drm/i915: always update ELD connector type after get modes

drm_edid_to_eld() initializes the connector ELD to zero, overwriting the
ELD connector type initialized in intel_audio_codec_enable(). If
userspace does getconnector and thus get_modes after modeset, a
subsequent audio component i915_audio_component_get_eld() call will
receive an ELD without the connector type properly set. It's fine for
HDMI, but screws up audio for DP.

Always set the ELD connector type at intel_connector_update_modes()
based on the connector type. We can drop the connector type update from
intel_audio_codec_enable().

Credits to Joseph Nuzman <jnuzman@gmail.com> for figuring this out.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Joseph Nuzman <jnuzman@gmail.com>
Reported-by: Joseph Nuzman <jnuzman@gmail.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101583
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Tested-by: Joseph Nuzman <jnuzman@gmail.com>
Cc: stable@vger.kernel.org # v4.10+, maybe earlier
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170919153813.29808-1-jani.nikula@intel.com
(cherry picked from commit d81fb7fd9436e81fda67e5bc8ed0713aa28d3db2)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

diff --git a/drivers/gpu/drm/i915/intel_audio.c b/drivers/gpu/drm/i915/intel_audio.c
index d805b6e6fe71467ed4f9a85a74fdba1b5ed81998..27743be5b768e13c4be9749537b1af76dfb3f478 100644 (file)
--- a/drivers/gpu/drm/i915/intel_audio.c
+++ b/drivers/gpu/drm/i915/intel_audio.c
@@ -606,11 +606,6 @@ void intel_audio_codec_enable(struct intel_encoder *intel_encoder,
                         connector->encoder->base.id,
                         connector->encoder->name);
 
-       /* ELD Conn_Type */
-       connector->eld[5] &= ~(3 << 2);
-       if (intel_crtc_has_dp_encoder(crtc_state))
-               connector->eld[5] |= (1 << 2);
-
        connector->eld[6] = drm_av_sync_delay(connector, adjusted_mode) / 2;
 
        if (dev_priv->display.audio_codec_enable)

diff --git a/drivers/gpu/drm/i915/intel_modes.c b/drivers/gpu/drm/i915/intel_modes.c
index 951e834dd2744f7f2fe84a54723136f743d185cf..28a778b785ac9e02ea7de55878e5fec98f019b98 100644 (file)
--- a/drivers/gpu/drm/i915/intel_modes.c
+++ b/drivers/gpu/drm/i915/intel_modes.c
@@ -30,6 +30,21 @@
 #include "intel_drv.h"
 #include "i915_drv.h"
 
+static void intel_connector_update_eld_conn_type(struct drm_connector *connector)
+{
+       u8 conn_type;
+
+       if (connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort ||
+           connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
+               conn_type = DRM_ELD_CONN_TYPE_DP;
+       } else {
+               conn_type = DRM_ELD_CONN_TYPE_HDMI;
+       }
+
+       connector->eld[DRM_ELD_SAD_COUNT_CONN_TYPE] &= ~DRM_ELD_CONN_TYPE_MASK;
+       connector->eld[DRM_ELD_SAD_COUNT_CONN_TYPE] |= conn_type;
+}
+
 /**
  * intel_connector_update_modes - update connector from edid
  * @connector: DRM connector device to use
@@ -44,6 +59,8 @@ int intel_connector_update_modes(struct drm_connector *connector,
        ret = drm_add_edid_modes(connector, edid);
        drm_edid_to_eld(connector, edid);
 
+       intel_connector_update_eld_conn_type(connector);
+
        return ret;
 }