netdev - Re: [PATCH V2] net: ethernet: ti: cpsw_new: enable mac_managed

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Date: Mon, 22 Jan 2024 15:18:13 +0200
From: Roger Quadros <rogerq@...nel.org>
To: Sinthu Raja <sinthu.raja@...tralsolutions.com>,
 Denis Kirjanov <dkirjanov@...e.de>, Siddharth Vadapalli
 <s-vadapalli@...com>, Ravi Gunasekaran <r-gunasekaran@...com>
Cc: linux-omap@...r.kernel.org, netdev@...r.kernel.org,
 Sinthu Raja <sinthu.raja@...com>
Subject: Re: [PATCH V2] net: ethernet: ti: cpsw_new: enable mac_managed_pm to
 fix mdio

Hi,

On 22/01/2024 11:33, Sinthu Raja wrote:
> From: Sinthu Raja <sinthu.raja@...com>
> 
> The below commit  introduced a WARN when phy state is not in the states:
> PHY_HALTED, PHY_READY and PHY_UP.
> commit 744d23c71af3 ("net: phy: Warn about incorrect mdio_bus_phy_resume() state")
> 
> When cpsw_new resumes, there have port in PHY_NOLINK state, so the below
> warning comes out. Set mac_managed_pm be true to tell mdio that the phy
> resume/suspend is managed by the mac, to fix the following warning:
> 
> WARNING: CPU: 0 PID: 965 at drivers/net/phy/phy_device.c:326 mdio_bus_phy_resume+0x140/0x144
> CPU: 0 PID: 965 Comm: sh Tainted: G           O       6.1.46-g247b2535b2 #1
> Hardware name: Generic AM33XX (Flattened Device Tree)
>  unwind_backtrace from show_stack+0x18/0x1c
>  show_stack from dump_stack_lvl+0x24/0x2c
>  dump_stack_lvl from __warn+0x84/0x15c
>  __warn from warn_slowpath_fmt+0x1a8/0x1c8
>  warn_slowpath_fmt from mdio_bus_phy_resume+0x140/0x144
>  mdio_bus_phy_resume from dpm_run_callback+0x3c/0x140
>  dpm_run_callback from device_resume+0xb8/0x2b8
>  device_resume from dpm_resume+0x144/0x314
>  dpm_resume from dpm_resume_end+0x14/0x20
>  dpm_resume_end from suspend_devices_and_enter+0xd0/0x924
>  suspend_devices_and_enter from pm_suspend+0x2e0/0x33c
>  pm_suspend from state_store+0x74/0xd0
>  state_store from kernfs_fop_write_iter+0x104/0x1ec
>  kernfs_fop_write_iter from vfs_write+0x1b8/0x358
>  vfs_write from ksys_write+0x78/0xf8
>  ksys_write from ret_fast_syscall+0x0/0x54
> Exception stack(0xe094dfa8 to 0xe094dff0)
> dfa0:                   00000004 005c3fb8 00000001 005c3fb8 00000004 00000001
> dfc0: 00000004 005c3fb8 b6f6bba0 00000004 00000004 0059edb8 00000000 00000000
> dfe0: 00000004 bed918f0 b6f09bd3 b6e89a66
> 
> Fixes: 744d23c71af3 ("net: phy: Warn about incorrect mdio_bus_phy_resume() state")
> Signed-off-by: Sinthu Raja <sinthu.raja@...com>
> ---
> 
> Changes in V2:
> Address review comment
> 	Add Fixes tag.
> 
> V1: https://patchwork.kernel.org/project/netdevbpf/patch/20240122083414.6246-1-sinthu.raja@ti.com/
> 
>  drivers/net/ethernet/ti/cpsw_new.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/net/ethernet/ti/cpsw_new.c b/drivers/net/ethernet/ti/cpsw_new.c
> index 498c50c6d1a7..087dcb67505a 100644
> --- a/drivers/net/ethernet/ti/cpsw_new.c
> +++ b/drivers/net/ethernet/ti/cpsw_new.c
> @@ -773,6 +773,9 @@ static void cpsw_slave_open(struct cpsw_slave *slave, struct cpsw_priv *priv)
>  			slave->slave_num);
>  		return;
>  	}
> +
> +	phy->mac_managed_pm = true;
> +
>  	slave->phy = phy;
>  
>  	phy_attached_info(slave->phy);

I believe this cpsw.c will also be affected by the same issue. Right?
Also you will need to Cc: stable@...r.kernel.org # v6.0+

-- 
cheers,
-roger