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DRM/Radeon: On DVI-I use Load Detection when EDID is bogus. 

The Radeon driver uses the analog/digital flag to determine if the
DAC or the TMDS encoder should be enabled on a DVI-I connector.
If the EDID is bogus this flag is no longer reliable. This fix
adds a fallback to DAC load detection to determine if anything
is connected to the DAC. If not and a (bogus) EDID is found it
assumes a digital display is connected.
This works around problems with some crappy IPMI devices using
Radeon ES1000.

Signed-off-by: Egbert Eich <eich@suse.de>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Egbert Eich 2012-10-24 18:32:52 +02:00 committed by Alex Deucher
parent 9c50b1d937
commit fc87f13b8d
1 changed files with 21 additions and 7 deletions
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28
drivers/gpu/drm/radeon/radeon_connectors.c
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@ -941,7 +941,7 @@ radeon_dvi_detect(struct drm_connector *connector, bool force)
struct drm_mode_object *obj;
int i;
enum drm_connector_status ret = connector_status_disconnected;
bool dret = false;
bool dret = false, broken_edid = false;
if (!force && radeon_check_hpd_status_unchanged(connector))
return connector->status;
@ -965,6 +965,9 @@ radeon_dvi_detect(struct drm_connector *connector, bool force)
ret = connector_status_disconnected;
DRM_ERROR("%s: detected RS690 floating bus bug, stopping ddc detect\n", drm_get_connector_name(connector));
radeon_connector->ddc_bus = NULL;
} else {
ret = connector_status_connected;
broken_edid = true; /* defer use_digital to later */
}
} else {
radeon_connector->use_digital = !!(radeon_connector->edid->input & DRM_EDID_INPUT_DIGITAL);
@ -1047,13 +1050,24 @@ radeon_dvi_detect(struct drm_connector *connector, bool force)
encoder_funcs = encoder->helper_private;
if (encoder_funcs->detect) {
if (ret != connector_status_connected) {
ret = encoder_funcs->detect(encoder, connector);
if (ret == connector_status_connected) {
radeon_connector->use_digital = false;
if (!broken_edid) {
if (ret != connector_status_connected) {
/* deal with analog monitors without DDC */
ret = encoder_funcs->detect(encoder, connector);
if (ret == connector_status_connected) {
radeon_connector->use_digital = false;
}
if (ret != connector_status_disconnected)
radeon_connector->detected_by_load = true;
}
if (ret != connector_status_disconnected)
radeon_connector->detected_by_load = true;
} else {
enum drm_connector_status lret;
/* assume digital unless load detected otherwise */
radeon_connector->use_digital = true;
lret = encoder_funcs->detect(encoder, connector);
DRM_DEBUG_KMS("load_detect %x returned: %x\n",encoder->encoder_type,lret);
if (lret == connector_status_connected)
radeon_connector->use_digital = false;
}
break;
}