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authorBhaumik Bhatt <bbhatt@codeaurora.org>2021-03-29 18:28:23 -0700
committerManivannan Sadhasivam <manivannan.sadhasivam@linaro.org>2021-03-31 16:51:43 +0530
commite72919cebd19618b7341e69034b4d9f7120ff4de (patch)
tree748c7e795f8fdec112f3a1ece7d93cd33c4dfaad /drivers/bus
parentd20e82d4d0167925191f57ccff8b6c406c06176f (diff)
bus: mhi: core: Wait for MHI READY state in most scenarios
When moving from SYS_ERROR transition to a different execution environment, MHI host relies on the BHI register read to spawn the next image download or wait for READY -> M0 states. The device can at times move the execution environment to mission mode when a pass through is expected, which can result in a stall. Initiate a wait for MHI READY and write M0 such that the device can proceed with state change event updates for any new execution environment being entered. This allows us to remove conditionals in handling firmware load for PBL modes and keeps the execution environment out of the picture as it can change at any time. 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/1617067704-28850-7-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/boot.c4
-rw-r--r--drivers/bus/mhi/core/pm.c3
2 files changed, 3 insertions, 4 deletions
diff --git a/drivers/bus/mhi/core/boot.c b/drivers/bus/mhi/core/boot.c
index 0f0ae8816e29..8100cf51cd09 100644
--- a/drivers/bus/mhi/core/boot.c
+++ b/drivers/bus/mhi/core/boot.c
@@ -416,8 +416,8 @@ void mhi_fw_load_handler(struct mhi_controller *mhi_cntrl)
}
}
- /* If device is in pass through, do reset to ready state transition */
- if (mhi_cntrl->ee == MHI_EE_PTHRU)
+ /* wait for ready on pass through or any other execution environment */
+ if (mhi_cntrl->ee != MHI_EE_EDL && mhi_cntrl->ee != MHI_EE_PBL)
goto fw_load_ready_state;
fw_name = (mhi_cntrl->ee == MHI_EE_EDL) ?
diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
index 7ac9dfe54895..b6920a5369a0 100644
--- a/drivers/bus/mhi/core/pm.c
+++ b/drivers/bus/mhi/core/pm.c
@@ -763,8 +763,7 @@ void mhi_pm_st_worker(struct work_struct *work)
if (MHI_REG_ACCESS_VALID(mhi_cntrl->pm_state))
mhi_cntrl->ee = mhi_get_exec_env(mhi_cntrl);
write_unlock_irq(&mhi_cntrl->pm_lock);
- if (MHI_IN_PBL(mhi_cntrl->ee))
- mhi_fw_load_handler(mhi_cntrl);
+ mhi_fw_load_handler(mhi_cntrl);
break;
case DEV_ST_TRANSITION_SBL:
write_lock_irq(&mhi_cntrl->pm_lock);