[PATCH] drm/vkms: Solve bug on kms_crc_cursor tests

[Shayenne Moura]

vkms_crc_work_handle needs the value of the actual frame to
schedule the workqueue that calls periodically the vblank
handler and the destroy state functions. However, the frame
value returned from vkms_vblank_simulate is updated and
diminished in vblank_get_timestamp because it is not in a
vblank interrupt, and return an inaccurate value.

Solve this getting the actual vblank frame directly from the
vblank->count inside the `struct drm_crtc`, instead of using
the `drm_accurate_vblank_count` function.

Signed-off-by: Shayenne Moura <shayenneluzmo...@gmail.com>
---
 drivers/gpu/drm/vkms/vkms_crc.c  | 4 +++-
 drivers/gpu/drm/vkms/vkms_crtc.c | 4 +++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/vkms/vkms_crc.c b/drivers/gpu/drm/vkms/vkms_crc.c
index d7b409a3c0f8..09a8b00ef1f1 100644
--- a/drivers/gpu/drm/vkms/vkms_crc.c
+++ b/drivers/gpu/drm/vkms/vkms_crc.c
@@ -161,6 +161,8 @@ void vkms_crc_work_handle(struct work_struct *work)
        struct vkms_output *out = drm_crtc_to_vkms_output(crtc);
        struct vkms_device *vdev = container_of(out, struct vkms_device,
                                                output);
+       unsigned int pipe = drm_crtc_index(crtc);
+       struct drm_vblank_crtc *vblank = &crtc->dev->vblank[pipe];
        struct vkms_crc_data *primary_crc = NULL;
        struct vkms_crc_data *cursor_crc = NULL;
        struct drm_plane *plane;
@@ -196,7 +198,7 @@ void vkms_crc_work_handle(struct work_struct *work)
        if (primary_crc)
                crc32 = _vkms_get_crc(primary_crc, cursor_crc);
 
-       frame_end = drm_crtc_accurate_vblank_count(crtc);
+       frame_end = vblank->count;
 
        /* queue_work can fail to schedule crc_work; add crc for
         * missing frames
diff --git a/drivers/gpu/drm/vkms/vkms_crtc.c b/drivers/gpu/drm/vkms/vkms_crtc.c
index 8a9aeb0a9ea8..9bf3268e2e92 100644
--- a/drivers/gpu/drm/vkms/vkms_crtc.c
+++ b/drivers/gpu/drm/vkms/vkms_crtc.c
@@ -10,6 +10,8 @@ static enum hrtimer_restart vkms_vblank_simulate(struct 
hrtimer *timer)
                                                  vblank_hrtimer);
        struct drm_crtc *crtc = &output->crtc;
        struct vkms_crtc_state *state = to_vkms_crtc_state(crtc->state);
+       unsigned int pipe = drm_crtc_index(crtc);
+       struct drm_vblank_crtc *vblank = &crtc->dev->vblank[pipe];
        u64 ret_overrun;
        bool ret;
 
@@ -20,7 +22,7 @@ static enum hrtimer_restart vkms_vblank_simulate(struct 
hrtimer *timer)
                DRM_ERROR("vkms failure on handling vblank");
 
        if (state && output->crc_enabled) {
-               u64 frame = drm_crtc_accurate_vblank_count(crtc);
+               u64 frame = vblank->count;
 
                /* update frame_start only if a queued vkms_crc_work_handle()
                 * has read the data
-- 
2.17.1