On Thu, May 18, 2023 at 02:22:39PM +0800, Qiang Yu wrote:
In RDDM EE, device can not process MHI reset issued by host. In case of MHI power off, host is issuing MHI reset and polls for it to get cleared until it times out. Since this timeout can not be avoided in case of RDDM, skip the MHI reset in this scenarios.
Cc: stable@vger.kernel.org Fixes: a6e2e3522f29 ("bus: mhi: core: Add support for PM state transitions") Signed-off-by: Qiang Yu quic_qianyu@quicinc.com
Applied to mhi-next!
- Mani
Reviewed-by: Jeffrey Hugo quic_jhugo@quicinc.com
v1->v2: use ~75 columns in commit text, add Fixes tag v2->v3: update Fixes tag v3->v4: add review tag and CC stable
drivers/bus/mhi/host/pm.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/drivers/bus/mhi/host/pm.c b/drivers/bus/mhi/host/pm.c index 0834590..8a4362d 100644 --- a/drivers/bus/mhi/host/pm.c +++ b/drivers/bus/mhi/host/pm.c @@ -470,6 +470,10 @@ static void mhi_pm_disable_transition(struct mhi_controller *mhi_cntrl) /* Trigger MHI RESET so that the device will not access host memory */ if (!MHI_PM_IN_FATAL_STATE(mhi_cntrl->pm_state)) {
/* Skip MHI RESET if in RDDM state */if (mhi_cntrl->rddm_image && mhi_get_exec_env(mhi_cntrl) == MHI_EE_RDDM)goto skip_mhi_reset;- dev_dbg(dev, "Triggering MHI Reset in device\n"); mhi_set_mhi_state(mhi_cntrl, MHI_STATE_RESET);
@@ -495,6 +499,7 @@ static void mhi_pm_disable_transition(struct mhi_controller *mhi_cntrl) } } +skip_mhi_reset: dev_dbg(dev, "Waiting for all pending event ring processing to complete\n"); mhi_event = mhi_cntrl->mhi_event; -- 2.7.4