diff options
| author | Russell King <rmk+kernel@armlinux.org.uk> | 2019-12-11 10:57:01 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-12-11 11:53:42 -0800 |
| commit | 9a484621e88ac8386f131596ce8d76668daf7996 (patch) | |
| tree | ad1d99c336007b0c4012fa52f8a64d34e8c66516 /drivers/net | |
| parent | 75f4d8d10e016f7428c268424483a927ee7a78bb (diff) | |
| download | linux-9a484621e88ac8386f131596ce8d76668daf7996.tar.bz2 | |
net: sfp: add support for Clause 45 PHYs
Some SFP+ modules have a Clause 45 PHY onboard, which is accessible via
the normal I2C address. Detect 10G BASE-T PHYs which may have an
accessible PHY and probe for it.
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/phy/sfp.c | 44 |
1 files changed, 40 insertions, 4 deletions
diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c index d7d2c797c89c..bfe268028154 100644 --- a/drivers/net/phy/sfp.c +++ b/drivers/net/phy/sfp.c @@ -1402,12 +1402,12 @@ static void sfp_sm_phy_detach(struct sfp *sfp) sfp->mod_phy = NULL; } -static void sfp_sm_probe_phy(struct sfp *sfp) +static void sfp_sm_probe_phy(struct sfp *sfp, bool is_c45) { struct phy_device *phy; int err; - phy = mdiobus_scan(sfp->i2c_mii, SFP_PHY_ADDR); + phy = get_phy_device(sfp->i2c_mii, SFP_PHY_ADDR, is_c45); if (phy == ERR_PTR(-ENODEV)) { dev_info(sfp->dev, "no PHY detected\n"); return; @@ -1417,6 +1417,13 @@ static void sfp_sm_probe_phy(struct sfp *sfp) return; } + err = phy_device_register(phy); + if (err) { + phy_device_free(phy); + dev_err(sfp->dev, "phy_device_register failed: %d\n", err); + return; + } + err = sfp_add_phy(sfp->sfp_bus, phy); if (err) { phy_device_remove(phy); @@ -1487,10 +1494,32 @@ static void sfp_sm_fault(struct sfp *sfp, unsigned int next_state, bool warn) } } +/* Probe a SFP for a PHY device if the module supports copper - the PHY + * normally sits at I2C bus address 0x56, and may either be a clause 22 + * or clause 45 PHY. + * + * Clause 22 copper SFP modules normally operate in Cisco SGMII mode with + * negotiation enabled, but some may be in 1000base-X - which is for the + * PHY driver to determine. + * + * Clause 45 copper SFP+ modules (10G) appear to switch their interface + * mode according to the negotiated line speed. + */ static void sfp_sm_probe_for_phy(struct sfp *sfp) { - if (sfp->id.base.e1000_base_t) - sfp_sm_probe_phy(sfp); + switch (sfp->id.base.extended_cc) { + case SFF8024_ECC_10GBASE_T_SFI: + case SFF8024_ECC_10GBASE_T_SR: + case SFF8024_ECC_5GBASE_T: + case SFF8024_ECC_2_5GBASE_T: + sfp_sm_probe_phy(sfp, true); + break; + + default: + if (sfp->id.base.e1000_base_t) + sfp_sm_probe_phy(sfp, false); + break; + } } static int sfp_module_parse_power(struct sfp *sfp) @@ -1550,6 +1579,13 @@ static int sfp_sm_mod_hpower(struct sfp *sfp, bool enable) return -EAGAIN; } + /* DM7052 reports as a high power module, responds to reads (with + * all bytes 0xff) at 0x51 but does not accept writes. In any case, + * if the bit is already set, we're already in high power mode. + */ + if (!!(val & BIT(0)) == enable) + return 0; + if (enable) val |= BIT(0); else |