On Mon, Mar 29, 2021 at 06:28:20PM -0700, Bhaumik Bhatt wrote:
> Device entering EDL or Emergency Download Mode will be in a
> SYS_ERROR MHI state. This requires MHI host to proceed with the
> EDL image download over BHI before device can enter an MHI READY
> state and proceed with further bootup. Allow this to be handled
> by relying on the execution environment check after SYS_ERROR
> processing to determine whether to wait for an MHI READY or
> download the EDL image over BHI after moving MHI PM state to
> Power on Reset internally. This way handling is contained well
> within the MHI core driver and helps pave the way for Flash
> Programmer execution environment functionality.
>
> Signed-off-by: Bhaumik Bhatt <bbhatt@xxxxxxxxxxxxxx>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
Thanks,
Mani
> ---
> drivers/bus/mhi/core/pm.c | 19 ++++++++++++++++++-
> 1 file changed, 18 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
> index fbe9447..b65222e 100644
> --- a/drivers/bus/mhi/core/pm.c
> +++ b/drivers/bus/mhi/core/pm.c
> @@ -564,6 +564,7 @@ static void mhi_pm_disable_transition(struct mhi_controller *mhi_cntrl)
> static void mhi_pm_sys_error_transition(struct mhi_controller *mhi_cntrl)
> {
> enum mhi_pm_state cur_state, prev_state;
> + enum dev_st_transition next_state;
> struct mhi_event *mhi_event;
> struct mhi_cmd_ctxt *cmd_ctxt;
> struct mhi_cmd *mhi_cmd;
> @@ -677,7 +678,23 @@ static void mhi_pm_sys_error_transition(struct mhi_controller *mhi_cntrl)
> er_ctxt->wp = er_ctxt->rbase;
> }
>
> - mhi_ready_state_transition(mhi_cntrl);
> + /* Transition to next state */
> + if (MHI_IN_PBL(mhi_get_exec_env(mhi_cntrl))) {
> + write_lock_irq(&mhi_cntrl->pm_lock);
> + cur_state = mhi_tryset_pm_state(mhi_cntrl, MHI_PM_POR);
> + write_unlock_irq(&mhi_cntrl->pm_lock);
> + if (cur_state != MHI_PM_POR) {
> + dev_err(dev, "Error moving to state %s from %s\n",
> + to_mhi_pm_state_str(MHI_PM_POR),
> + to_mhi_pm_state_str(cur_state));
> + goto exit_sys_error_transition;
> + }
> + next_state = DEV_ST_TRANSITION_PBL;
> + } else {
> + next_state = DEV_ST_TRANSITION_READY;
> + }
> +
> + mhi_queue_state_transition(mhi_cntrl, next_state);
>
> exit_sys_error_transition:
> dev_dbg(dev, "Exiting with PM state: %s, MHI state: %s\n",
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>
