linux-kernel - [PATCH 10/10] bus: mhi: core: Improve debug messages for power up

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Date:   Mon,  2 Aug 2021 10:42:55 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     gregkh@...uxfoundation.org
Cc:     hemantk@...eaurora.org, bbhatt@...eaurora.org,
        linux-arm-msm@...r.kernel.org, jhugo@...eaurora.org,
        linux-kernel@...r.kernel.org, loic.poulain@...aro.org,
        Jeffrey Hugo <quic_jhugo@...cinc.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: [PATCH 10/10] bus: mhi: core: Improve debug messages for power up

From: Bhaumik Bhatt <bbhatt@...eaurora.org>

Improve error message to be more descriptive if a failure occurs
with an invalid power up execution environment. Additionally, add
a debug log to print the execution environment and MHI state
before a power up is attempted to confirm if the device is in an
expected state. This helps clarify reasons for power up failures
such as the device being found in a PBL or Emergency Download
Mode execution environment and the host expected a full power up
with Pass-Through and no image loading involved.

Signed-off-by: Bhaumik Bhatt <bbhatt@...eaurora.org>
Reviewed-by: Hemant Kumar <hemantk@...eaurora.org>
Reviewed-by: Jeffrey Hugo <quic_jhugo@...cinc.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Link: https://lore.kernel.org/r/1620072038-36160-1-git-send-email-bbhatt@codeaurora.org
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---
 drivers/bus/mhi/core/pm.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
index ff7cdc8653ef..fb99e3727155 100644
--- a/drivers/bus/mhi/core/pm.c
+++ b/drivers/bus/mhi/core/pm.c
@@ -1069,12 +1069,16 @@ int mhi_async_power_up(struct mhi_controller *mhi_cntrl)
 
 	/* Confirm that the device is in valid exec env */
 	if (!MHI_IN_PBL(current_ee) && current_ee != MHI_EE_AMSS) {
-		dev_err(dev, "Not a valid EE for power on\n");
+		dev_err(dev, "%s is not a valid EE for power on\n",
+			TO_MHI_EXEC_STR(current_ee));
 		ret = -EIO;
 		goto error_async_power_up;
 	}
 
 	state = mhi_get_mhi_state(mhi_cntrl);
+	dev_dbg(dev, "Attempting power on with EE: %s, state: %s\n",
+		TO_MHI_EXEC_STR(current_ee), TO_MHI_STATE_STR(state));
+
 	if (state == MHI_STATE_SYS_ERR) {
 		mhi_set_mhi_state(mhi_cntrl, MHI_STATE_RESET);
 		ret = wait_event_timeout(mhi_cntrl->state_event,
-- 
2.25.1