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

On Sat, 3 Aug 2019 at 00:56, Tao Ren <taoren@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@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?

Regards,
-Vladimir

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