[Intel-gfx] [PATCH 03/43] drm/i915: rip out crtc prepare/commit indirection

[Daniel Vetter]

Just impendance matching with the the crtc helper stuff.

... and somehow the design of this all ended up in this commit here,
too ;-)

The big plan is that a new set of display_funcs that take crtc take
full responsibility of a modeset (and call down into object-specific
callbacks and functions). The platform-specific callbacks simply know
best what the proper order is.

This has the drawback that we can't do minimal change-overs any more
if a modeset just disables one encoder in a cloned configuration
(because we will only expose a disabl/enable action that takes
down/sets up the entire crtc including all encoders). Imo that's the
only sane way to do it though:
- The use-case for this is pretty minimal, even when presenting (at
  least sane people) should use a dual-screen output so that you can
  see your notes on your panel. Clone mode is imo BS.
- With all the clone mode constrains, shared resources, and special
  ordering requirements (which differ even on the same platform
  sometimes for different outputs) there's no way we'd get this right
  for all cases. Especially since this is a under-used feature.
- And to top it off: On haswell even dp link re-training requires us
  to take down the entire display pipe - otherwise the chip dies.

So the only sane way is to do a full modeset on every crtc where the
output config changes in any way.

To support atomic modeset we'd then add one more function to allocate
global and shared objects in the best ways (e.g. fdi links, pch plls,
...). The crtc functions would then simply use the pre-allocated stuff
(and shouldn't be able to fail, ever). We could even do all the object
pinning in there (and maybe try to defragment the global gtt if we
fail)!

Signed-Off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
 drivers/gpu/drm/i915/intel_display.c |   37 +--------------------------------
 1 files changed, 2 insertions(+), 35 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 072f94d..608046f 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3457,34 +3457,6 @@ static void intel_crtc_disable(struct drm_crtc *crtc)
 	}
 }
 
-/* Prepare for a mode set.
- *
- * Note we could be a lot smarter here.  We need to figure out which outputs
- * will be enabled, which disabled (in short, how the config will changes)
- * and perform the minimum necessary steps to accomplish that, e.g. updating
- * watermarks, FBC configuration, making sure PLLs are programmed correctly,
- * panel fitting is in the proper state, etc.
- */
-static void i9xx_crtc_prepare(struct drm_crtc *crtc)
-{
-	i9xx_crtc_disable(crtc);
-}
-
-static void i9xx_crtc_commit(struct drm_crtc *crtc)
-{
-	i9xx_crtc_enable(crtc);
-}
-
-static void ironlake_crtc_prepare(struct drm_crtc *crtc)
-{
-	ironlake_crtc_disable(crtc);
-}
-
-static void ironlake_crtc_commit(struct drm_crtc *crtc)
-{
-	ironlake_crtc_enable(crtc);
-}
-
 void intel_encoder_prepare(struct drm_encoder *encoder)
 {
 	struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
@@ -6598,13 +6570,8 @@ static void intel_crtc_init(struct drm_device *dev, int pipe)
 	intel_crtc->active = true; /* force the pipe off on setup_init_config */
 	intel_crtc->bpp = 24; /* default for pre-Ironlake */
 
-	if (HAS_PCH_SPLIT(dev)) {
-		intel_helper_funcs.prepare = ironlake_crtc_prepare;
-		intel_helper_funcs.commit = ironlake_crtc_commit;
-	} else {
-		intel_helper_funcs.prepare = i9xx_crtc_prepare;
-		intel_helper_funcs.commit = i9xx_crtc_commit;
-	}
+	intel_helper_funcs.prepare = dev_priv->display.crtc_disable;
+	intel_helper_funcs.commit = dev_priv->display.crtc_enable;
 
 	drm_crtc_helper_add(&intel_crtc->base, &intel_helper_funcs);
 
-- 
1.7.7.6