[Intel-gfx] [PATCH] drm/fbdev: Make skip_vt_switch the default

Daniel Vetter daniel.vetter at ffwll.ch
Tue Nov 27 17:34:24 UTC 2018

KMS drivers really should all be able to restore their display state
on resume without fbcon helping out. So make this the default.

Since I'm not entirely foolish, make it only a default, which drivers
can still override. That way when the inevitable regression report
happens I can fix things up with a one-liner plus FIXME comment that
someone should fix up the suspend/resume code in that driver.

But at least all new drivers won't be broken by accident as soon as
you turn off fbcon because "suspend/resume worked when I tested it".

v2: Keep this for radeon because of

commit 18c437caa5b18a235dd65cec224eab54bebcee65
Author: Alex Deucher <alexander.deucher at amd.com>
Date:   Tue Nov 14 17:19:29 2017 -0500

    Revert "drm/radeon: dont switch vt on suspend"

Thanks to Michel Dänzer for pointing this one out.

Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
Cc: Michel Dänzer <michel at daenzer.net>
Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Cc: Maxime Ripard <maxime.ripard at bootlin.com>
Cc: Sean Paul <sean at poorly.run>
Cc: David Airlie <airlied at linux.ie>
Cc: Jani Nikula <jani.nikula at linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Cc: Ben Skeggs <bskeggs at redhat.com>
Cc: Sandy Huang <hjc at rock-chips.com>
Cc: "Heiko Stübner" <heiko at sntech.de>
Cc: Alex Deucher <alexander.deucher at amd.com>
Cc: "Christian König" <christian.koenig at amd.com>
Cc: Samuel Li <Samuel.Li at amd.com>
Cc: "Michel Dänzer" <michel.daenzer at amd.com>
Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
Cc: Junwei Zhang <Jerry.Zhang at amd.com>
Cc: Huang Rui <ray.huang at amd.com>
Cc: Shirish S <shirish.s at amd.com>
Cc: Daniel Stone <daniels at collabora.com>
Cc: "Noralf Trønnes" <noralf at tronnes.org>
Cc: intel-gfx at lists.freedesktop.org
Cc: nouveau at lists.freedesktop.org
Cc: linux-arm-kernel at lists.infradead.org
Cc: linux-rockchip at lists.infradead.org
 drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c        | 1 -
 drivers/gpu/drm/drm_fb_helper.c               | 1 +
 drivers/gpu/drm/i915/intel_fbdev.c            | 3 ---
 drivers/gpu/drm/nouveau/nouveau_fbcon.c       | 1 -
 drivers/gpu/drm/radeon/radeon_fb.c            | 3 +++
 drivers/gpu/drm/rockchip/rockchip_drm_fbdev.c | 2 --
 6 files changed, 4 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
index 5cbde74b97dd..24890d8f9ee4 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
@@ -234,7 +234,6 @@ static int amdgpufb_create(struct drm_fb_helper *helper,
 	info->par = rfbdev;
-	info->skip_vt_switch = true;
 	ret = amdgpu_display_framebuffer_init(adev->ddev, &rfbdev->rfb,
 					      &mode_cmd, gobj);
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 5e9ca6f96379..41f37704e0a3 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -934,6 +934,7 @@ struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper)
 	fb_helper->fbdev = info;
+	info->skip_vt_switch = true;
 	return info;
diff --git a/drivers/gpu/drm/i915/intel_fbdev.c b/drivers/gpu/drm/i915/intel_fbdev.c
index 2480c7d6edee..d6f8d4bbc9fc 100644
--- a/drivers/gpu/drm/i915/intel_fbdev.c
+++ b/drivers/gpu/drm/i915/intel_fbdev.c
@@ -257,9 +257,6 @@ static int intelfb_create(struct drm_fb_helper *helper,
 	info->screen_base = vaddr;
 	info->screen_size = vma->node.size;
-	/* This driver doesn't need a VT switch to restore the mode on resume */
-	info->skip_vt_switch = true;
 	drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth);
 	drm_fb_helper_fill_var(info, &ifbdev->helper, sizes->fb_width, sizes->fb_height);
diff --git a/drivers/gpu/drm/nouveau/nouveau_fbcon.c b/drivers/gpu/drm/nouveau/nouveau_fbcon.c
index 032317c81bf0..67572408d9ae 100644
--- a/drivers/gpu/drm/nouveau/nouveau_fbcon.c
+++ b/drivers/gpu/drm/nouveau/nouveau_fbcon.c
@@ -365,7 +365,6 @@ nouveau_fbcon_create(struct drm_fb_helper *helper,
 		ret = PTR_ERR(info);
 		goto out_unlock;
-	info->skip_vt_switch = 1;
 	info->par = fbcon;
diff --git a/drivers/gpu/drm/radeon/radeon_fb.c b/drivers/gpu/drm/radeon/radeon_fb.c
index 1179034024ae..d50bff20f7de 100644
--- a/drivers/gpu/drm/radeon/radeon_fb.c
+++ b/drivers/gpu/drm/radeon/radeon_fb.c
@@ -244,6 +244,9 @@ static int radeonfb_create(struct drm_fb_helper *helper,
 		goto out;
+	/* radeon resume is fragile and needs a vt switch to help it along */
+	info->skip_vt_switch = false;
 	info->par = rfbdev;
 	ret = radeon_framebuffer_init(rdev->ddev, &rfbdev->fb, &mode_cmd, gobj);
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_fbdev.c b/drivers/gpu/drm/rockchip/rockchip_drm_fbdev.c
index e6650553f5d6..361604e51361 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_fbdev.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_fbdev.c
@@ -111,8 +111,6 @@ static int rockchip_drm_fbdev_create(struct drm_fb_helper *helper,
 		      offset, size);
-	fbi->skip_vt_switch = true;
 	return 0;

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