> -----Original Message-----
> From: Limonciello, Mario <mario_limoncie...@dell.com>
> Sent: Tuesday, December 15, 2020 3:30 AM
> To: Jeff Kirsher; Tony Nguyen; intel-wired-...@lists.osuosl.org
> Cc: linux-ker...@vger.kernel.org; Netdev; Alexander Duyck; Jakub Kicinski;
> Sasha Netfin; Aaron Brown; Stefan Assmann; David Miller;
> darc...@redhat.com; Shen, Yijun; Yuan, Perry;
> anthony.w...@canonical.com; 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...@canonical.com>
> Suggested-by: Sasha Netfin <sasha.nef...@intel.com>
> Suggested-by: Hans de Goede <hdego...@redhat.com>
> CC: Mark Pearson <markpear...@lenovo.com>
> 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...@canonical.com/
> Link: https://lkml.org/lkml/2020/12/13/15
> Link: https://lkml.org/lkml/2020/12/14/708
> Signed-off-by: Mario Limonciello <mario.limoncie...@dell.com>
Verified this series patches with Dell Systems.
Tested-By: Yijun Shen <yijun.s...@dell.com>
> ---
> 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
