diff options
Diffstat (limited to 'drivers/gpu/drm/tve200/tve200_connector.c')
| -rw-r--r-- | drivers/gpu/drm/tve200/tve200_connector.c | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/drivers/gpu/drm/tve200/tve200_connector.c b/drivers/gpu/drm/tve200/tve200_connector.c new file mode 100644 index 000000000000..5e6c20b57d6d --- /dev/null +++ b/drivers/gpu/drm/tve200/tve200_connector.c @@ -0,0 +1,125 @@ +/* + * Copyright (C) 2017 Linus Walleij <linus.walleij@linaro.org> + * Parts of this file were based on sources as follows: + * + * Copyright (C) 2006-2008 Intel Corporation + * Copyright (C) 2007 Amos Lee <amos_lee@storlinksemi.com> + * Copyright (C) 2007 Dave Airlie <airlied@linux.ie> + * Copyright (C) 2011 Texas Instruments + * Copyright (C) 2017 Eric Anholt + * + * This program is free software and is provided to you under the terms of the + * GNU General Public License version 2 as published by the Free Software + * Foundation, and any use by you of this program is subject to the terms of + * such GNU licence. + */ + +/** + * tve200_drm_connector.c + * Implementation of the connector functions for the Faraday TV Encoder + */ +#include <linux/version.h> +#include <linux/shmem_fs.h> +#include <linux/dma-buf.h> + +#include <drm/drmP.h> +#include <drm/drm_atomic_helper.h> +#include <drm/drm_crtc_helper.h> +#include <drm/drm_of.h> +#include <drm/drm_panel.h> + +#include "tve200_drm.h" + +static void tve200_connector_destroy(struct drm_connector *connector) +{ + struct tve200_drm_connector *tve200con = + to_tve200_connector(connector); + + if (tve200con->panel) + drm_panel_detach(tve200con->panel); + + drm_connector_unregister(connector); + drm_connector_cleanup(connector); +} + +static enum drm_connector_status tve200_connector_detect(struct drm_connector + *connector, bool force) +{ + struct tve200_drm_connector *tve200con = + to_tve200_connector(connector); + + return (tve200con->panel ? + connector_status_connected : + connector_status_disconnected); +} + +static int tve200_connector_helper_get_modes(struct drm_connector *connector) +{ + struct tve200_drm_connector *tve200con = + to_tve200_connector(connector); + + if (!tve200con->panel) + return 0; + + return drm_panel_get_modes(tve200con->panel); +} + +static const struct drm_connector_funcs connector_funcs = { + .fill_modes = drm_helper_probe_single_connector_modes, + .destroy = tve200_connector_destroy, + .detect = tve200_connector_detect, + .reset = drm_atomic_helper_connector_reset, + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, +}; + +static const struct drm_connector_helper_funcs connector_helper_funcs = { + .get_modes = tve200_connector_helper_get_modes, +}; + +/* + * Walks the OF graph to find the panel node and then asks DRM to look + * up the panel. + */ +static struct drm_panel *tve200_get_panel(struct device *dev) +{ + struct device_node *endpoint, *panel_node; + struct device_node *np = dev->of_node; + struct drm_panel *panel; + + endpoint = of_graph_get_next_endpoint(np, NULL); + if (!endpoint) { + dev_err(dev, "no endpoint to fetch panel\n"); + return NULL; + } + + /* Don't proceed if we have an endpoint but no panel_node tied to it */ + panel_node = of_graph_get_remote_port_parent(endpoint); + of_node_put(endpoint); + if (!panel_node) { + dev_err(dev, "no valid panel node\n"); + return NULL; + } + + panel = of_drm_find_panel(panel_node); + of_node_put(panel_node); + + return panel; +} + +int tve200_connector_init(struct drm_device *dev) +{ + struct tve200_drm_dev_private *priv = dev->dev_private; + struct tve200_drm_connector *tve200con = &priv->connector; + struct drm_connector *connector = &tve200con->connector; + + drm_connector_init(dev, connector, &connector_funcs, + DRM_MODE_CONNECTOR_DPI); + drm_connector_helper_add(connector, &connector_helper_funcs); + + tve200con->panel = tve200_get_panel(dev->dev); + if (tve200con->panel) + drm_panel_attach(tve200con->panel, connector); + + return 0; +} |