linux-kernel - [PATCH v2] mfd: qcom_rpm: write fw_version to CTRL

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Message-Id: <20181119195317.22617-1-jonathan@marek.ca>
Date:   Mon, 19 Nov 2018 14:53:17 -0500
From:   Jonathan Marek <jonathan@...ek.ca>
To:     bjorn.andersson@...aro.org
Cc:     Lee Jones <lee.jones@...aro.org>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2] mfd: qcom_rpm: write fw_version to CTRL_REG

This is required as part of the initialization sequence on certain SoCs.

If these registers are not initialized, the hardware can be unresponsive.
This fixes the driver on apq8060 (HP TouchPad device).

Signed-off-by: Jonathan Marek <jonathan@...ek.ca>
---
v2: updated the commit message to be more descriptive

I think its important to note that the downstream driver does this for
all versions, so it is safe to add this.

 drivers/mfd/qcom_rpm.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/mfd/qcom_rpm.c b/drivers/mfd/qcom_rpm.c
index 52fafea06067..8d420c37b2a6 100644
--- a/drivers/mfd/qcom_rpm.c
+++ b/drivers/mfd/qcom_rpm.c
@@ -638,6 +638,10 @@ static int qcom_rpm_probe(struct platform_device *pdev)
 		return -EFAULT;
 	}
 
+	writel(fw_version[0], RPM_CTRL_REG(rpm, 0));
+	writel(fw_version[1], RPM_CTRL_REG(rpm, 1));
+	writel(fw_version[2], RPM_CTRL_REG(rpm, 2));
+
 	dev_info(&pdev->dev, "RPM firmware %u.%u.%u\n", fw_version[0],
 							fw_version[1],
 							fw_version[2]);
-- 
2.17.1