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authorQiang Yu <quic_qianyu@quicinc.com>2023-05-18 14:22:39 +0800
committerManivannan Sadhasivam <manivannan.sadhasivam@linaro.org>2023-07-12 17:49:38 +0530
commitcabce92dd805945a090dc6fc73b001bb35ed083a (patch)
treee7d58be533c655fe455b77d491cbbbbcbdac9f68 /drivers/bus/mhi
parent06c2afb862f9da8dc5efa4b6076a0e48c3fbaaa5 (diff)
bus: mhi: host: Skip MHI reset if device is in RDDM
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> 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>
Diffstat (limited to 'drivers/bus/mhi')
-rw-r--r--drivers/bus/mhi/host/pm.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/bus/mhi/host/pm.c b/drivers/bus/mhi/host/pm.c
index 083459028a4b..8a4362d75fc4 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;