drm/exynos/decon5433: always do sw-trigger when vblanks enabled

When vblanks are enabled userspace and/or kernel can expect vblank
interrupt at declared period of time. To generate vblank interrupt
image transfer must be triggered. This patch fixes vblank timeouts
in case of sw-trigger mode.
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

@@ -49,6 +49,7 @@ static const char * const decon_clks_name[] = {
 
 enum decon_flag_bits {
 	BIT_CLKS_ENABLED,
+	BIT_IRQS_ENABLED,
 	BIT_WIN_UPDATED,
 	BIT_SUSPENDED
 };
@@ -104,6 +105,7 @@ static int decon_enable_vblank(struct exynos_drm_crtc *crtc)
 		val |= VIDINTCON0_INTFRMEN | VIDINTCON0_FRAMESEL_FP;
 
 	writel(val, ctx->addr + DECON_VIDINTCON0);
+	set_bit(BIT_IRQS_ENABLED, &ctx->flags);
 
 	return 0;
 }
@@ -112,6 +114,7 @@ static void decon_disable_vblank(struct exynos_drm_crtc *crtc)
 {
 	struct decon_context *ctx = crtc->ctx;
 
+	clear_bit(BIT_IRQS_ENABLED, &ctx->flags);
 	if (test_bit(BIT_SUSPENDED, &ctx->flags))
 		return;
 
@@ -518,7 +521,8 @@ static void decon_te_irq_handler(struct exynos_drm_crtc *crtc)
 	    (ctx->out_type & I80_HW_TRG))
 		return;
 
-	if (test_and_clear_bit(BIT_WIN_UPDATED, &ctx->flags))
+	if (test_and_clear_bit(BIT_WIN_UPDATED, &ctx->flags) ||
+	    test_bit(BIT_IRQS_ENABLED, &ctx->flags))
 		decon_set_bits(ctx, DECON_TRIGCON, TRIGCON_SWTRIGCMD, ~0);
 }