pt., 21 paź 2022 o 13:19 Lukas Wunner <lukas@xxxxxxxxx> napisał(a): > > On Fri, Oct 21, 2022 at 12:17:35PM +0200, Lukasz Majczak wrote: > > While working with Vidya???s patch I have noticed that after > > suspend/resume cycle on my Chromebook (Apollolake) PCIe bridge loses > > its capabilities - the missing part is: > > > > Capabilities: [200 v1] L1 PM Substates > > L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ > > PortCommonModeRestoreTime=40us PortTPowerOnTime=10us > > L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > > T_CommonMode=40us LTR1.2_Threshold=98304ns > > L1SubCtl2: T_PwrOn=60us > > > > Digging more I???ve found out that entering D3Cold state causes this > > You mean the capability is gone from lspci after D3cold? > > My understanding is that BIOS is responsible for populating config space. > So this sounds like a BIOS bug. What's the BIOS vendor and version? > (dmesg | grep DMI) > > Thanks, > > Lukas Hi Lukasz here is the DMI localhost ~ # dmesg | grep DMI [ 0.000000] DMI: Google Coral/Coral, BIOS Google_Coral.10068.81.0 11/27/2018 [ 0.155420] ACPI: Added _OSI(Linux-Lenovo-NV-HDMI-Audio) [ 0.447820] [drm] DMI info: DMI_BIOS_VENDOR coreboot [ 0.447828] [drm] DMI info: DMI_BIOS_VERSION Google_Coral.10068.81.0 [ 0.447832] [drm] DMI info: DMI_BIOS_DATE 11/27/2018 [ 0.447835] [drm] DMI info: DMI_BIOS_RELEASE 4.0 [ 0.447838] [drm] DMI info: DMI_SYS_VENDOR Google [ 0.447841] [drm] DMI info: DMI_PRODUCT_NAME Coral [ 0.447844] [drm] DMI info: DMI_PRODUCT_VERSION rev3 [ 0.447848] [drm] DMI info: DMI_PRODUCT_FAMILY Google_Coral Yes, you are right and in our internal discussion the vendor (Intel) has proposed a firmware patch, although I couldn't verified that the issue is limited only to the given firmware/bios, so decided to send this email. Best regards, Lukasz
