RE: [PATCH v5 2/4] e1000e: bump up timeout to wait when ME un-configures ULP mode

[Shen, Yijun]

> -----Original Message-----
> From: Limonciello, Mario <Mario_Limonciello@xxxxxxxx>
> Sent: Tuesday, December 15, 2020 3:30 AM
> To: Jeff Kirsher; Tony Nguyen; intel-wired-lan@xxxxxxxxxxxxxxxx
> Cc: linux-kernel@xxxxxxxxxxxxxxx; Netdev; Alexander Duyck; Jakub Kicinski;
> Sasha Netfin; Aaron Brown; Stefan Assmann; David Miller;
> darcari@xxxxxxxxxx; Shen, Yijun; Yuan, Perry;
> anthony.wong@xxxxxxxxxxxxx; Hans de Goede; Limonciello, Mario; Aaron
> Ma; Mark Pearson
> Subject: [PATCH v5 2/4] e1000e: bump up timeout to wait when ME un-
> configures ULP mode
> 
> Per guidance from Intel ethernet architecture team, it may take up to 1
> second for unconfiguring ULP mode.
> 
> However in practice this seems to be taking up to 2 seconds on some Lenovo
> machines.  Detect scenarios that take more than 1 second but less than 2.5
> seconds and emit a warning on resume for those scenarios.
> 
> Suggested-by: Aaron Ma <aaron.ma@xxxxxxxxxxxxx>
> Suggested-by: Sasha Netfin <sasha.neftin@xxxxxxxxx>
> Suggested-by: Hans de Goede <hdegoede@xxxxxxxxxx>
> CC: Mark Pearson <markpearson@xxxxxxxxxx>
> Fixes: f15bb6dde738cc8fa0 ("e1000e: Add support for S0ix")
> BugLink: https://bugs.launchpad.net/bugs/1865570
> Link: https://patchwork.ozlabs.org/project/intel-wired-
> lan/patch/20200323191639.48826-1-aaron.ma@xxxxxxxxxxxxx/
> Link: https://lkml.org/lkml/2020/12/13/15
> Link: https://lkml.org/lkml/2020/12/14/708
> Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxxx>

Verified this series patches with Dell Systems.

Tested-By: Yijun Shen <Yijun.shen@xxxxxxxx>

> ---
>  drivers/net/ethernet/intel/e1000e/ich8lan.c | 16 +++++++++++++---
>  1 file changed, 13 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/e1000e/ich8lan.c
> b/drivers/net/ethernet/intel/e1000e/ich8lan.c
> index 9aa6fad8ed47..fdf23d20c954 100644
> --- a/drivers/net/ethernet/intel/e1000e/ich8lan.c
> +++ b/drivers/net/ethernet/intel/e1000e/ich8lan.c
> @@ -1240,6 +1240,9 @@ static s32 e1000_disable_ulp_lpt_lp(struct
> e1000_hw *hw, bool force)
>  		return 0;
> 
>  	if (er32(FWSM) & E1000_ICH_FWSM_FW_VALID) {
> +		struct e1000_adapter *adapter = hw->adapter;
> +		bool firmware_bug = false;
> +
>  		if (force) {
>  			/* Request ME un-configure ULP mode in the PHY */
>  			mac_reg = er32(H2ME);
> @@ -1248,16 +1251,23 @@ static s32 e1000_disable_ulp_lpt_lp(struct
> e1000_hw *hw, bool force)
>  			ew32(H2ME, mac_reg);
>  		}
> 
> -		/* Poll up to 300msec for ME to clear ULP_CFG_DONE. */
> +		/* Poll up to 2.5 seconds for ME to clear ULP_CFG_DONE.
> +		 * If this takes more than 1 second, show a warning indicating
> a firmware
> +		 * bug */
>  		while (er32(FWSM) & E1000_FWSM_ULP_CFG_DONE) {
> -			if (i++ == 30) {
> +			if (i++ == 250) {
>  				ret_val = -E1000_ERR_PHY;
>  				goto out;
>  			}
> +			if (i > 100 && !firmware_bug)
> +				firmware_bug = true;
> 
>  			usleep_range(10000, 11000);
>  		}
> -		e_dbg("ULP_CONFIG_DONE cleared after %dmsec\n", i * 10);
> +		if (firmware_bug)
> +			e_warn("ULP_CONFIG_DONE took %dmsec.  This is a
> firmware bug\n", i * 10);
> +		else
> +			e_dbg("ULP_CONFIG_DONE cleared after %dmsec\n",
> i * 10);
> 
>  		if (force) {
>  			mac_reg = er32(H2ME);
> --
> 2.25.1