From: Finley Xiao <finley.xiao@rock-chips.com>
Date: Tue, 2 May 2017 12:30:13 +0000 (+0800)
Subject: PM / devfreq: rockchip_dmc: add mutex lock for pmu register
X-Git-Tag: release-20171130_firefly~4^2~670
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=9c76cd21b9c935645f9b4c61edfd1e8b5d0cbe4a;p=firefly-linux-kernel-4.4.55.git

PM / devfreq: rockchip_dmc: add mutex lock for pmu register

As dmc may also assess register PMU_BUS_IDLE_REQ, we should prevent
pd driver and dmc driver assessing this register at the same time.

Change-Id: I546033536c87dcf497774cbc6c8f36a3e651ff07
Signed-off-by: Finley Xiao <finley.xiao@rock-chips.com>
---

diff --git a/drivers/devfreq/rockchip_dmc.c b/drivers/devfreq/rockchip_dmc.c
index dce8b4d945c1..8e0db7368a1a 100644
--- a/drivers/devfreq/rockchip_dmc.c
+++ b/drivers/devfreq/rockchip_dmc.c
@@ -30,6 +30,7 @@
 #include <linux/suspend.h>
 
 #include <soc/rockchip/rkfb_dmc.h>
+#include <soc/rockchip/rockchip_dmc.h>
 #include <soc/rockchip/rockchip_sip.h>
 #include <soc/rockchip/scpi.h>
 
@@ -653,6 +654,9 @@ static int rockchip_dmcfreq_probe(struct platform_device *pdev)
 	data->dev = dev;
 	platform_set_drvdata(pdev, data);
 
+	if (rockchip_pm_register_notify_to_dmc(data->devfreq))
+		dev_err(dev, "pd fail to register notify to dmc\n");
+
 	if (vop_register_dmc())
 		dev_err(dev, "fail to register notify to vop.\n");