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net: sfp: fix PHY discovery for FS SFP-10G-T module

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Commit 2f3ce7a56c ("net: sfp: rework the RollBall PHY waiting code")
changed the long wait before accessing RollBall / FS modules into
probing for PHY every 1 second, and trying 25 times.

Wei Lei reports that this does not work correctly on FS modules: when
initializing, they may report values different from 0xffff in PHY ID
registers for some MMDs, causing get_phy_c45_ids() to find some bogus
MMD.

Fix this by adding the module_t_wait member back, and setting it to 4
seconds for FS modules.

Fixes: 2f3ce7a56c ("net: sfp: rework the RollBall PHY waiting code")
Reported-by: Wei Lei <quic_leiwei@quicinc.com>
Signed-off-by: Marek Behún <kabel@kernel.org>
Tested-by: Lei Wei <quic_leiwei@quicinc.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Marek Behún 2023-12-19 17:24:15 +01:00 committed by David S. Miller
parent 3b83fa94cf
commit e9301af385
1 changed files with 13 additions and 4 deletions
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17
drivers/net/phy/sfp.c
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@ -274,6 +274,7 @@ struct sfp {
struct sfp_eeprom_id id;
unsigned int module_power_mW;
unsigned int module_t_start_up;
unsigned int module_t_wait;
unsigned int phy_t_retry;
unsigned int rate_kbd;
@ -388,6 +389,12 @@ static void sfp_fixup_fs_10gt(struct sfp *sfp)
{
sfp_fixup_10gbaset_30m(sfp);
sfp_fixup_rollball(sfp);
/* The RollBall fixup is not enough for FS modules, the AQR chip inside
* them does not return 0xffff for PHY ID registers in all MMDs for the
* while initializing. They need a 4 second wait before accessing PHY.
*/
sfp->module_t_wait = msecs_to_jiffies(4000);
}
static void sfp_fixup_halny_gsfp(struct sfp *sfp)
@ -2329,6 +2336,7 @@ static int sfp_sm_mod_probe(struct sfp *sfp, bool report)
mask |= SFP_F_RS1;
sfp->module_t_start_up = T_START_UP;
sfp->module_t_wait = T_WAIT;
sfp->phy_t_retry = T_PHY_RETRY;
sfp->state_ignore_mask = 0;
@ -2566,9 +2574,10 @@ static void sfp_sm_main(struct sfp *sfp, unsigned int event)
/* We need to check the TX_FAULT state, which is not defined
* while TX_DISABLE is asserted. The earliest we want to do
* anything (such as probe for a PHY) is 50ms.
* anything (such as probe for a PHY) is 50ms (or more on
* specific modules).
*/
sfp_sm_next(sfp, SFP_S_WAIT, T_WAIT);
sfp_sm_next(sfp, SFP_S_WAIT, sfp->module_t_wait);
break;
case SFP_S_WAIT:
@ -2582,8 +2591,8 @@ static void sfp_sm_main(struct sfp *sfp, unsigned int event)
* deasserting.
*/
timeout = sfp->module_t_start_up;
if (timeout > T_WAIT)
timeout -= T_WAIT;
if (timeout > sfp->module_t_wait)
timeout -= sfp->module_t_wait;
else
timeout = 1;