From: Lin Huang <hl@rock-chips.com>
Date: Sun, 9 Oct 2016 22:58:45 +0000 (-0700)
Subject: CHROMIUM: devfreq: rockchip: remove wait dcf irq evnet
X-Git-Tag: firefly_0821_release~1259
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;ds=sidebyside;h=1ddc04a6081cccfd70a38c22a977d7430b4cecc2;p=firefly-linux-kernel-4.4.55.git

CHROMIUM: devfreq: rockchip: remove wait dcf irq evnet

We have already wait dcf done in ATF, so don't need wait dcf irq
in kernel, besides, clear dcf irq in kernel will import competiton
between kernel and ATF, only handle dcf irq in ATF is a better way.

BUG=chrome-os-partner:54651
TEST=Boot from kevin

Change-Id: Ibfc460bebb86eb72a218fbf39176d30320da2c57
Signed-off-by: Lin Huang <hl@rock-chips.com>
Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>
---

diff --git a/drivers/devfreq/rk3399_dmc.c b/drivers/devfreq/rk3399_dmc.c
index 17ade53a5788..59f4e4b09761 100644
--- a/drivers/devfreq/rk3399_dmc.c
+++ b/drivers/devfreq/rk3399_dmc.c
@@ -126,7 +126,6 @@ static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
 			goto out;
 		}
 	}
-	dmcfreq->wait_dcf_flag = 1;
 
 	err = clk_set_rate(dmcfreq->dmc_clk, target_rate);
 	if (err) {
@@ -137,14 +136,6 @@ static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
 		goto out;
 	}
 
-	/*
-	 * Wait until bcf irq happen, it means freq scaling finish in
-	 * arm trust firmware, use 100ms as timeout time.
-	 */
-	if (!wait_event_timeout(dmcfreq->wait_dcf_queue,
-				!dmcfreq->wait_dcf_flag, HZ / 10))
-		dev_warn(dev, "Timeout waiting for dcf interrupt\n");
-
 	/*
 	 * Check the dpll rate,
 	 * There only two result we will get,
@@ -248,22 +239,6 @@ static __maybe_unused int rk3399_dmcfreq_resume(struct device *dev)
 static SIMPLE_DEV_PM_OPS(rk3399_dmcfreq_pm, rk3399_dmcfreq_suspend,
 			 rk3399_dmcfreq_resume);
 
-static irqreturn_t rk3399_dmc_irq(int irq, void *dev_id)
-{
-	struct rk3399_dmcfreq *dmcfreq = dev_id;
-	struct arm_smccc_res res;
-
-	dmcfreq->wait_dcf_flag = 0;
-	wake_up(&dmcfreq->wait_dcf_queue);
-
-	/* Clear the DCF interrupt */
-	arm_smccc_smc(ROCKCHIP_SIP_DRAM_FREQ, 0, 0,
-		      ROCKCHIP_SIP_CONFIG_DRAM_CLR_IRQ,
-		      0, 0, 0, 0, &res);
-
-	return IRQ_HANDLED;
-}
-
 static struct dram_timing *of_get_ddr_timings(struct device *dev,
 					      struct device_node *np)
 {
@@ -395,16 +370,11 @@ static int rk3399_dmcfreq_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct device_node *np = pdev->dev.of_node;
 	struct rk3399_dmcfreq *data;
-	int ret, irq, index, size;
+	int ret, index, size;
 	uint32_t *timing;
 	struct dev_pm_opp *opp;
 	struct devfreq_dev_profile *devp = &rk3399_devfreq_dmc_profile;
 
-	irq = platform_get_irq(pdev, 0);
-	if (irq < 0) {
-		dev_err(&pdev->dev, "Cannot get the dmc interrupt resource\n");
-		return -EINVAL;
-	}
 	data = devm_kzalloc(dev, sizeof(struct rk3399_dmcfreq), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;
@@ -423,17 +393,6 @@ static int rk3399_dmcfreq_probe(struct platform_device *pdev)
 		return PTR_ERR(data->dmc_clk);
 	};
 
-	data->irq = irq;
-	ret = devm_request_irq(dev, irq, rk3399_dmc_irq, 0,
-			       dev_name(dev), data);
-	if (ret) {
-		dev_err(dev, "Failed to request dmc irq: %d\n", ret);
-		return ret;
-	}
-
-	init_waitqueue_head(&data->wait_dcf_queue);
-	data->wait_dcf_flag = 0;
-
 	data->edev = devfreq_event_get_edev_by_phandle(dev, 0);
 	if (IS_ERR(data->edev))
 		return -EPROBE_DEFER;