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012877b76c
This enables more flexible devicetrees. You can e.g. have two output nodes where one is not enabled, without the ordering affecting things. Prior to this patch the active nodes had to have endpoint id zero and upwards consecutively. Signed-off-by: Peter Rosin <peda@axentia.se> Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180825085620.10566-4-peda@axentia.se
101 lines
2.4 KiB
C
101 lines
2.4 KiB
C
/*
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* Copyright (C) 2014 Traphandler
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* Copyright (C) 2014 Free Electrons
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* Copyright (C) 2014 Atmel
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*
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* Author: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
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* Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/of_graph.h>
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#include <drm/drmP.h>
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#include <drm/drm_of.h>
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#include <drm/drm_bridge.h>
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#include "atmel_hlcdc_dc.h"
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static const struct drm_encoder_funcs atmel_hlcdc_panel_encoder_funcs = {
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.destroy = drm_encoder_cleanup,
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};
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static int atmel_hlcdc_attach_endpoint(struct drm_device *dev, int endpoint)
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{
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struct drm_encoder *encoder;
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struct drm_panel *panel;
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struct drm_bridge *bridge;
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int ret;
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ret = drm_of_find_panel_or_bridge(dev->dev->of_node, 0, endpoint,
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&panel, &bridge);
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if (ret)
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return ret;
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encoder = devm_kzalloc(dev->dev, sizeof(*encoder), GFP_KERNEL);
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if (!encoder)
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return -EINVAL;
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ret = drm_encoder_init(dev, encoder,
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&atmel_hlcdc_panel_encoder_funcs,
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DRM_MODE_ENCODER_NONE, NULL);
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if (ret)
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return ret;
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encoder->possible_crtcs = 0x1;
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if (panel) {
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bridge = drm_panel_bridge_add(panel, DRM_MODE_CONNECTOR_Unknown);
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if (IS_ERR(bridge))
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return PTR_ERR(bridge);
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}
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if (bridge) {
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ret = drm_bridge_attach(encoder, bridge, NULL);
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if (!ret)
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return 0;
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if (panel)
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drm_panel_bridge_remove(bridge);
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}
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drm_encoder_cleanup(encoder);
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return ret;
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}
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int atmel_hlcdc_create_outputs(struct drm_device *dev)
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{
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int endpoint, ret = 0;
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int attached = 0;
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/*
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* Always scan the first few endpoints even if we get -ENODEV,
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* but keep going after that as long as we keep getting hits.
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*/
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for (endpoint = 0; !ret || endpoint < 4; endpoint++) {
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ret = atmel_hlcdc_attach_endpoint(dev, endpoint);
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if (ret == -ENODEV)
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continue;
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if (ret)
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break;
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attached++;
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}
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/* At least one device was successfully attached.*/
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if (ret == -ENODEV && attached)
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return 0;
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return ret;
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}
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