[Intel-gfx] [PATCH] drm/i915: Clear crtc atomic flags at beginning of transaction

[Matt Roper]

Once we have full atomic modeset, these kind of flags should be in a
real intel_crtc_state that's tracked properly.  In the meantime, make
sure we clear out any old flags at the beginning of a transaction so
that we don't wind up seeing leftover flags from old transactions that
were checked, but never went to the commit step.

Cc: Rodrigo Vivi <rodrigo.vivi at gmail.com>
Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
---
Rodrigo, does this solve the frontbuffer problems you're seeing?  I haven't had
time to test this myself, but I think this will fix at least one problem that
may or may not have been the source of your troubles.

 drivers/gpu/drm/i915/intel_atomic.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_atomic.c b/drivers/gpu/drm/i915/intel_atomic.c
index 011b896..fe51e23 100644
--- a/drivers/gpu/drm/i915/intel_atomic.c
+++ b/drivers/gpu/drm/i915/intel_atomic.c
@@ -76,6 +76,8 @@ int intel_atomic_check(struct drm_device *dev,
 	state->allow_modeset = false;
 	for (i = 0; i < ncrtcs; i++) {
 		struct intel_crtc *crtc = to_intel_crtc(state->crtcs[i]);
+		if (crtc)
+			memset(&crtc->atomic, 0, sizeof(crtc->atomic));
 		if (crtc && crtc->pipe != nuclear_pipe)
 			not_nuclear = true;
 	}
-- 
1.8.5.1