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Date:   Thu, 4 Jul 2019 06:30:53 +0000
From:   "james qian wang (Arm Technology China)" <james.qian.wang@....com>
To:     Liviu Dudau <Liviu.Dudau@....com>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        Brian Starkey <Brian.Starkey@....com>,
        "maarten.lankhorst@...ux.intel.com" 
        <maarten.lankhorst@...ux.intel.com>,
        "sean@...rly.run" <sean@...rly.run>
CC:     "Jonathan Chai (Arm Technology China)" <Jonathan.Chai@....com>,
        "Julien Yin (Arm Technology China)" <Julien.Yin@....com>,
        "thomas Sun (Arm Technology China)" <thomas.Sun@....com>,
        "Lowry Li (Arm Technology China)" <Lowry.Li@....com>,
        Ayan Halder <Ayan.Halder@....com>,
        "Tiannan Zhu (Arm Technology China)" <Tiannan.Zhu@....com>,
        "Yiqi Kang (Arm Technology China)" <Yiqi.Kang@....com>,
        nd <nd@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        Ben Davis <Ben.Davis@....com>,
        "Oscar Zhang (Arm Technology China)" <Oscar.Zhang@....com>,
        "Channing Chen (Arm Technology China)" <Channing.Chen@....com>,
        "james qian wang (Arm Technology China)" <james.qian.wang@....com>
Subject: [PATCH 1/6] drm/komeda: Add side by side assembling

Komeda HW can support side by side, which splits the internal display
processing to two single halves (LEFT/RIGHT) and handle them by two
pipelines separately.
komeda "side by side" is enabled by DT property: "side_by_side_master",
once DT configured side by side, komeda need to verify it with HW's
configuration, and assemble it for the further usage.

Signed-off-by: James Qian Wang (Arm Technology China) <james.qian.wang@....com>
---
 .../gpu/drm/arm/display/komeda/komeda_crtc.c  |  9 +++-
 .../gpu/drm/arm/display/komeda/komeda_dev.c   |  3 ++
 .../gpu/drm/arm/display/komeda/komeda_dev.h   |  9 ++++
 .../gpu/drm/arm/display/komeda/komeda_kms.h   |  3 ++
 .../drm/arm/display/komeda/komeda_pipeline.c  | 50 +++++++++++++++++--
 .../drm/arm/display/komeda/komeda_pipeline.h  |  1 +
 6 files changed, 69 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
index 3744e6d1ba96..c3bb111c454c 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
@@ -591,16 +591,21 @@ int komeda_kms_setup_crtcs(struct komeda_kms_dev *kms,

 		crtc->master = master;
 		crtc->slave  = komeda_pipeline_get_slave(master);
+		crtc->side_by_side = mdev->side_by_side;

 		if (crtc->slave)
 			sprintf(str, "pipe-%d", crtc->slave->id);
 		else
 			sprintf(str, "None");

-		DRM_INFO("CRTC-%d: master(pipe-%d) slave(%s).\n",
-			 kms->n_crtcs, master->id, str);
+		DRM_INFO("CRTC-%d: master(pipe-%d) slave(%s) sbs(%s).\n",
+			 kms->n_crtcs, master->id, str,
+			 crtc->side_by_side ? "On" : "Off");

 		kms->n_crtcs++;
+
+		if (mdev->side_by_side)
+			break;
 	}

 	return 0;
diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_dev.c b/drivers/gpu/drm/arm/display/komeda/komeda_dev.c
index bb72642cfd67..2aee735a683f 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_dev.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_dev.c
@@ -191,6 +191,9 @@ static int komeda_parse_dt(struct device *dev, struct komeda_dev *mdev)
 		}
 	}

+	mdev->side_by_side = !of_property_read_u32(np, "side_by_side_master",
+					&mdev->side_by_side_master);
+
 	return ret;
 }

diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_dev.h b/drivers/gpu/drm/arm/display/komeda/komeda_dev.h
index e863ec327790..c70cc25d246f 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_dev.h
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_dev.h
@@ -176,6 +176,15 @@ struct komeda_dev {

 	/** @irq: irq number */
 	int irq;
+	/**
+	 * @side_by_side:
+	 *
+	 * on sbs the whole display frame will be split to two halves (1:2),
+	 * master pipeline handles the left part, slave for the right part
+	 */
+	bool side_by_side;
+	/** @side_by_side_master: master pipe id for side by side */
+	int side_by_side_master;

 	/** @lock: used to protect dpmode */
 	struct mutex lock;
diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_kms.h b/drivers/gpu/drm/arm/display/komeda/komeda_kms.h
index d0cf8381d2ab..0dbfd7ad7805 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_kms.h
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_kms.h
@@ -84,6 +84,9 @@ struct komeda_crtc {
 	 */
 	struct komeda_pipeline *slave;

+	/** @side_by_side: if the master and slave works on side by side mode */
+	bool side_by_side;
+
 	/** @slave_planes: komeda slave planes mask */
 	u32 slave_planes;

diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.c b/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.c
index 452e505a1fd3..104e27cc1dc3 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.c
@@ -326,14 +326,56 @@ static void komeda_pipeline_assemble(struct komeda_pipeline *pipe)
 struct komeda_pipeline *
 komeda_pipeline_get_slave(struct komeda_pipeline *master)
 {
-	struct komeda_component *slave;
+	struct komeda_dev *mdev = master->mdev;
+	struct komeda_component *comp, *slave;
+	u32 avail_inputs;
+
+	/* on SBS, slave pipeline merge to master via image processor */
+	if (mdev->side_by_side) {
+		comp = &master->improc->base;
+		avail_inputs = KOMEDA_PIPELINE_IMPROCS;
+	} else {
+		comp = &master->compiz->base;
+		avail_inputs = KOMEDA_PIPELINE_COMPIZS;
+	}

-	slave = komeda_component_pickup_input(&master->compiz->base,
-					      KOMEDA_PIPELINE_COMPIZS);
+	slave = komeda_component_pickup_input(comp, avail_inputs);

 	return slave ? slave->pipeline : NULL;
 }

+static int komeda_assemble_side_by_side(struct komeda_dev *mdev)
+{
+	struct komeda_pipeline *master, *slave;
+	int i;
+
+	if (!mdev->side_by_side)
+		return 0;
+
+	if (mdev->side_by_side_master >= mdev->n_pipelines) {
+		DRM_ERROR("DT configured side by side master-%d is invalid.\n",
+			  mdev->side_by_side_master);
+		return -EINVAL;
+	}
+
+	master = mdev->pipelines[mdev->side_by_side_master];
+	slave = komeda_pipeline_get_slave(master);
+	if (!slave || slave->n_layers != master->n_layers) {
+		DRM_ERROR("Current HW doesn't support side by side.\n");
+		return -EINVAL;
+	}
+
+	if (!master->dual_link) {
+		DRM_DEBUG_ATOMIC("SBS can not work without dual link.\n");
+		return -EINVAL;
+	}
+
+	for (i = 0; i < master->n_layers; i++)
+		master->layers[i]->sbs_slave = slave->layers[i];
+
+	return 0;
+}
+
 int komeda_assemble_pipelines(struct komeda_dev *mdev)
 {
 	struct komeda_pipeline *pipe;
@@ -346,7 +388,7 @@ int komeda_assemble_pipelines(struct komeda_dev *mdev)
 		komeda_pipeline_dump(pipe);
 	}

-	return 0;
+	return komeda_assemble_side_by_side(mdev);
 }

 void komeda_pipeline_dump_register(struct komeda_pipeline *pipe,
diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h b/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h
index 66d76642bc5b..6d3745bb8c1d 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h
@@ -236,6 +236,7 @@ struct komeda_layer {
 	 * not the source buffer.
 	 */
 	struct komeda_layer *right;
+	struct komeda_layer *sbs_slave;
 };

 struct komeda_layer_state {
--
2.20.1

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