drm/exynos: mic: Rework initialization

Commit dd8b6803 ("exynos: drm: dsi: Attach in_bridge in MIC driver")
moved Exynos MIC attaching from DSI to MIC driver. However the method
proposed there is incomplete and cannot really work. To properly attach
it to the bridge chain, access to the respective encoder is needed. The
Exynos MIC driver always attaches to the encoder created by the Exynos
DSI driver, so grab it via available helpers for getting access to the
CRTC and encoders. This also requires to change the order of driver
component binding to let DSI to be bound before MIC.

Fixes: dd8b6803 ("exynos: drm: dsi: Attach in_bridge in MIC driver")
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Fixed merge conflict.
Signed-off-by: Inki Dae <inki.dae@samsung.com>

drivers/gpu/drm/exynos/exynos_drm_drv.c

@@ -176,15 +176,15 @@ static struct exynos_drm_driver_info exynos_drm_drivers[] = {
 	}, {
 		DRV_PTR(mixer_driver, CONFIG_DRM_EXYNOS_MIXER),
 		DRM_COMPONENT_DRIVER
-	}, {
-		DRV_PTR(mic_driver, CONFIG_DRM_EXYNOS_MIC),
-		DRM_COMPONENT_DRIVER
 	}, {
 		DRV_PTR(dp_driver, CONFIG_DRM_EXYNOS_DP),
 		DRM_COMPONENT_DRIVER
 	}, {
 		DRV_PTR(dsi_driver, CONFIG_DRM_EXYNOS_DSI),
 		DRM_COMPONENT_DRIVER
+	}, {
+		DRV_PTR(mic_driver, CONFIG_DRM_EXYNOS_MIC),
+		DRM_COMPONENT_DRIVER
 	}, {
 		DRV_PTR(hdmi_driver, CONFIG_DRM_EXYNOS_HDMI),
 		DRM_COMPONENT_DRIVER

drivers/gpu/drm/exynos/exynos_drm_mic.c

@@ -26,6 +26,7 @@
 #include <drm/drm_print.h>
 
 #include "exynos_drm_drv.h"
+#include "exynos_drm_crtc.h"
 
 /* Sysreg registers for MIC */
 #define DSD_CFG_MUX	0x1004
@@ -100,9 +101,7 @@ struct exynos_mic {
 
 	bool i80_mode;
 	struct videomode vm;
-	struct drm_encoder *encoder;
 	struct drm_bridge bridge;
-	struct drm_bridge *next_bridge;
 
 	bool enabled;
 };
@@ -229,8 +228,6 @@ static void mic_set_reg_on(struct exynos_mic *mic, bool enable)
 	writel(reg, mic->reg + MIC_OP);
 }
 
-static void mic_disable(struct drm_bridge *bridge) { }
-
 static void mic_post_disable(struct drm_bridge *bridge)
 {
 	struct exynos_mic *mic = bridge->driver_private;
@@ -297,34 +294,30 @@ static void mic_pre_enable(struct drm_bridge *bridge)
 	mutex_unlock(&mic_mutex);
 }
 
-static void mic_enable(struct drm_bridge *bridge) { }
-
-static int mic_attach(struct drm_bridge *bridge,
-		      enum drm_bridge_attach_flags flags)
-{
-	struct exynos_mic *mic = bridge->driver_private;
-
-	return drm_bridge_attach(bridge->encoder, mic->next_bridge,
-				 &mic->bridge, flags);
-}
-
 static const struct drm_bridge_funcs mic_bridge_funcs = {
-	.disable = mic_disable,
 	.post_disable = mic_post_disable,
 	.mode_set = mic_mode_set,
 	.pre_enable = mic_pre_enable,
-	.enable = mic_enable,
-	.attach = mic_attach,
 };
 
 static int exynos_mic_bind(struct device *dev, struct device *master,
 			   void *data)
 {
 	struct exynos_mic *mic = dev_get_drvdata(dev);
+	struct drm_device *drm_dev = data;
+	struct exynos_drm_crtc *crtc = exynos_drm_crtc_get_by_type(drm_dev,
+						       EXYNOS_DISPLAY_TYPE_LCD);
+	struct drm_encoder *e, *encoder = NULL;
+
+	drm_for_each_encoder(e, drm_dev)
+		if (e->possible_crtcs == drm_crtc_mask(&crtc->base))
+			encoder = e;
+	if (!encoder)
+		return -ENODEV;
 
 	mic->bridge.driver_private = mic;
 
-	return 0;
+	return drm_bridge_attach(encoder, &mic->bridge, NULL, 0);
 }
 
 static void exynos_mic_unbind(struct device *dev, struct device *master,
@@ -388,7 +381,6 @@ static int exynos_mic_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct exynos_mic *mic;
-	struct device_node *remote;
 	struct resource res;
 	int ret, i;
 
@@ -432,16 +424,6 @@ static int exynos_mic_probe(struct platform_device *pdev)
 		}
 	}
 
-	remote = of_graph_get_remote_node(dev->of_node, 1, 0);
-	mic->next_bridge = of_drm_find_bridge(remote);
-	if (!mic->next_bridge) {
-		DRM_DEV_ERROR(dev, "mic: Failed to find next bridge\n");
-		ret = -EPROBE_DEFER;
-		goto err;
-	}
-
-	of_node_put(remote);
-
 	platform_set_drvdata(pdev, mic);
 
 	mic->bridge.funcs = &mic_bridge_funcs;