From c35ad31401c079e1fe1bebb1b7d5be2940668676 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Wed, 8 Jan 2020 20:12:39 +0200 Subject: [PATCH] drm/i915: Reject DRM_MODE_FLAG_DBLCLK with DVI sinks MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit The code assumes that DRM_MODE_FLAG_DBLCLK means that we enable the pixel repeat feature. That only works with HDMI since it requires AVI infoframe to signal the information to the sink. Hence even if the mode dotclock would be valid we cannot currently assume that we can just ignore the DBLCLK flag. Reject it for DVI sinks. Signed-off-by: Ville Syrjälä Link: https://patchwork.freedesktop.org/patch/msgid/20200108181242.13650-6-ville.syrjala@linux.intel.com Reviewed-by: Imre Deak --- drivers/gpu/drm/i915/display/intel_hdmi.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c index 8e9abb28072c6..7dc11ea4c6e42 100644 --- a/drivers/gpu/drm/i915/display/intel_hdmi.c +++ b/drivers/gpu/drm/i915/display/intel_hdmi.c @@ -2242,8 +2242,11 @@ intel_hdmi_mode_valid(struct drm_connector *connector, if (clock > max_dotclk) return MODE_CLOCK_HIGH; - if (mode->flags & DRM_MODE_FLAG_DBLCLK) + if (mode->flags & DRM_MODE_FLAG_DBLCLK) { + if (!has_hdmi_sink) + return MODE_CLOCK_LOW; clock *= 2; + } if (drm_mode_is_420_only(&connector->display_info, mode)) clock /= 2; -- 2.30.2