linux-kernel - [PATCH 3.16.y-ckt 031/168] drm/i915: Kick fbdev before vgacon

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Date:	Mon, 15 Dec 2014 14:24:45 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Daniel Vetter <daniel.vetter@...el.com>,
	Jani Nikula <jani.nikula@...el.com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 031/168] drm/i915: Kick fbdev before vgacon

3.16.7-ckt3 -stable review patch.  If anyone has any objections, please let me know.

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

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

commit 0485c9dc24ec0939b42ca5104c0373297506b555 upstream.

It's magic, but it seems to work.

This fixes a regression introduced in

commit 1bb9e632a0aeee1121e652ee4dc80e5e6f14bcd2
Author: Daniel Vetter <daniel.vetter@...ll.ch>
Date:   Tue Jul 8 10:02:43 2014 +0200

    drm/i915: Only unbind vgacon, not other console drivers

My best guess is that the vga fbdev driver falls over if we rip out
parts of vgacon. Hooray.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=82439
Reported-and-tested-by: Lv Zheng <lv.zheng@...el.com>
Signed-off-by: Daniel Vetter <daniel.vetter@...el.com>
Acked-by: Chris Wilson <chris@...is-wilson.co.uk>
Signed-off-by: Jani Nikula <jani.nikula@...el.com>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/gpu/drm/i915/i915_dma.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 0663fb4fa606..646b68a58979 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1662,15 +1662,17 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
 		goto out_regs;
 
 	if (drm_core_check_feature(dev, DRIVER_MODESET)) {
-		ret = i915_kick_out_vgacon(dev_priv);
+		/* WARNING: Apparently we must kick fbdev drivers before vgacon,
+		 * otherwise the vga fbdev driver falls over. */
+		ret = i915_kick_out_firmware_fb(dev_priv);
 		if (ret) {
-			DRM_ERROR("failed to remove conflicting VGA console\n");
+			DRM_ERROR("failed to remove conflicting framebuffer drivers\n");
 			goto out_gtt;
 		}
 
-		ret = i915_kick_out_firmware_fb(dev_priv);
+		ret = i915_kick_out_vgacon(dev_priv);
 		if (ret) {
-			DRM_ERROR("failed to remove conflicting framebuffer drivers\n");
+			DRM_ERROR("failed to remove conflicting VGA console\n");
 			goto out_gtt;
 		}
 	}
-- 
2.1.3

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