From 65a102f68005891d7f39354cfd79099908df6d51 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org>
Date: Tue, 26 Mar 2019 18:55:32 +0100
Subject: [PATCH] drm/fb-helper: dpms_legacy(): Only set on connectors in use
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Git-commit: 65a102f68005891d7f39354cfd79099908df6d51
Patch-mainline: v5.2-rc1
References: bsc#1051510

For each enabled crtc the functions sets dpms on all registered connectors.
Limit this to only doing it once and on the connectors actually in use.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Fixes: 023eb571a1d0 ("drm: correctly update connector DPMS status in drm_fb_helper")
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20190326175546.18126-3-noralf@tronnes.org
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/drm_fb_helper.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index a6d88f8b7a52..0d8384e30e16 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -639,20 +639,19 @@ static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
 static void dpms_legacy(struct drm_fb_helper *fb_helper, int dpms_mode)
 {
 	struct drm_device *dev = fb_helper->dev;
-	struct drm_crtc *crtc;
 	struct drm_connector *connector;
+	struct drm_mode_set *modeset;
 	int i, j;
 
 	drm_modeset_lock_all(dev);
 	for (i = 0; i < fb_helper->crtc_count; i++) {
-		crtc = fb_helper->crtc_info[i].mode_set.crtc;
+		modeset = &fb_helper->crtc_info[i].mode_set;
 
-		if (!crtc->enabled)
+		if (!modeset->crtc->enabled)
 			continue;
 
-		/* Walk the connectors & encoders on this fb turning them on/off */
-		drm_fb_helper_for_each_connector(fb_helper, j) {
-			connector = fb_helper->connector_info[j]->connector;
+		for (j = 0; j < modeset->num_connectors; j++) {
+			connector = modeset->connectors[j];
 			connector->funcs->dpms(connector, dpms_mode);
 			drm_object_property_set_value(&connector->base,
 				dev->mode_config.dpms_property, dpms_mode);
-- 
2.16.4