Would you mind looking into this line of hdmi2.0.c and remove the check of line 2103 and line 2104?
2102 dev_info(&hdmi->dc->ndev->dev, "hdmi: get RGB quant from EDID.\n");
2103 if (tegra_edid_is_rgb_quantization_selectable(hdmi->edid)) {
2104 if (vmode & FB_VMODE_LIMITED_RANGE)
2105 hdmi_quant = HDMI_AVI_RGB_QUANT_LIMITED;
2106 else
2107 hdmi_quant = HDMI_AVI_RGB_QUANT_FULL;
2108 }
2109 return hdmi_quant;
2110 }
You could just give hdmi_quant =HDMI_AVI_RGB_QUANT_LIMITED.
Please help confirm if this can bypass the error and boot up.