[d-kernel] [PATCH 15/35] drm: baikal-vdu: driver compatibility with SDK earlier than 5.9

[Daniil Gnusarev <gnusarevda@basealt.ru>]

In early SDK before version 5.9 in devicetree used separate
description of VDU devices, for HDMI and for LVDS. Later began to
be used jointly. This patch allows to use the driver with old
firmware versions.

Signed-off-by: Daniil Gnusarev <gnusarevda@basealt.ru>
Do-not-upstream: this is a feature of Baikal-M
---
 drivers/gpu/drm/baikal/baikal_vdu_drm.h |  1 +
 drivers/gpu/drm/baikal/baikal_vdu_drv.c | 82 ++++++++++++++++++++-----
 2 files changed, 67 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/baikal/baikal_vdu_drm.h b/drivers/gpu/drm/baikal/baikal_vdu_drm.h
index 432270bebed69b..90dc57bac7ae2c 100644
--- a/drivers/gpu/drm/baikal/baikal_vdu_drm.h
+++ b/drivers/gpu/drm/baikal/baikal_vdu_drm.h
@@ -67,6 +67,7 @@ struct baikal_vdu_crossbar {
 	struct drm_device drm;
 	struct baikal_vdu_private hdmi;
 	struct baikal_vdu_private lvds;
+	int legacy;
 };
 
 struct baikal_lvds_bridge {
diff --git a/drivers/gpu/drm/baikal/baikal_vdu_drv.c b/drivers/gpu/drm/baikal/baikal_vdu_drv.c
index e2a5e6ff03e37d..db7ef4c2027c6c 100644
--- a/drivers/gpu/drm/baikal/baikal_vdu_drv.c
+++ b/drivers/gpu/drm/baikal/baikal_vdu_drv.c
@@ -50,6 +50,9 @@ int mode_override = 0;
 int hdmi_off = 0;
 int lvds_off = 0;
 
+#define legacy_LDVS	1
+#define legacy_HDMI	2
+
 static struct drm_driver vdu_drm_driver;
 
 static struct drm_mode_config_funcs mode_config_funcs = {
@@ -70,10 +73,13 @@ static struct drm_bridge *devm_baikal_get_bridge(struct device *dev,
 	struct drm_bridge *bridge;
 	struct drm_panel *panel;
 	struct fwnode_handle *fwnode;
+	struct drm_device *drm = dev_get_drvdata(dev);
+	struct baikal_vdu_crossbar *crossbar = drm_to_baikal_vdu_crossbar(drm);
 	int ret = 0;
 
 	if (is_of_node(dev->fwnode)) {
-		ret = drm_of_find_panel_or_bridge(to_of_node(dev->fwnode), port,
+		ret = drm_of_find_panel_or_bridge(to_of_node(dev->fwnode),
+						  crossbar->legacy ? 0 : port,
 						  endpoint, &panel, &bridge);
 	} else {
 		if (port == CRTC_HDMI) {
@@ -221,12 +227,18 @@ static int baikal_vdu_allocate_resources(struct platform_device *pdev,
 					 struct baikal_vdu_private *priv)
 {
 	struct device *dev = &pdev->dev;
+	struct drm_device *drm = priv->drm;
+	struct baikal_vdu_crossbar *crossbar = drm_to_baikal_vdu_crossbar(drm);
 	struct resource *mem;
 	int ret;
 
-	mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, priv->regs_name);
-	if (!mem)
-		mem = platform_get_resource(pdev, IORESOURCE_MEM, priv->index);
+	if (crossbar->legacy)
+		mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	else {
+		mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, priv->regs_name);
+		if (!mem)
+			mem = platform_get_resource(pdev, IORESOURCE_MEM, priv->index);
+	}
 
 	if (!mem) {
 		dev_err(dev, "%s %s: no MMIO resource specified\n", __func__, priv->name);
@@ -261,9 +273,14 @@ static int baikal_vdu_allocate_irq(struct platform_device *pdev,
 				   struct baikal_vdu_private *priv)
 {
 	struct device *dev = &pdev->dev;
+	struct drm_device *drm = priv->drm;
+	struct baikal_vdu_crossbar *crossbar = drm_to_baikal_vdu_crossbar(drm);
 	int ret;
 
-	priv->irq = fwnode_irq_get_byname(dev->fwnode, priv->irq_name);
+	if (crossbar->legacy)
+		priv->irq = fwnode_irq_get(dev->fwnode, 0);
+	else
+		priv->irq = fwnode_irq_get_byname(dev->fwnode, priv->irq_name);
 	if (priv->irq < 0) {
 		dev_err(dev, "%s %s: no IRQ resource specified\n", __func__, priv->name);
 		return -EINVAL;
@@ -362,6 +379,8 @@ static int baikal_vdu_drm_probe(struct platform_device *pdev)
 	struct drm_device *drm;
 	struct drm_mode_config *mode_config;
 	struct arm_smccc_res res;
+	struct device_node *node;
+	int node_count;
 	int ret;
 
 	crossbar = devm_drm_dev_alloc(dev, &vdu_drm_driver,
@@ -371,25 +390,54 @@ static int baikal_vdu_drm_probe(struct platform_device *pdev)
 
 	drm = &crossbar->drm;
 	platform_set_drvdata(pdev, drm);
+	crossbar->legacy = 0;
 	hdmi = &crossbar->hdmi;
 	baikal_vdu_set_name(hdmi, CRTC_HDMI, "hdmi");
 	lvds = &crossbar->lvds;
 	baikal_vdu_set_name(lvds, CRTC_LVDS, "lvds");
 
-	ret = baikal_vdu_bridge_init(hdmi, drm);
-	if (ret == -EPROBE_DEFER)
-		goto out_drm;
+	node = NULL;
+	node_count = 0;
+	while ((node = of_find_compatible_node(node, NULL, "baikal,vdu")))
+		node_count++;
+
+	if (node_count > 1) {
+		dev_info(dev, "Found separate description of VDU devices\n");
+		if (device_property_present(dev, "lvds-out")) {
+			// LVDS
+			crossbar->legacy = legacy_LDVS;
+			sprintf(lvds->pclk_name, "pclk");
+			lvds->index = CRTC_LVDS;
+		} else {
+			// HDMI
+			crossbar->legacy = legacy_HDMI;
+			sprintf(hdmi->pclk_name, "pclk");
+			hdmi->index = CRTC_HDMI;
+		}
+	}
 
-	ret = device_property_read_u32(&pdev->dev, "lvds-lanes",
-				       &lvds->num_lanes);
-	if (ret)
-		lvds->num_lanes = 0;
-	if (lvds->num_lanes) {
-		ret = baikal_vdu_bridge_init(lvds, drm);
+	if (crossbar->legacy != legacy_LDVS) {
+		ret = baikal_vdu_bridge_init(hdmi, drm);
 		if (ret == -EPROBE_DEFER)
 			goto out_drm;
 	}
 
+	if (crossbar->legacy != legacy_HDMI) {
+		ret = device_property_read_u32(&pdev->dev, "lvds-lanes",
+					       &lvds->num_lanes);
+		if (ret) {
+			if (crossbar->legacy)
+				lvds->num_lanes = of_graph_get_endpoint_count(dev->of_node);
+			else
+				lvds->num_lanes = 0;
+		}
+		if (lvds->num_lanes) {
+			ret = baikal_vdu_bridge_init(lvds, drm);
+			if (ret == -EPROBE_DEFER)
+				goto out_drm;
+		}
+	}
+
 	drm_mode_config_init(drm);
 	mode_config = &drm->mode_config;
 	mode_config->funcs = &mode_config_funcs;
@@ -399,10 +447,12 @@ static int baikal_vdu_drm_probe(struct platform_device *pdev)
 	mode_config->max_height = 8192;
 
 	hdmi->off = hdmi_off;
-	hdmi->ready = baikal_vdu_resources_init(pdev, hdmi);
+	hdmi->ready = (crossbar->legacy != legacy_LDVS) &&
+			baikal_vdu_resources_init(pdev, hdmi);
 	if (lvds->num_lanes) {
 		lvds->off = lvds_off;
-		lvds->ready = baikal_vdu_resources_init(pdev, lvds);
+		lvds->ready = (crossbar->legacy != legacy_HDMI) &&
+				baikal_vdu_resources_init(pdev, lvds);
 	} else {
 		lvds->ready = 0;
 		lvds->bridge = NULL;
-- 
2.42.2