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net: sfp: VSOL V2801F / CarlitoxxPro CPGOS03-0490 v2.0 workaround

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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 <tschreibe@gmail.com>
Reported-by: Pali Rohár <pali@kernel.org>
Tested-by: Pali Rohár <pali@kernel.org>
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 2020-12-09 11:22:49 +00:00 committed by David S. Miller
parent 6b21c0bb3a
commit 0d035bed2a
1 changed files with 58 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

63
drivers/net/phy/sfp.c
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@ -219,6 +219,7 @@ 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 *);
@ -335,10 +336,19 @@ static int sfp_i2c_read(struct sfp *sfp, bool a2, u8 dev_addr, void *buf,
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;
@ -350,8 +360,8 @@ static int sfp_i2c_read(struct sfp *sfp, bool a2, u8 dev_addr, void *buf,
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;
@ -1632,6 +1642,28 @@ static int sfp_sm_mod_hpower(struct sfp *sfp, bool enable)
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_cotsworks_fixup_check(struct sfp *sfp, struct sfp_eeprom_id *id)
{
u8 check;
@ -1673,14 +1705,20 @@ static int sfp_sm_mod_probe(struct sfp *sfp, bool report)
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;
}
@ -1719,6 +1757,21 @@ static int sfp_sm_mod_probe(struct sfp *sfp, bool report)
}
}
/* 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) {