From 0d035bed2a4a6c4878518749348be61bf082d12a Mon Sep 17 00:00:00 2001 From: Russell King Date: Wed, 9 Dec 2020 11:22:49 +0000 Subject: [PATCH] net: sfp: VSOL V2801F / CarlitoxxPro CPGOS03-0490 v2.0 workaround MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add a workaround for the detection of VSOL V2801F / CarlitoxxPro CPGOS03-0490 v2.0 GPON module which CarlitoxxPro states needs single byte I2C reads to the EEPROM. Pali Rohár reports that he also has a CarlitoxxPro-based V2801F module, which reports a manufacturer of "OEM". This manufacturer can't be matched as it appears in many different modules, so also match the part number too. Reported-by: Thomas Schreiber Reported-by: Pali Rohár Tested-by: Pali Rohár Reviewed-by: Andrew Lunn Signed-off-by: Russell King Signed-off-by: David S. Miller --- drivers/net/phy/sfp.c | 63 +++++++++++++++++++++++++++++++++++++++---- 1 file changed, 58 insertions(+), 5 deletions(-) --- a/drivers/net/phy/sfp.c +++ b/drivers/net/phy/sfp.c @@ -191,6 +191,7 @@ struct sfp { struct sfp_bus *sfp_bus; struct phy_device *mod_phy; const struct sff_data *type; + size_t i2c_block_size; u32 max_power_mW; unsigned int (*get_state)(struct sfp *); @@ -305,10 +306,19 @@ static int sfp_i2c_read(struct sfp *sfp, size_t len) { struct i2c_msg msgs[2]; - u8 bus_addr = a2 ? 0x51 : 0x50; + size_t block_size; size_t this_len; + u8 bus_addr; int ret; + if (a2) { + block_size = 16; + bus_addr = 0x51; + } else { + block_size = sfp->i2c_block_size; + bus_addr = 0x50; + } + msgs[0].addr = bus_addr; msgs[0].flags = 0; msgs[0].len = 1; @@ -320,8 +330,8 @@ static int sfp_i2c_read(struct sfp *sfp, while (len) { this_len = len; - if (this_len > 16) - this_len = 16; + if (this_len > block_size) + this_len = block_size; msgs[1].len = this_len; @@ -1577,6 +1587,28 @@ static int sfp_sm_mod_hpower(struct sfp return 0; } +/* Some modules (Nokia 3FE46541AA) lock up if byte 0x51 is read as a + * single read. Switch back to reading 16 byte blocks unless we have + * a CarlitoxxPro module (rebranded VSOL V2801F). Even more annoyingly, + * some VSOL V2801F have the vendor name changed to OEM. + */ +static int sfp_quirk_i2c_block_size(const struct sfp_eeprom_base *base) +{ + if (!memcmp(base->vendor_name, "VSOL ", 16)) + return 1; + if (!memcmp(base->vendor_name, "OEM ", 16) && + !memcmp(base->vendor_pn, "V2801F ", 16)) + return 1; + + /* Some modules can't cope with long reads */ + return 16; +} + +static void sfp_quirks_base(struct sfp *sfp, const struct sfp_eeprom_base *base) +{ + sfp->i2c_block_size = sfp_quirk_i2c_block_size(base); +} + static int sfp_sm_mod_probe(struct sfp *sfp, bool report) { /* SFP module inserted - read I2C data */ @@ -1585,14 +1617,20 @@ static int sfp_sm_mod_probe(struct sfp * u8 check; int ret; - ret = sfp_read(sfp, false, 0, &id, sizeof(id)); + /* Some modules (CarlitoxxPro CPGOS03-0490) do not support multibyte + * reads from the EEPROM, so start by reading the base identifying + * information one byte at a time. + */ + sfp->i2c_block_size = 1; + + ret = sfp_read(sfp, false, 0, &id.base, sizeof(id.base)); if (ret < 0) { if (report) dev_err(sfp->dev, "failed to read EEPROM: %d\n", ret); return -EAGAIN; } - if (ret != sizeof(id)) { + if (ret != sizeof(id.base)) { dev_err(sfp->dev, "EEPROM short read: %d\n", ret); return -EAGAIN; } @@ -1620,6 +1658,21 @@ static int sfp_sm_mod_probe(struct sfp * } } + /* Apply any early module-specific quirks */ + sfp_quirks_base(sfp, &id.base); + + ret = sfp_read(sfp, false, SFP_CC_BASE + 1, &id.ext, sizeof(id.ext)); + if (ret < 0) { + if (report) + dev_err(sfp->dev, "failed to read EEPROM: %d\n", ret); + return -EAGAIN; + } + + if (ret != sizeof(id.ext)) { + dev_err(sfp->dev, "EEPROM short read: %d\n", ret); + return -EAGAIN; + } + check = sfp_check(&id.ext, sizeof(id.ext) - 1); if (check != id.ext.cc_ext) { if (cotsworks) {