[Intel-gfx] [RFC 4/7] drm/i915/dsi: Helper to find dsi encoder in cmd mode

[Vandita Kulkarni]

From: Madhav Chauhan <madhav.chauhan at intel.com>

This patch adds a helper function to find encoder
if DSI is operating in command mode. This function
will be used while enabling/disabling TE interrupts
for DSI.

Signed-off-by: Madhav Chauhan <madhav.chauhan at intel.com>
Signed-off-by: Vandita Kulkarni <vandita.kulkarni at intel.com>
---
 drivers/gpu/drm/i915/display/icl_dsi.c   | 17 +++++++++++++++++
 drivers/gpu/drm/i915/display/intel_dsi.h |  3 +++
 2 files changed, 20 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/icl_dsi.c b/drivers/gpu/drm/i915/display/icl_dsi.c
index 5dd9eebab6b1..877746416e52 100644
--- a/drivers/gpu/drm/i915/display/icl_dsi.c
+++ b/drivers/gpu/drm/i915/display/icl_dsi.c
@@ -73,6 +73,23 @@ static enum transcoder dsi_port_to_transcoder(enum port port)
 		return TRANSCODER_DSI_1;
 }
 
+struct intel_encoder *gen11_dsi_find_cmd_mode_encoder(struct intel_crtc *crtc)
+{
+	struct drm_device *dev = crtc->base.dev;
+	struct intel_encoder *encoder;
+	struct intel_dsi *intel_dsi;
+
+	for_each_encoder_on_crtc(dev, &crtc->base, encoder) {
+		if (encoder->type != INTEL_OUTPUT_DSI)
+			continue;
+		intel_dsi = enc_to_intel_dsi(&encoder->base);
+		if (intel_dsi->operation_mode == INTEL_DSI_COMMAND_MODE)
+			return encoder;
+	}
+
+	return NULL;
+}
+
 static void wait_for_cmds_dispatched_to_panel(struct intel_encoder *encoder)
 {
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
diff --git a/drivers/gpu/drm/i915/display/intel_dsi.h b/drivers/gpu/drm/i915/display/intel_dsi.h
index b15be5814599..071dad7ee04a 100644
--- a/drivers/gpu/drm/i915/display/intel_dsi.h
+++ b/drivers/gpu/drm/i915/display/intel_dsi.h
@@ -201,6 +201,9 @@ u32 bxt_dsi_get_pclk(struct intel_encoder *encoder,
 		     struct intel_crtc_state *config);
 void bxt_dsi_reset_clocks(struct intel_encoder *encoder, enum port port);
 
+/* icl_dsi.c */
+struct intel_encoder *gen11_dsi_find_cmd_mode_encoder(struct intel_crtc *crtc);
+
 /* intel_dsi_vbt.c */
 bool intel_dsi_vbt_init(struct intel_dsi *intel_dsi, u16 panel_id);
 void intel_dsi_vbt_exec_sequence(struct intel_dsi *intel_dsi,
-- 
2.21.0.5.gaeb582a