[Intel-gfx] [RFC-v2 2/9] drm/i915/dsi: Configure transcoder operation for command mode.

[Vandita Kulkarni]

Configure the transcoder to operate in TE GATE command mode
and  take TE events from GPIO.
Also disable the periodic command mode, that GOP would have
programmed.

Signed-off-by: Vandita Kulkarni <vandita.kulkarni at intel.com>
---
 drivers/gpu/drm/i915/display/icl_dsi.c | 36 ++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/icl_dsi.c b/drivers/gpu/drm/i915/display/icl_dsi.c
index 8eb2d7f29c82..5ff2a1ffd3ea 100644
--- a/drivers/gpu/drm/i915/display/icl_dsi.c
+++ b/drivers/gpu/drm/i915/display/icl_dsi.c
@@ -704,6 +704,10 @@ gen11_dsi_configure_transcoder(struct intel_encoder *encoder,
 				tmp |= VIDEO_MODE_SYNC_PULSE;
 				break;
 			}
+		} else {
+			tmp &= ~OP_MODE_MASK;
+			tmp |= CMD_MODE_TE_GATE;
+			tmp |= TE_SOURCE_GPIO;
 		}
 
 		I915_WRITE(DSI_TRANS_FUNC_CONF(dsi_trans), tmp);
@@ -953,6 +957,26 @@ static void gen11_dsi_setup_timeouts(struct intel_encoder *encoder)
 	}
 }
 
+static void gen11_dsi_config_util_pin(struct intel_encoder *encoder)
+{
+	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
+	u32 tmp;
+
+	/*
+	 * used as TE i/p for DSI0,
+	 * for dual link/DSI1 TE is from slave DSI1
+	 * through GPIO.
+	 */
+	if (is_vid_mode(intel_dsi) || (intel_dsi->ports & BIT(PORT_B)))
+		return;
+
+	tmp = I915_READ(UTIL_PIN_CTL);
+	tmp |= UTIL_PIN_DIRECTION_INPUT;
+	tmp |= UTIL_PIN_ENABLE;
+	I915_WRITE(UTIL_PIN_CTL, tmp);
+}
+
 static void
 gen11_dsi_enable_port_and_phy(struct intel_encoder *encoder,
 			      const struct intel_crtc_state *pipe_config)
@@ -974,6 +998,9 @@ gen11_dsi_enable_port_and_phy(struct intel_encoder *encoder,
 	/* setup D-PHY timings */
 	gen11_dsi_setup_dphy_timings(encoder);
 
+	/* Since transcoder is configured to take events from GPIO */
+	gen11_dsi_config_util_pin(encoder);
+
 	/* step 4h: setup DSI protocol timeouts */
 	gen11_dsi_setup_timeouts(encoder);
 
@@ -1104,6 +1131,15 @@ static void gen11_dsi_deconfigure_trancoder(struct intel_encoder *encoder)
 	enum transcoder dsi_trans;
 	u32 tmp;
 
+	/* disable periodic update mode */
+	if (is_cmd_mode(intel_dsi)) {
+		for_each_dsi_port(port, intel_dsi->ports) {
+			tmp = I915_READ(DSI_CMD_FRMCTL(port));
+			tmp &= ~DSI_PERIODIC_FRAME_UPDATE_ENABLE;
+			I915_WRITE(DSI_CMD_FRMCTL(port), tmp);
+		}
+	}
+
 	/* put dsi link in ULPS */
 	for_each_dsi_port(port, intel_dsi->ports) {
 		dsi_trans = dsi_port_to_transcoder(port);
-- 
2.21.0.5.gaeb582a