[Intel-gfx] [V11 4/4] drm/i915/dsi: Initiate fame request in cmd mode

[Vandita Kulkarni]

In TE Gate mode or TE NO_GATE mode on every flip
we need to set the frame update request bit.
After this  bit is set transcoder hardware will
automatically send the frame data to the panel
in case of TE NO_GATE mode, where it sends after
it receives the TE event in case of TE_GATE mode.
Once the frame data is sent to the panel, we see
the frame counter updating.

v2: Use intel_de_read/write

v3: remove the usage of private_flags

v4: Use icl_dsi in func names if non static,
    fix code formatting issues. (Jani)

Signed-off-by: Vandita Kulkarni <vandita.kulkarni at intel.com>
---
 drivers/gpu/drm/i915/display/icl_dsi.c       | 26 ++++++++++++++++++++
 drivers/gpu/drm/i915/display/intel_display.c | 10 ++++++++
 drivers/gpu/drm/i915/display/intel_dsi.h     |  1 +
 3 files changed, 37 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/icl_dsi.c b/drivers/gpu/drm/i915/display/icl_dsi.c
index 2789020e20db..7d2abc7f6ba3 100644
--- a/drivers/gpu/drm/i915/display/icl_dsi.c
+++ b/drivers/gpu/drm/i915/display/icl_dsi.c
@@ -205,6 +205,32 @@ static int dsi_send_pkt_payld(struct intel_dsi_host *host,
 	return 0;
 }
 
+void icl_dsi_frame_update(struct intel_crtc_state *crtc_state)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+	u32 tmp, flags;
+	enum port port;
+
+	flags = crtc->mode_flags;
+
+	/*
+	 * case 1 also covers dual link
+	 * In case of dual link, frame update should be set on
+	 * DSI_0
+	 */
+	if (flags & I915_MODE_FLAG_DSI_USE_TE0)
+		port = PORT_A;
+	else if (flags & I915_MODE_FLAG_DSI_USE_TE1)
+		port = PORT_B;
+	else
+		return;
+
+	tmp = intel_de_read(dev_priv, DSI_CMD_FRMCTL(port));
+	tmp |= DSI_FRAME_UPDATE_REQUEST;
+	intel_de_write(dev_priv, DSI_CMD_FRMCTL(port), tmp);
+}
+
 static void dsi_program_swing_and_deemphasis(struct intel_encoder *encoder)
 {
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index f862403388f6..11a20bf2255f 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -15621,6 +15621,16 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
 		intel_set_cdclk_post_plane_update(state);
 	}
 
+	/*
+	 * Incase of mipi dsi command mode, we need to set frame update
+	 * for every commit
+	 */
+	for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i)
+		if (INTEL_GEN(dev_priv) >= 11 &&
+		    intel_crtc_has_type(new_crtc_state, INTEL_OUTPUT_DSI))
+			if (new_crtc_state->hw.active)
+				icl_dsi_frame_update(new_crtc_state);
+
 	/* FIXME: We should call drm_atomic_helper_commit_hw_done() here
 	 * already, but still need the state for the delayed optimization. To
 	 * fix this:
diff --git a/drivers/gpu/drm/i915/display/intel_dsi.h b/drivers/gpu/drm/i915/display/intel_dsi.h
index 19f78a4022d3..625f2f1ae061 100644
--- a/drivers/gpu/drm/i915/display/intel_dsi.h
+++ b/drivers/gpu/drm/i915/display/intel_dsi.h
@@ -167,6 +167,7 @@ static inline u16 intel_dsi_encoder_ports(struct intel_encoder *encoder)
 
 /* icl_dsi.c */
 void icl_dsi_init(struct drm_i915_private *dev_priv);
+void icl_dsi_frame_update(struct intel_crtc_state *crtc_state);
 
 /* intel_dsi.c */
 int intel_dsi_bitrate(const struct intel_dsi *intel_dsi);
-- 
2.21.0.5.gaeb582a