From 9f1591231aa72edd2cdad507520ad4088682262a Mon Sep 17 00:00:00 2001 From: Mikko Perttunen Date: Wed, 28 Aug 2013 18:48:38 +0300 Subject: [PATCH] drm/tegra: hdmi: Detect DVI-only displays Use EDID data to determine whether the display supports HDMI or DVI only. The HDMI output used to assume to be connected to HDMI displays, but that broke support for DVI displays that don't understand the interspersed audio/other data. To be on the safe side, default to DVI if no EDID data is available. Signed-off-by: Mikko Perttunen [treding@nvidia.com: move detection to separate function] Signed-off-by: Thierry Reding --- drivers/gpu/drm/tegra/hdmi.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/gpu/drm/tegra/hdmi.c b/drivers/gpu/drm/tegra/hdmi.c index ce32bfb..35a745a 100644 --- a/drivers/gpu/drm/tegra/hdmi.c +++ b/drivers/gpu/drm/tegra/hdmi.c @@ -674,6 +674,18 @@ static void tegra_hdmi_setup_tmds(struct tegra_hdmi *hdmi, HDMI_NV_PDISP_SOR_IO_PEAK_CURRENT); } +static bool tegra_output_is_hdmi(struct tegra_output *output) +{ + struct edid *edid; + + if (!output->connector.edid_blob_ptr) + return false; + + edid = (struct edid *)output->connector.edid_blob_ptr->data; + + return drm_detect_hdmi_monitor(edid); +} + static int tegra_output_hdmi_enable(struct tegra_output *output) { unsigned int h_sync_width, h_front_porch, h_back_porch, i, rekey; @@ -686,6 +698,8 @@ static int tegra_output_hdmi_enable(struct tegra_output *output) int retries = 1000; int err; + hdmi->dvi = !tegra_output_is_hdmi(output); + pclk = mode->clock * 1000; h_sync_width = mode->hsync_end - mode->hsync_start; h_back_porch = mode->htotal - mode->hsync_end; -- 2.7.4