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Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 503 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Enrico Weigelt <info@metux.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190602204653.811534538@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
152 lines
3.2 KiB
C
152 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#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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struct atmel_hlcdc_rgb_output {
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struct drm_encoder encoder;
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int bus_fmt;
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};
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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 struct atmel_hlcdc_rgb_output *
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atmel_hlcdc_encoder_to_rgb_output(struct drm_encoder *encoder)
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{
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return container_of(encoder, struct atmel_hlcdc_rgb_output, encoder);
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}
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int atmel_hlcdc_encoder_get_bus_fmt(struct drm_encoder *encoder)
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{
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struct atmel_hlcdc_rgb_output *output;
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output = atmel_hlcdc_encoder_to_rgb_output(encoder);
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return output->bus_fmt;
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}
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static int atmel_hlcdc_of_bus_fmt(const struct device_node *ep)
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{
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u32 bus_width;
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int ret;
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ret = of_property_read_u32(ep, "bus-width", &bus_width);
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if (ret == -EINVAL)
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return 0;
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if (ret)
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return ret;
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switch (bus_width) {
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case 12:
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return MEDIA_BUS_FMT_RGB444_1X12;
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case 16:
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return MEDIA_BUS_FMT_RGB565_1X16;
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case 18:
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return MEDIA_BUS_FMT_RGB666_1X18;
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case 24:
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return MEDIA_BUS_FMT_RGB888_1X24;
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default:
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return -EINVAL;
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}
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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 atmel_hlcdc_rgb_output *output;
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struct device_node *ep;
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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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ep = of_graph_get_endpoint_by_regs(dev->dev->of_node, 0, endpoint);
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if (!ep)
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return -ENODEV;
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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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of_node_put(ep);
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return ret;
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}
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output = devm_kzalloc(dev->dev, sizeof(*output), GFP_KERNEL);
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if (!output) {
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of_node_put(ep);
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return -ENOMEM;
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}
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output->bus_fmt = atmel_hlcdc_of_bus_fmt(ep);
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of_node_put(ep);
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if (output->bus_fmt < 0) {
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dev_err(dev->dev, "endpoint %d: invalid bus width\n", endpoint);
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return -EINVAL;
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}
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ret = drm_encoder_init(dev, &output->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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output->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(&output->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(&output->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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