diff options
| author | Jeffrey Hugo <jhugo@codeaurora.org> | 2020-05-21 19:02:49 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-05-22 09:35:44 +0200 |
| commit | e18d4e9fa79bb27de6447c0c172bb1c428a52bb2 (patch) | |
| tree | af4db2a28e46e21def062407941fed5bd391dcfa /drivers | |
| parent | bus: mhi: core: Handle write lock properly in mhi_pm_m0_transition (diff) | |
| download | linux-e18d4e9fa79bb27de6447c0c172bb1c428a52bb2.tar.xz linux-e18d4e9fa79bb27de6447c0c172bb1c428a52bb2.zip | |
bus: mhi: core: Handle syserr during power_up
The MHI device may be in the syserr state when we attempt to init it in
power_up(). Since we have no local state, the handling is simple -
reset the device and wait for it to transition out of the reset state.
Signed-off-by: Jeffrey Hugo <jhugo@codeaurora.org>
Reviewed-by: Hemant Kumar <hemantk@codeaurora.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20200521170249.21795-15-manivannan.sadhasivam@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/bus/mhi/core/pm.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c index de5abb26bcae..796098078083 100644 --- a/drivers/bus/mhi/core/pm.c +++ b/drivers/bus/mhi/core/pm.c @@ -906,6 +906,7 @@ static void mhi_deassert_dev_wake(struct mhi_controller *mhi_cntrl, int mhi_async_power_up(struct mhi_controller *mhi_cntrl) { + enum mhi_state state; enum mhi_ee_type current_ee; enum dev_st_transition next_state; struct device *dev = &mhi_cntrl->mhi_dev->dev; @@ -975,6 +976,32 @@ int mhi_async_power_up(struct mhi_controller *mhi_cntrl) goto error_bhi_offset; } + state = mhi_get_mhi_state(mhi_cntrl); + if (state == MHI_STATE_SYS_ERR) { + mhi_set_mhi_state(mhi_cntrl, MHI_STATE_RESET); + ret = wait_event_timeout(mhi_cntrl->state_event, + MHI_PM_IN_FATAL_STATE(mhi_cntrl->pm_state) || + mhi_read_reg_field(mhi_cntrl, + mhi_cntrl->regs, + MHICTRL, + MHICTRL_RESET_MASK, + MHICTRL_RESET_SHIFT, + &val) || + !val, + msecs_to_jiffies(mhi_cntrl->timeout_ms)); + if (ret) { + ret = -EIO; + dev_info(dev, "Failed to reset MHI due to syserr state\n"); + goto error_bhi_offset; + } + + /* + * device cleares INTVEC as part of RESET processing, + * re-program it + */ + mhi_write_reg(mhi_cntrl, mhi_cntrl->bhi, BHI_INTVEC, 0); + } + /* Transition to next state */ next_state = MHI_IN_PBL(current_ee) ? DEV_ST_TRANSITION_PBL : DEV_ST_TRANSITION_READY; |