Dear Bean we can choose one of two h8 for sure, and we chosed auto h8 during sys active. when ufs suspend/resume, ufshcd_link_state_transtion will send DME h8 enter/exit always. that's why the above sequence show up. " UFSHCI has idle time before bringing Link into hibern8 mode, " I think ufs put the link to h8 during the time Bean Huo <huobean@xxxxxxxxx> 于2022年10月12日周三 22:25写道： > > On Tue, 2022-10-11 at 19:53 +0800, 高严凯 wrote: > > Dear Avri > > Unisoc reports resume fail on UFS(micron FS164) during > > suspend/resume test. > > We check host inserts auto H8 enter/exit event between SSU sleep > > command and H8 enter command in runtime suspend . > > Asfollows: SSU Sleep command --> auto H8 enter --> auto H8 exit --> > > H8 enter --> idle 2ms --> VCC off. > > However device AQL FW can’t enter LPM within 2ms after second H8 > > enter command. > > FW already enter LPM after receive auto H8 enter command , Next > > auto > > H8 exit command will trigger FW exit from LPM, it need take over > > 10ms, > > and FW can’t enter > > LPM again after second H8 enter command until device complete exit > > from LPM. So disable auto h8 before ssu is a reasonable solution to > > solve it. > > Hynix also has similar request. > > > Hi gaoyan, > > The above sequence confuses me. UFSHCI has idle time before bringing > Link into hibern8 mode, do you know what the settings are? > > Also, if auto-hibern8 is supported, in this case, the host-side SW > should not send manual hibern8. If this is an issue to all UFS or > UFSHCI, we should disable manual hibern8 if auto-hibern8 is enabled. or > let customer to choose one of two. > > > Kind regards, > Bean
