[PATCH AUTOSEL for 4.4 084/115] drm/edid: set ELD connector type in drm_edid_to_eld()

[Sasha Levin]

From: Jani Nikula <jani.nikula@xxxxxxxxx>

[ Upstream commit 1d1c36650752b7fb81cee515a9bba4131cac4b7c ]

Since drm_edid_to_eld() knows the connector type, we can set the type in
ELD while at it. Most connectors this gets called on are not DP
encoders, and with the HDMI type being 0, this does not change behaviour
for non-DP.

For i915 having this in place earlier would have saved a considerable
amount of debugging that lead to the fix 2d8f63297b9f ("drm/i915: always
update ELD connector type after get modes"). I don't see other drivers,
even the ones calling drm_edid_to_eld() on DP connectors, setting the
connector type in ELD.

Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: Christian KÃnig <christian.koenig@xxxxxxx>
Cc: Archit Taneja <architt@xxxxxxxxxxxxxx>
Cc: Andrzej Hajda <a.hajda@xxxxxxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxx>
Cc: CK Hu <ck.hu@xxxxxxxxxxxx>
Cc: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
Cc: Ben Skeggs <bskeggs@xxxxxxxxxx>
Cc: Mark Yao <mark.yao@xxxxxxxxxxxxxx>
Cc: Benjamin Gaignard <benjamin.gaignard@xxxxxxxxxx>
Cc: Vincent Abriou <vincent.abriou@xxxxxx>
Cc: Thierry Reding <thierry.reding@xxxxxxxxx>
Cc: Eric Anholt <eric@xxxxxxxxxx>
Reviewed-by: Ville SyrjÃlà <ville.syrjala@xxxxxxxxxxxxxxx>
Reviewed-by: Alex Deucher <alexander.deucher@xxxxxxx>
Acked-by: Thierry Reding <treding@xxxxxxxxxx>
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/d527b31619528c477c2c136f25cdf118bc0cfc1d.1509545641.git.jani.nikula@xxxxxxxxx
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
---
 drivers/gpu/drm/drm_edid.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index c641ed9470e1..724f7cf52253 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -3219,8 +3219,7 @@ monitor_name(struct detailed_timing *t, void *data)
  * @edid: EDID to parse
  *
  * Fill the ELD (EDID-Like Data) buffer for passing to the audio driver. The
- * Conn_Type, HDCP and Port_ID ELD fields are left for the graphics driver to
- * fill in.
+ * HDCP and Port_ID ELD fields are left for the graphics driver to fill in.
  */
 void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid)
 {
@@ -3293,6 +3292,12 @@ void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid)
 	}
 	eld[5] |= sad_count << 4;
 
+	if (connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort ||
+	    connector->connector_type == DRM_MODE_CONNECTOR_eDP)
+		eld[DRM_ELD_SAD_COUNT_CONN_TYPE] |= DRM_ELD_CONN_TYPE_DP;
+	else
+		eld[DRM_ELD_SAD_COUNT_CONN_TYPE] |= DRM_ELD_CONN_TYPE_HDMI;
+
 	eld[DRM_ELD_BASELINE_ELD_LEN] =
 		DIV_ROUND_UP(drm_eld_calc_baseline_block_size(eld), 4);
 
-- 
2.14.1