[Intel-gfx] [PATCH 07/13] drm/i915/sdvo: Fail gracefully if the TV dotclock is out of range

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Instead of warning and continuing with bogus state when the
requested dotclock isn't acceptable just print some debug
spew and fail gracefully.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_sdvo.c | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_sdvo.c b/drivers/gpu/drm/i915/display/intel_sdvo.c
index 75a8e5583358..fcf3a95393d9 100644
--- a/drivers/gpu/drm/i915/display/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/display/intel_sdvo.c
@@ -1269,7 +1269,7 @@ intel_sdvo_get_preferred_input_mode(struct intel_sdvo *intel_sdvo,
 	return true;
 }
 
-static void i9xx_adjust_sdvo_tv_clock(struct intel_crtc_state *pipe_config)
+static int i9xx_adjust_sdvo_tv_clock(struct intel_crtc_state *pipe_config)
 {
 	struct drm_i915_private *dev_priv = to_i915(pipe_config->uapi.crtc->dev);
 	unsigned int dotclock = pipe_config->hw.adjusted_mode.crtc_clock;
@@ -1292,11 +1292,14 @@ static void i9xx_adjust_sdvo_tv_clock(struct intel_crtc_state *pipe_config)
 		clock->m1 = 12;
 		clock->m2 = 8;
 	} else {
-		drm_WARN(&dev_priv->drm, 1,
-			 "SDVO TV clock out of range: %i\n", dotclock);
+		drm_dbg_kms(&dev_priv->drm,
+			    "SDVO TV clock out of range: %i\n", dotclock);
+		return -EINVAL;
 	}
 
 	pipe_config->clock_set = true;
+
+	return 0;
 }
 
 static bool intel_has_hdmi_sink(struct intel_sdvo_connector *intel_sdvo_connector,
@@ -1414,8 +1417,13 @@ static int intel_sdvo_compute_config(struct intel_encoder *encoder,
 					       conn_state);
 
 	/* Clock computation needs to happen after pixel multiplier. */
-	if (IS_TV(intel_sdvo_connector))
-		i9xx_adjust_sdvo_tv_clock(pipe_config);
+	if (IS_TV(intel_sdvo_connector)) {
+		int ret;
+
+		ret = i9xx_adjust_sdvo_tv_clock(pipe_config);
+		if (ret)
+			return ret;
+	}
 
 	if (conn_state->picture_aspect_ratio)
 		adjusted_mode->picture_aspect_ratio =
-- 
2.39.3