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

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[ Upstream commit cabce92dd805945a090dc6fc73b001bb35ed083a ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Qiang Yu 2023-05-18 14:22:39 +08:00 committed by Greg Kroah-Hartman
parent de20747ee6
commit 15dabd02a9
1 changed files with 5 additions and 0 deletions
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5
drivers/bus/mhi/host/pm.c
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@ -490,6 +490,10 @@ static void mhi_pm_disable_transition(struct mhi_controller *mhi_cntrl,
u32 in_reset = -1;
unsigned long timeout = msecs_to_jiffies(mhi_cntrl->timeout_ms);
/* 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);
@ -515,6 +519,7 @@ static void mhi_pm_disable_transition(struct mhi_controller *mhi_cntrl,
mhi_write_reg(mhi_cntrl, mhi_cntrl->bhi, BHI_INTVEC, 0);
}
skip_mhi_reset:
dev_dbg(dev,
"Waiting for all pending event ring processing to complete\n");
mhi_event = mhi_cntrl->mhi_event;