Bug 198951

Summary: rtsx_pci does not allow package state to go down pc3 after suspend/resume
Product: Drivers Reporter: Jacopo De Simoi (wilderkde)
Component: MMC/SDAssignee: drivers_mmc-sd
Status: NEW ---    
Severity: normal CC: bjorn, james
Priority: P1    
Hardware: All   
OS: Linux   
Kernel Version: 4.15.5 Subsystem:
Regression: No Bisected commit-id:
Attachments: dmesg log
lscpci -vvxxxx output

Description Jacopo De Simoi 2018-03-01 04:00:47 UTC 

    


    


      



        
          Comment 1
        

        
          Jacopo De Simoi

        

        
        

        
          2018-03-01 04:09:06 UTC
        

      






I am investigating some power consumption specifics of my skylake-based laptop (Thinkpad T460s).  
It appears that without the module rtsx_pci (used for the sd card reader) the package power state never goes deeper than pc3.  As soon as I modprobe the module, power state reaches up to pc7.  

After a suspend/resume cycle the power state again does not go deeper than pc3 (no error in the logs).

At this point removing and reloading the module makes low power states available again. 

Please let me know if additional information is needed.

    


    


      



        
          Comment 2
        

        
          James Ettle

        

        
        

        
          2020-06-25 22:18:51 UTC
        

      






Still seen in 5.6.19 -- see also 208117. Have you checked if this is related to the ASPM state (see the contents of l1_aspm for this device under sysfs).

    


    


      



        
          Comment 3
        

        
          Jacopo De Simoi

        

        
        

        
          2020-07-25 19:47:53 UTC
        

      






Created attachment 290565 [details]
dmesg log

    


    


      



        
          Comment 4
        

        
          Jacopo De Simoi

        

        
        

        
          2020-07-25 19:48:25 UTC
        

      






Created attachment 290567 [details]
lscpci -vvxxxx output

    


    


      



        
          Comment 5
        

        
          Jacopo De Simoi

        

        
        

        
          2020-07-25 19:52:13 UTC
        

      






The lspci output is for a working situation, after suspending and resuming, and after reloading the module.  Please let me know which other situations I need to take snapshots of

Thanks a lot for your time in looking into this.