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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rcar_du_encoder.c (3734B)

      1// SPDX-License-Identifier: GPL-2.0+
      2/*
      3 * rcar_du_encoder.c  --  R-Car Display Unit Encoder
      4 *
      5 * Copyright (C) 2013-2014 Renesas Electronics Corporation
      6 *
      7 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
      8 */
      9
     10#include <linux/export.h>
     11#include <linux/slab.h>
     12
     13#include <drm/drm_bridge.h>
     14#include <drm/drm_bridge_connector.h>
     15#include <drm/drm_crtc.h>
     16#include <drm/drm_managed.h>
     17#include <drm/drm_modeset_helper_vtables.h>
     18#include <drm/drm_panel.h>
     19
     20#include "rcar_du_drv.h"
     21#include "rcar_du_encoder.h"
     22#include "rcar_du_kms.h"
     23#include "rcar_lvds.h"
     24
     25/* -----------------------------------------------------------------------------
     26 * Encoder
     27 */
     28
     29static unsigned int rcar_du_encoder_count_ports(struct device_node *node)
     30{
     31	struct device_node *ports;
     32	struct device_node *port;
     33	unsigned int num_ports = 0;
     34
     35	ports = of_get_child_by_name(node, "ports");
     36	if (!ports)
     37		ports = of_node_get(node);
     38
     39	for_each_child_of_node(ports, port) {
     40		if (of_node_name_eq(port, "port"))
     41			num_ports++;
     42	}
     43
     44	of_node_put(ports);
     45
     46	return num_ports;
     47}
     48
     49static const struct drm_encoder_funcs rcar_du_encoder_funcs = {
     50};
     51
     52int rcar_du_encoder_init(struct rcar_du_device *rcdu,
     53			 enum rcar_du_output output,
     54			 struct device_node *enc_node)
     55{
     56	struct rcar_du_encoder *renc;
     57	struct drm_connector *connector;
     58	struct drm_bridge *bridge;
     59	int ret;
     60
     61	/*
     62	 * Locate the DRM bridge from the DT node. For the DPAD outputs, if the
     63	 * DT node has a single port, assume that it describes a panel and
     64	 * create a panel bridge.
     65	 */
     66	if ((output == RCAR_DU_OUTPUT_DPAD0 ||
     67	     output == RCAR_DU_OUTPUT_DPAD1) &&
     68	    rcar_du_encoder_count_ports(enc_node) == 1) {
     69		struct drm_panel *panel = of_drm_find_panel(enc_node);
     70
     71		if (IS_ERR(panel))
     72			return PTR_ERR(panel);
     73
     74		bridge = devm_drm_panel_bridge_add_typed(rcdu->dev, panel,
     75							 DRM_MODE_CONNECTOR_DPI);
     76		if (IS_ERR(bridge))
     77			return PTR_ERR(bridge);
     78	} else {
     79		bridge = of_drm_find_bridge(enc_node);
     80		if (!bridge)
     81			return -EPROBE_DEFER;
     82
     83		if (output == RCAR_DU_OUTPUT_LVDS0 ||
     84		    output == RCAR_DU_OUTPUT_LVDS1)
     85			rcdu->lvds[output - RCAR_DU_OUTPUT_LVDS0] = bridge;
     86	}
     87
     88	/*
     89	 * Create and initialize the encoder. On Gen3, skip the LVDS1 output if
     90	 * the LVDS1 encoder is used as a companion for LVDS0 in dual-link
     91	 * mode, or any LVDS output if it isn't connected. The latter may happen
     92	 * on D3 or E3 as the LVDS encoders are needed to provide the pixel
     93	 * clock to the DU, even when the LVDS outputs are not used.
     94	 */
     95	if (rcdu->info->gen >= 3) {
     96		if (output == RCAR_DU_OUTPUT_LVDS1 &&
     97		    rcar_lvds_dual_link(bridge))
     98			return -ENOLINK;
     99
    100		if ((output == RCAR_DU_OUTPUT_LVDS0 ||
    101		     output == RCAR_DU_OUTPUT_LVDS1) &&
    102		    !rcar_lvds_is_connected(bridge))
    103			return -ENOLINK;
    104	}
    105
    106	dev_dbg(rcdu->dev, "initializing encoder %pOF for output %s\n",
    107		enc_node, rcar_du_output_name(output));
    108
    109	renc = drmm_encoder_alloc(&rcdu->ddev, struct rcar_du_encoder, base,
    110				  &rcar_du_encoder_funcs, DRM_MODE_ENCODER_NONE,
    111				  NULL);
    112	if (!renc)
    113		return -ENOMEM;
    114
    115	renc->output = output;
    116
    117	/* Attach the bridge to the encoder. */
    118	ret = drm_bridge_attach(&renc->base, bridge, NULL,
    119				DRM_BRIDGE_ATTACH_NO_CONNECTOR);
    120	if (ret) {
    121		dev_err(rcdu->dev,
    122			"failed to attach bridge %pOF for output %s (%d)\n",
    123			bridge->of_node, rcar_du_output_name(output), ret);
    124		return ret;
    125	}
    126
    127	/* Create the connector for the chain of bridges. */
    128	connector = drm_bridge_connector_init(&rcdu->ddev, &renc->base);
    129	if (IS_ERR(connector)) {
    130		dev_err(rcdu->dev,
    131			"failed to created connector for output %s (%ld)\n",
    132			rcar_du_output_name(output), PTR_ERR(connector));
    133		return PTR_ERR(connector);
    134	}
    135
    136	return drm_connector_attach_encoder(connector, &renc->base);
    137}