3 files changed, 18 insertions, 3 deletions
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 926e05f0db24..26ab00862b59 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1012,6 +1012,9 @@ static bool i915_get_crtc_scanoutpos(struct drm_device *dev, unsigned int pipe,
 	int position;
 	int vbl_start, vbl_end, hsync_start, htotal, vtotal;
 	unsigned long irqflags;
+	bool use_scanline_counter = INTEL_GEN(dev_priv) >= 5 ||
+		IS_G4X(dev_priv) || IS_GEN(dev_priv, 2) ||
+		mode->private_flags & I915_MODE_FLAG_USE_SCANLINE_COUNTER;
 
 	if (WARN_ON(!mode->crtc_clock)) {
 		DRM_DEBUG_DRIVER("trying to get scanoutpos for disabled "
@@ -1044,7 +1047,7 @@ static bool i915_get_crtc_scanoutpos(struct drm_device *dev, unsigned int pipe,
 	if (stime)
 		*stime = ktime_get();
 
-	if (IS_GEN(dev_priv, 2) || IS_G4X(dev_priv) || INTEL_GEN(dev_priv) >= 5) {
+	if (use_scanline_counter) {
 		/* No obvious pixelcount register. Only query vertical
 		 * scanout position from Display scan line register.
 		 */
@@ -1104,7 +1107,7 @@ static bool i915_get_crtc_scanoutpos(struct drm_device *dev, unsigned int pipe,
 	else
 		position += vtotal - vbl_end;
 
-	if (IS_GEN(dev_priv, 2) || IS_G4X(dev_priv) || INTEL_GEN(dev_priv) >= 5) {
+	if (use_scanline_counter) {
 		*vpos = position;
 		*hpos = 0;
 	} else {
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 47195320413a..35fbc527c19e 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -629,9 +629,11 @@ struct intel_crtc_scaler_state {
 };
 
 /* drm_mode->private_flags */
-#define I915_MODE_FLAG_INHERITED 1
+#define I915_MODE_FLAG_INHERITED (1<<0)
 /* Flag to get scanline using frame time stamps */
 #define I915_MODE_FLAG_GET_SCANLINE_FROM_TIMESTAMP (1<<1)
+/* Flag to use the scanline counter instead of the pixel counter */
+#define I915_MODE_FLAG_USE_SCANLINE_COUNTER (1<<2)
 
 struct intel_pipe_wm {
 	struct intel_wm_level wm[5];
diff --git a/drivers/gpu/drm/i915/intel_tv.c b/drivers/gpu/drm/i915/intel_tv.c
index 78be08e2971b..751b88dde18e 100644
--- a/drivers/gpu/drm/i915/intel_tv.c
+++ b/drivers/gpu/drm/i915/intel_tv.c
@@ -1150,6 +1150,11 @@ intel_tv_get_config(struct intel_encoder *encoder,
 				 ypos, mode.vdisplay - ysize - ypos);
 
 	adjusted_mode->crtc_clock = mode.clock;
+
+	/* pixel counter doesn't work on i965gm TV output */
+	if (IS_I965GM(dev_priv))
+		adjusted_mode->private_flags |=
+			I915_MODE_FLAG_USE_SCANLINE_COUNTER;
 }
 
 static int
@@ -1295,6 +1300,11 @@ intel_tv_compute_config(struct intel_encoder *encoder,
 	drm_mode_set_crtcinfo(adjusted_mode, 0);
 	adjusted_mode->name[0] = '\0';
 
+	/* pixel counter doesn't work on i965gm TV output */
+	if (IS_I965GM(dev_priv))
+		adjusted_mode->private_flags |=
+			I915_MODE_FLAG_USE_SCANLINE_COUNTER;
+
 	return 0;
 }