Messages in this thread | | | From | Kai-Heng Feng <> | Date | Wed, 27 Oct 2021 06:50:05 +0800 | Subject | Re: [PATCH v2] e1000e: Add a delay to let ME unconfigure s0ix when DPG_EXIT_DONE is already flagged |
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On Tue, Oct 26, 2021 at 4:48 PM Sasha Neftin <sasha.neftin@intel.com> wrote: > > On 10/26/2021 09:51, Kai-Heng Feng wrote: > > On some ADL platforms, DPG_EXIT_DONE is always flagged so e1000e resume > > polling logic doesn't wait until ME really unconfigures s0ix. > > > > So check DPG_EXIT_DONE before issuing EXIT_DPG, and if it's already > > flagged, wait for 1 second to let ME unconfigure s0ix. > > > > Fixes: 3e55d231716e ("e1000e: Add handshake with the CSME to support S0ix") > > Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=214821 > > Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com> > > --- > > v2: > > Add missing "Fixes:" tag > > > > drivers/net/ethernet/intel/e1000e/netdev.c | 7 +++++++ > > 1 file changed, 7 insertions(+) > > > > diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c > > index 44e2dc8328a22..cd81ba00a6bc9 100644 > > --- a/drivers/net/ethernet/intel/e1000e/netdev.c > > +++ b/drivers/net/ethernet/intel/e1000e/netdev.c > > @@ -6493,14 +6493,21 @@ static void e1000e_s0ix_exit_flow(struct e1000_adapter *adapter) > > u32 mac_data; > > u16 phy_data; > > u32 i = 0; > > + bool dpg_exit_done; > > > > if (er32(FWSM) & E1000_ICH_FWSM_FW_VALID) { > > + dpg_exit_done = er32(EXFWSM) & E1000_EXFWSM_DPG_EXIT_DONE; > > /* Request ME unconfigure the device from S0ix */ > > mac_data = er32(H2ME); > > mac_data &= ~E1000_H2ME_START_DPG; > > mac_data |= E1000_H2ME_EXIT_DPG; > > ew32(H2ME, mac_data); > > > > + if (dpg_exit_done) { > > + e_warn("DPG_EXIT_DONE is already flagged. This is a firmware bug\n"); > > + msleep(1000); > > + } > Thanks for working on the enablement. > The delay approach is fragile. We need to work with CSME folks to > understand why _DPG_EXIT_DONE indication is wrong on some ADL platforms. > Could you provide CSME/BIOS version? dmidecode -t 0 and cat > /sys/class/mei/mei0/fw_ver
$ sudo dmidecode -t 0 # dmidecode 3.2 Getting SMBIOS data from sysfs. SMBIOS 3.4 present. # SMBIOS implementations newer than version 3.2.0 are not # fully supported by this version of dmidecode.
Handle 0x0001, DMI type 0, 26 bytes BIOS Information Vendor: Dell Inc. Version: 0.12.68 Release Date: 10/01/2021 ROM Size: 48 MB Characteristics: PCI is supported PNP is supported BIOS is upgradeable BIOS shadowing is allowed Boot from CD is supported Selectable boot is supported EDD is supported Print screen service is supported (int 5h) 8042 keyboard services are supported (int 9h) Serial services are supported (int 14h) Printer services are supported (int 17h) ACPI is supported USB legacy is supported BIOS boot specification is supported Function key-initiated network boot is supported Targeted content distribution is supported UEFI is supported BIOS Revision: 0.12
$ cat /sys/class/mei/mei0/fw_ver 0:16.0.15.1518 0:16.0.15.1518 0:16.0.15.1518
> > /* Poll up to 2.5 seconds for ME to unconfigure DPG. > > * If this takes more than 1 second, show a warning indicating a > > * firmware bug > >
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