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From 6df6709dc3d00e0bc948d45dfa8d8f18ba379c48 Mon Sep 17 00:00:00 2001
From: Russell King <rmk+kernel@armlinux.org.uk>
Date: Tue, 5 Nov 2019 11:56:18 +0000
Subject: [PATCH 656/660] 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.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
---
drivers/net/phy/sfp.c | 44 +++++++++++++++++++++++++++++++++++++++----
1 file changed, 40 insertions(+), 4 deletions(-)
--- 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->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
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
}
}
+/* 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
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
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