drm/i915: add a "force-dvi" HDMI audio mode

When HDMI-DVI converter is used, it's not only necessary to turn off
audio, but also to disable HDMI_MODE_SELECT and video infoframe. Since
the DVI mode is mainly tied to audio functionality from end user POV,
add a new "force-dvi" audio mode:

	xrandr --output HDMI1 --set audio force-dvi

Note that most users won't need to set this and happily rely on the EDID
based DVI auto detection.

Reported-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 563d24e..caec1fd 100644 (file)
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -762,6 +762,13 @@ typedef struct drm_i915_private {
        struct drm_property *force_audio_property;
 } drm_i915_private_t;
 
+enum hdmi_force_audio {
+       HDMI_AUDIO_OFF_DVI = -2,        /* no aux data for HDMI-DVI converter */
+       HDMI_AUDIO_OFF,                 /* force turn off HDMI audio */
+       HDMI_AUDIO_AUTO,                /* trust EDID */
+       HDMI_AUDIO_ON,                  /* force turn on HDMI audio */
+};
+
 enum i915_cache_level {
        I915_CACHE_NONE,
        I915_CACHE_LLC,

diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index 086288e..cae3e5f 100644 (file)
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -44,7 +44,7 @@ struct intel_hdmi {
        uint32_t color_range;
        bool has_hdmi_sink;
        bool has_audio;
-       int force_audio;
+       enum hdmi_force_audio force_audio;
        void (*write_infoframe)(struct drm_encoder *encoder,
                                struct dip_infoframe *frame);
 };
@@ -339,7 +339,9 @@ intel_hdmi_detect(struct drm_connector *connector, bool force)
        if (edid) {
                if (edid->input & DRM_EDID_INPUT_DIGITAL) {
                        status = connector_status_connected;
-                       intel_hdmi->has_hdmi_sink = drm_detect_hdmi_monitor(edid);
+                       if (intel_hdmi->force_audio != HDMI_AUDIO_OFF_DVI)
+                               intel_hdmi->has_hdmi_sink =
+                                               drm_detect_hdmi_monitor(edid);
                        intel_hdmi->has_audio = drm_detect_monitor_audio(edid);
                }
                connector->display_info.raw_edid = NULL;
@@ -347,8 +349,9 @@ intel_hdmi_detect(struct drm_connector *connector, bool force)
        }
 
        if (status == connector_status_connected) {
-               if (intel_hdmi->force_audio)
-                       intel_hdmi->has_audio = intel_hdmi->force_audio > 0;
+               if (intel_hdmi->force_audio != HDMI_AUDIO_AUTO)
+                       intel_hdmi->has_audio =
+                               (intel_hdmi->force_audio == HDMI_AUDIO_ON);
        }
 
        return status;
@@ -402,7 +405,7 @@ intel_hdmi_set_property(struct drm_connector *connector,
                return ret;
 
        if (property == dev_priv->force_audio_property) {
-               int i = val;
+               enum hdmi_force_audio i = val;
                bool has_audio;
 
                if (i == intel_hdmi->force_audio)
@@ -410,13 +413,13 @@ intel_hdmi_set_property(struct drm_connector *connector,
 
                intel_hdmi->force_audio = i;
 
-               if (i == 0)
+               if (i == HDMI_AUDIO_AUTO)
                        has_audio = intel_hdmi_detect_audio(connector);
                else
-                       has_audio = i > 0;
+                       has_audio = (i == HDMI_AUDIO_ON);
 
-               if (has_audio == intel_hdmi->has_audio)
-                       return 0;
+               if (i == HDMI_AUDIO_OFF_DVI)
+                       intel_hdmi->has_hdmi_sink = 0;
 
                intel_hdmi->has_audio = has_audio;
                goto done;

diff --git a/drivers/gpu/drm/i915/intel_modes.c b/drivers/gpu/drm/i915/intel_modes.c
index be2c6fe..7be4616 100644 (file)
--- a/drivers/gpu/drm/i915/intel_modes.c
+++ b/drivers/gpu/drm/i915/intel_modes.c
@@ -84,6 +84,7 @@ int intel_ddc_get_modes(struct drm_connector *connector,
 }
 
 static const char *force_audio_names[] = {
+       "force-dvi",
        "off",
        "auto",
        "on",
@@ -106,7 +107,8 @@ intel_attach_force_audio_property(struct drm_connector *connector)
                        return;
 
                for (i = 0; i < ARRAY_SIZE(force_audio_names); i++)
-                       drm_property_add_enum(prop, i, i-1, force_audio_names[i]);
+                       drm_property_add_enum(prop, i, i-2,
+                                             force_audio_names[i]);
 
                dev_priv->force_audio_property = prop;
        }