linux-kernel - [PATCH AUTOSEL for 4.9 30/56] drm/atomic: Unconditionally call prepare

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Message-ID: <20171115024521.5884-30-alexander.levin@verizon.com>
Date:   Wed, 15 Nov 2017 02:45:42 +0000
From:   alexander.levin@...izon.com
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        alexander.levin@...izon.com
Subject: [PATCH AUTOSEL for 4.9 30/56] drm/atomic: Unconditionally call
 prepare_fb.

From: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>

[ Upstream commit 0532be078a207d7dd6ad26ebd0834e258acc4ee7 ]

Atomic drivers may set properties like rotation on the same fb, which
may require a call to prepare_fb even when framebuffer stays identical.

Instead of handling all the special cases in the core, let the driver
decide when prepare_fb and cleanup_fb are noops.

This is a revert of:

commit fcc60b413d14dd06ddbd79ec50e83c4fb2a097ba
Author: Keith Packard <keithp@...thp.com>
Date:   Sat Jun 4 01:16:22 2016 -0700

    drm: Don't prepare or cleanup unchanging frame buffers [v3]

The original commit mentions that this prevents waiting in i915 on all
previous rendering during cursor updates, but there are better ways to
fix this.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
Acked-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/6d82f9b6-9d16-91d1-d176-4a37b09afc44@linux.intel.com
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/gpu/drm/drm_atomic_helper.c | 9 ---------
 1 file changed, 9 deletions(-)

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 50acd799babe..462783c39878 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -1670,9 +1670,6 @@ int drm_atomic_helper_prepare_planes(struct drm_device *dev,
 
 		funcs = plane->helper_private;
 
-		if (!drm_atomic_helper_framebuffer_changed(dev, state, plane_state->crtc))
-			continue;
-
 		if (funcs->prepare_fb) {
 			ret = funcs->prepare_fb(plane, plane_state);
 			if (ret)
@@ -1689,9 +1686,6 @@ int drm_atomic_helper_prepare_planes(struct drm_device *dev,
 		if (j >= i)
 			continue;
 
-		if (!drm_atomic_helper_framebuffer_changed(dev, state, plane_state->crtc))
-			continue;
-
 		funcs = plane->helper_private;
 
 		if (funcs->cleanup_fb)
@@ -1958,9 +1952,6 @@ void drm_atomic_helper_cleanup_planes(struct drm_device *dev,
 	for_each_plane_in_state(old_state, plane, plane_state, i) {
 		const struct drm_plane_helper_funcs *funcs;
 
-		if (!drm_atomic_helper_framebuffer_changed(dev, old_state, plane_state->crtc))
-			continue;
-
 		funcs = plane->helper_private;
 
 		if (funcs->cleanup_fb)
-- 
2.11.0