[src/trunk]: src/sys/external/bsd/drm2/dist/drm/i915 Fix pipe update waits.

[riastradh <riastradh%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/f443005a30e9
branches:  trunk
changeset: 365979:f443005a30e9
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Mon Aug 27 07:28:15 2018 +0000

description:
Fix pipe update waits.

diffstat:

 sys/external/bsd/drm2/dist/drm/i915/intel_sprite.c |  20 +++++++++++++++++---
 1 files changed, 17 insertions(+), 3 deletions(-)

diffs (64 lines):

diff -r 0d2d723c25f2 -r f443005a30e9 sys/external/bsd/drm2/dist/drm/i915/intel_sprite.c
--- a/sys/external/bsd/drm2/dist/drm/i915/intel_sprite.c        Mon Aug 27 07:28:04 2018 +0000
+++ b/sys/external/bsd/drm2/dist/drm/i915/intel_sprite.c        Mon Aug 27 07:28:15 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: intel_sprite.c,v 1.5 2018/08/27 07:28:04 riastradh Exp $       */
+/*     $NetBSD: intel_sprite.c,v 1.6 2018/08/27 07:28:15 riastradh Exp $       */
 
 /*
  * Copyright © 2011 Intel Corporation
@@ -32,7 +32,7 @@
  * support.
  */
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: intel_sprite.c,v 1.5 2018/08/27 07:28:04 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: intel_sprite.c,v 1.6 2018/08/27 07:28:15 riastradh Exp $");
 
 #include <drm/drmP.h>
 #include <drm/drm_crtc.h>
@@ -92,6 +92,7 @@
        int scanline, min, max, vblank_start;
 #ifdef __NetBSD__
        drm_waitqueue_t *wq = drm_crtc_vblank_waitqueue(&crtc->base);
+       int ret;
 #else
        wait_queue_head_t *wq = drm_crtc_vblank_waitqueue(&crtc->base);
        DEFINE_WAIT(wait);
@@ -105,7 +106,11 @@
        min = vblank_start - usecs_to_scanlines(adjusted_mode, 100);
        max = vblank_start - 1;
 
+#ifdef __NetBSD__
+       spin_lock(&dev->vbl_lock);
+#else
        local_irq_disable();
+#endif
 
        if (min <= 0 || max <= 0)
                return;
@@ -118,7 +123,12 @@
        trace_i915_pipe_update_start(crtc);
 
 #ifdef __NetBSD__
-       panic("XXX");
+       DRM_SPIN_TIMED_WAIT_UNTIL(ret, wq, &dev->vbl_lock, timeout,
+           (scanline = intel_get_crtc_scanline(crtc),
+               scanline < min || scanline > max));
+       if (ret)
+               DRM_ERROR("Potential atomic update failure on pipe %c\n",
+                   pipe_name(crtc->pipe));
 #else
        for (;;) {
                /*
@@ -177,7 +187,11 @@
 
        trace_i915_pipe_update_end(crtc, end_vbl_count, scanline_end);
 
+#ifdef __NetBSD__
+       spin_unlock(&dev->vbl_lock);
+#else
        local_irq_enable();
+#endif
 
        if (crtc->debug.start_vbl_count &&
            crtc->debug.start_vbl_count != end_vbl_count) {