[PATCH] drm: Call sysfs_notify after changing drm_connector::dpms

[Karsten Wiese <fzuuzf@xxxxxxxxxxxxxx>]

This makes poll work for the
/sys/class/drm/cardX/connectorY/dpms attributes.

Tested with i915 suspended by XScreenServer and
suspend to RAM.

Signed-off-by: Karsten Wiese <fzuuzf@xxxxxxxxxxxxxx>
---
 drivers/gpu/drm/drm_atomic.c        | 4 ++++
 drivers/gpu/drm/drm_atomic_helper.c | 6 +++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 2fd383d..b6fa87b 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -1880,6 +1880,10 @@ int drm_atomic_connector_commit_dpms(struct drm_atomic_state *state,
 out:
 	if (ret != 0)
 		connector->dpms = old_mode;
+	else
+		if (connector->dpms != old_mode)
+			sysfs_notify(&connector->kdev->kobj, NULL, "dpms");
+
 	return ret;
 }
 
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 4e53aae..6198772 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -921,12 +921,16 @@ drm_atomic_helper_update_legacy_modeset_state(struct drm_device *dev,
 		crtc = new_conn_state->crtc;
 		if ((!crtc && old_conn_state->crtc) ||
 		    (crtc && drm_atomic_crtc_needs_modeset(crtc->state))) {
-			int mode = DRM_MODE_DPMS_OFF;
+			int old_mode, mode = DRM_MODE_DPMS_OFF;
 
 			if (crtc && crtc->state->active)
 				mode = DRM_MODE_DPMS_ON;
 
+			old_mode = connector->dpms;
 			connector->dpms = mode;
+			if (old_mode != mode)
+				sysfs_notify(&connector->kdev->kobj,
+						NULL, "dpms");
 		}
 	}
 
-- 
2.7.4

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