From: Loic Poulain loic.poulain@linaro.org

On graceful power-down/disable transition, when an MHI reset is performed, the MHI device loses its context, including interrupt configuration. However, the current implementation is waiting for event(irq) driven state change to confirm reset has been completed, which never happens, and causes reset timeout, leading to unexpected high latency of the mhi_power_down procedure (up to 45 seconds).

Fix that by moving to the recently introduced poll_reg_field method, waiting for the reset bit to be cleared, in the same way as the power_on procedure.

Cc: stable@vger.kernel.org Fixes: a6e2e3522f29 ("bus: mhi: core: Add support for PM state transitions") Signed-off-by: Loic Poulain loic.poulain@linaro.org Reviewed-by: Bhaumik Bhatt bbhatt@codeaurora.org Reviewed-by: Manivannan Sadhasivam manivannan.sadhasivam@linaro.org Reviewed-by: Hemant Kumar hemantk@codeaurora.org Link: https://lore.kernel.org/r/1620029090-8975-1-git-send-email-loic.poulain@lina... Signed-off-by: Manivannan Sadhasivam manivannan.sadhasivam@linaro.org --- drivers/bus/mhi/core/pm.c | 18 +++++------------- 1 file changed, 5 insertions(+), 13 deletions(-)

diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c index e2e59a341fef..704a5e225097 100644 --- a/drivers/bus/mhi/core/pm.c +++ b/drivers/bus/mhi/core/pm.c @@ -465,23 +465,15 @@ 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)) { - u32 in_reset = -1; - unsigned long timeout = msecs_to_jiffies(mhi_cntrl->timeout_ms); - dev_dbg(dev, "Triggering MHI Reset in device\n"); mhi_set_mhi_state(mhi_cntrl, MHI_STATE_RESET);

/* Wait for the reset bit to be cleared by the device */ - ret = wait_event_timeout(mhi_cntrl->state_event, - mhi_read_reg_field(mhi_cntrl, - mhi_cntrl->regs, - MHICTRL, - MHICTRL_RESET_MASK, - MHICTRL_RESET_SHIFT, - &in_reset) || - !in_reset, timeout); - if (!ret || in_reset) - dev_err(dev, "Device failed to exit MHI Reset state\n"); + ret = mhi_poll_reg_field(mhi_cntrl, mhi_cntrl->regs, MHICTRL, + MHICTRL_RESET_MASK, MHICTRL_RESET_SHIFT, 0, + 25000); + if (ret) + dev_err(dev, "Device failed to clear MHI Reset\n");

/* * Device will clear BHI_INTVEC as a part of RESET processing,