drm/i915: Clean conflicting modesetting registers upon init

If we leave the registers in a conflicting state then when we attempt
to teardown the active mode, we will not disable the pipes and planes
in the correct order -- leaving a plane reading from a disabled pipe and
possibly leading to undefined behaviour.

Reported-and-tested-by: Andy Whitcroft <apw@canonical.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=32078
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: stable@kernel.org

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 9d3af3c..e5badad 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5238,6 +5238,55 @@ static const struct drm_crtc_funcs intel_crtc_funcs = {
        .page_flip = intel_crtc_page_flip,
 };
 
+static void intel_sanitize_modesetting(struct drm_device *dev,
+                                      int pipe, int plane)
+{
+       struct drm_i915_private *dev_priv = dev->dev_private;
+       u32 reg, val;
+
+       if (HAS_PCH_SPLIT(dev))
+               return;
+
+       /* Who knows what state these registers were left in by the BIOS or
+        * grub?
+        *
+        * If we leave the registers in a conflicting state (e.g. with the
+        * display plane reading from the other pipe than the one we intend
+        * to use) then when we attempt to teardown the active mode, we will
+        * not disable the pipes and planes in the correct order -- leaving
+        * a plane reading from a disabled pipe and possibly leading to
+        * undefined behaviour.
+        */
+
+       reg = DSPCNTR(plane);
+       val = I915_READ(reg);
+
+       if ((val & DISPLAY_PLANE_ENABLE) == 0)
+               return;
+       if (!!(val & DISPPLANE_SEL_PIPE_MASK) == pipe)
+               return;
+
+       /* This display plane is active and attached to the other CPU pipe. */
+       pipe = !pipe;
+
+       /* Disable the plane and wait for it to stop reading from the pipe. */
+       I915_WRITE(reg, val & ~DISPLAY_PLANE_ENABLE);
+       intel_flush_display_plane(dev, plane);
+
+       if (IS_GEN2(dev))
+               intel_wait_for_vblank(dev, pipe);
+
+       if (pipe == 0 && (dev_priv->quirks & QUIRK_PIPEA_FORCE))
+               return;
+
+       /* Switch off the pipe. */
+       reg = PIPECONF(pipe);
+       val = I915_READ(reg);
+       if (val & PIPECONF_ENABLE) {
+               I915_WRITE(reg, val & ~PIPECONF_ENABLE);
+               intel_wait_for_pipe_off(dev, pipe);
+       }
+}
 
 static void intel_crtc_init(struct drm_device *dev, int pipe)
 {
@@ -5289,6 +5338,8 @@ static void intel_crtc_init(struct drm_device *dev, int pipe)
 
        setup_timer(&intel_crtc->idle_timer, intel_crtc_idle_timer,
                    (unsigned long)intel_crtc);
+
+       intel_sanitize_modesetting(dev, intel_crtc->pipe, intel_crtc->plane);
 }
 
 int intel_get_pipe_from_crtc_id(struct drm_device *dev, void *data,