linux-kernel - [PATCH 3.19.y-ckt 030/130] drm: Stop resetting connector state to unknown

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Message-Id: <1440713521-5906-31-git-send-email-kamal@canonical.com>
Date:	Thu, 27 Aug 2015 15:10:21 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Rui Matos <tiagomatos@...il.com>,
	Julien Wajsberg <felash@...il.com>, kuddel.mail@....de,
	Lennart Poettering <mzxreary@...inter.de>,
	Daniel Vetter <daniel.vetter@...el.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 030/130] drm: Stop resetting connector state to unknown

3.19.8-ckt6 -stable review patch.  If anyone has any objections, please let me know.

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

From: Daniel Vetter <daniel.vetter@...ll.ch>

commit 5677d67ae3949f09f57357241b88222d49b8c782 upstream.

It's causing piles of issues since we've stopped forcing full detect
cycles in the sysfs interfaces with

commit c484f02d0f02fbbfc6decc945a69aae011041a27
Author: Chris Wilson <chris@...is-wilson.co.uk>
Date:   Fri Mar 6 12:36:42 2015 +0000

    drm: Lighten sysfs connector 'status'

The original justification for this was that the hpd handlers could
use the unknown state as a hint to force a full detection. But current
i915 code isn't doing that any more, and no one else really uses reset
on resume. So instead just keep the old state around.

References: http://article.gmane.org/gmane.comp.freedesktop.xorg.drivers.intel/62584
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=100641
Cc: Rui Matos <tiagomatos@...il.com>
Cc: Julien Wajsberg <felash@...il.com>
Cc: kuddel.mail@....de
Cc: Lennart Poettering <mzxreary@...inter.de>
Acked-by: Rob Clark <robdclark@...il.com>
Tested-by: Rui Tiago Cação Matos <tiagomatos@...il.com>
Signed-off-by: Daniel Vetter <daniel.vetter@...el.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/gpu/drm/drm_crtc.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index acb6e90..2d06f91 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -4821,12 +4821,9 @@ void drm_mode_config_reset(struct drm_device *dev)
 		if (encoder->funcs->reset)
 			encoder->funcs->reset(encoder);
 
-	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
-		connector->status = connector_status_unknown;
-
+	list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 		if (connector->funcs->reset)
 			connector->funcs->reset(connector);
-	}
 }
 EXPORT_SYMBOL(drm_mode_config_reset);
 
-- 
1.9.1

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