linux-kernel - [PATCH v1 1/2] bus: mhi: core: Read serial number during pre-powerup phase

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Message-Id: <1626395276-24171-2-git-send-email-bbhatt@codeaurora.org>
Date:   Thu, 15 Jul 2021 17:27:55 -0700
From:   Bhaumik Bhatt <bbhatt@...eaurora.org>
To:     manivannan.sadhasivam@...aro.org
Cc:     linux-arm-msm@...r.kernel.org, hemantk@...eaurora.org,
        quic_jhugo@...cinc.com, linux-kernel@...r.kernel.org,
        loic.poulain@...aro.org, Bhaumik Bhatt <bbhatt@...eaurora.org>
Subject: [PATCH v1 1/2] bus: mhi: core: Read serial number during pre-powerup phase

In some cases, device may boot straight to the mission mode
execution environment and skip the PBL transition or firmware
load procedure. Serial number and OEM PK hash values would remain
unpopulated in those scenarios. Move the reads for those to the
power up preparation phase such that controllers always have them
populated.

Signed-off-by: Bhaumik Bhatt <bbhatt@...eaurora.org>
---
 drivers/bus/mhi/core/boot.c | 17 +----------------
 drivers/bus/mhi/core/init.c | 17 ++++++++++++++++-
 2 files changed, 17 insertions(+), 17 deletions(-)

diff --git a/drivers/bus/mhi/core/boot.c b/drivers/bus/mhi/core/boot.c
index 8100cf5..213307ab 100644
--- a/drivers/bus/mhi/core/boot.c
+++ b/drivers/bus/mhi/core/boot.c
@@ -394,28 +394,13 @@ void mhi_fw_load_handler(struct mhi_controller *mhi_cntrl)
 	void *buf;
 	dma_addr_t dma_addr;
 	size_t size;
-	int i, ret;
+	int ret;
 
 	if (MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state)) {
 		dev_err(dev, "Device MHI is not in valid state\n");
 		return;
 	}
 
-	/* save hardware info from BHI */
-	ret = mhi_read_reg(mhi_cntrl, mhi_cntrl->bhi, BHI_SERIALNU,
-			   &mhi_cntrl->serial_number);
-	if (ret)
-		dev_err(dev, "Could not capture serial number via BHI\n");
-
-	for (i = 0; i < ARRAY_SIZE(mhi_cntrl->oem_pk_hash); i++) {
-		ret = mhi_read_reg(mhi_cntrl, mhi_cntrl->bhi, BHI_OEMPKHASH(i),
-				   &mhi_cntrl->oem_pk_hash[i]);
-		if (ret) {
-			dev_err(dev, "Could not capture OEM PK HASH via BHI\n");
-			break;
-		}
-	}
-
 	/* 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;
diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
index aeb1e3c..8b4336e 100644
--- a/drivers/bus/mhi/core/init.c
+++ b/drivers/bus/mhi/core/init.c
@@ -1065,7 +1065,7 @@ int mhi_prepare_for_power_up(struct mhi_controller *mhi_cntrl)
 {
 	struct device *dev = &mhi_cntrl->mhi_dev->dev;
 	u32 bhi_off, bhie_off;
-	int ret;
+	int i, ret;
 
 	mutex_lock(&mhi_cntrl->pm_mutex);
 
@@ -1124,6 +1124,21 @@ int mhi_prepare_for_power_up(struct mhi_controller *mhi_cntrl)
 
 	mutex_unlock(&mhi_cntrl->pm_mutex);
 
+	/* save hardware info from BHI */
+	ret = mhi_read_reg(mhi_cntrl, mhi_cntrl->bhi, BHI_SERIALNU,
+			   &mhi_cntrl->serial_number);
+	if (ret)
+		dev_err(dev, "Could not capture serial number via BHI\n");
+
+	for (i = 0; i < ARRAY_SIZE(mhi_cntrl->oem_pk_hash); i++) {
+		ret = mhi_read_reg(mhi_cntrl, mhi_cntrl->bhi, BHI_OEMPKHASH(i),
+				   &mhi_cntrl->oem_pk_hash[i]);
+		if (ret) {
+			dev_err(dev, "Could not capture OEM PK HASH via BHI\n");
+			break;
+		}
+	}
+
 	return 0;
 
 error_reg_offset:
-- 
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