On Tue, 23 Mar 2021 at 15:00, Ulf Hansson <ulf.hansson@xxxxxxxxxx> wrote: > > On Tue, 23 Mar 2021 at 11:49, hieagle <chgokhl@xxxxxxxxx> wrote: > > > > We encounter a resume issue in our device sometimes. The mmc device's > > parent list is > > mmc0:0001->mmc_host mmc0->fa630000.mmc->soc in our soc. We found in the blow > > case with mmc0->power.disable_depth=0 the mmc_runtime_resume will be skipped, > > which cause subsequent mmc command fail. > > > > mmc_get_card(mmc0:0001)->pm_runtime_get_sync->rpm_resume(mmc0:0001)->rpm_resume(mmc0) > > The rpm_resume(mmc0) return -ENOSYS due to no callback and > > mmc0->power.runtime_status > > keep RPM_SUSPENDED. This lead to rpm_resume(mmc0:0001) return -EBUSY and skip > > rpm_callback which call mmc_runtime_resume, the mmc is still in > > suspended and the > > subsequent mmc command fail. > > > > [ 198.856157] Call trace: > > [ 198.858917] [<ffffff800808bd9c>] dump_backtrace+0x0/0x1cc > > [ 198.864966] [<ffffff800808bf7c>] show_stack+0x14/0x1c > > [ 198.870627] [<ffffff8008400e88>] dump_stack+0xa8/0xe0 > > [ 198.876288] [<ffffff800854d38c>] rpm_resume+0x850/0x938 > > [ 198.882141] [<ffffff800854cd8c>] rpm_resume+0x250/0x938 > > [ 198.887994] [<ffffff800854d4c4>] __pm_runtime_resume+0x50/0x74 > > [ 198.894530] [<ffffff80087b9e64>] mmc_get_card+0x3c/0xb8 > > [ 198.900388] [<ffffff80087cd2e0>] mmc_blk_issue_rq+0x2b0/0x4d8 > > [ 198.906824] [<ffffff80087cd5e4>] mmc_queue_thread+0xdc/0x198 > > [ 198.913165] [<ffffff80080d4b2c>] kthread+0xec/0x100 > > [ 198.918632] [<ffffff8008083890>] ret_from_fork+0x10/0x40 > > [ 198.924582] mmc0 callback (null) > > [ 198.935837] mmcblk mmc0:0001: __pm_runtime_resume ret -16 > > > > Mark mmc_host device with pm_runtime_no_callbacks will solve the issue. > > Thanks. > > Huanlin Ke > > Thanks for sharing more details! I have to admit, that this sounds > quite weird to me. I wonder if this is a problem that deserves to be > fixed in the runtime PM core.... > > Let me have a closer look a get back to you again. Please be patient > though, I have a busy week in front of me. Just wanted to notify you that I haven't forgotten. I will look into this beginning of the next week. [...] Kind regards Uffe
