linux-kernel - [PATCH 3.16 016/132] drm/fb-helper: dpms_legacy(): Only set on connectors in use

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Message-ID: <lsq.1568989415.173739634@decadent.org.uk>
Date:   Fri, 20 Sep 2019 15:23:35 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Noralf Trønnes" <noralf@...nnes.org>,
        "Daniel Vetter" <daniel.vetter@...ll.ch>
Subject: [PATCH 3.16 016/132] drm/fb-helper: dpms_legacy(): Only set on
 connectors in use

3.16.74-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Noralf Trønnes <noralf@...nnes.org>

commit 65a102f68005891d7f39354cfd79099908df6d51 upstream.

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@...nnes.org>
Fixes: 023eb571a1d0 ("drm: correctly update connector DPMS status in drm_fb_helper")
Reviewed-by: Daniel Vetter <daniel.vetter@...ll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20190326175546.18126-3-noralf@tronnes.org
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/gpu/drm/drm_fb_helper.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -453,8 +453,8 @@ static void drm_fb_helper_dpms(struct fb
 {
 	struct drm_fb_helper *fb_helper = info->par;
 	struct drm_device *dev = fb_helper->dev;
-	struct drm_crtc *crtc;
 	struct drm_connector *connector;
+	struct drm_mode_set *modeset;
 	int i, j;
 
 	/*
@@ -475,14 +475,13 @@ static void drm_fb_helper_dpms(struct fb
 	}
 
 	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 */
-		for (j = 0; j < fb_helper->connector_count; 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);