drm/i915: Remove high level intel_edp_vdd_{on, off}() from hpd/detect

want_panel_vdd is a bool so it can't cope with interleaving on/off calls
from multiple threads. If we want to make that possible we'd need to
convert want_panel_vdd into a proper ref count. But an easier fix is to
remove the high level vdd on/off calls from detect/hpd code paths and
just rely on the delayed vdd off to avoid needless vdd on<->off ping
pong.

After this change only the encoder enable/disable paths use the high
level functions, which is fine since both the on and off low level edp
vdd calls from intel_dp_aux_ch() happen without dropping pps_mutex in
between and so want_panel_vdd can't change in between.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 3f18580..9076e9a 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -3846,8 +3846,6 @@ intel_dp_probe_oui(struct intel_dp *intel_dp)
        if (!(intel_dp->dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_OUI_SUPPORT))
                return;
 
-       intel_edp_panel_vdd_on(intel_dp);
-
        if (intel_dp_dpcd_read_wake(&intel_dp->aux, DP_SINK_OUI, buf, 3) == 3)
                DRM_DEBUG_KMS("Sink OUI: %02hx%02hx%02hx\n",
                              buf[0], buf[1], buf[2]);
@@ -3855,8 +3853,6 @@ intel_dp_probe_oui(struct intel_dp *intel_dp)
        if (intel_dp_dpcd_read_wake(&intel_dp->aux, DP_BRANCH_OUI, buf, 3) == 3)
                DRM_DEBUG_KMS("Branch OUI: %02hx%02hx%02hx\n",
                              buf[0], buf[1], buf[2]);
-
-       intel_edp_panel_vdd_off(intel_dp, false);
 }
 
 static bool
@@ -3870,7 +3866,6 @@ intel_dp_probe_mst(struct intel_dp *intel_dp)
        if (intel_dp->dpcd[DP_DPCD_REV] < 0x12)
                return false;
 
-       intel_edp_panel_vdd_on(intel_dp);
        if (intel_dp_dpcd_read_wake(&intel_dp->aux, DP_MSTM_CAP, buf, 1)) {
                if (buf[0] & DP_MST_CAP) {
                        DRM_DEBUG_KMS("Sink is MST capable\n");
@@ -3880,7 +3875,6 @@ intel_dp_probe_mst(struct intel_dp *intel_dp)
                        intel_dp->is_mst = false;
                }
        }
-       intel_edp_panel_vdd_off(intel_dp, false);
 
        drm_dp_mst_topology_mgr_set_mst(&intel_dp->mst_mgr, intel_dp->is_mst);
        return intel_dp->is_mst;
@@ -5086,9 +5080,7 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp,
        intel_edp_panel_vdd_sanitize(intel_encoder);
 
        /* Cache DPCD and EDID for edp. */
-       intel_edp_panel_vdd_on(intel_dp);
        has_dpcd = intel_dp_get_dpcd(intel_dp);
-       intel_edp_panel_vdd_off(intel_dp, false);
 
        if (has_dpcd) {
                if (intel_dp->dpcd[DP_DPCD_REV] >= 0x11)