ping.
On Wed, Jun 11, 2014 at 11:57 PM, Ajay Kumar <ajaykumar...@samsung.com> wrote:
> Add a dummy bridge which binds all of the drm_bridge callbacks
> to corresponding drm_panel callbacks.
>
> In theory, this is just a glue layer for the last bridge and
> the panel attached to it.
>
> This driver also implements the required drm_connector ops
> for the encoder(on which the entire bridge chain is hanging off).
>
> Signed-off-by: Ajay Kumar <ajaykumar...@samsung.com>
> ---
> drivers/gpu/drm/bridge/Kconfig | 7 ++
> drivers/gpu/drm/bridge/Makefile | 1 +
> drivers/gpu/drm/bridge/panel_binder.c | 193
> +++++++++++++++++++++++++++++++++
> include/drm/bridge/panel_binder.h | 44 ++++++++
> 4 files changed, 245 insertions(+)
> create mode 100644 drivers/gpu/drm/bridge/panel_binder.c
> create mode 100644 include/drm/bridge/panel_binder.h
>
> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> index 884923f..e3fb487 100644
> --- a/drivers/gpu/drm/bridge/Kconfig
> +++ b/drivers/gpu/drm/bridge/Kconfig
> @@ -3,3 +3,10 @@ config DRM_PTN3460
> depends on DRM
> select DRM_KMS_HELPER
> ---help---
> +
> +config DRM_PANEL_BINDER
> + tristate "bridge panel binder"
> + depends on DRM
> + select DRM_KMS_HELPER
> + select DRM_PANEL
> + ---help---
> diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
> index b4733e1..ba8b5b8 100644
> --- a/drivers/gpu/drm/bridge/Makefile
> +++ b/drivers/gpu/drm/bridge/Makefile
> @@ -1,3 +1,4 @@
> ccflags-y := -Iinclude/drm
>
> obj-$(CONFIG_DRM_PTN3460) += ptn3460.o
> +obj-$(CONFIG_DRM_PANEL_BINDER) += panel_binder.o
> diff --git a/drivers/gpu/drm/bridge/panel_binder.c
> b/drivers/gpu/drm/bridge/panel_binder.c
> new file mode 100644
> index 0000000..93d976b
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/panel_binder.c
> @@ -0,0 +1,193 @@
> +/*
> + * Copyright (C) 2014 Samsung Electronics Co., Ltd.
> + *
> + * This software is licensed under the terms of the GNU General Public
> + * License version 2, as published by the Free Software Foundation, and
> + * may be copied, distributed, and modified under those terms.
> + *
> + * 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.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/of.h>
> +
> +#include <drm/drm_panel.h>
> +
> +#include "drmP.h"
> +#include "drm_crtc.h"
> +#include "drm_crtc_helper.h"
> +
> +#include "bridge/panel_binder.h"
> +
> +struct panel_binder {
> + struct drm_connector connector;
> + struct i2c_client *client;
> + struct drm_encoder *encoder;
> + struct drm_bridge *bridge;
> + struct drm_panel *panel;
> +};
> +
> +static void panel_binder_pre_enable(struct drm_bridge *bridge)
> +{
> + struct panel_binder *panel_binder = bridge->driver_private;
> +
> + drm_panel_prepare(panel_binder->panel);
> +}
> +
> +static void panel_binder_enable(struct drm_bridge *bridge)
> +{
> + struct panel_binder *panel_binder = bridge->driver_private;
> +
> + drm_panel_enable(panel_binder->panel);
> +}
> +
> +static void panel_binder_disable(struct drm_bridge *bridge)
> +{
> + struct panel_binder *panel_binder = bridge->driver_private;
> +
> + drm_panel_disable(panel_binder->panel);
> +}
> +
> +static void panel_binder_post_disable(struct drm_bridge *bridge)
> +{
> + struct panel_binder *panel_binder = bridge->driver_private;
> +
> + drm_panel_unprepare(panel_binder->panel);
> +}
> +
> +void panel_binder_destroy(struct drm_bridge *bridge)
> +{
> + struct panel_binder *panel_binder = bridge->driver_private;
> +
> + drm_panel_detach(panel_binder->panel);
> + drm_bridge_cleanup(bridge);
> +}
> +
> +struct drm_bridge_funcs panel_binder_funcs = {
> + .pre_enable = panel_binder_pre_enable,
> + .enable = panel_binder_enable,
> + .disable = panel_binder_disable,
> + .post_disable = panel_binder_post_disable,
> + .destroy = panel_binder_destroy,
> +};
> +
> +static int panel_binder_mode_valid(struct drm_connector *connector,
> + struct drm_display_mode *mode)
> +{
> + return MODE_OK;
> +}
> +
> +static int panel_binder_get_modes(struct drm_connector *connector)
> +{
> + struct panel_binder *panel_binder;
> +
> + panel_binder = container_of(connector, struct panel_binder,
> connector);
> +
> + return panel_binder->panel->funcs->get_modes(panel_binder->panel);
> +}
> +
> +static struct drm_encoder *panel_binder_best_encoder(struct drm_connector
> + *connector)
> +{
> + struct panel_binder *panel_binder;
> +
> + panel_binder = container_of(connector, struct panel_binder,
> connector);
> +
> + return panel_binder->encoder;
> +}
> +
> +static const struct drm_connector_helper_funcs
> + panel_binder_connector_helper_funcs =
> {
> + .get_modes = panel_binder_get_modes,
> + .mode_valid = panel_binder_mode_valid,
> + .best_encoder = panel_binder_best_encoder,
> +};
> +
> +static enum drm_connector_status panel_binder_detect(struct drm_connector
> + *connector, bool
> force)
> +{
> + return connector_status_connected;
> +}
> +
> +static void panel_binder_connector_destroy(struct drm_connector *connector)
> +{
> + drm_connector_cleanup(connector);
> +}
> +
> +static const struct drm_connector_funcs panel_binder_connector_funcs = {
> + .dpms = drm_helper_connector_dpms,
> + .fill_modes = drm_helper_probe_single_connector_modes,
> + .detect = panel_binder_detect,
> + .destroy = panel_binder_connector_destroy,
> +};
> +
> +struct drm_bridge *panel_binder_init(struct drm_device *dev,
> + struct drm_encoder *encoder,
> + struct i2c_client *client,
> + struct device_node *node,
> + struct drm_panel *panel,
> + int connector_type,
> + uint8_t polled)
> +{
> + int ret;
> + struct drm_bridge *bridge;
> + struct panel_binder *panel_binder;
> +
> + if (IS_ERR_OR_NULL(panel)) {
> + DRM_ERROR("invalid drm_panel pointer\n");
> + return NULL;
> + }
> +
> + bridge = devm_kzalloc(dev->dev, sizeof(*bridge), GFP_KERNEL);
> + if (!bridge) {
> + DRM_ERROR("failed to allocate drm bridge\n");
> + return NULL;
> + }
> +
> + panel_binder = devm_kzalloc(dev->dev, sizeof(*panel_binder),
> + GFP_KERNEL);
> + if (!panel_binder) {
> + DRM_ERROR("failed to allocate bridge panel_binder\n");
> + return NULL;
> + }
> +
> + panel_binder->client = client;
> + panel_binder->encoder = encoder;
> + panel_binder->bridge = bridge;
> + panel_binder->panel = panel;
> +
> + ret = drm_bridge_init(dev, bridge, &panel_binder_funcs);
> + if (ret) {
> + DRM_ERROR("failed to initialize bridge with drm\n");
> + goto err;
> + }
> +
> + bridge->driver_private = panel_binder;
> +
> + drm_panel_attach(panel_binder->panel, &panel_binder->connector);
> +
> + if (!encoder->bridge)
> + /* First entry in the bridge chain */
> + encoder->bridge = bridge;
> +
> + panel_binder->connector.polled = polled;
> + ret = drm_connector_init(dev, &panel_binder->connector,
> + &panel_binder_connector_funcs, connector_type);
> + if (ret) {
> + DRM_ERROR("failed to initialize connector with drm\n");
> + goto err;
> + }
> + drm_connector_helper_add(&panel_binder->connector,
> + &panel_binder_connector_helper_funcs);
> + drm_sysfs_connector_add(&panel_binder->connector);
> + drm_mode_connector_attach_encoder(&panel_binder->connector, encoder);
> +
> + return bridge;
> +
> +err:
> + return NULL;
> +}
> +EXPORT_SYMBOL(panel_binder_init);
> diff --git a/include/drm/bridge/panel_binder.h
> b/include/drm/bridge/panel_binder.h
> new file mode 100644
> index 0000000..b5ebbc2
> --- /dev/null
> +++ b/include/drm/bridge/panel_binder.h
> @@ -0,0 +1,44 @@
> +/*
> + * Copyright (C) 2014 Samsung Electronics Co., Ltd.
> + *
> + * This software is licensed under the terms of the GNU General Public
> + * License version 2, as published by the Free Software Foundation, and
> + * may be copied, distributed, and modified under those terms.
> + *
> + * 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.
> + */
> +
> +#ifndef _DRM_BRIDGE_PANEL_H_
> +#define _DRM_BRIDGE_PANEL_H_
> +
> +struct drm_device;
> +struct drm_encoder;
> +struct i2c_client;
> +struct device_node;
> +struct drm_panel;
> +
> +#if defined(CONFIG_DRM_PANEL_BINDER)
> +struct drm_bridge *panel_binder_init(struct drm_device *dev,
> + struct drm_encoder *encoder,
> + struct i2c_client *client,
> + struct device_node *node,
> + struct drm_panel *panel,
> + int connector_type,
> + uint8_t polled);
> +#else
> +static inline struct drm_bridge *panel_binder_init(struct drm_device *dev,
> + struct drm_encoder *encoder,
> + struct i2c_client *client,
> + struct device_node *node,
> + struct drm_panel *panel,
> + int connector_type,
> + uint8_t polled)
> +{
> + return 0;
> +}
> +#endif
> +
> +#endif
> --
> 1.7.9.5
>
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