From: Andrzej Hajda <a.hajda@samsung.com>
Date: Thu, 24 Aug 2017 15:33:50 +0200
Subject: drm/exynos/decon5433: use readl_poll_timeout helpers
Git-commit: 30b8913fd3ebc89d8a261b0d75e7034c3460adb9
Patch-mainline: v4.14-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Linux core provide helpers for polling with timeout, lets use them.

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/exynos/exynos5433_drm_decon.c |   20 ++++++++------------
 1 file changed, 8 insertions(+), 12 deletions(-)

--- a/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
+++ b/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
@@ -13,6 +13,7 @@
 #include <linux/platform_device.h>
 #include <linux/clk.h>
 #include <linux/component.h>
+#include <linux/iopoll.h>
 #include <linux/mfd/syscon.h>
 #include <linux/of_device.h>
 #include <linux/of_gpio.h>
@@ -407,24 +408,19 @@ static void decon_atomic_flush(struct ex
 
 static void decon_swreset(struct decon_context *ctx)
 {
-	unsigned int tries;
 	unsigned long flags;
+	u32 val;
+	int ret;
 
 	writel(0, ctx->addr + DECON_VIDCON0);
-	for (tries = 2000; tries; --tries) {
-		if (~readl(ctx->addr + DECON_VIDCON0) & VIDCON0_STOP_STATUS)
-			break;
-		udelay(10);
-	}
+	readl_poll_timeout(ctx->addr + DECON_VIDCON0, val,
+			   ~val & VIDCON0_STOP_STATUS, 12, 20000);
 
 	writel(VIDCON0_SWRESET, ctx->addr + DECON_VIDCON0);
-	for (tries = 2000; tries; --tries) {
-		if (~readl(ctx->addr + DECON_VIDCON0) & VIDCON0_SWRESET)
-			break;
-		udelay(10);
-	}
+	ret = readl_poll_timeout(ctx->addr + DECON_VIDCON0, val,
+				 ~val & VIDCON0_SWRESET, 12, 20000);
 
-	WARN(tries == 0, "failed to software reset DECON\n");
+	WARN(ret < 0, "failed to software reset DECON\n");
 
 	spin_lock_irqsave(&ctx->vblank_lock, flags);
 	ctx->frame_id = 0;