From 587bf496d6186332ff863abffcf314b374c569e1 Mon Sep 17 00:00:00 2001 From: Mika Kahola Date: Tue, 2 Feb 2016 15:16:39 +0200 Subject: [PATCH] drm/i915: HDMI pixel clock check MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit It is possible the we request to have a mode that has higher pixel clock than our HW can support. This patch checks if requested pixel clock is lower than the one supported by the HW. The requested mode is discarded if we cannot support the requested pixel clock. This patch applies to HDMI. V2: - removed computation for max dot clock V3: - cleanup by removing unnecessary lines V4: - max_pixclk variable renamed as max_dotclk - check for stereo mode added Signed-off-by: Mika Kahola Reviewed-by: Ville Syrjälä Signed-off-by: Daniel Vetter Link: http://patchwork.freedesktop.org/patch/msgid/1454419003-6001-3-git-send-email-mika.kahola@intel.com --- drivers/gpu/drm/i915/intel_hdmi.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c index 8698a643d027..edb7e901ba4a 100644 --- a/drivers/gpu/drm/i915/intel_hdmi.c +++ b/drivers/gpu/drm/i915/intel_hdmi.c @@ -1202,11 +1202,19 @@ intel_hdmi_mode_valid(struct drm_connector *connector, struct drm_device *dev = intel_hdmi_to_dev(hdmi); enum drm_mode_status status; int clock; + int max_dotclk = to_i915(connector->dev)->max_dotclk_freq; if (mode->flags & DRM_MODE_FLAG_DBLSCAN) return MODE_NO_DBLESCAN; clock = mode->clock; + + if ((mode->flags & DRM_MODE_FLAG_3D_MASK) == DRM_MODE_FLAG_3D_FRAME_PACKING) + clock *= 2; + + if (clock > max_dotclk) + return MODE_CLOCK_HIGH; + if (mode->flags & DRM_MODE_FLAG_DBLCLK) clock *= 2; -- 2.39.2