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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>
This commit is contained in:
Jeffrey Hugo 2020-05-21 22:32:49 +05:30 committed by Greg Kroah-Hartman
parent 3bc1a5f431
commit e18d4e9fa7
1 changed files with 27 additions and 0 deletions
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27
drivers/bus/mhi/core/pm.c
View File

@ -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;