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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tilcdc_external.c (4300B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright (C) 2015 Texas Instruments
      4 * Author: Jyri Sarha <jsarha@ti.com>
      5 */
      6
      7#include <linux/component.h>
      8#include <linux/of_graph.h>
      9
     10#include <drm/drm_atomic_helper.h>
     11#include <drm/drm_bridge.h>
     12#include <drm/drm_of.h>
     13#include <drm/drm_simple_kms_helper.h>
     14
     15#include "tilcdc_drv.h"
     16#include "tilcdc_external.h"
     17
     18static const struct tilcdc_panel_info panel_info_tda998x = {
     19		.ac_bias                = 255,
     20		.ac_bias_intrpt         = 0,
     21		.dma_burst_sz           = 16,
     22		.bpp                    = 16,
     23		.fdd                    = 0x80,
     24		.tft_alt_mode           = 0,
     25		.invert_pxl_clk		= 1,
     26		.sync_edge              = 1,
     27		.sync_ctrl              = 1,
     28		.raster_order           = 0,
     29};
     30
     31static const struct tilcdc_panel_info panel_info_default = {
     32		.ac_bias                = 255,
     33		.ac_bias_intrpt         = 0,
     34		.dma_burst_sz           = 16,
     35		.bpp                    = 16,
     36		.fdd                    = 0x80,
     37		.tft_alt_mode           = 0,
     38		.sync_edge              = 0,
     39		.sync_ctrl              = 1,
     40		.raster_order           = 0,
     41};
     42
     43static
     44struct drm_connector *tilcdc_encoder_find_connector(struct drm_device *ddev,
     45						    struct drm_encoder *encoder)
     46{
     47	struct drm_connector *connector;
     48
     49	list_for_each_entry(connector, &ddev->mode_config.connector_list, head) {
     50		if (drm_connector_has_possible_encoder(connector, encoder))
     51			return connector;
     52	}
     53
     54	dev_err(ddev->dev, "No connector found for %s encoder (id %d)\n",
     55		encoder->name, encoder->base.id);
     56
     57	return NULL;
     58}
     59
     60int tilcdc_add_component_encoder(struct drm_device *ddev)
     61{
     62	struct tilcdc_drm_private *priv = ddev->dev_private;
     63	struct drm_encoder *encoder = NULL, *iter;
     64
     65	list_for_each_entry(iter, &ddev->mode_config.encoder_list, head)
     66		if (iter->possible_crtcs & (1 << priv->crtc->index)) {
     67			encoder = iter;
     68			break;
     69		}
     70
     71	if (!encoder) {
     72		dev_err(ddev->dev, "%s: No suitable encoder found\n", __func__);
     73		return -ENODEV;
     74	}
     75
     76	priv->external_connector =
     77		tilcdc_encoder_find_connector(ddev, encoder);
     78
     79	if (!priv->external_connector)
     80		return -ENODEV;
     81
     82	/* Only tda998x is supported at the moment. */
     83	tilcdc_crtc_set_simulate_vesa_sync(priv->crtc, true);
     84	tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_tda998x);
     85
     86	return 0;
     87}
     88
     89static
     90int tilcdc_attach_bridge(struct drm_device *ddev, struct drm_bridge *bridge)
     91{
     92	struct tilcdc_drm_private *priv = ddev->dev_private;
     93	int ret;
     94
     95	priv->external_encoder->possible_crtcs = BIT(0);
     96
     97	ret = drm_bridge_attach(priv->external_encoder, bridge, NULL, 0);
     98	if (ret)
     99		return ret;
    100
    101	tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_default);
    102
    103	priv->external_connector =
    104		tilcdc_encoder_find_connector(ddev, priv->external_encoder);
    105	if (!priv->external_connector)
    106		return -ENODEV;
    107
    108	return 0;
    109}
    110
    111int tilcdc_attach_external_device(struct drm_device *ddev)
    112{
    113	struct tilcdc_drm_private *priv = ddev->dev_private;
    114	struct drm_bridge *bridge;
    115	struct drm_panel *panel;
    116	int ret;
    117
    118	ret = drm_of_find_panel_or_bridge(ddev->dev->of_node, 0, 0,
    119					  &panel, &bridge);
    120	if (ret == -ENODEV)
    121		return 0;
    122	else if (ret)
    123		return ret;
    124
    125	priv->external_encoder = devm_kzalloc(ddev->dev,
    126					      sizeof(*priv->external_encoder),
    127					      GFP_KERNEL);
    128	if (!priv->external_encoder)
    129		return -ENOMEM;
    130
    131	ret = drm_simple_encoder_init(ddev, priv->external_encoder,
    132				      DRM_MODE_ENCODER_NONE);
    133	if (ret) {
    134		dev_err(ddev->dev, "drm_encoder_init() failed %d\n", ret);
    135		return ret;
    136	}
    137
    138	if (panel) {
    139		bridge = devm_drm_panel_bridge_add_typed(ddev->dev, panel,
    140							 DRM_MODE_CONNECTOR_DPI);
    141		if (IS_ERR(bridge)) {
    142			ret = PTR_ERR(bridge);
    143			goto err_encoder_cleanup;
    144		}
    145	}
    146
    147	ret = tilcdc_attach_bridge(ddev, bridge);
    148	if (ret)
    149		goto err_encoder_cleanup;
    150
    151	return 0;
    152
    153err_encoder_cleanup:
    154	drm_encoder_cleanup(priv->external_encoder);
    155	return ret;
    156}
    157
    158static int dev_match_of(struct device *dev, void *data)
    159{
    160	return dev->of_node == data;
    161}
    162
    163int tilcdc_get_external_components(struct device *dev,
    164				   struct component_match **match)
    165{
    166	struct device_node *node;
    167
    168	node = of_graph_get_remote_node(dev->of_node, 0, 0);
    169
    170	if (!of_device_is_compatible(node, "nxp,tda998x")) {
    171		of_node_put(node);
    172		return 0;
    173	}
    174
    175	if (match)
    176		drm_of_component_match_add(dev, match, dev_match_of, node);
    177	of_node_put(node);
    178	return 1;
    179}