linux-kernel - [PATCH v2 04/12] bus: mhi: core: Move to SYS

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Date:   Thu, 29 Oct 2020 18:51:55 -0700
From:   Bhaumik Bhatt <bbhatt@...eaurora.org>
To:     manivannan.sadhasivam@...aro.org
Cc:     linux-arm-msm@...r.kernel.org, hemantk@...eaurora.org,
        jhugo@...eaurora.org, linux-kernel@...r.kernel.org,
        Bhaumik Bhatt <bbhatt@...eaurora.org>
Subject: [PATCH v2 04/12] bus: mhi: core: Move to SYS_ERROR regardless of RDDM capability

In some cases, the entry of device to RDDM execution environment
can occur after a significant amount of time has elapsed and a
SYS_ERROR state change event has already arrived. This can result
in scenarios where MHI controller and client drivers are unaware
of the error state of the device. Remove the check for rddm_image
when processing the SYS_ERROR state change as it is present in
mhi_pm_sys_err_handler() already and prevent further activity
until the expected RDDM execution environment change occurs or
the controller driver decides further action.

Signed-off-by: Bhaumik Bhatt <bbhatt@...eaurora.org>
---
 drivers/bus/mhi/core/main.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c
index 2cff5dd..1f32d67 100644
--- a/drivers/bus/mhi/core/main.c
+++ b/drivers/bus/mhi/core/main.c
@@ -733,19 +733,15 @@ int mhi_process_ctrl_ev_ring(struct mhi_controller *mhi_cntrl,
 				break;
 			case MHI_STATE_SYS_ERR:
 			{
-				enum mhi_pm_state new_state;
-
-				/* skip SYS_ERROR handling if RDDM supported */
-				if (mhi_cntrl->ee == MHI_EE_RDDM ||
-				    mhi_cntrl->rddm_image)
-					break;
+				enum mhi_pm_state state = MHI_PM_STATE_MAX;
 
 				dev_dbg(dev, "System error detected\n");
 				write_lock_irq(&mhi_cntrl->pm_lock);
-				new_state = mhi_tryset_pm_state(mhi_cntrl,
+				if (mhi_cntrl->ee != MHI_EE_RDDM)
+					state = mhi_tryset_pm_state(mhi_cntrl,
 							MHI_PM_SYS_ERR_DETECT);
 				write_unlock_irq(&mhi_cntrl->pm_lock);
-				if (new_state == MHI_PM_SYS_ERR_DETECT)
+				if (state == MHI_PM_SYS_ERR_DETECT)
 					mhi_pm_sys_err_handler(mhi_cntrl);
 				break;
 			}
-- 
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