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net: sfp: add support for Clause 45 PHYs

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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>
This commit is contained in:
Russell King 2019-12-11 10:57:01 +00:00 committed by David S. Miller
parent 75f4d8d10e
commit 9a484621e8
1 changed files with 40 additions and 4 deletions
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44
drivers/net/phy/sfp.c
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@ -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