Commit 42f14c4b authored by Alex Deucher's avatar Alex Deucher Committed by Dave Airlie
Browse files

drm/radeon/kms: fix shared ddc harder

This fixes a regression caused by b2ea4aa6


due to the way shared ddc with multiple digital connectors was handled.

You generally have two cases where DDC lines are shared:
- HDMI + VGA
- HDMI + DVI-D

HDMI + VGA is easy to deal with because you can check the EDID for the
to see if the attached monitor is digital.  A shared DDC line with two
digital connectors is more complex.  You can't use the hdmi bits in the
EDID since they may not be there with DVI<->HDMI adapters.  In this case
all we can do is check the HPD pins to see which is connected as we have
no way of knowing using the EDID.

Reported-by: trapdoor6@gmail.com
Signed-off-by: Alex Deucher's avatarAlex Deucher <alexdeucher@gmail.com>
Cc: stable@kernel.org
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent 94400120
......@@ -771,14 +771,14 @@ static enum drm_connector_status radeon_dvi_detect(struct drm_connector *connect
} else
ret = connector_status_connected;
/* multiple connectors on the same encoder with the same ddc line
* This tends to be HDMI and DVI on the same encoder with the
* same ddc line. If the edid says HDMI, consider the HDMI port
* connected and the DVI port disconnected. If the edid doesn't
* say HDMI, vice versa.
/* This gets complicated. We have boards with VGA + HDMI with a
* shared DDC line and we have boards with DVI-D + HDMI with a shared
* DDC line. The latter is more complex because with DVI<->HDMI adapters
* you don't really know what's connected to which port as both are digital.
*/
if (radeon_connector->shared_ddc && (ret == connector_status_connected)) {
struct drm_device *dev = connector->dev;
struct radeon_device *rdev = dev->dev_private;
struct drm_connector *list_connector;
struct radeon_connector *list_radeon_connector;
list_for_each_entry(list_connector, &dev->mode_config.connector_list, head) {
......@@ -788,15 +788,10 @@ static enum drm_connector_status radeon_dvi_detect(struct drm_connector *connect
if (list_radeon_connector->shared_ddc &&
(list_radeon_connector->ddc_bus->rec.i2c_id ==
radeon_connector->ddc_bus->rec.i2c_id)) {
if (drm_detect_hdmi_monitor(radeon_connector->edid)) {
if (connector->connector_type == DRM_MODE_CONNECTOR_DVID) {
kfree(radeon_connector->edid);
radeon_connector->edid = NULL;
ret = connector_status_disconnected;
}
} else {
if ((connector->connector_type == DRM_MODE_CONNECTOR_HDMIA) ||
(connector->connector_type == DRM_MODE_CONNECTOR_HDMIB)) {
/* cases where both connectors are digital */
if (list_connector->connector_type != DRM_MODE_CONNECTOR_VGA) {
/* hpd is our only option in this case */
if (!radeon_hpd_sense(rdev, radeon_connector->hpd.hpd)) {
kfree(radeon_connector->edid);
radeon_connector->edid = NULL;
ret = connector_status_disconnected;
......
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