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authorBhaumik Bhatt <bbhatt@codeaurora.org>2021-03-30 04:28:20 +0300
committerManivannan Sadhasivam <manivannan.sadhasivam@linaro.org>2021-03-31 14:17:07 +0300
commitad416db9fabe43b53a80deb4444d2a2e246b1cf1 (patch)
tree16334fd19d36eab18b5532af22f85f55445170fb /drivers/bus
parent4f214496ac7421b027a41d067e7753ee0bc5ad6c (diff)
downloadlinux-ad416db9fabe43b53a80deb4444d2a2e246b1cf1.tar.xz
bus: mhi: core: Handle EDL mode entry appropriately
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@codeaurora.org> Reviewed-by: Loic Poulain <loic.poulain@linaro.org> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Link: https://lore.kernel.org/r/1617067704-28850-4-git-send-email-bbhatt@codeaurora.org Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Diffstat (limited to 'drivers/bus')
-rw-r--r--drivers/bus/mhi/core/pm.c19
1 files changed, 18 insertions, 1 deletions
diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
index fbe944730401..b65222eda5e6 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",