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drm/radeon/kms: fix dp_detect handling for DP bridge chips

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The HPD pin is not reliable for detecting whether a monitor
is connected or not.  Skip HPD and just use DDC or load
detection.

Fixes phantom VGA connected bugs.

[Michel: fixes phantom VGA bugs on his llano system.]

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Tested-by: Michel Dänzer <michel.daenzer@amd.com>
Cc: stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Alex Deucher 2011-10-04 12:23:24 -04:00 committed by Dave Airlie
parent 4f332844cc
commit 6777a4f689
1 changed files with 6 additions and 15 deletions
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21
drivers/gpu/drm/radeon/radeon_connectors.c
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@ -1303,23 +1303,14 @@ radeon_dp_detect(struct drm_connector *connector, bool force)
/* get the DPCD from the bridge */
radeon_dp_getdpcd(radeon_connector);
if (radeon_hpd_sense(rdev, radeon_connector->hpd.hpd))
ret = connector_status_connected;
else {
/* need to setup ddc on the bridge */
if (encoder)
radeon_atom_ext_encoder_setup_ddc(encoder);
if (encoder) {
/* setup ddc on the bridge */
radeon_atom_ext_encoder_setup_ddc(encoder);
if (radeon_ddc_probe(radeon_connector,
radeon_connector->requires_extended_probe))
radeon_connector->requires_extended_probe)) /* try DDC */
ret = connector_status_connected;
}
if ((ret == connector_status_disconnected) &&
radeon_connector->dac_load_detect) {
struct drm_encoder *encoder = radeon_best_single_encoder(connector);
struct drm_encoder_helper_funcs *encoder_funcs;
if (encoder) {
encoder_funcs = encoder->helper_private;
else if (radeon_connector->dac_load_detect) { /* try load detection */
struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
ret = encoder_funcs->detect(encoder, connector);
}
}