[PATCH net v2] net: phy: aquantia: only poll GLOBAL_CFG regs on aqr113, aqr113c and aqr115c

[PATCH net v2] net: phy: aquantia: only poll GLOBAL_CFG regs on aqr113, aqr113c and aqr115c

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Commit 708405f3e56e ("net: phy: aquantia: wait for the GLOBAL_CFG to
start returning real values") introduced a workaround for an issue
observed on aqr115c. However there were never any reports of it
happening on other models and the workaround has been reported to cause
and issue on aqr113c (and it may cause the same on any other model not
supporting 10M mode).

Let's limit the impact of the workaround to aqr113, aqr113c and aqr115c
and poll the 100M GLOBAL_CFG register instead as both models are known
to support it correctly.

Reported-by: Jon Hunter <jonathanh@nvidia.com>
Closes: https://lore.kernel.org/lkml/7c0140be-4325-4005-9068-7e0fc5ff344d@nvidia.com/
Fixes: 708405f3e56e ("net: phy: aquantia: wait for the GLOBAL_CFG to start returning real values")
Tested-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
---
v1 -> v2:
- update the commit message to mention aqr113 too
- fix the comment in the source file: 10M -> 100M

 drivers/net/phy/aquantia/aquantia_main.c | 29 +++++++++++++++++-------
 1 file changed, 21 insertions(+), 8 deletions(-)

diff --git a/drivers/net/phy/aquantia/aquantia_main.c b/drivers/net/phy/aquantia/aquantia_main.c
index d12e35374231..e982e9ce44a5 100644
--- a/drivers/net/phy/aquantia/aquantia_main.c
+++ b/drivers/net/phy/aquantia/aquantia_main.c
@@ -653,13 +653,7 @@ static int aqr107_fill_interface_modes(struct phy_device *phydev)
 	unsigned long *possible = phydev->possible_interfaces;
 	unsigned int serdes_mode, rate_adapt;
 	phy_interface_t interface;
-	int i, val, ret;
-
-	ret = phy_read_mmd_poll_timeout(phydev, MDIO_MMD_VEND1,
-					VEND1_GLOBAL_CFG_10M, val, val != 0,
-					1000, 100000, false);
-	if (ret)
-		return ret;
+	int i, val;
 
 	/* Walk the media-speed configuration registers to determine which
 	 * host-side serdes modes may be used by the PHY depending on the
@@ -708,6 +702,25 @@ static int aqr107_fill_interface_modes(struct phy_device *phydev)
 	return 0;
 }
 
+static int aqr113c_fill_interface_modes(struct phy_device *phydev)
+{
+	int val, ret;
+
+	/* It's been observed on some models that - when coming out of suspend
+	 * - the FW signals that the PHY is ready but the GLOBAL_CFG registers
+	 * continue on returning zeroes for some time. Let's poll the 100M
+	 * register until it returns a real value as both 113c and 115c support
+	 * this mode.
+	 */
+	ret = phy_read_mmd_poll_timeout(phydev, MDIO_MMD_VEND1,
+					VEND1_GLOBAL_CFG_100M, val, val != 0,
+					1000, 100000, false);
+	if (ret)
+		return ret;
+
+	return aqr107_fill_interface_modes(phydev);
+}
+
 static int aqr113c_config_init(struct phy_device *phydev)
 {
 	int ret;
@@ -725,7 +738,7 @@ static int aqr113c_config_init(struct phy_device *phydev)
 	if (ret)
 		return ret;
 
-	return aqr107_fill_interface_modes(phydev);
+	return aqr113c_fill_interface_modes(phydev);
 }
 
 static int aqr107_probe(struct phy_device *phydev)
-- 
2.43.0

Re: [PATCH net v2] net: phy: aquantia: only poll GLOBAL_CFG regs on aqr113, aqr113c and aqr115c

[Antoine Tenart]

Quoting Bartosz Golaszewski (2024-07-29 17:03:14)
> From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
> 
> Commit 708405f3e56e ("net: phy: aquantia: wait for the GLOBAL_CFG to
> start returning real values") introduced a workaround for an issue
> observed on aqr115c. However there were never any reports of it
> happening on other models and the workaround has been reported to cause
> and issue on aqr113c (and it may cause the same on any other model not
> supporting 10M mode).
> 
> Let's limit the impact of the workaround to aqr113, aqr113c and aqr115c
> and poll the 100M GLOBAL_CFG register instead as both models are known
> to support it correctly.
> 
> Reported-by: Jon Hunter <jonathanh@nvidia.com>
> Closes: https://lore.kernel.org/lkml/7c0140be-4325-4005-9068-7e0fc5ff344d@nvidia.com/
> Fixes: 708405f3e56e ("net: phy: aquantia: wait for the GLOBAL_CFG to start returning real values")
> Tested-by: Jon Hunter <jonathanh@nvidia.com>
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Reviewed-by: Antoine Tenart <atenart@kernel.org>

Thanks!

> ---
> v1 -> v2:
> - update the commit message to mention aqr113 too
> - fix the comment in the source file: 10M -> 100M
> 
>  drivers/net/phy/aquantia/aquantia_main.c | 29 +++++++++++++++++-------
>  1 file changed, 21 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/net/phy/aquantia/aquantia_main.c b/drivers/net/phy/aquantia/aquantia_main.c
> index d12e35374231..e982e9ce44a5 100644
> --- a/drivers/net/phy/aquantia/aquantia_main.c
> +++ b/drivers/net/phy/aquantia/aquantia_main.c
> @@ -653,13 +653,7 @@ static int aqr107_fill_interface_modes(struct phy_device *phydev)
>         unsigned long *possible = phydev->possible_interfaces;
>         unsigned int serdes_mode, rate_adapt;
>         phy_interface_t interface;
> -       int i, val, ret;
> -
> -       ret = phy_read_mmd_poll_timeout(phydev, MDIO_MMD_VEND1,
> -                                       VEND1_GLOBAL_CFG_10M, val, val != 0,
> -                                       1000, 100000, false);
> -       if (ret)
> -               return ret;
> +       int i, val;
>  
>         /* Walk the media-speed configuration registers to determine which
>          * host-side serdes modes may be used by the PHY depending on the
> @@ -708,6 +702,25 @@ static int aqr107_fill_interface_modes(struct phy_device *phydev)
>         return 0;
>  }
>  
> +static int aqr113c_fill_interface_modes(struct phy_device *phydev)
> +{
> +       int val, ret;
> +
> +       /* It's been observed on some models that - when coming out of suspend
> +        * - the FW signals that the PHY is ready but the GLOBAL_CFG registers
> +        * continue on returning zeroes for some time. Let's poll the 100M
> +        * register until it returns a real value as both 113c and 115c support
> +        * this mode.
> +        */
> +       ret = phy_read_mmd_poll_timeout(phydev, MDIO_MMD_VEND1,
> +                                       VEND1_GLOBAL_CFG_100M, val, val != 0,
> +                                       1000, 100000, false);
> +       if (ret)
> +               return ret;
> +
> +       return aqr107_fill_interface_modes(phydev);
> +}
> +
>  static int aqr113c_config_init(struct phy_device *phydev)
>  {
>         int ret;
> @@ -725,7 +738,7 @@ static int aqr113c_config_init(struct phy_device *phydev)
>         if (ret)
>                 return ret;
>  
> -       return aqr107_fill_interface_modes(phydev);
> +       return aqr113c_fill_interface_modes(phydev);
>  }
>  
>  static int aqr107_probe(struct phy_device *phydev)
> -- 
> 2.43.0
> 
>

Re: [PATCH net v2] net: phy: aquantia: only poll GLOBAL_CFG regs on aqr113, aqr113c and aqr115c

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Mon, 29 Jul 2024 17:03:14 +0200 you wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
> 
> Commit 708405f3e56e ("net: phy: aquantia: wait for the GLOBAL_CFG to
> start returning real values") introduced a workaround for an issue
> observed on aqr115c. However there were never any reports of it
> happening on other models and the workaround has been reported to cause
> and issue on aqr113c (and it may cause the same on any other model not
> supporting 10M mode).
> 
> [...]

Here is the summary with links:
  - [net,v2] net: phy: aquantia: only poll GLOBAL_CFG regs on aqr113, aqr113c and aqr115c
    https://git.kernel.org/netdev/net/c/a7f3abcf6357

You are awesome, thank you!
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