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@marek.ca>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

diff --git a/drivers/mfd/qcom_rpm.c b/drivers/mfd/qcom_rpm.c
index 52fafea06067e17cfd7ea14c0fc033764fc561c9..8d420c37b2a613c87f45970c8abe06390c234c04 100644 (file)
--- 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]);