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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Jonathan Marek <jonathan@marek.ca>,
        Lee Jones <lee.jones@linaro.org>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.20 031/183] mfd: qcom_rpm: write fw_version to CTRL_REG
Date:   Mon, 25 Feb 2019 22:10:04 +0100
Message-Id: <20190225195059.912180064@linuxfoundation.org>
In-Reply-To: <20190225195054.748060397@linuxfoundation.org>
References: <20190225195054.748060397@linuxfoundation.org>
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4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit 504e4175829c44328773b96ad9c538e4783a8d22 ]

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@marek.ca>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 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 52fafea06067e..8d420c37b2a61 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]);
-- 
2.19.1