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drm/radeon/mst: fix regression in lane/link handling.

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The function this used changed in
    092c96a8ab
    drm/radeon: fix dp link rate selection (v2)

However for MST we should just always train to the
max link/rate. Though we probably need to limit this
for future hw, in theory radeon won't support it.

This fixes my 30" monitor with MST enabled.

Cc: stable@vger.kernel.org # v4.4
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Dave Airlie 2016-03-22 09:38:18 +10:00 committed by Alex Deucher
parent ae20f12d2d
commit b36f7d26a7
1 changed files with 2 additions and 10 deletions
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12
drivers/gpu/drm/radeon/radeon_dp_mst.c
View file

@ -525,17 +525,9 @@ static bool radeon_mst_mode_fixup(struct drm_encoder *encoder,
drm_mode_set_crtcinfo(adjusted_mode, 0);
{
struct radeon_connector_atom_dig *dig_connector;
int ret;
dig_connector = mst_enc->connector->con_priv;
ret = radeon_dp_get_dp_link_config(&mst_enc->connector->base,
dig_connector->dpcd, adjusted_mode->clock,
&dig_connector->dp_lane_count,
&dig_connector->dp_clock);
if (ret) {
dig_connector->dp_lane_count = 0;
dig_connector->dp_clock = 0;
}
dig_connector->dp_lane_count = drm_dp_max_lane_count(dig_connector->dpcd);
dig_connector->dp_clock = drm_dp_max_link_rate(dig_connector->dpcd);
DRM_DEBUG_KMS("dig clock %p %d %d\n", dig_connector,
dig_connector->dp_lane_count, dig_connector->dp_clock);
}