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authorMikko Perttunen <mperttunen@nvidia.com>2013-08-28 18:48:38 +0300
committerThierry Reding <treding@nvidia.com>2013-10-31 09:55:43 +0100
commit9f1591231aa72edd2cdad507520ad4088682262a (patch)
tree280d7b006694075d9e4c04d843d861a8d713431b
parent7d1d28aca08b974963feac19c05e0084e04db946 (diff)
downloadblackbird-op-linux-9f1591231aa72edd2cdad507520ad4088682262a.tar.gz
blackbird-op-linux-9f1591231aa72edd2cdad507520ad4088682262a.zip
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 <mperttunen@nvidia.com> [treding@nvidia.com: move detection to separate function] Signed-off-by: Thierry Reding <treding@nvidia.com>
-rw-r--r--drivers/gpu/drm/tegra/hdmi.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/gpu/drm/tegra/hdmi.c b/drivers/gpu/drm/tegra/hdmi.c
index ce32bfb7f86d..35a745a6a5ca 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;
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