drm: Nuke ->vblank_disable_allowed

This was added in

commit 0a3e67a4caac273a3bfc4ced3da364830b1ab241
Author: Jesse Barnes <jbarnes@virtuousgeek.org>
Date:   Tue Sep 30 12:14:26 2008 -0700

    drm: Rework vblank-wait handling to allow interrupt reduction.

to stay backwards-compatible with old UMS code that didn't even tell
the kernel when it did a modeset, so that the kernel could
save/restore vblank counters. At worst this means vblanks will be
somewhat funky on a setup that very likely no one still runs.

So let's just nuke it.

Plan B would be to set it unconditionally in drm_vblank_init for kms
drivers, instead of in each driver separately. So if this patch breaks
anything please only restore the hunks in drmP.h and drm_irq.c, plus
add a check for DRIVER_MODESET in drm_vblank_init.

Stumbled over this in a discussion on irc with Chris.

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Liviu Dudau <liviu.dudau@arm.com>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Eric Anholt <eric@anholt.net>
Cc: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Cc: Inki Dae <inki.dae@samsung.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: Mark Yao <mark.yao@rock-chips.com>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Liviu Dudau <Liviu.Dudau@arm.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 0 insertions, 6 deletions

diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 3c1a6f18e71c..0fac801c18fe 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -348,9 +348,6 @@ static void vblank_disable_fn(unsigned long arg)
         unsigned int pipe = vblank->pipe;
         unsigned long irqflags;
 
-        if (!dev->vblank_disable_allowed)
-                return;
-
         spin_lock_irqsave(&dev->vbl_lock, irqflags);
         if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) {
                 DRM_DEBUG("disabling vblank on crtc %u\n", pipe);
@@ -437,8 +434,6 @@ int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs)
                          "get_vblank_timestamp == NULL\n");
         }
 
-        dev->vblank_disable_allowed = false;
-
         return 0;
 
 err:
@@ -1585,7 +1580,6 @@ void drm_vblank_post_modeset(struct drm_device *dev, unsigned int pipe)
 
         if (vblank->inmodeset) {
                 spin_lock_irqsave(&dev->vbl_lock, irqflags);
-                dev->vblank_disable_allowed = true;
                 drm_reset_vblank_timestamp(dev, pipe);
                 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);