx_read_status,
>>         .ack_interrupt  = bcm_phy_ack_intr,
>>         .config_intr    = bcm_phy_config_intr,
>>  }, {
>> diff --git a/include/linux/brcmphy.h b/include/linux/brcmphy.h
>> index 6db2d9a6e503..b475e7f20d28 100644
>> --- a/include/linux/brcmphy.h
>> +++ b/include/linux/brcmphy.h
>> @@ -200,9 +200,15 @@
>>  #define BCM5482_SHD_SSD                0x14    /* 10100: Secondary SerDes control */
>>  #define BCM5482_SHD_SSD_LEDM   0x0008  /* SSD LED Mode enable */
>>  #define BCM5482_SHD_SSD_EN     0x0001  /* SSD enable */
>> -#define BCM5482_SHD_MODE       0x1f    /* 11111: Mode Control Register */
>> -#define BCM5482_SHD_MODE_1000BX        0x0001  /* Enable 1000BASE-X registers */
>>
>> +/* 10011: SerDes 100-FX Control Register */
>> +#define BCM54616S_SHD_100FX_CTRL       0x13
>> +#define        BCM54616S_100FX_MODE            BIT(0)  /* 100-FX SerDes Enable */
>> +
>> +/* 11111: Mode Control Register */
>> +#define BCM54XX_SHD_MODE               0x1f
>> +#define BCM54XX_SHD_INTF_SEL_MASK      GENMASK(2, 1)   /* INTERF_SEL[1:0] */
>> +#define BCM54XX_SHD_MODE_1000BX                BIT(0)  /* Enable 1000-X registers */
>>
>>  /*
>>   * EXPANSION SHADOW ACCESS REGISTERS.  (PHY REG 0x15, 0x16, and 0x17)
>> --
>> 2.17.1
>>
> 
> The patchset looks better now. But is it ok, I wonder, to keep
> PHY_BCM_FLAGS_MODE_1000BX in phydev->dev_flags, considering that
> phy_attach_direct is overwriting it?

I checked ftgmac100 driver (used on my machine) and it calls phy_connect_direct which passes phydev->dev_flags when calling phy_attach_direct: that explains why the flag is not cleared in my case.

Can you give me some suggestions since dev_flags may be override in other calling paths? For example, is it good idea to move the auto-detect logic from probe to config_init? Or are there other fields in phy_device structure that can be used to store PHY-switch link type? Or maybe I should just include the auto-detect logic in read_status callback?


Thanks,

Tao


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