drm/i915/overlay: Workaround i830 overlay activation bug.
On i830, there exists a bug where an overlay on pipe B requires the mode
clock on pipe A in order to activate. So workaround this by activating
pipe A when trying to enable the overlay on pipe B.
References:
[Bug 29007] GPU hang on video playback with overlay
https://bugs.freedesktop.org/show_bug.cgi?id=29007
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/drivers/gpu/drm/i915/intel_overlay.c b/drivers/gpu/drm/i915/intel_overlay.c
index 5ca7ef0..389690d 100644
--- a/drivers/gpu/drm/i915/intel_overlay.c
+++ b/drivers/gpu/drm/i915/intel_overlay.c
@@ -243,18 +243,76 @@
return 0;
}
+/* Workaround for i830 bug where pipe a must be enable to change control regs */
+static int
+i830_activate_pipe_a(struct drm_device *dev)
+{
+ drm_i915_private_t *dev_priv = dev->dev_private;
+ struct intel_crtc *crtc;
+ struct drm_crtc_helper_funcs *crtc_funcs;
+ struct drm_display_mode vesa_640x480 = {
+ DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 25175, 640, 656,
+ 752, 800, 0, 480, 489, 492, 525, 0,
+ DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC)
+ }, *mode;
+
+ crtc = to_intel_crtc(dev_priv->pipe_to_crtc_mapping[0]);
+ if (crtc->dpms_mode == DRM_MODE_DPMS_ON)
+ return 0;
+
+ /* most i8xx have pipe a forced on, so don't trust dpms mode */
+ if (I915_READ(PIPEACONF) & PIPEACONF_ENABLE)
+ return 0;
+
+ crtc_funcs = crtc->base.helper_private;
+ if (crtc_funcs->dpms == NULL)
+ return 0;
+
+ DRM_DEBUG_DRIVER("Enabling pipe A in order to enable overlay\n");
+
+ mode = drm_mode_duplicate(dev, &vesa_640x480);
+ drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
+ if(!drm_crtc_helper_set_mode(&crtc->base, mode,
+ crtc->base.x, crtc->base.y,
+ crtc->base.fb))
+ return 0;
+
+ crtc_funcs->dpms(&crtc->base, DRM_MODE_DPMS_ON);
+ return 1;
+}
+
+static void
+i830_deactivate_pipe_a(struct drm_device *dev)
+{
+ drm_i915_private_t *dev_priv = dev->dev_private;
+ struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[0];
+ struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
+
+ crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
+}
+
/* overlay needs to be disable in OCMD reg */
static int intel_overlay_on(struct intel_overlay *overlay)
{
struct drm_device *dev = overlay->dev;
struct drm_i915_gem_request *request;
+ int pipe_a_quirk = 0;
+ int ret;
BUG_ON(overlay->active);
overlay->active = 1;
+ if (IS_I830(dev)) {
+ pipe_a_quirk = i830_activate_pipe_a(dev);
+ if (pipe_a_quirk < 0)
+ return pipe_a_quirk;
+ }
+
request = kzalloc(sizeof(*request), GFP_KERNEL);
- if (request == NULL)
- return -ENOMEM;
+ if (request == NULL) {
+ ret = -ENOMEM;
+ goto out;
+ }
BEGIN_LP_RING(4);
OUT_RING(MI_OVERLAY_FLIP | MI_OVERLAY_ON);
@@ -263,8 +321,13 @@
OUT_RING(MI_NOOP);
ADVANCE_LP_RING();
- return intel_overlay_do_wait_request(overlay, request, true,
- NEEDS_WAIT_FOR_FLIP);
+ ret = intel_overlay_do_wait_request(overlay, request, true,
+ NEEDS_WAIT_FOR_FLIP);
+out:
+ if (pipe_a_quirk)
+ i830_deactivate_pipe_a(dev);
+
+ return ret;
}
/* overlay needs to be enabled in OCMD reg */