From 23a15ee604bde60fe0c970565b5c82d7998fc98b Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Thu, 20 Feb 2014 09:22:14 +0000 Subject: [PATCH] drm/i915: Perform pageflip using mmio if the GPU is terminally wedged After a hang and failed reset, we cannot use the GPU to execute the page flip instructions. Instead we can force a synchronous mmio flip. (Later, we can reduce the synchronicity of the mmio flip by moving some of the delays off to a worker, like the current page flip code; see vblank tasks.) References: https://bugs.freedesktop.org/show_bug.cgi?id=72631 Signed-off-by: Chris Wilson --- drivers/gpu/drm/i915/intel_display.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 79ef515..d5eafd1 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -8717,6 +8717,9 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc, fb->pitches[0] != crtc->fb->pitches[0])) return -EINVAL; + if (i915_terminally_wedged(&dev_priv->gpu_error)) + goto out_hang; + work = kzalloc(sizeof(*work), GFP_KERNEL); if (work == NULL) return -ENOMEM; @@ -8791,6 +8794,13 @@ cleanup: free_work: kfree(work); + if (ret == -EIO) { +out_hang: + intel_crtc_wait_for_pending_flips(crtc); + ret = intel_pipe_set_base(crtc, crtc->x, crtc->y, fb); + if (ret == 0 && event) + drm_send_vblank_event(dev, intel_crtc->pipe, event); + } return ret; } -- 1.7.9.5