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a1018063f7
Get rid of drm_of_find_panel_or_bridge() as it is deprecated and use devm_drm_of_get_bridge() instead. Signed-off-by: Ludovic Desroches <ludovic.desroches@microchip.com> Reviewed-by: Manikandan Muralidharan <manikandan.m@microchip.com> Link: https://patch.msgid.link/20251218-lcd_cleanup_mainline-v2-5-df837aba878f@microchip.com Signed-off-by: Manikandan Muralidharan <manikandan.m@microchip.com>
130 lines
2.9 KiB
C
130 lines
2.9 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.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_print.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_bridge *bridge;
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struct atmel_hlcdc_dc *dc = dev->dev_private;
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struct drm_crtc *crtc = dc->crtc;
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int ret = 0;
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bridge = devm_drm_of_get_bridge(dev->dev, dev->dev->of_node, 0, endpoint);
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if (IS_ERR(bridge))
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return PTR_ERR(bridge);
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output = drmm_simple_encoder_alloc(dev, struct atmel_hlcdc_rgb_output,
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encoder, DRM_MODE_ENCODER_NONE);
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if (IS_ERR(output))
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return PTR_ERR(output);
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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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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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drm_err(dev, "endpoint %d: invalid bus width\n", endpoint);
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return -EINVAL;
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}
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output->encoder.possible_crtcs = drm_crtc_mask(crtc);
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if (bridge)
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ret = drm_bridge_attach(&output->encoder, bridge, NULL, 0);
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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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