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Message-ID: <78b23ab0-f05b-49e4-8ca5-60b16a1cb8ea@quicinc.com>
Date: Wed, 20 Dec 2023 16:30:08 +0800
From: Lei Wei <quic_leiwei@...cinc.com>
To: Marek Behún <kabel@...nel.org>, <netdev@...r.kernel.org>,
Russell King <rmk+kernel@...linux.org.uk>
CC: Jakub Kicinski <kuba@...nel.org>, Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH net-next] net: sfp: fix PHY discovery for FS SFP-10G-T
module
On 12/20/2023 12:24 AM, Marek Behún wrote:
> Commit 2f3ce7a56c6e ("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: 2f3ce7a56c6e ("net: sfp: rework the RollBall PHY waiting code")
> Reported-by: Wei Lei <quic_leiwei@...cinc.com>
> Signed-off-by: Marek Behún <kabel@...nel.org>
Tested-by: Lei Wei <quic_leiwei@...cinc.com>
Regards,
Lei Wei
> ---
> Lei, could you please test this and send a Tested-by tag?
Marek, verified it is working, thank you for the fix.
> ---
> drivers/net/phy/sfp.c | 17 +++++++++++++----
> 1 file changed, 13 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
> index 3780a96d2caa..f75c9eb3958e 100644
> --- a/drivers/net/phy/sfp.c
> +++ b/drivers/net/phy/sfp.c
> @@ -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;
>
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