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net: sfp: rework the RollBall PHY waiting code

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RollBall SFP modules allow the access to PHY registers only after a
certain time has passed. Until then, the registers read 0xffff.

Currently we have quirks for modules where we need to wait either 25
seconds or 4 seconds, but recently I got hands on another module where
the wait is even shorter.

Instead of hardcoding different wait times, lets rework the code:
- increase the PHY retry count to 25
- when RollBall module is detected, increase the PHY retry time from
  50ms to 1s

Signed-off-by: Marek Behún <kabel@kernel.org>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Marek Behún 2023-11-21 18:20:24 +01:00 committed by David S. Miller
parent 53775da0b4
commit 2f3ce7a56c
1 changed files with 21 additions and 20 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

41
drivers/net/phy/sfp.c
View file

@ -191,7 +191,7 @@ static const enum gpiod_flags gpio_flags[] = {
* R_PHY_RETRY is the number of attempts.
*/
#define T_PHY_RETRY msecs_to_jiffies(50)
#define R_PHY_RETRY 12
#define R_PHY_RETRY 25
/* SFP module presence detection is poor: the three MOD DEF signals are
* the same length on the PCB, which means it's possible for MOD DEF 0 to
@ -274,7 +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;
unsigned int rs_threshold_kbd;
@ -372,18 +372,22 @@ static void sfp_fixup_10gbaset_30m(struct sfp *sfp)
sfp->id.base.extended_cc = SFF8024_ECC_10GBASE_T_SR;
}
static void sfp_fixup_rollball_proto(struct sfp *sfp, unsigned int secs)
static void sfp_fixup_rollball(struct sfp *sfp)
{
sfp->mdio_protocol = MDIO_I2C_ROLLBALL;
sfp->module_t_wait = msecs_to_jiffies(secs * 1000);
/* RollBall modules may disallow access to PHY registers for up to 25
* seconds, and the reads return 0xffff before that. Increase the time
* between PHY probe retries from 50ms to 1s so that we will wait for
* the PHY for a sufficient amount of time.
*/
sfp->phy_t_retry = msecs_to_jiffies(1000);
}
static void sfp_fixup_fs_10gt(struct sfp *sfp)
{
sfp_fixup_10gbaset_30m(sfp);
// These SFPs need 4 seconds before the PHY can be accessed
sfp_fixup_rollball_proto(sfp, 4);
sfp_fixup_rollball(sfp);
}
static void sfp_fixup_halny_gsfp(struct sfp *sfp)
@ -395,12 +399,6 @@ static void sfp_fixup_halny_gsfp(struct sfp *sfp)
sfp->state_hw_mask &= ~(SFP_F_TX_FAULT | SFP_F_LOS);
}
static void sfp_fixup_rollball(struct sfp *sfp)
{
// Rollball SFPs need 25 seconds before the PHY can be accessed
sfp_fixup_rollball_proto(sfp, 25);
}
static void sfp_fixup_rollball_cc(struct sfp *sfp)
{
sfp_fixup_rollball(sfp);
@ -2331,7 +2329,7 @@ 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;
@ -2568,10 +2566,9 @@ 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 (or more on
* specific modules).
* anything (such as probe for a PHY) is 50ms.
*/
sfp_sm_next(sfp, SFP_S_WAIT, sfp->module_t_wait);
sfp_sm_next(sfp, SFP_S_WAIT, T_WAIT);
break;
case SFP_S_WAIT:
@ -2585,8 +2582,8 @@ static void sfp_sm_main(struct sfp *sfp, unsigned int event)
* deasserting.
*/
timeout = sfp->module_t_start_up;
if (timeout > sfp->module_t_wait)
timeout -= sfp->module_t_wait;
if (timeout > T_WAIT)
timeout -= T_WAIT;
else
timeout = 1;
@ -2629,7 +2626,11 @@ static void sfp_sm_main(struct sfp *sfp, unsigned int event)
ret = sfp_sm_probe_for_phy(sfp);
if (ret == -ENODEV) {
if (--sfp->sm_phy_retries) {
sfp_sm_next(sfp, SFP_S_INIT_PHY, T_PHY_RETRY);
sfp_sm_next(sfp, SFP_S_INIT_PHY,
sfp->phy_t_retry);
dev_dbg(sfp->dev,
"no PHY detected, %u tries left\n",
sfp->sm_phy_retries);
break;
} else {
dev_info(sfp->dev, "no PHY detected\n");