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From: Liviu Dudau <Liviu.Dudau@arm.com>
To: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Intel Graphics Development <intel-gfx@lists.freedesktop.org>,
	DRI Development <dri-devel@lists.freedesktop.org>,
	John Stultz <john.stultz@linaro.org>,
	Thierry Reding <treding@nvidia.com>
Subject: [PATCH] drm/fb-helper: Restore first connection behaviour on deferred setup
Date: Fri, 30 Jun 2017 17:51:55 +0100	[thread overview]
Message-ID: <20170630165155.8658-1-Liviu.Dudau@arm.com> (raw)
In-Reply-To: <20170628113201.27383-1-daniel.vetter@ffwll.ch>

Prior to commit b0aa06e9a7fd ("drm/fb-helper: Support deferred setup"),
if no output is connected at framebuffer setup time, we get a default
1024x768 mode that is going to be used when we first connect a monitor.
After the commit, on first connection after deferred setup, we probe
the monitor and get the preferred resolution, but no mode get set
because the drm_fb_helper_hotplug_event() function returns early
when the setup has been deferred. That is different from what happens
on a second re-connect of the monitor, when the native mode get set.

Create a more consistent behaviour by checking in the
drm_fb_helper_hotplug_event() function if the deferred setup is still
active. If not, that means we now have a valid framebuffer that can be
used for setting the correct mode.

Fixes: b0aa06e9a7fd ("drm/fb-helper: Support deferred setup")
Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/drm_fb_helper.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index d833eb2320d1..bb7b44d284ec 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -2444,6 +2444,7 @@ static int __drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper,
 		if (ret == -EAGAIN) {
 			fb_helper->preferred_bpp = bpp_sel;
 			fb_helper->deferred_setup = true;
+			ret = 0;
 		}
 		mutex_unlock(&fb_helper->lock);
 
@@ -2565,7 +2566,13 @@ int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
 	if (fb_helper->deferred_setup) {
 		err = __drm_fb_helper_initial_config(fb_helper,
 						     fb_helper->preferred_bpp);
-		return err;
+		/*
+		 * __drm_fb_helper_initial_config can change deferred_setup,
+		 * if 'false' that means we can go ahead with the rest of
+		 * the setup as normal
+		 */
+		if (fb_helper->deferred_setup)
+			return err;
 	}
 
 	if (!fb_helper->fb || !drm_fb_helper_is_bound(fb_helper)) {
-- 
2.13.1

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  parent reply	other threads:[~2017-06-30 16:51 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-27 14:59 [PATCH 00/13] fbdev locking rework and deferred setup, take 2 Daniel Vetter
2017-06-27 14:59 ` [PATCH 01/13] drm/fb-helper: Push down modeset lock into FB helpers Daniel Vetter
2017-06-29  9:10   ` Maarten Lankhorst
2017-06-29  9:23     ` Daniel Vetter
2017-06-29  9:33       ` Maarten Lankhorst
2017-06-29  9:44         ` Daniel Vetter
2017-06-29 11:13           ` Maarten Lankhorst
2017-06-29 12:38             ` Daniel Vetter
2017-06-27 14:59 ` [PATCH 02/13] drm/i915: Drop FBDEV #ifdev in mst code Daniel Vetter
2017-06-27 14:59 ` [PATCH 03/13] drm/fb-helper: Add top-level lock Daniel Vetter
2017-06-27 14:59 ` [PATCH 04/13] drm/fb-helper: Push locking in fb_is_bound Daniel Vetter
2017-06-27 14:59 ` [PATCH 05/13] drm/fb-helper: Drop locking from the vsync wait ioctl code Daniel Vetter
2017-06-27 14:59 ` [PATCH 06/13] drm/fb-helper: Push locking into pan_display_atomic|legacy Daniel Vetter
2017-06-27 14:59 ` [PATCH 07/13] drm/fb-helper: Push locking into restore_fbdev_mode_atomic|legacy Daniel Vetter
2017-06-27 14:59 ` [PATCH 08/13] drm/fb-helper: Stop using mode_config.mutex for internals Daniel Vetter
2017-06-27 14:59 ` [PATCH 09/13] drm/fb-helper: Split dpms handling into legacy and atomic paths Daniel Vetter
2017-06-29 10:22   ` Maarten Lankhorst
2017-06-29 10:31     ` Daniel Vetter
2017-06-29 10:58       ` Maarten Lankhorst
2017-06-29 11:00         ` Daniel Vetter
2017-06-29 11:23           ` Maarten Lankhorst
2017-06-27 14:59 ` [PATCH 10/13] drm/fb-helper: Support deferred setup Daniel Vetter
2017-06-28 11:32   ` [PATCH] " Daniel Vetter
2017-06-28 16:24     ` Liviu Dudau
2017-06-29 10:59     ` Maarten Lankhorst
2017-06-29 12:36       ` Daniel Vetter
2017-06-30 16:51     ` Liviu Dudau [this message]
2017-06-30 18:13       ` [PATCH] drm/fb-helper: Restore first connection behaviour on " Daniel Vetter
2017-07-03  8:44         ` Liviu Dudau
2017-07-03 16:33           ` Daniel Vetter
2017-06-27 14:59 ` [PATCH 11/13] drm/exynos: Remove custom FB helper " Daniel Vetter
2017-06-27 14:59 ` [PATCH 12/13] drm/hisilicon: " Daniel Vetter
2017-06-28  9:08   ` [PATCH] " Daniel Vetter
2017-06-27 14:59 ` [PATCH 13/13] drm/atomic-helper: Realign function parameters Daniel Vetter
2017-06-27 15:01   ` Deucher, Alexander
2017-06-27 15:42   ` Harry Wentland
2017-07-04 15:16     ` Daniel Vetter
2017-06-27 15:30 ` ✓ Fi.CI.BAT: success for fbdev locking rework and deferred setup, take 2 Patchwork
2017-06-27 23:02 ` [PATCH 00/13] " John Stultz
2017-06-28  7:36   ` Daniel Vetter
2017-06-28  9:28 ` ✓ Fi.CI.BAT: success for fbdev locking rework and deferred setup, take 2 (rev2) Patchwork
2017-06-28 12:28 ` ✓ Fi.CI.BAT: success for fbdev locking rework and deferred setup, take 2 (rev3) Patchwork

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