drm: rcar-du: Add HDMI encoder and connector support

SoCs that integrate the DU have no internal HDMI encoder, support
external encoders only.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

9 files changed, 375 insertions, 7 deletions

diff --git a/drivers/gpu/drm/rcar-du/Kconfig b/drivers/gpu/drm/rcar-du/Kconfig
index c96f6089f8bf..2324a526de65 100644
--- a/drivers/gpu/drm/rcar-du/Kconfig
+++ b/drivers/gpu/drm/rcar-du/Kconfig
@@ -11,10 +11,17 @@ config DRM_RCAR_DU
           Choose this option if you have an R-Car chipset.
           If M is selected the module will be called rcar-du-drm.
 
+config DRM_RCAR_HDMI
+        bool "R-Car DU HDMI Encoder Support"
+        depends on DRM_RCAR_DU
+        depends on OF
+        help
+          Enable support for external HDMI encoders.
+
 config DRM_RCAR_LVDS
         bool "R-Car DU LVDS Encoder Support"
         depends on DRM_RCAR_DU
         depends on ARCH_R8A7790 || ARCH_R8A7791 || COMPILE_TEST
         help
-          Enable support the R-Car Display Unit embedded LVDS encoders
-          (currently only on R8A7790).
+          Enable support for the R-Car Display Unit embedded LVDS encoders
+          (currently only on R8A7790 and R8A7791).
diff --git a/drivers/gpu/drm/rcar-du/Makefile b/drivers/gpu/drm/rcar-du/Makefile
index 12b8d4477835..05de1c4097af 100644
--- a/drivers/gpu/drm/rcar-du/Makefile
+++ b/drivers/gpu/drm/rcar-du/Makefile
@@ -7,6 +7,8 @@ rcar-du-drm-y := rcar_du_crtc.o \
                  rcar_du_plane.o \
                  rcar_du_vgacon.o
 
+rcar-du-drm-$(CONFIG_DRM_RCAR_HDMI)     += rcar_du_hdmicon.o \
+                                           rcar_du_hdmienc.o
 rcar-du-drm-$(CONFIG_DRM_RCAR_LVDS)     += rcar_du_lvdsenc.o
 
 obj-$(CONFIG_DRM_RCAR_DU)               += rcar-du-drm.o
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_encoder.c b/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
index e88e63b06b09..34a122a39664 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
@@ -19,6 +19,8 @@
 
 #include "rcar_du_drv.h"
 #include "rcar_du_encoder.h"
+#include "rcar_du_hdmicon.h"
+#include "rcar_du_hdmienc.h"
 #include "rcar_du_kms.h"
 #include "rcar_du_lvdscon.h"
 #include "rcar_du_lvdsenc.h"
@@ -177,6 +179,9 @@ int rcar_du_encoder_init(struct rcar_du_device *rcdu,
         case RCAR_DU_ENCODER_LVDS:
                 encoder_type = DRM_MODE_ENCODER_LVDS;
                 break;
+        case RCAR_DU_ENCODER_HDMI:
+                encoder_type = DRM_MODE_ENCODER_TMDS;
+                break;
         case RCAR_DU_ENCODER_NONE:
         default:
                 /* No external encoder, use the internal encoder type. */
@@ -184,12 +189,24 @@ int rcar_du_encoder_init(struct rcar_du_device *rcdu,
                 break;
         }
 
-        ret = drm_encoder_init(rcdu->ddev, encoder, &encoder_funcs,
-                               encoder_type);
-        if (ret < 0)
-                return ret;
+        if (type == RCAR_DU_ENCODER_HDMI) {
+                if (renc->lvds) {
+                        dev_err(rcdu->dev,
+                                "Chaining LVDS and HDMI encoders not supported\n");
+                        return -EINVAL;
+                }
 
-        drm_encoder_helper_add(encoder, &encoder_helper_funcs);
+                ret = rcar_du_hdmienc_init(rcdu, renc, enc_node);
+                if (ret < 0)
+                        return ret;
+        } else {
+                ret = drm_encoder_init(rcdu->ddev, encoder, &encoder_funcs,
+                                       encoder_type);
+                if (ret < 0)
+                        return ret;
+
+                drm_encoder_helper_add(encoder, &encoder_helper_funcs);
+        }
 
         switch (encoder_type) {
         case DRM_MODE_ENCODER_LVDS:
@@ -198,6 +215,9 @@ int rcar_du_encoder_init(struct rcar_du_device *rcdu,
         case DRM_MODE_ENCODER_DAC:
                 return rcar_du_vga_connector_init(rcdu, renc);
 
+        case DRM_MODE_ENCODER_TMDS:
+                return rcar_du_hdmi_connector_init(rcdu, renc);
+
         default:
                 return -EINVAL;
         }
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_encoder.h b/drivers/gpu/drm/rcar-du/rcar_du_encoder.h
index c4dccdbcff33..719b6f2a031c 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_encoder.h
+++ b/drivers/gpu/drm/rcar-du/rcar_du_encoder.h
@@ -18,6 +18,7 @@
 #include <drm/drm_encoder_slave.h>
 
 struct rcar_du_device;
+struct rcar_du_hdmienc;
 struct rcar_du_lvdsenc;
 
 enum rcar_du_encoder_type {
@@ -25,11 +26,13 @@ enum rcar_du_encoder_type {
         RCAR_DU_ENCODER_NONE,
         RCAR_DU_ENCODER_VGA,
         RCAR_DU_ENCODER_LVDS,
+        RCAR_DU_ENCODER_HDMI,
 };
 
 struct rcar_du_encoder {
         struct drm_encoder_slave slave;
         enum rcar_du_output output;
+        struct rcar_du_hdmienc *hdmi;
         struct rcar_du_lvdsenc *lvds;
 };
 
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_hdmicon.c b/drivers/gpu/drm/rcar-du/rcar_du_hdmicon.c
new file mode 100644
index 000000000000..8abaaf258f45
--- /dev/null
+++ b/drivers/gpu/drm/rcar-du/rcar_du_hdmicon.c
@@ -0,0 +1,118 @@
+/*
+ * R-Car Display Unit HDMI Connector
+ *
+ * Copyright (C) 2014 Renesas Electronics Corporation
+ *
+ * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <drm/drmP.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_encoder_slave.h>
+
+#include "rcar_du_drv.h"
+#include "rcar_du_encoder.h"
+#include "rcar_du_hdmicon.h"
+#include "rcar_du_kms.h"
+
+#define to_slave_funcs(e)       (to_rcar_encoder(e)->slave.slave_funcs)
+
+static int rcar_du_hdmi_connector_get_modes(struct drm_connector *connector)
+{
+        struct drm_encoder *encoder = connector->encoder;
+        struct drm_encoder_slave_funcs *sfuncs = to_slave_funcs(encoder);
+
+        if (sfuncs->get_modes == NULL)
+                return 0;
+
+        return sfuncs->get_modes(encoder, connector);
+}
+
+static int rcar_du_hdmi_connector_mode_valid(struct drm_connector *connector,
+                                             struct drm_display_mode *mode)
+{
+        struct drm_encoder *encoder = connector->encoder;
+        struct drm_encoder_slave_funcs *sfuncs = to_slave_funcs(encoder);
+
+        if (sfuncs->mode_valid == NULL)
+                return MODE_OK;
+
+        return sfuncs->mode_valid(encoder, mode);
+}
+
+static const struct drm_connector_helper_funcs connector_helper_funcs = {
+        .get_modes = rcar_du_hdmi_connector_get_modes,
+        .mode_valid = rcar_du_hdmi_connector_mode_valid,
+        .best_encoder = rcar_du_connector_best_encoder,
+};
+
+static void rcar_du_hdmi_connector_destroy(struct drm_connector *connector)
+{
+        drm_connector_unregister(connector);
+        drm_connector_cleanup(connector);
+}
+
+static enum drm_connector_status
+rcar_du_hdmi_connector_detect(struct drm_connector *connector, bool force)
+{
+        struct drm_encoder *encoder = connector->encoder;
+        struct drm_encoder_slave_funcs *sfuncs = to_slave_funcs(encoder);
+
+        if (sfuncs->detect == NULL)
+                return connector_status_unknown;
+
+        return sfuncs->detect(encoder, connector);
+}
+
+static const struct drm_connector_funcs connector_funcs = {
+        .dpms = drm_helper_connector_dpms,
+        .detect = rcar_du_hdmi_connector_detect,
+        .fill_modes = drm_helper_probe_single_connector_modes,
+        .destroy = rcar_du_hdmi_connector_destroy,
+};
+
+int rcar_du_hdmi_connector_init(struct rcar_du_device *rcdu,
+                                struct rcar_du_encoder *renc)
+{
+        struct drm_encoder *encoder = rcar_encoder_to_drm_encoder(renc);
+        struct rcar_du_connector *rcon;
+        struct drm_connector *connector;
+        int ret;
+
+        rcon = devm_kzalloc(rcdu->dev, sizeof(*rcon), GFP_KERNEL);
+        if (rcon == NULL)
+                return -ENOMEM;
+
+        connector = &rcon->connector;
+        connector->display_info.width_mm = 0;
+        connector->display_info.height_mm = 0;
+
+        ret = drm_connector_init(rcdu->ddev, connector, &connector_funcs,
+                                 DRM_MODE_CONNECTOR_HDMIA);
+        if (ret < 0)
+                return ret;
+
+        drm_connector_helper_add(connector, &connector_helper_funcs);
+        ret = drm_connector_register(connector);
+        if (ret < 0)
+                return ret;
+
+        drm_helper_connector_dpms(connector, DRM_MODE_DPMS_OFF);
+        drm_object_property_set_value(&connector->base,
+                rcdu->ddev->mode_config.dpms_property, DRM_MODE_DPMS_OFF);
+
+        ret = drm_mode_connector_attach_encoder(connector, encoder);
+        if (ret < 0)
+                return ret;
+
+        connector->encoder = encoder;
+        rcon->encoder = renc;
+
+        return 0;
+}
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_hdmicon.h b/drivers/gpu/drm/rcar-du/rcar_du_hdmicon.h
new file mode 100644
index 000000000000..87daa949227f
--- /dev/null
+++ b/drivers/gpu/drm/rcar-du/rcar_du_hdmicon.h
@@ -0,0 +1,31 @@
+/*
+ * R-Car Display Unit HDMI Connector
+ *
+ * Copyright (C) 2014 Renesas Electronics Corporation
+ *
+ * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef __RCAR_DU_HDMICON_H__
+#define __RCAR_DU_HDMICON_H__
+
+struct rcar_du_device;
+struct rcar_du_encoder;
+
+#if IS_ENABLED(CONFIG_DRM_RCAR_HDMI)
+int rcar_du_hdmi_connector_init(struct rcar_du_device *rcdu,
+                                struct rcar_du_encoder *renc);
+#else
+static inline int rcar_du_hdmi_connector_init(struct rcar_du_device *rcdu,
+                                              struct rcar_du_encoder *renc)
+{
+        return -ENOSYS;
+}
+#endif
+
+#endif /* __RCAR_DU_HDMICON_H__ */
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_hdmienc.c b/drivers/gpu/drm/rcar-du/rcar_du_hdmienc.c
new file mode 100644
index 000000000000..359bc999a9c8
--- /dev/null
+++ b/drivers/gpu/drm/rcar-du/rcar_du_hdmienc.c
@@ -0,0 +1,151 @@
+/*
+ * R-Car Display Unit HDMI Encoder
+ *
+ * Copyright (C) 2014 Renesas Electronics Corporation
+ *
+ * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/slab.h>
+
+#include <drm/drmP.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_encoder_slave.h>
+
+#include "rcar_du_drv.h"
+#include "rcar_du_encoder.h"
+#include "rcar_du_hdmienc.h"
+
+struct rcar_du_hdmienc {
+        struct rcar_du_encoder *renc;
+        struct device *dev;
+        int dpms;
+};
+
+#define to_rcar_hdmienc(e)      (to_rcar_encoder(e)->hdmi)
+#define to_slave_funcs(e)       (to_rcar_encoder(e)->slave.slave_funcs)
+
+static void rcar_du_hdmienc_dpms(struct drm_encoder *encoder, int mode)
+{
+        struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
+        struct drm_encoder_slave_funcs *sfuncs = to_slave_funcs(encoder);
+
+        if (hdmienc->dpms == mode)
+                return;
+
+        if (sfuncs->dpms)
+                sfuncs->dpms(encoder, mode);
+
+        hdmienc->dpms = mode;
+}
+
+static bool rcar_du_hdmienc_mode_fixup(struct drm_encoder *encoder,
+                                       const struct drm_display_mode *mode,
+                                       struct drm_display_mode *adjusted_mode)
+{
+        struct drm_encoder_slave_funcs *sfuncs = to_slave_funcs(encoder);
+
+        if (sfuncs->mode_fixup == NULL)
+                return true;
+
+        return sfuncs->mode_fixup(encoder, mode, adjusted_mode);
+}
+
+static void rcar_du_hdmienc_mode_prepare(struct drm_encoder *encoder)
+{
+        rcar_du_hdmienc_dpms(encoder, DRM_MODE_DPMS_OFF);
+}
+
+static void rcar_du_hdmienc_mode_commit(struct drm_encoder *encoder)
+{
+        rcar_du_hdmienc_dpms(encoder, DRM_MODE_DPMS_ON);
+}
+
+static void rcar_du_hdmienc_mode_set(struct drm_encoder *encoder,
+                                     struct drm_display_mode *mode,
+                                     struct drm_display_mode *adjusted_mode)
+{
+        struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
+        struct drm_encoder_slave_funcs *sfuncs = to_slave_funcs(encoder);
+
+        if (sfuncs->mode_set)
+                sfuncs->mode_set(encoder, mode, adjusted_mode);
+
+        rcar_du_crtc_route_output(encoder->crtc, hdmienc->renc->output);
+}
+
+static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
+        .dpms = rcar_du_hdmienc_dpms,
+        .mode_fixup = rcar_du_hdmienc_mode_fixup,
+        .prepare = rcar_du_hdmienc_mode_prepare,
+        .commit = rcar_du_hdmienc_mode_commit,
+        .mode_set = rcar_du_hdmienc_mode_set,
+};
+
+static void rcar_du_hdmienc_cleanup(struct drm_encoder *encoder)
+{
+        struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
+
+        rcar_du_hdmienc_dpms(encoder, DRM_MODE_DPMS_OFF);
+
+        drm_encoder_cleanup(encoder);
+        put_device(hdmienc->dev);
+}
+
+static const struct drm_encoder_funcs encoder_funcs = {
+        .destroy = rcar_du_hdmienc_cleanup,
+};
+
+int rcar_du_hdmienc_init(struct rcar_du_device *rcdu,
+                         struct rcar_du_encoder *renc, struct device_node *np)
+{
+        struct drm_encoder *encoder = rcar_encoder_to_drm_encoder(renc);
+        struct drm_i2c_encoder_driver *driver;
+        struct i2c_client *i2c_slave;
+        struct rcar_du_hdmienc *hdmienc;
+        int ret;
+
+        hdmienc = devm_kzalloc(rcdu->dev, sizeof(*hdmienc), GFP_KERNEL);
+        if (hdmienc == NULL)
+                return -ENOMEM;
+
+        /* Locate the slave I2C device and driver. */
+        i2c_slave = of_find_i2c_device_by_node(np);
+        if (!i2c_slave || !i2c_get_clientdata(i2c_slave))
+                return -EPROBE_DEFER;
+
+        hdmienc->dev = &i2c_slave->dev;
+
+        if (hdmienc->dev->driver == NULL) {
+                ret = -EPROBE_DEFER;
+                goto error;
+        }
+
+        /* Initialize the slave encoder. */
+        driver = to_drm_i2c_encoder_driver(to_i2c_driver(hdmienc->dev->driver));
+        ret = driver->encoder_init(i2c_slave, rcdu->ddev, &renc->slave);
+        if (ret < 0)
+                goto error;
+
+        ret = drm_encoder_init(rcdu->ddev, encoder, &encoder_funcs,
+                               DRM_MODE_ENCODER_TMDS);
+        if (ret < 0)
+                goto error;
+
+        drm_encoder_helper_add(encoder, &encoder_helper_funcs);
+
+        renc->hdmi = hdmienc;
+        hdmienc->renc = renc;
+
+        return 0;
+
+error:
+        put_device(hdmienc->dev);
+        return ret;
+}
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_hdmienc.h b/drivers/gpu/drm/rcar-du/rcar_du_hdmienc.h
new file mode 100644
index 000000000000..2ff0128ac8e1
--- /dev/null
+++ b/drivers/gpu/drm/rcar-du/rcar_du_hdmienc.h
@@ -0,0 +1,35 @@
+/*
+ * R-Car Display Unit HDMI Encoder
+ *
+ * Copyright (C) 2014 Renesas Electronics Corporation
+ *
+ * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef __RCAR_DU_HDMIENC_H__
+#define __RCAR_DU_HDMIENC_H__
+
+#include <linux/module.h>
+
+struct device_node;
+struct rcar_du_device;
+struct rcar_du_encoder;
+
+#if IS_ENABLED(CONFIG_DRM_RCAR_HDMI)
+int rcar_du_hdmienc_init(struct rcar_du_device *rcdu,
+                         struct rcar_du_encoder *renc, struct device_node *np);
+#else
+static inline int rcar_du_hdmienc_init(struct rcar_du_device *rcdu,
+                                       struct rcar_du_encoder *renc,
+                                       struct device_node *np)
+{
+        return -ENOSYS;
+}
+#endif
+
+#endif /* __RCAR_DU_HDMIENC_H__ */
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms.c b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
index 543fa8bde616..0c5ee616b5a3 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_kms.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
@@ -199,6 +199,7 @@ static int rcar_du_encoders_init_one(struct rcar_du_device *rcdu,
                 enum rcar_du_encoder_type type;
         } encoders[] = {
                 { "adi,adv7123", RCAR_DU_ENCODER_VGA },
+                { "adi,adv7511w", RCAR_DU_ENCODER_HDMI },
                 { "thine,thc63lvdm83d", RCAR_DU_ENCODER_LVDS },
         };