Add the details of the implementation of asynchronous flips for i915.
v7: -Rebased.
v8: -Rebased.
v9: -Rebased.
v10: Move all documentation changes to this patch. (Ville)
Signed-off-by: Karthik B S <karthik.b.s@xxxxxxxxx>
Signed-off-by: Vandita Kulkarni <vandita.kulkarni@xxxxxxxxx>
Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
Documentation/gpu/i915.rst | 6 ++++++
drivers/gpu/drm/i915/display/intel_display.c | 18 ++++++++++++++++++
2 files changed, 24 insertions(+)
diff --git a/Documentation/gpu/i915.rst b/Documentation/gpu/i915.rst
index 33cc6ddf8f64..84ead508f7ad 100644
--- a/Documentation/gpu/i915.rst
+++ b/Documentation/gpu/i915.rst
@@ -118,6 +118,12 @@ Atomic Plane Helpers
.. kernel-doc:: drivers/gpu/drm/i915/display/intel_atomic_plane.c
:internal:
+Asynchronous Page Flip
+----------------------
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_display.c
+ :doc: asynchronous flip implementation
+
Output Probing
--------------
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index dda32ab389b7..c0e0c8992982 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -14923,6 +14923,24 @@ static bool intel_cpu_transcoders_need_modeset(struct intel_atomic_state *state,
return false;
}
+/**
+ * DOC: asynchronous flip implementation
+ *
+ * Asynchronous page flip is the implementation for the DRM_MODE_PAGE_FLIP_ASYNC
+ * flag. Currently async flip is only supported via the drmModePageFlip IOCTL.
+ * Correspondingly, support is currently added for primary plane only.
+ *
+ * Async flip can only change the plane surface address, so anything else
+ * changing is rejected from the intel_atomic_check_async() function.
+ * Once this check is cleared, flip done interrupt is enabled using
+ * the skl_enable_flip_done() function.
+ *
+ * As soon as the surface address register is written, flip done interrupt is
+ * generated and the requested events are sent to the usersapce in the interrupt
+ * handler itself. The timestamp and sequence sent during the flip done event
+ * correspond to the last vblank and have no relation to the actual time when
+ * the flip done event was sent.
+ */
static int intel_atomic_check_async(struct intel_atomic_state *state)
{
struct drm_i915_private *i915 = to_i915(state->base.dev);
--
2.22.0
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