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drm/atomic-helper: Add an atomice best_encoder callback

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With legacy helpers all the routing was already set up when calling
best_encoder and so could be inspected. But with atomic it's staged,
hence we need a new atomic compliant callback for drivers which need
to inspect the requested state and can't just decided the best encoder
statically.

This is needed to fix up i915 dp mst where we need to pick the right
encoder depending upon the requested CRTC for the connector.

v2: Don't forget to amend the kerneldoc

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Theodore Ts'o <tytso@mit.edu>
Acked-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Ander Conselvan de Oliveira <conselvan2@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
This commit is contained in:
Daniel Vetter
2015-08-03 17:24:08 +02:00
parent 74d33293e4
commit 3b8a684bd6
2 changed files with 9 additions and 1 deletions
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7
drivers/gpu/drm/drm_atomic_helper.c
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@@ -196,7 +196,12 @@ update_connector_routing(struct drm_atomic_state *state, int conn_idx)
}
funcs = connector->helper_private;
new_encoder = funcs->best_encoder(connector);
if (funcs->atomic_best_encoder)
new_encoder = funcs->atomic_best_encoder(connector,
connector_state);
else
new_encoder = funcs->best_encoder(connector);
if (!new_encoder) {
DRM_DEBUG_ATOMIC("No suitable encoder found for [CONNECTOR:%d:%s]\n",