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net: phy: sfp: Cotsworks SFF module EEPROM fixup 

Some Cotsworks SFF have invalid data in the first few bytes of the
module EEPROM.  This results in these modules not being detected as
valid modules.

Address this by poking the correct EEPROM values into the module
EEPROM when the model/PN match and the existing module EEPROM contents
are not correct.

Signed-off-by: Chris Healy <cphealy@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Chris Healy 2020-07-14 10:59:10 -07:00 committed by David S. Miller
parent bba238ed03
commit b18432c5a4
1 changed files with 44 additions and 0 deletions
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44
drivers/net/phy/sfp.c
View File

@ -1632,10 +1632,43 @@ static int sfp_sm_mod_hpower(struct sfp *sfp, bool enable)
return 0;
}
static int sfp_cotsworks_fixup_check(struct sfp *sfp, struct sfp_eeprom_id *id)
{
u8 check;
int err;
if (id->base.phys_id != SFF8024_ID_SFF_8472 ||
id->base.phys_ext_id != SFP_PHYS_EXT_ID_SFP ||
id->base.connector != SFF8024_CONNECTOR_LC) {
dev_warn(sfp->dev, "Rewriting fiber module EEPROM with corrected values\n");
id->base.phys_id = SFF8024_ID_SFF_8472;
id->base.phys_ext_id = SFP_PHYS_EXT_ID_SFP;
id->base.connector = SFF8024_CONNECTOR_LC;
err = sfp_write(sfp, false, SFP_PHYS_ID, &id->base, 3);
if (err != 3) {
dev_err(sfp->dev, "Failed to rewrite module EEPROM: %d\n", err);
return err;
}
/* Cotsworks modules have been found to require a delay between write operations. */
mdelay(50);
/* Update base structure checksum */
check = sfp_check(&id->base, sizeof(id->base) - 1);
err = sfp_write(sfp, false, SFP_CC_BASE, &check, 1);
if (err != 1) {
dev_err(sfp->dev, "Failed to update base structure checksum in fiber module EEPROM: %d\n", err);
return err;
}
}
return 0;
}
static int sfp_sm_mod_probe(struct sfp *sfp, bool report)
{
/* SFP module inserted - read I2C data */
struct sfp_eeprom_id id;
bool cotsworks_sfbg;
bool cotsworks;
u8 check;
int ret;
@ -1657,6 +1690,17 @@ static int sfp_sm_mod_probe(struct sfp *sfp, bool report)
* serial number and date code.
*/
cotsworks = !memcmp(id.base.vendor_name, "COTSWORKS ", 16);
cotsworks_sfbg = !memcmp(id.base.vendor_pn, "SFBG", 4);
/* Cotsworks SFF module EEPROM do not always have valid phys_id,
* phys_ext_id, and connector bytes. Rewrite SFF EEPROM bytes if
* Cotsworks PN matches and bytes are not correct.
*/
if (cotsworks && cotsworks_sfbg) {
ret = sfp_cotsworks_fixup_check(sfp, &id);
if (ret < 0)
return ret;
}
/* Validate the checksum over the base structure */
check = sfp_check(&id.base, sizeof(id.base) - 1);