150 lines
3.1 KiB
C
150 lines
3.1 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/media-bus-format.h>
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#include <linux/of_graph.h>
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#include <drm/drm_bridge.h>
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#include <drm/drm_encoder.h>
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#include <drm/drm_of.h>
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#include <drm/drm_simple_kms_helper.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 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_simple_encoder_init(dev, &output->encoder,
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DRM_MODE_ENCODER_NONE);
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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_typed(panel,
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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, 0);
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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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