[PATCH v2 2/2] drm: tegra: check HDMI sink capability

[Lucas Stach <dev-8ppwABl0HbeELgA04lAiVw@public.gmane.org>]

Check if sink is HDMI capable when enabling an output. This disables
HDMI audio/infoframes if we are talking to a plain DVI sink. All things
except this check are already in place.

Signed-off-by: Lucas Stach <dev-8ppwABl0HbeELgA04lAiVw@public.gmane.org>
---
 drivers/gpu/drm/tegra/hdmi.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/tegra/hdmi.c b/drivers/gpu/drm/tegra/hdmi.c
index e060c7e..3405313 100644
--- a/drivers/gpu/drm/tegra/hdmi.c
+++ b/drivers/gpu/drm/tegra/hdmi.c
@@ -660,6 +660,9 @@ static int tegra_output_hdmi_enable(struct tegra_output *output)
 	usleep_range(1000, 2000);
 	tegra_periph_reset_deassert(hdmi->clk);
 
+	/* if the connected sink is not HDMI capable fall back to plain DVI */
+	hdmi->dvi = !drm_detect_hdmi_monitor(output->edid);
+
 	tegra_dc_writel(dc, VSYNC_H_POSITION(1),
 			DC_DISP_DISP_TIMING_OPTIONS);
 	tegra_dc_writel(dc, DITHER_CONTROL_DISABLE | BASE_COLOR_SIZE888,
-- 
1.8.0.2