drm/tilcdc: add encoder slave (v2)

Add output panel driver for i2c encoder slaves.

v1: original
v2: add DT bindings docs, and minor updates for review comments

Signed-off-by: Rob Clark <robdclark@gmail.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Tested-by: Koen Kooi <koen@dominion.thruhere.net>

4 files changed, 407 insertions, 1 deletions

diff --git a/drivers/gpu/drm/tilcdc/Makefile b/drivers/gpu/drm/tilcdc/Makefile
index 1359cc29cd81..aa9097edbaf8 100644
--- a/drivers/gpu/drm/tilcdc/Makefile
+++ b/drivers/gpu/drm/tilcdc/Makefile
@@ -3,6 +3,7 @@ ccflags-y := -Iinclude/drm -Werror
 tilcdc-y := \
         tilcdc_crtc.o \
         tilcdc_tfp410.o \
+        tilcdc_slave.o \
         tilcdc_drv.o
 
 obj-$(CONFIG_DRM_TILCDC)        += tilcdc.o
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_drv.c b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
index f6defbfaaffb..25f3add2a754 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_drv.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
@@ -20,6 +20,7 @@
 #include "tilcdc_drv.h"
 #include "tilcdc_regs.h"
 #include "tilcdc_tfp410.h"
+#include "tilcdc_slave.h"
 
 #include "drm_fb_helper.h"
 
@@ -587,6 +588,7 @@ static int __init tilcdc_drm_init(void)
 {
         DBG("init");
         tilcdc_tfp410_init();
+        tilcdc_slave_init();
         return platform_driver_register(&tilcdc_platform_driver);
 }
 
@@ -594,10 +596,11 @@ static void __exit tilcdc_drm_fini(void)
 {
         DBG("fini");
         tilcdc_tfp410_fini();
+        tilcdc_slave_fini();
         platform_driver_unregister(&tilcdc_platform_driver);
 }
 
-module_init(tilcdc_drm_init);
+late_initcall(tilcdc_drm_init);
 module_exit(tilcdc_drm_fini);
 
 MODULE_AUTHOR("Rob Clark <robdclark@gmail.com");
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_slave.c b/drivers/gpu/drm/tilcdc/tilcdc_slave.c
new file mode 100644
index 000000000000..568dc1c08e6c
--- /dev/null
+++ b/drivers/gpu/drm/tilcdc/tilcdc_slave.c
@@ -0,0 +1,376 @@
+/*
+ * Copyright (C) 2012 Texas Instruments
+ * Author: Rob Clark <robdclark@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/i2c.h>
+#include <linux/of_i2c.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/consumer.h>
+#include <drm/drm_encoder_slave.h>
+
+#include "tilcdc_drv.h"
+
+struct slave_module {
+        struct tilcdc_module base;
+        struct i2c_adapter *i2c;
+};
+#define to_slave_module(x) container_of(x, struct slave_module, base)
+
+static const struct tilcdc_panel_info slave_info = {
+                .bpp                    = 16,
+                .ac_bias                = 255,
+                .ac_bias_intrpt         = 0,
+                .dma_burst_sz           = 16,
+                .fdd                    = 0x80,
+                .tft_alt_mode           = 0,
+                .sync_edge              = 0,
+                .sync_ctrl              = 1,
+                .raster_order           = 0,
+};
+
+
+/*
+ * Encoder:
+ */
+
+struct slave_encoder {
+        struct drm_encoder_slave base;
+        struct slave_module *mod;
+};
+#define to_slave_encoder(x) container_of(to_encoder_slave(x), struct slave_encoder, base)
+
+static inline struct drm_encoder_slave_funcs *
+get_slave_funcs(struct drm_encoder *enc)
+{
+        return to_encoder_slave(enc)->slave_funcs;
+}
+
+static void slave_encoder_destroy(struct drm_encoder *encoder)
+{
+        struct slave_encoder *slave_encoder = to_slave_encoder(encoder);
+        if (get_slave_funcs(encoder))
+                get_slave_funcs(encoder)->destroy(encoder);
+        drm_encoder_cleanup(encoder);
+        kfree(slave_encoder);
+}
+
+static void slave_encoder_prepare(struct drm_encoder *encoder)
+{
+        drm_i2c_encoder_prepare(encoder);
+        tilcdc_crtc_set_panel_info(encoder->crtc, &slave_info);
+}
+
+static const struct drm_encoder_funcs slave_encoder_funcs = {
+                .destroy        = slave_encoder_destroy,
+};
+
+static const struct drm_encoder_helper_funcs slave_encoder_helper_funcs = {
+                .dpms           = drm_i2c_encoder_dpms,
+                .mode_fixup     = drm_i2c_encoder_mode_fixup,
+                .prepare        = slave_encoder_prepare,
+                .commit         = drm_i2c_encoder_commit,
+                .mode_set       = drm_i2c_encoder_mode_set,
+                .save           = drm_i2c_encoder_save,
+                .restore        = drm_i2c_encoder_restore,
+};
+
+static const struct i2c_board_info info = {
+                I2C_BOARD_INFO("tda998x", 0x70)
+};
+
+static struct drm_encoder *slave_encoder_create(struct drm_device *dev,
+                struct slave_module *mod)
+{
+        struct slave_encoder *slave_encoder;
+        struct drm_encoder *encoder;
+        int ret;
+
+        slave_encoder = kzalloc(sizeof(*slave_encoder), GFP_KERNEL);
+        if (!slave_encoder) {
+                dev_err(dev->dev, "allocation failed\n");
+                return NULL;
+        }
+
+        slave_encoder->mod = mod;
+
+        encoder = &slave_encoder->base.base;
+        encoder->possible_crtcs = 1;
+
+        ret = drm_encoder_init(dev, encoder, &slave_encoder_funcs,
+                        DRM_MODE_ENCODER_TMDS);
+        if (ret)
+                goto fail;
+
+        drm_encoder_helper_add(encoder, &slave_encoder_helper_funcs);
+
+        ret = drm_i2c_encoder_init(dev, to_encoder_slave(encoder), mod->i2c, &info);
+        if (ret)
+                goto fail;
+
+        return encoder;
+
+fail:
+        slave_encoder_destroy(encoder);
+        return NULL;
+}
+
+/*
+ * Connector:
+ */
+
+struct slave_connector {
+        struct drm_connector base;
+
+        struct drm_encoder *encoder;  /* our connected encoder */
+        struct slave_module *mod;
+};
+#define to_slave_connector(x) container_of(x, struct slave_connector, base)
+
+static void slave_connector_destroy(struct drm_connector *connector)
+{
+        struct slave_connector *slave_connector = to_slave_connector(connector);
+        drm_connector_cleanup(connector);
+        kfree(slave_connector);
+}
+
+static enum drm_connector_status slave_connector_detect(
+                struct drm_connector *connector,
+                bool force)
+{
+        struct drm_encoder *encoder = to_slave_connector(connector)->encoder;
+        return get_slave_funcs(encoder)->detect(encoder, connector);
+}
+
+static int slave_connector_get_modes(struct drm_connector *connector)
+{
+        struct drm_encoder *encoder = to_slave_connector(connector)->encoder;
+        return get_slave_funcs(encoder)->get_modes(encoder, connector);
+}
+
+static int slave_connector_mode_valid(struct drm_connector *connector,
+                  struct drm_display_mode *mode)
+{
+        struct drm_encoder *encoder = to_slave_connector(connector)->encoder;
+        struct tilcdc_drm_private *priv = connector->dev->dev_private;
+        int ret;
+
+        ret = tilcdc_crtc_mode_valid(priv->crtc, mode);
+        if (ret != MODE_OK)
+                return ret;
+
+        return get_slave_funcs(encoder)->mode_valid(encoder, mode);
+}
+
+static struct drm_encoder *slave_connector_best_encoder(
+                struct drm_connector *connector)
+{
+        struct slave_connector *slave_connector = to_slave_connector(connector);
+        return slave_connector->encoder;
+}
+
+static int slave_connector_set_property(struct drm_connector *connector,
+                struct drm_property *property, uint64_t value)
+{
+        struct drm_encoder *encoder = to_slave_connector(connector)->encoder;
+        return get_slave_funcs(encoder)->set_property(encoder,
+                        connector, property, value);
+}
+
+static const struct drm_connector_funcs slave_connector_funcs = {
+        .destroy            = slave_connector_destroy,
+        .dpms               = drm_helper_connector_dpms,
+        .detect             = slave_connector_detect,
+        .fill_modes         = drm_helper_probe_single_connector_modes,
+        .set_property       = slave_connector_set_property,
+};
+
+static const struct drm_connector_helper_funcs slave_connector_helper_funcs = {
+        .get_modes          = slave_connector_get_modes,
+        .mode_valid         = slave_connector_mode_valid,
+        .best_encoder       = slave_connector_best_encoder,
+};
+
+static struct drm_connector *slave_connector_create(struct drm_device *dev,
+                struct slave_module *mod, struct drm_encoder *encoder)
+{
+        struct slave_connector *slave_connector;
+        struct drm_connector *connector;
+        int ret;
+
+        slave_connector = kzalloc(sizeof(*slave_connector), GFP_KERNEL);
+        if (!slave_connector) {
+                dev_err(dev->dev, "allocation failed\n");
+                return NULL;
+        }
+
+        slave_connector->encoder = encoder;
+        slave_connector->mod = mod;
+
+        connector = &slave_connector->base;
+
+        drm_connector_init(dev, connector, &slave_connector_funcs,
+                        DRM_MODE_CONNECTOR_HDMIA);
+        drm_connector_helper_add(connector, &slave_connector_helper_funcs);
+
+        connector->polled = DRM_CONNECTOR_POLL_CONNECT |
+                        DRM_CONNECTOR_POLL_DISCONNECT;
+
+        connector->interlace_allowed = 0;
+        connector->doublescan_allowed = 0;
+
+        get_slave_funcs(encoder)->create_resources(encoder, connector);
+
+        ret = drm_mode_connector_attach_encoder(connector, encoder);
+        if (ret)
+                goto fail;
+
+        drm_sysfs_connector_add(connector);
+
+        return connector;
+
+fail:
+        slave_connector_destroy(connector);
+        return NULL;
+}
+
+/*
+ * Module:
+ */
+
+static int slave_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
+{
+        struct slave_module *slave_mod = to_slave_module(mod);
+        struct tilcdc_drm_private *priv = dev->dev_private;
+        struct drm_encoder *encoder;
+        struct drm_connector *connector;
+
+        encoder = slave_encoder_create(dev, slave_mod);
+        if (!encoder)
+                return -ENOMEM;
+
+        connector = slave_connector_create(dev, slave_mod, encoder);
+        if (!connector)
+                return -ENOMEM;
+
+        priv->encoders[priv->num_encoders++] = encoder;
+        priv->connectors[priv->num_connectors++] = connector;
+
+        return 0;
+}
+
+static void slave_destroy(struct tilcdc_module *mod)
+{
+        struct slave_module *slave_mod = to_slave_module(mod);
+
+        tilcdc_module_cleanup(mod);
+        kfree(slave_mod);
+}
+
+static const struct tilcdc_module_ops slave_module_ops = {
+                .modeset_init = slave_modeset_init,
+                .destroy = slave_destroy,
+};
+
+/*
+ * Device:
+ */
+
+static struct of_device_id slave_of_match[];
+
+static int slave_probe(struct platform_device *pdev)
+{
+        struct device_node *node = pdev->dev.of_node;
+        struct device_node *i2c_node;
+        struct slave_module *slave_mod;
+        struct tilcdc_module *mod;
+        struct pinctrl *pinctrl;
+        uint32_t i2c_phandle;
+        int ret = -EINVAL;
+
+        /* bail out early if no DT data: */
+        if (!node) {
+                dev_err(&pdev->dev, "device-tree data is missing\n");
+                return -ENXIO;
+        }
+
+        slave_mod = kzalloc(sizeof(*slave_mod), GFP_KERNEL);
+        if (!slave_mod)
+                return -ENOMEM;
+
+        mod = &slave_mod->base;
+
+        tilcdc_module_init(mod, "slave", &slave_module_ops);
+
+        pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
+        if (IS_ERR(pinctrl))
+                dev_warn(&pdev->dev, "pins are not configured\n");
+
+        if (of_property_read_u32(node, "i2c", &i2c_phandle)) {
+                dev_err(&pdev->dev, "could not get i2c bus phandle\n");
+                goto fail;
+        }
+
+        i2c_node = of_find_node_by_phandle(i2c_phandle);
+        if (!i2c_node) {
+                dev_err(&pdev->dev, "could not get i2c bus node\n");
+                goto fail;
+        }
+
+        slave_mod->i2c = of_find_i2c_adapter_by_node(i2c_node);
+        if (!slave_mod->i2c) {
+                dev_err(&pdev->dev, "could not get i2c\n");
+                goto fail;
+        }
+
+        of_node_put(i2c_node);
+
+        return 0;
+
+fail:
+        slave_destroy(mod);
+        return ret;
+}
+
+static int slave_remove(struct platform_device *pdev)
+{
+        return 0;
+}
+
+static struct of_device_id slave_of_match[] = {
+                { .compatible = "ti,tilcdc,slave", },
+                { },
+};
+MODULE_DEVICE_TABLE(of, slave_of_match);
+
+struct platform_driver slave_driver = {
+        .probe = slave_probe,
+        .remove = slave_remove,
+        .driver = {
+                .owner = THIS_MODULE,
+                .name = "slave",
+                .of_match_table = slave_of_match,
+        },
+};
+
+int __init tilcdc_slave_init(void)
+{
+        return platform_driver_register(&slave_driver);
+}
+
+void __exit tilcdc_slave_fini(void)
+{
+        platform_driver_unregister(&slave_driver);
+}
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_slave.h b/drivers/gpu/drm/tilcdc/tilcdc_slave.h
new file mode 100644
index 000000000000..2f8504848320
--- /dev/null
+++ b/drivers/gpu/drm/tilcdc/tilcdc_slave.h
@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) 2012 Texas Instruments
+ * Author: Rob Clark <robdclark@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __TILCDC_SLAVE_H__
+#define __TILCDC_SLAVE_H__
+
+/* sub-module for i2c slave encoder output */
+
+int tilcdc_slave_init(void);
+void tilcdc_slave_fini(void);
+
+#endif /* __TILCDC_SLAVE_H__ */