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bus: mhi: host: Skip MHI reset if device is in RDDM 

commit cabce92dd8 upstream.

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: a6e2e3522f ("bus: mhi: core: Add support for PM state transitions")
Signed-off-by: Qiang Yu <quic_qianyu@quicinc.com>
Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Reviewed-by: Manivannan Sadhasivam <mani@kernel.org>
Link: https://lore.kernel.org/r/1684390959-17836-1-git-send-email-quic_qianyu@quicinc.com
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Qiang Yu 2023-05-18 14:22:39 +08:00 committed by Greg Kroah-Hartman
parent fd9a8ad2cf
commit 8b4d0f3890
1 changed files with 5 additions and 0 deletions
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5
drivers/bus/mhi/host/pm.c
View File

@ -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 */ /* Trigger MHI RESET so that the device will not access host memory */
if (!MHI_PM_IN_FATAL_STATE(mhi_cntrl->pm_state)) { 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"); dev_dbg(dev, "Triggering MHI Reset in device\n");
mhi_set_mhi_state(mhi_cntrl, MHI_STATE_RESET); 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, dev_dbg(dev,
"Waiting for all pending event ring processing to complete\n"); "Waiting for all pending event ring processing to complete\n");
mhi_event = mhi_cntrl->mhi_event; mhi_event = mhi_cntrl->mhi_event;