cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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rockchip_rgb.c (4600B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
      4 * Author:
      5 *      Sandy Huang <hjc@rock-chips.com>
      6 */
      7
      8#include <linux/component.h>
      9#include <linux/of_graph.h>
     10
     11#include <drm/display/drm_dp_helper.h>
     12#include <drm/drm_atomic_helper.h>
     13#include <drm/drm_bridge.h>
     14#include <drm/drm_bridge_connector.h>
     15#include <drm/drm_of.h>
     16#include <drm/drm_panel.h>
     17#include <drm/drm_probe_helper.h>
     18#include <drm/drm_simple_kms_helper.h>
     19
     20#include "rockchip_drm_drv.h"
     21#include "rockchip_drm_vop.h"
     22#include "rockchip_rgb.h"
     23
     24#define encoder_to_rgb(c) container_of(c, struct rockchip_rgb, encoder)
     25
     26struct rockchip_rgb {
     27	struct device *dev;
     28	struct drm_device *drm_dev;
     29	struct drm_bridge *bridge;
     30	struct drm_encoder encoder;
     31	struct drm_connector connector;
     32	int output_mode;
     33};
     34
     35static int
     36rockchip_rgb_encoder_atomic_check(struct drm_encoder *encoder,
     37				   struct drm_crtc_state *crtc_state,
     38				   struct drm_connector_state *conn_state)
     39{
     40	struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
     41	struct drm_connector *connector = conn_state->connector;
     42	struct drm_display_info *info = &connector->display_info;
     43	u32 bus_format;
     44
     45	if (info->num_bus_formats)
     46		bus_format = info->bus_formats[0];
     47	else
     48		bus_format = MEDIA_BUS_FMT_RGB888_1X24;
     49
     50	switch (bus_format) {
     51	case MEDIA_BUS_FMT_RGB666_1X18:
     52		s->output_mode = ROCKCHIP_OUT_MODE_P666;
     53		break;
     54	case MEDIA_BUS_FMT_RGB565_1X16:
     55		s->output_mode = ROCKCHIP_OUT_MODE_P565;
     56		break;
     57	case MEDIA_BUS_FMT_RGB888_1X24:
     58	case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
     59	default:
     60		s->output_mode = ROCKCHIP_OUT_MODE_P888;
     61		break;
     62	}
     63
     64	s->output_type = DRM_MODE_CONNECTOR_LVDS;
     65
     66	return 0;
     67}
     68
     69static const
     70struct drm_encoder_helper_funcs rockchip_rgb_encoder_helper_funcs = {
     71	.atomic_check = rockchip_rgb_encoder_atomic_check,
     72};
     73
     74struct rockchip_rgb *rockchip_rgb_init(struct device *dev,
     75				       struct drm_crtc *crtc,
     76				       struct drm_device *drm_dev)
     77{
     78	struct rockchip_rgb *rgb;
     79	struct drm_encoder *encoder;
     80	struct device_node *port, *endpoint;
     81	u32 endpoint_id;
     82	int ret = 0, child_count = 0;
     83	struct drm_panel *panel;
     84	struct drm_bridge *bridge;
     85	struct drm_connector *connector;
     86
     87	rgb = devm_kzalloc(dev, sizeof(*rgb), GFP_KERNEL);
     88	if (!rgb)
     89		return ERR_PTR(-ENOMEM);
     90
     91	rgb->dev = dev;
     92	rgb->drm_dev = drm_dev;
     93
     94	port = of_graph_get_port_by_id(dev->of_node, 0);
     95	if (!port)
     96		return ERR_PTR(-EINVAL);
     97
     98	for_each_child_of_node(port, endpoint) {
     99		if (of_property_read_u32(endpoint, "reg", &endpoint_id))
    100			endpoint_id = 0;
    101
    102		/* if subdriver (> 0) or error case (< 0), ignore entry */
    103		if (rockchip_drm_endpoint_is_subdriver(endpoint) != 0)
    104			continue;
    105
    106		child_count++;
    107		ret = drm_of_find_panel_or_bridge(dev->of_node, 0, endpoint_id,
    108						  &panel, &bridge);
    109		if (!ret) {
    110			of_node_put(endpoint);
    111			break;
    112		}
    113	}
    114
    115	of_node_put(port);
    116
    117	/* if the rgb output is not connected to anything, just return */
    118	if (!child_count)
    119		return NULL;
    120
    121	if (ret < 0) {
    122		if (ret != -EPROBE_DEFER)
    123			DRM_DEV_ERROR(dev, "failed to find panel or bridge %d\n", ret);
    124		return ERR_PTR(ret);
    125	}
    126
    127	encoder = &rgb->encoder;
    128	encoder->possible_crtcs = drm_crtc_mask(crtc);
    129
    130	ret = drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_NONE);
    131	if (ret < 0) {
    132		DRM_DEV_ERROR(drm_dev->dev,
    133			      "failed to initialize encoder: %d\n", ret);
    134		return ERR_PTR(ret);
    135	}
    136
    137	drm_encoder_helper_add(encoder, &rockchip_rgb_encoder_helper_funcs);
    138
    139	if (panel) {
    140		bridge = drm_panel_bridge_add_typed(panel,
    141						    DRM_MODE_CONNECTOR_LVDS);
    142		if (IS_ERR(bridge))
    143			return ERR_CAST(bridge);
    144	}
    145
    146	rgb->bridge = bridge;
    147
    148	ret = drm_bridge_attach(encoder, rgb->bridge, NULL,
    149				DRM_BRIDGE_ATTACH_NO_CONNECTOR);
    150	if (ret)
    151		goto err_free_encoder;
    152
    153	connector = &rgb->connector;
    154	connector = drm_bridge_connector_init(rgb->drm_dev, encoder);
    155	if (IS_ERR(connector)) {
    156		DRM_DEV_ERROR(drm_dev->dev,
    157			      "failed to initialize bridge connector: %pe\n",
    158			      connector);
    159		ret = PTR_ERR(connector);
    160		goto err_free_encoder;
    161	}
    162
    163	ret = drm_connector_attach_encoder(connector, encoder);
    164	if (ret < 0) {
    165		DRM_DEV_ERROR(drm_dev->dev,
    166			      "failed to attach encoder: %d\n", ret);
    167		goto err_free_connector;
    168	}
    169
    170	return rgb;
    171
    172err_free_connector:
    173	drm_connector_cleanup(connector);
    174err_free_encoder:
    175	drm_encoder_cleanup(encoder);
    176	return ERR_PTR(ret);
    177}
    178EXPORT_SYMBOL_GPL(rockchip_rgb_init);
    179
    180void rockchip_rgb_fini(struct rockchip_rgb *rgb)
    181{
    182	drm_panel_bridge_remove(rgb->bridge);
    183	drm_connector_cleanup(&rgb->connector);
    184	drm_encoder_cleanup(&rgb->encoder);
    185}
    186EXPORT_SYMBOL_GPL(rockchip_rgb_fini);