[PATCH 03/18] drm/i915/dsi: Move calling of wait_for_dsi_fifo_empty to mipi_exec_send_packet

[Hans de Goede]

Instead of calling wait_for_dsi_fifo_empty on all dsi ports after calling
a drm_panel_foo helper which calls VBT sequences, move it to the VBT
mipi_exec_send_packet helper, which is the one VBT instruction which
actually puts data in the fifo.

This results in a nice cleanup making it clearer what all the steps on
intel_dsi_enable / disable are and this also makes the VBT code properly
wait till a command has actually been send before executing the next
steps (typically a delay) in the VBT sequence.

Signed-off-by: Hans de Goede <hdegoede at redhat.com>
---
 drivers/gpu/drm/i915/intel_dsi.c           | 12 +-----------
 drivers/gpu/drm/i915/intel_dsi.h           |  2 ++
 drivers/gpu/drm/i915/intel_dsi_panel_vbt.c |  2 ++
 3 files changed, 5 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
index 3bc6213..587ba07 100644
--- a/drivers/gpu/drm/i915/intel_dsi.c
+++ b/drivers/gpu/drm/i915/intel_dsi.c
@@ -80,7 +80,7 @@ enum mipi_dsi_pixel_format pixel_format_from_register_bits(u32 fmt)
 	}
 }
 
-static void wait_for_dsi_fifo_empty(struct intel_dsi *intel_dsi, enum port port)
+void wait_for_dsi_fifo_empty(struct intel_dsi *intel_dsi, enum port port)
 {
 	struct drm_encoder *encoder = &intel_dsi->base.base;
 	struct drm_device *dev = encoder->dev;
@@ -528,9 +528,6 @@ static void intel_dsi_enable(struct intel_encoder *encoder)
 
 		drm_panel_enable(intel_dsi->panel);
 
-		for_each_dsi_port(port, intel_dsi->ports)
-			wait_for_dsi_fifo_empty(intel_dsi, port);
-
 		intel_dsi_port_enable(encoder);
 	}
 
@@ -546,7 +543,6 @@ static void intel_dsi_pre_enable(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);
-	enum port port;
 
 	DRM_DEBUG_KMS("\n");
 
@@ -579,9 +575,6 @@ static void intel_dsi_pre_enable(struct intel_encoder *encoder,
 
 	drm_panel_prepare(intel_dsi->panel);
 
-	for_each_dsi_port(port, intel_dsi->ports)
-		wait_for_dsi_fifo_empty(intel_dsi, port);
-
 	/* Enable port in pre-enable phase itself because as per hw team
 	 * recommendation, port should be enabled befor plane & pipe */
 	intel_dsi_enable(encoder);
@@ -652,9 +645,6 @@ static void intel_dsi_disable(struct intel_encoder *encoder)
 	/* if disable packets are sent before sending shutdown packet then in
 	 * some next enable sequence send turn on packet error is observed */
 	drm_panel_disable(intel_dsi->panel);
-
-	for_each_dsi_port(port, intel_dsi->ports)
-		wait_for_dsi_fifo_empty(intel_dsi, port);
 }
 
 static void intel_dsi_clear_device_ready(struct intel_encoder *encoder)
diff --git a/drivers/gpu/drm/i915/intel_dsi.h b/drivers/gpu/drm/i915/intel_dsi.h
index 5967ea6..d567823 100644
--- a/drivers/gpu/drm/i915/intel_dsi.h
+++ b/drivers/gpu/drm/i915/intel_dsi.h
@@ -130,6 +130,8 @@ static inline struct intel_dsi *enc_to_intel_dsi(struct drm_encoder *encoder)
 	return container_of(encoder, struct intel_dsi, base.base);
 }
 
+void wait_for_dsi_fifo_empty(struct intel_dsi *intel_dsi, enum port port);
+
 bool intel_dsi_pll_is_enabled(struct drm_i915_private *dev_priv);
 int intel_compute_dsi_pll(struct intel_encoder *encoder,
 			  struct intel_crtc_state *config);
diff --git a/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c b/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
index 47cd1b2..b5a02c6 100644
--- a/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
+++ b/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
@@ -191,6 +191,8 @@ static const u8 *mipi_exec_send_packet(struct intel_dsi *intel_dsi,
 		break;
 	}
 
+	wait_for_dsi_fifo_empty(intel_dsi, port);
+
 out:
 	data += len;
 
-- 
2.9.3