samsung/panel: add the functions of waiting for vsync

Bug: 274187749
Change-Id: Iedd736ff7753da1ada8669e8f30c7603f87838ba
Signed-off-by: Shiyong Li <shiyongli@google.com>

2 files changed, 37 insertions, 0 deletions

diff --git a/samsung/panel/panel-samsung-drv.c b/samsung/panel/panel-samsung-drv.c
index eba999e..234577a 100644
--- a/samsung/panel/panel-samsung-drv.c
+++ b/samsung/panel/panel-samsung-drv.c
@@ -3400,6 +3400,39 @@ static u64 exynos_panel_vsync_start_time_us(u32 te_us, u32 te_period_us)
 	return te_period_us * 55 / 100;
 }
 
+int exynos_panel_wait_for_vblank(struct exynos_panel *ctx)
+{
+	struct drm_crtc *crtc = NULL;
+
+	if (ctx->exynos_connector.base.state)
+		crtc = ctx->exynos_connector.base.state->crtc;
+
+	if (crtc && !drm_crtc_vblank_get(crtc)) {
+		drm_crtc_wait_one_vblank(crtc);
+		drm_crtc_vblank_put(crtc);
+		return 0;
+	}
+
+	WARN_ON(1);
+	return -ENODEV;
+}
+EXPORT_SYMBOL(exynos_panel_wait_for_vblank);
+
+void exynos_panel_wait_for_vsync_done(struct exynos_panel *ctx, u32 te_us, u32 period_us)
+{
+	u32 delay_us;
+
+	if (unlikely(exynos_panel_wait_for_vblank(ctx))) {
+		delay_us = period_us + 1000;
+		usleep_range(delay_us, delay_us + 10);
+		return;
+	}
+
+	delay_us = exynos_panel_vsync_start_time_us(te_us, period_us);
+	usleep_range(delay_us, delay_us + 10);
+}
+EXPORT_SYMBOL(exynos_panel_wait_for_vsync_done);
+
 /* avoid accumulate te varaince cause predicted value is not accurate enough */
 #define ACCEPTABLE_TE_PERIOD_DETLA_NS	(3 * NSEC_PER_SEC)
 static ktime_t exynos_panel_te_ts_prediction(struct exynos_panel *ctx, ktime_t last_te,
diff --git a/samsung/panel/panel-samsung-drv.h b/samsung/panel/panel-samsung-drv.h
index f91f801..fe46b3b 100644
--- a/samsung/panel/panel-samsung-drv.h
+++ b/samsung/panel/panel-samsung-drv.h
@@ -913,6 +913,10 @@ static inline bool is_local_hbm_disabled(struct exynos_panel *ctx)
 	i > 0;										\
 	i--, data++)									\
 
+#define EXYNOS_VREFRESH_TO_PERIOD_USEC(rate) DIV_ROUND_UP(USEC_PER_SEC, (rate) ? (rate) : 60)
+
+int exynos_panel_wait_for_vblank(struct exynos_panel *ctx);
+void exynos_panel_wait_for_vsync_done(struct exynos_panel *ctx, u32 te_us, u32 period_us);
 unsigned int panel_get_idle_time_delta(struct exynos_panel *ctx);
 int exynos_panel_configure_te2_edges(struct exynos_panel *ctx,
 				     u32 *timings, bool lp_mode);