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drm/i915: Disable all crtcs during driver unload, v2.

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We may keep the crtc's enabled when userspace unsets all framebuffers but
keeps the crtc active. This exposes a WARN in fbc_global disable, and
a lot of bugs in our hardware readout code. Solve this by disabling
all crtc's for now.

Changes since v1:
- Use lock_all_ctx instead of lock_all.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1481812185-19098-4-git-send-email-maarten.lankhorst@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Maarten Lankhorst 2016-12-15 15:29:44 +01:00
parent 453cfe2171
commit a667fb402c
1 changed files with 21 additions and 0 deletions
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21
drivers/gpu/drm/i915/i915_drv.c
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@ -43,6 +43,7 @@
#include <drm/drmP.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_atomic_helper.h>
#include <drm/i915_drm.h>
#include "i915_drv.h"
@ -1307,6 +1308,8 @@ void i915_driver_unload(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = to_i915(dev);
struct pci_dev *pdev = dev_priv->drm.pdev;
struct drm_modeset_acquire_ctx ctx;
int ret;
intel_fbdev_fini(dev);
@ -1315,6 +1318,24 @@ void i915_driver_unload(struct drm_device *dev)
intel_display_power_get(dev_priv, POWER_DOMAIN_INIT);
drm_modeset_acquire_init(&ctx, 0);
while (1) {
ret = drm_modeset_lock_all_ctx(dev, &ctx);
if (!ret)
ret = drm_atomic_helper_disable_all(dev, &ctx);
if (ret != -EDEADLK)
break;
drm_modeset_backoff(&ctx);
}
if (ret)
DRM_ERROR("Disabling all crtc's during unload failed with %i\n", ret);
drm_modeset_drop_locks(&ctx);
drm_modeset_acquire_fini(&ctx);
i915_driver_unregister(dev_priv);
drm_vblank_cleanup(dev);