drm/radeon/kms: fix eDP panel power function

need to wait for the panel to power up.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

2 files changed, 20 insertions, 6 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_encoders.c b/drivers/gpu/drm/radeon/radeon_encoders.c
index 49fcd60b849d..cdac73975f6e 100644
--- a/drivers/gpu/drm/radeon/radeon_encoders.c
+++ b/drivers/gpu/drm/radeon/radeon_encoders.c
@@ -1095,7 +1095,7 @@ atombios_dig_transmitter_setup(struct drm_encoder *encoder, int action, uint8_t
         atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
 }
 
-void
+bool
 atombios_set_edp_panel_power(struct drm_connector *connector, int action)
 {
         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
@@ -1106,23 +1106,37 @@ atombios_set_edp_panel_power(struct drm_connector *connector, int action)
         uint8_t frev, crev;
 
         if (connector->connector_type != DRM_MODE_CONNECTOR_eDP)
-                return;
+                goto done;
 
         if (!ASIC_IS_DCE4(rdev))
-                return;
+                goto done;
 
         if ((action != ATOM_TRANSMITTER_ACTION_POWER_ON) &&
             (action != ATOM_TRANSMITTER_ACTION_POWER_OFF))
-                return;
+                goto done;
 
         if (!atom_parse_cmd_header(rdev->mode_info.atom_context, index, &frev, &crev))
-                return;
+                goto done;
 
         memset(&args, 0, sizeof(args));
 
         args.v1.ucAction = action;
 
         atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
+
+        /* wait for the panel to power up */
+        if (action == ATOM_TRANSMITTER_ACTION_POWER_ON) {
+                int i;
+
+                for (i = 0; i < 300; i++) {
+                        if (radeon_hpd_sense(rdev, radeon_connector->hpd.hpd))
+                                return true;
+                        mdelay(1);
+                }
+                return false;
+        }
+done:
+        return true;
 }
 
 union external_encoder_control {
diff --git a/drivers/gpu/drm/radeon/radeon_mode.h b/drivers/gpu/drm/radeon/radeon_mode.h
index 9c57538231d5..e4d32373c630 100644
--- a/drivers/gpu/drm/radeon/radeon_mode.h
+++ b/drivers/gpu/drm/radeon/radeon_mode.h
@@ -545,7 +545,7 @@ struct drm_encoder *radeon_encoder_legacy_tmds_ext_add(struct drm_device *dev, i
 extern void atombios_dvo_setup(struct drm_encoder *encoder, int action);
 extern void atombios_digital_setup(struct drm_encoder *encoder, int action);
 extern int atombios_get_encoder_mode(struct drm_encoder *encoder);
-extern void atombios_set_edp_panel_power(struct drm_connector *connector, int action);
+extern bool atombios_set_edp_panel_power(struct drm_connector *connector, int action);
 extern void radeon_encoder_set_active_device(struct drm_encoder *encoder);
 
 extern void radeon_crtc_load_lut(struct drm_crtc *crtc);