ACK: [PATCH 1/1] UBUNTU: SAUCE: e1000e: Increase polling timeout on MDIC ready bit

[Stefan Bader]

On 29.09.20 17:07, Kai-Heng Feng wrote:
> BugLink: https://bugs.launchpad.net/bugs/1897755
> 
> We are seeing the following error after S3 resume:
> [  704.746874] e1000e 0000:00:1f.6 eno1: Setting page 0x6020
> [  704.844232] e1000e 0000:00:1f.6 eno1: MDI Write did not complete
> [  704.902817] e1000e 0000:00:1f.6 eno1: Setting page 0x6020
> [  704.903075] e1000e 0000:00:1f.6 eno1: reading PHY page 769 (or 0x6020 shifted) reg 0x17
> [  704.903281] e1000e 0000:00:1f.6 eno1: Setting page 0x6020
> [  704.903486] e1000e 0000:00:1f.6 eno1: writing PHY page 769 (or 0x6020 shifted) reg 0x17
> [  704.943155] e1000e 0000:00:1f.6 eno1: MDI Error
> ...
> [  705.108161] e1000e 0000:00:1f.6 eno1: Hardware Error
> 
> This patch only papers over the symptom, as we don't really know the
> root cause of the issue. The most possible culprit is Intel ME, which
> may do its own things that conflict with software.
> 
> Intel ethernet devs are aware of this issue, though they think this is
> not the right solution. However, instead of papering over the cracks,
> they don't have any solution either because they don't support ME under
> Linux :)
> 
> Full discussion can be found here:
> https://lore.kernel.org/lkml/20200923074751.10527-1-kai.heng.feng@canonical.com/
> 
> Signed-off-by: Kai-Heng Feng <kai.heng.feng at canonical.com>
Acked-by: Stefan Bader <stefan.bader at canonical.com>
> ---
>  drivers/net/ethernet/intel/e1000e/phy.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/intel/e1000e/phy.c b/drivers/net/ethernet/intel/e1000e/phy.c
> index e11c877595fb..e6d4acd90937 100644
> --- a/drivers/net/ethernet/intel/e1000e/phy.c
> +++ b/drivers/net/ethernet/intel/e1000e/phy.c
> @@ -203,7 +203,7 @@ s32 e1000e_write_phy_reg_mdic(struct e1000_hw *hw, u32 offset, u16 data)
>  	 * Increasing the time out as testing showed failures with
>  	 * the lower time out
>  	 */
> -	for (i = 0; i < (E1000_GEN_POLL_TIMEOUT * 3); i++) {
> +	for (i = 0; i < (E1000_GEN_POLL_TIMEOUT * 10); i++) {
>  		udelay(50);
>  		mdic = er32(MDIC);
>  		if (mdic & E1000_MDIC_READY)
> 


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