[PATCH 26/28] drm/i915/writeback: Define the disable sequence for writeback

[Suraj Kandpal]

Define the disable sequence for a writeback encoder. We only disable
the encoder if no writeback job is pending, if it is then we just
need to disable the wd function so that values can be updated
accordingly.

Signed-off-by: Suraj Kandpal <suraj.kandpal at intel.com>
---
 .../gpu/drm/i915/display/intel_writeback.c    | 28 +++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_writeback.c b/drivers/gpu/drm/i915/display/intel_writeback.c
index d66843fecd9a..f8e940d91cb7 100644
--- a/drivers/gpu/drm/i915/display/intel_writeback.c
+++ b/drivers/gpu/drm/i915/display/intel_writeback.c
@@ -596,6 +596,33 @@ void intel_writeback_isr_handler(struct intel_display *display)
 	}
 }
 
+static void
+intel_writeback_disable_encoder(struct intel_atomic_state *state,
+				struct intel_encoder *encoder,
+				const struct intel_crtc_state *crtc_state,
+				const struct drm_connector_state *conn_state)
+{
+	struct intel_display *display = to_intel_display(encoder);
+	struct intel_writeback_connector *wb_conn =
+		enc_to_intel_writeback_connector(encoder);
+	struct intel_crtc *pipe_crtc;
+	int i = 0;
+
+	for_each_pipe_crtc_modeset_disable(display, pipe_crtc, crtc_state, i) {
+		const struct intel_crtc_state *old_pipe_crtc_state =
+			intel_atomic_get_old_crtc_state(state, pipe_crtc);
+
+		intel_crtc_vblank_off(old_pipe_crtc_state);
+	}
+
+	intel_de_rmw(display, TRANSCONF_WD(crtc_state->cpu_transcoder), WD_TRANS_ENABLE,
+		     REG_FIELD_PREP(WD_TRANS_ENABLE, 0));
+	intel_de_rmw(display, WD_TRANS_FUNC_CTL(crtc_state->cpu_transcoder),
+		     TRANS_WD_FUNC_ENABLE,
+		     REG_FIELD_PREP(TRANS_WD_FUNC_ENABLE, 0));
+	wb_conn->frame_num = 1;
+}
+
 int intel_writeback_init(struct intel_display *display)
 {
 	struct intel_encoder *encoder;
@@ -624,6 +651,7 @@ int intel_writeback_init(struct intel_display *display)
 	encoder->get_hw_state = intel_writeback_get_hw_state;
 	encoder->compute_config = intel_writeback_compute_config;
 	encoder->enable = intel_writeback_enable_encoder;
+	encoder->disable = intel_writeback_disable_encoder;
 
 	connector = &writeback_conn->connector;
 	intel_writeback_connector_alloc(connector);
-- 
2.34.1