diff options
| author | Loic Poulain <[email protected]> | 2021-12-09 18:46:33 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <[email protected]> | 2021-12-09 18:47:05 +0100 |
| commit | cab2d3fd6866e089b5c50db09dece131f85bfebd (patch) | |
| tree | f70432b5cd866c8fb658634158abbc0039d45e35 /include/linux | |
| parent | 7c602f5d04f44f590c2ab06efbd2869936960db0 (diff) | |
bus: mhi: core: Add support for forced PM resume
For whatever reason, some devices like QCA6390, WCN6855 using ath11k
are not in M3 state during PM resume, but still functional. The
mhi_pm_resume should then not fail in those cases, and let the higher
level device specific stack continue resuming process.
Add an API mhi_pm_resume_force(), to force resuming irrespective of the
current MHI state. This fixes a regression with non functional ath11k WiFi
after suspend/resume cycle on some machines.
Bug report: https://bugzilla.kernel.org/show_bug.cgi?id=214179
Link: https://lore.kernel.org/regressions/[email protected]/
Fixes: 020d3b26c07a ("bus: mhi: Early MHI resume failure in non M3 state")
Cc: [email protected] #5.13
Reported-by: Kalle Valo <[email protected]>
Reported-by: Pengyu Ma <[email protected]>
Tested-by: Kalle Valo <[email protected]>
Acked-by: Kalle Valo <[email protected]>
Signed-off-by: Loic Poulain <[email protected]>
[mani: Switched to API, added bug report, reported-by tags and CCed stable]
Signed-off-by: Manivannan Sadhasivam <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/mhi.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/mhi.h b/include/linux/mhi.h index 723985879035..a5cc4cdf9cc8 100644 --- a/include/linux/mhi.h +++ b/include/linux/mhi.h @@ -664,6 +664,19 @@ int mhi_pm_suspend(struct mhi_controller *mhi_cntrl); int mhi_pm_resume(struct mhi_controller *mhi_cntrl); /** + * mhi_pm_resume_force - Force resume MHI from suspended state + * @mhi_cntrl: MHI controller + * + * Resume the device irrespective of its MHI state. As per the MHI spec, devices + * has to be in M3 state during resume. But some devices seem to be in a + * different MHI state other than M3 but they continue working fine if allowed. + * This API is intented to be used for such devices. + * + * Return: 0 if the resume succeeds, a negative error code otherwise + */ +int mhi_pm_resume_force(struct mhi_controller *mhi_cntrl); + +/** * mhi_download_rddm_image - Download ramdump image from device for * debugging purpose. * @mhi_cntrl: MHI controller |