net: dsa: seville: ignore mscc-miim read errors from Lynx PCS

[ Upstream commit c797867e12ddd89863c2c8dfe48a5bafe6875542 ]

During the refactoring in the commit below, vsc9953_mdio_read() was
replaced with mscc_miim_read(), which has one extra step: it checks for
the MSCC_MIIM_DATA_ERROR bits before returning the result.

On T1040RDB, there are 8 QSGMII PCSes belonging to the switch, and they
are organized in 2 groups. First group responds to MDIO addresses 4-7
because QSGMIIACR1[MDEV_PORT] is 1, and the second group responds to
MDIO addresses 8-11 because QSGMIIBCR1[MDEV_PORT] is 2. I have double
checked that these values are correctly set in the SERDES, as well as
PCCR1[QSGMA_CFG] and PCCR1[QSGMB_CFG] are both 0b01.

mscc_miim_read: phyad 8 reg 0x1 MIIM_DATA 0x2d
mscc_miim_read: phyad 8 reg 0x5 MIIM_DATA 0x5801
mscc_miim_read: phyad 8 reg 0x1 MIIM_DATA 0x2d
mscc_miim_read: phyad 8 reg 0x5 MIIM_DATA 0x5801
mscc_miim_read: phyad 9 reg 0x1 MIIM_DATA 0x2d
mscc_miim_read: phyad 9 reg 0x5 MIIM_DATA 0x5801
mscc_miim_read: phyad 9 reg 0x1 MIIM_DATA 0x2d
mscc_miim_read: phyad 9 reg 0x5 MIIM_DATA 0x5801
mscc_miim_read: phyad 10 reg 0x1 MIIM_DATA 0x2d
mscc_miim_read: phyad 10 reg 0x5 MIIM_DATA 0x5801
mscc_miim_read: phyad 10 reg 0x1 MIIM_DATA 0x2d
mscc_miim_read: phyad 10 reg 0x5 MIIM_DATA 0x5801
mscc_miim_read: phyad 11 reg 0x1 MIIM_DATA 0x2d
mscc_miim_read: phyad 11 reg 0x5 MIIM_DATA 0x5801
mscc_miim_read: phyad 11 reg 0x1 MIIM_DATA 0x2d
mscc_miim_read: phyad 11 reg 0x5 MIIM_DATA 0x5801
mscc_miim_read: phyad 4 reg 0x1 MIIM_DATA 0x3002d, ERROR
mscc_miim_read: phyad 4 reg 0x5 MIIM_DATA 0x3da01, ERROR
mscc_miim_read: phyad 5 reg 0x1 MIIM_DATA 0x3002d, ERROR
mscc_miim_read: phyad 5 reg 0x5 MIIM_DATA 0x35801, ERROR
mscc_miim_read: phyad 5 reg 0x1 MIIM_DATA 0x3002d, ERROR
mscc_miim_read: phyad 5 reg 0x5 MIIM_DATA 0x35801, ERROR
mscc_miim_read: phyad 6 reg 0x1 MIIM_DATA 0x3002d, ERROR
mscc_miim_read: phyad 6 reg 0x5 MIIM_DATA 0x35801, ERROR
mscc_miim_read: phyad 6 reg 0x1 MIIM_DATA 0x3002d, ERROR
mscc_miim_read: phyad 6 reg 0x5 MIIM_DATA 0x35801, ERROR
mscc_miim_read: phyad 7 reg 0x1 MIIM_DATA 0x3002d, ERROR
mscc_miim_read: phyad 7 reg 0x5 MIIM_DATA 0x35801, ERROR
mscc_miim_read: phyad 7 reg 0x1 MIIM_DATA 0x3002d, ERROR
mscc_miim_read: phyad 7 reg 0x5 MIIM_DATA 0x35801, ERROR

As can be seen, the data in MIIM_DATA is still valid despite having the
MSCC_MIIM_DATA_ERROR bits set. The driver as introduced in commit
a83ee1de50e3 ("net: dsa: felix: introduce support for Seville VSC9953
switch") was ignoring these bits, perhaps deliberately (although
unbeknownst to me).

This is an old IP and the hardware team cannot seem to be able to help
me track down a plausible reason for these failures. I'll keep
investigating, but in the meantime, this is a direct regression which
must be restored to a working state.

The only thing I can do is keep ignoring the errors as before.

Fixes: 071f16fa89f0 ("net: dsa: ocelot: felix: utilize shared mscc-miim driver for indirect MDIO access")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/dsa/ocelot/seville_vsc9953.c b/drivers/net/dsa/ocelot/seville_vsc9953.c
index 7af33b2c685dae0538550fbd2a78e5a67b6bb728..c2863d6d870fb7a42fd46a61982e5964cefbe315 100644 (file)
--- a/drivers/net/dsa/ocelot/seville_vsc9953.c
+++ b/drivers/net/dsa/ocelot/seville_vsc9953.c
@@ -923,8 +923,8 @@ static int vsc9953_mdio_bus_alloc(struct ocelot *ocelot)
 
        rc = mscc_miim_setup(dev, &bus, "VSC9953 internal MDIO bus",
                             ocelot->targets[GCB],
-                            ocelot->map[GCB][GCB_MIIM_MII_STATUS & REG_MASK]);
-
+                            ocelot->map[GCB][GCB_MIIM_MII_STATUS & REG_MASK],
+                            true);
        if (rc) {
                dev_err(dev, "failed to setup MDIO bus\n");
                return rc;

diff --git a/drivers/net/mdio/mdio-mscc-miim.c b/drivers/net/mdio/mdio-mscc-miim.c
index 51f68daac152f6936508240d9dcebe4ae05a069c..34b87389788bbf4651082731a08c05843a31e3b4 100644 (file)
--- a/drivers/net/mdio/mdio-mscc-miim.c
+++ b/drivers/net/mdio/mdio-mscc-miim.c
@@ -52,6 +52,7 @@ struct mscc_miim_info {
 struct mscc_miim_dev {
        struct regmap *regs;
        int mii_status_offset;
+       bool ignore_read_errors;
        struct regmap *phy_regs;
        const struct mscc_miim_info *info;
        struct clk *clk;
@@ -138,7 +139,7 @@ static int mscc_miim_read(struct mii_bus *bus, int mii_id, int regnum)
                goto out;
        }
 
-       if (val & MSCC_MIIM_DATA_ERROR) {
+       if (!miim->ignore_read_errors && !!(val & MSCC_MIIM_DATA_ERROR)) {
                ret = -EIO;
                goto out;
        }
@@ -218,7 +219,8 @@ static const struct regmap_config mscc_miim_phy_regmap_config = {
 };
 
 int mscc_miim_setup(struct device *dev, struct mii_bus **pbus, const char *name,
-                   struct regmap *mii_regmap, int status_offset)
+                   struct regmap *mii_regmap, int status_offset,
+                   bool ignore_read_errors)
 {
        struct mscc_miim_dev *miim;
        struct mii_bus *bus;
@@ -240,6 +242,7 @@ int mscc_miim_setup(struct device *dev, struct mii_bus **pbus, const char *name,
 
        miim->regs = mii_regmap;
        miim->mii_status_offset = status_offset;
+       miim->ignore_read_errors = ignore_read_errors;
 
        *pbus = bus;
 
@@ -291,7 +294,7 @@ static int mscc_miim_probe(struct platform_device *pdev)
                return dev_err_probe(dev, PTR_ERR(phy_regmap),
                                     "Unable to create phy register regmap\n");
 
-       ret = mscc_miim_setup(dev, &bus, "mscc_miim", mii_regmap, 0);
+       ret = mscc_miim_setup(dev, &bus, "mscc_miim", mii_regmap, 0, false);
        if (ret < 0) {
                dev_err(dev, "Unable to setup the MDIO bus\n");
                return ret;

diff --git a/include/linux/mdio/mdio-mscc-miim.h b/include/linux/mdio/mdio-mscc-miim.h
index 5b4ed2c3cbb9a6279fb8e51346e73efa14a27997..1ce699740af639bca3f3304d6a98aed8229cb97b 100644 (file)
--- a/include/linux/mdio/mdio-mscc-miim.h
+++ b/include/linux/mdio/mdio-mscc-miim.h
@@ -14,6 +14,6 @@
 
 int mscc_miim_setup(struct device *device, struct mii_bus **bus,
                    const char *name, struct regmap *mii_regmap,
-                   int status_offset);
+                   int status_offset, bool ignore_read_errors);
 
 #endif