drm: exynos: dsi: Consolidate component and bridge

DSI host registration, attach and detach operations are quite
different for the component and bridge-based DRM drivers.

Supporting generic bridge driver to use both component and bridge
based DRM drivers can be tricky and would require additional host
related operation hooks.

Add host operation hooks for registering and unregistering Exynos
and generic drivers, where Exynos hooks are used in existing Exynos
component based DRM drivers and generic hooks are used in i.MX8M
bridge based DRM drivers.

Add host attach and detach operation hooks for Exynos component
DRM drivers and those get invoked while DSI core host attach and
detach gets called.

Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

1 files changed, 115 insertions, 23 deletions

diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
index bd3bb8622ca3..01ed1677a4fd 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
@@ -283,10 +283,10 @@ struct exynos_dsi_driver_data {
 
 struct exynos_dsi_plat_data {
 	enum exynos_dsi_type hw_type;
+	const struct exynos_dsim_host_ops *host_ops;
 };
 
 struct exynos_dsi {
-	struct drm_encoder encoder;
 	struct mipi_dsi_host dsi_host;
 	struct drm_bridge bridge;
 	struct drm_bridge *out_bridge;
@@ -316,6 +316,19 @@ struct exynos_dsi {
 
 	const struct exynos_dsi_driver_data *driver_data;
 	const struct exynos_dsi_plat_data *plat_data;
+
+	void *priv;
+};
+
+struct exynos_dsim_host_ops {
+	int (*register_host)(struct exynos_dsi *dsim);
+	void (*unregister_host)(struct exynos_dsi *dsim);
+	int (*attach)(struct exynos_dsi *dsim, struct mipi_dsi_device *device);
+	void (*detach)(struct exynos_dsi *dsim, struct mipi_dsi_device *device);
+};
+
+struct exynos_dsi_enc {
+	struct drm_encoder encoder;
 };
 
 #define host_to_dsi(host) container_of(host, struct exynos_dsi, dsi_host)
@@ -1320,7 +1333,8 @@ static irqreturn_t exynos_dsi_irq(int irq, void *dev_id)
 static irqreturn_t exynos_dsi_te_irq_handler(int irq, void *dev_id)
 {
 	struct exynos_dsi *dsi = (struct exynos_dsi *)dev_id;
-	struct drm_encoder *encoder = &dsi->encoder;
+	struct exynos_dsi_enc *dsi_enc = dsi->priv;
+	struct drm_encoder *encoder = &dsi_enc->encoder;
 
 	if (dsi->state & DSIM_STATE_VIDOUT_AVAILABLE)
 		exynos_drm_crtc_te_handler(encoder->crtc);
@@ -1589,9 +1603,8 @@ static int exynos_dsi_host_attach(struct mipi_dsi_host *host,
 				  struct mipi_dsi_device *device)
 {
 	struct exynos_dsi *dsi = host_to_dsi(host);
+	const struct exynos_dsi_plat_data *pdata = dsi->plat_data;
 	struct device *dev = dsi->dev;
-	struct drm_encoder *encoder = &dsi->encoder;
-	struct drm_device *drm = encoder->dev;
 	struct device_node *np = dev->of_node;
 	struct device_node *remote;
 	struct drm_panel *panel;
@@ -1648,11 +1661,6 @@ of_find_panel_or_bridge:
 
 	drm_bridge_add(&dsi->bridge);
 
-	drm_bridge_attach(encoder, &dsi->bridge,
-			  list_first_entry_or_null(&encoder->bridge_chain,
-						   struct drm_bridge,
-						   chain_node), 0);
-
 	/*
 	 * This is a temporary solution and should be made by more generic way.
 	 *
@@ -1665,18 +1673,15 @@ of_find_panel_or_bridge:
 			return ret;
 	}
 
-	mutex_lock(&drm->mode_config.mutex);
+	if (pdata->host_ops && pdata->host_ops->attach) {
+		ret = pdata->host_ops->attach(dsi, device);
+		if (ret)
+			return ret;
+	}
 
 	dsi->lanes = device->lanes;
 	dsi->format = device->format;
 	dsi->mode_flags = device->mode_flags;
-	exynos_drm_crtc_get_by_type(drm, EXYNOS_DISPLAY_TYPE_LCD)->i80_mode =
-			!(dsi->mode_flags & MIPI_DSI_MODE_VIDEO);
-
-	mutex_unlock(&drm->mode_config.mutex);
-
-	if (drm->mode_config.poll_enabled)
-		drm_kms_helper_hotplug_event(drm);
 
 	return 0;
 }
@@ -1685,12 +1690,12 @@ static int exynos_dsi_host_detach(struct mipi_dsi_host *host,
 				  struct mipi_dsi_device *device)
 {
 	struct exynos_dsi *dsi = host_to_dsi(host);
-	struct drm_device *drm = dsi->encoder.dev;
+	const struct exynos_dsi_plat_data *pdata = dsi->plat_data;
 
 	dsi->out_bridge = NULL;
 
-	if (drm->mode_config.poll_enabled)
-		drm_kms_helper_hotplug_event(drm);
+	if (pdata->host_ops && pdata->host_ops->detach)
+		pdata->host_ops->detach(dsi, device);
 
 	exynos_dsi_unregister_te_irq(dsi);
 
@@ -1766,11 +1771,50 @@ static int exynos_dsi_parse_dt(struct exynos_dsi *dsi)
 	return 0;
 }
 
+static int exynos_dsim_host_attach(struct exynos_dsi *dsim,
+				   struct mipi_dsi_device *device)
+{
+	struct exynos_dsi_enc *dsi_enc = dsim->priv;
+	struct drm_encoder *encoder = &dsi_enc->encoder;
+	struct drm_device *drm = encoder->dev;
+
+	drm_bridge_attach(encoder, &dsim->bridge,
+			  list_first_entry_or_null(&encoder->bridge_chain,
+						   struct drm_bridge,
+						   chain_node), 0);
+
+	mutex_lock(&drm->mode_config.mutex);
+
+	dsim->lanes = device->lanes;
+	dsim->format = device->format;
+	dsim->mode_flags = device->mode_flags;
+	exynos_drm_crtc_get_by_type(drm, EXYNOS_DISPLAY_TYPE_LCD)->i80_mode =
+			!(dsim->mode_flags & MIPI_DSI_MODE_VIDEO);
+
+	mutex_unlock(&drm->mode_config.mutex);
+
+	if (drm->mode_config.poll_enabled)
+		drm_kms_helper_hotplug_event(drm);
+
+	return 0;
+}
+
+static void exynos_dsim_host_detach(struct exynos_dsi *dsim,
+				    struct mipi_dsi_device *device)
+{
+	struct exynos_dsi_enc *dsi_enc = dsim->priv;
+	struct drm_device *drm = dsi_enc->encoder.dev;
+
+	if (drm->mode_config.poll_enabled)
+		drm_kms_helper_hotplug_event(drm);
+}
+
 static int exynos_dsi_bind(struct device *dev, struct device *master,
 				void *data)
 {
 	struct exynos_dsi *dsi = dev_get_drvdata(dev);
-	struct drm_encoder *encoder = &dsi->encoder;
+	struct exynos_dsi_enc *dsi_enc = dsi->priv;
+	struct drm_encoder *encoder = &dsi_enc->encoder;
 	struct drm_device *drm_dev = data;
 	int ret;
 
@@ -1788,7 +1832,7 @@ static void exynos_dsi_unbind(struct device *dev, struct device *master,
 {
 	struct exynos_dsi *dsi = dev_get_drvdata(dev);
 
-	exynos_dsi_atomic_disable(&dsi->bridge, NULL);
+	dsi->bridge.funcs->atomic_disable(&dsi->bridge, NULL);
 
 	mipi_dsi_host_unregister(&dsi->dsi_host);
 }
@@ -1798,6 +1842,40 @@ static const struct component_ops exynos_dsi_component_ops = {
 	.unbind	= exynos_dsi_unbind,
 };
 
+static int exynos_dsi_register_host(struct exynos_dsi *dsim)
+{
+	struct exynos_dsi_enc *dsi_enc;
+
+	dsi_enc = devm_kzalloc(dsim->dev, sizeof(*dsi_enc), GFP_KERNEL);
+	if (!dsi_enc)
+		return -ENOMEM;
+
+	dsim->priv = dsi_enc;
+	dsim->bridge.pre_enable_prev_first = true;
+
+	return component_add(dsim->dev, &exynos_dsi_component_ops);
+}
+
+static void exynos_dsi_unregister_host(struct exynos_dsi *dsim)
+{
+	component_del(dsim->dev, &exynos_dsi_component_ops);
+}
+
+static int generic_dsim_register_host(struct exynos_dsi *dsim)
+{
+	return mipi_dsi_host_register(&dsim->dsi_host);
+}
+
+static void generic_dsim_unregister_host(struct exynos_dsi *dsim)
+{
+	mipi_dsi_host_unregister(&dsim->dsi_host);
+}
+
+static const struct exynos_dsim_host_ops generic_dsim_host_ops = {
+	.register_host = generic_dsim_register_host,
+	.unregister_host = generic_dsim_unregister_host,
+};
+
 static const struct drm_bridge_timings dsim_bridge_timings_de_low = {
 	.input_bus_flags = DRM_BUS_FLAG_DE_LOW,
 };
@@ -1892,7 +1970,9 @@ static int exynos_dsi_probe(struct platform_device *pdev)
 	if (dsi->plat_data->hw_type == DSIM_TYPE_IMX8MM)
 		dsi->bridge.timings = &dsim_bridge_timings_de_low;
 
-	ret = component_add(dev, &exynos_dsi_component_ops);
+	if (dsi->plat_data->host_ops && dsi->plat_data->host_ops->register_host)
+		ret = dsi->plat_data->host_ops->register_host(dsi);
+
 	if (ret)
 		goto err_disable_runtime;
 
@@ -1983,24 +2063,36 @@ static const struct dev_pm_ops exynos_dsi_pm_ops = {
 				pm_runtime_force_resume)
 };
 
+static const struct exynos_dsim_host_ops exynos_dsi_host_ops = {
+	.register_host = exynos_dsi_register_host,
+	.unregister_host = exynos_dsi_unregister_host,
+	.attach = exynos_dsim_host_attach,
+	.detach = exynos_dsim_host_detach,
+};
+
 static const struct exynos_dsi_plat_data exynos3250_dsi_pdata = {
 	.hw_type = DSIM_TYPE_EXYNOS3250,
+	.host_ops = &exynos_dsi_host_ops,
 };
 
 static const struct exynos_dsi_plat_data exynos4210_dsi_pdata = {
 	.hw_type = DSIM_TYPE_EXYNOS4210,
+	.host_ops = &exynos_dsi_host_ops,
 };
 
 static const struct exynos_dsi_plat_data exynos5410_dsi_pdata = {
 	.hw_type = DSIM_TYPE_EXYNOS5410,
+	.host_ops = &exynos_dsi_host_ops,
 };
 
 static const struct exynos_dsi_plat_data exynos5422_dsi_pdata = {
 	.hw_type = DSIM_TYPE_EXYNOS5422,
+	.host_ops = &exynos_dsi_host_ops,
 };
 
 static const struct exynos_dsi_plat_data exynos5433_dsi_pdata = {
 	.hw_type = DSIM_TYPE_EXYNOS5433,
+	.host_ops = &exynos_dsi_host_ops,
 };
 
 static const struct of_device_id exynos_dsi_of_match[] = {