drm/exynos/decon5433: kill BIT_IRQS_ENABLED

BIT_IRQS_ENABLED flag duplicates drm_vblank_crtc::refcount, it could be
safely removed.
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

drivers/gpu/drm/exynos/exynos5433_drm_decon.c

@@ -49,7 +49,6 @@ static const char * const decon_clks_name[] = {
 
 enum decon_flag_bits {
 	BIT_CLKS_ENABLED,
-	BIT_IRQS_ENABLED,
 	BIT_WIN_UPDATED,
 	BIT_SUSPENDED
 };
@@ -98,7 +97,6 @@ static int decon_enable_vblank(struct exynos_drm_crtc *crtc)
 	if (test_bit(BIT_SUSPENDED, &ctx->flags))
 		return -EPERM;
 
-	if (!test_and_set_bit(BIT_IRQS_ENABLED, &ctx->flags)) {
 	val = VIDINTCON0_INTEN;
 	if (ctx->out_type & IFTYPE_I80)
 		val |= VIDINTCON0_FRAMEDONE;
@@ -106,7 +104,6 @@ static int decon_enable_vblank(struct exynos_drm_crtc *crtc)
 		val |= VIDINTCON0_INTFRMEN | VIDINTCON0_FRAMESEL_FP;
 
 	writel(val, ctx->addr + DECON_VIDINTCON0);
-	}
 
 	return 0;
 }
@@ -118,7 +115,6 @@ static void decon_disable_vblank(struct exynos_drm_crtc *crtc)
 	if (test_bit(BIT_SUSPENDED, &ctx->flags))
 		return;
 
-	if (test_and_clear_bit(BIT_IRQS_ENABLED, &ctx->flags))
 	writel(0, ctx->addr + DECON_VIDINTCON0);
 }
 
@@ -489,10 +485,6 @@ static void decon_enable(struct exynos_drm_crtc *crtc)
 
 	decon_swreset(ctx);
 
-	/* if vblank was enabled status, enable it again. */
-	if (test_and_clear_bit(BIT_IRQS_ENABLED, &ctx->flags))
-		decon_enable_vblank(ctx->crtc);
-
 	decon_commit(ctx->crtc);
 }