linux-kernel - [PATCH v2 1/2] bus: mhi: core: Move serial number read to power up phase

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Message-Id: <1627517860-39417-2-git-send-email-bbhatt@codeaurora.org>
Date:   Wed, 28 Jul 2021 17:17:39 -0700
From:   Bhaumik Bhatt <bbhatt@...eaurora.org>
To:     manivannan.sadhasivam@...aro.org
Cc:     linux-arm-msm@...r.kernel.org, hemantk@...eaurora.org,
        linux-kernel@...r.kernel.org, loic.poulain@...aro.org,
        Bhaumik Bhatt <bbhatt@...eaurora.org>
Subject: [PATCH v2 1/2] bus: mhi: core: Move serial number read to power up phase

In some cases device may boot straight to ready and move to AMSS
execution environment. Serial number and OEM PK Hash values would
remain unpopulated in those scenarios. Move the reads for those
power up preparation phase for controllers to always have them
populated.

Signed-off-by: Bhaumik Bhatt <bbhatt@...eaurora.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.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 0a97262..e13d34c 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 5aaca6d..d98a14b 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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