[Intel-gfx] [PATCH 7/9] drm/i915: Update watermarks after the derived plane state is uptodate

[ville.syrjala at linux.intel.com]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

When enabling planes during .crtc_enable() we currently want to update
the watermarks before enabling the planes. We already do it once just
before enabling the pipe, but at that point out derived plane state is
still out of whack, so we need to do it again after the .atomic_check()
hooks have been called.

What this means is now we could actually start to trust the derived
plane state (clipped size, 'visible', etc.) in the watermark code.

The pre pipe enable watermark update is supposed to be just make sure
the other pipes are ready to have their FIFOs potentially reduced, so we
need to keep it there as well.

Since we don't yet have proper two-part watermark update leave the
watermakrs alone in the plane disable case. This way they'll get updated
only after the planes and pipe have all been turned off.

Cc: Matt Roper <matthew.d.roper at intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 33680a8..a9201a7 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4167,6 +4167,8 @@ static void _intel_crtc_enable_planes(struct intel_crtc *crtc)
 			state->visible = false;
 	}
 
+	intel_update_watermarks(&crtc->base);
+
 	crtc_funcs->atomic_begin(&crtc->base);
 
 	for_each_intel_plane(dev, plane) {
@@ -4213,6 +4215,8 @@ static void _intel_crtc_disable_planes(struct intel_crtc *crtc)
 	}
 
 	crtc_funcs->atomic_flush(&crtc->base);
+
+	/* we'll defer watermark update to after the pipe has been disabled */
 }
 
 void hsw_enable_ips(struct intel_crtc *crtc)
-- 
2.0.5