Add a WARN to rule out an invalid output range and format
combination. This is to align the lspcon code with
compute_avi_infoframes.

Signed-off-by: Uma Shankar <uma.shan...@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_lspcon.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_lspcon.c 
b/drivers/gpu/drm/i915/display/intel_lspcon.c
index 7cb65e0f241e..9552dfc55e20 100644
--- a/drivers/gpu/drm/i915/display/intel_lspcon.c
+++ b/drivers/gpu/drm/i915/display/intel_lspcon.c
@@ -523,6 +523,10 @@ void lspcon_set_infoframes(struct intel_encoder *encoder,
        else
                frame.avi.colorspace = HDMI_COLORSPACE_RGB;
 
+       /* nonsense combination */
+       drm_WARN_ON(encoder->base.dev, crtc_state->limited_color_range &&
+                   crtc_state->output_format != INTEL_OUTPUT_FORMAT_RGB);
+
        if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_RGB) {
                drm_hdmi_avi_infoframe_quant_range(&frame.avi,
                                                   conn_state->connector,
-- 
2.26.2

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