Jyri Sarha | 103cd8b | 2015-02-10 14:13:23 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2015 Texas Instruments |
| 3 | * Author: Jyri Sarha <jsarha@ti.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 as published by |
| 7 | * the Free Software Foundation. |
| 8 | * |
| 9 | */ |
| 10 | |
| 11 | #include <linux/component.h> |
| 12 | #include <linux/of_graph.h> |
| 13 | |
| 14 | #include "tilcdc_drv.h" |
| 15 | #include "tilcdc_external.h" |
| 16 | |
| 17 | static const struct tilcdc_panel_info panel_info_tda998x = { |
| 18 | .ac_bias = 255, |
| 19 | .ac_bias_intrpt = 0, |
| 20 | .dma_burst_sz = 16, |
| 21 | .bpp = 16, |
| 22 | .fdd = 0x80, |
| 23 | .tft_alt_mode = 0, |
| 24 | .invert_pxl_clk = 1, |
| 25 | .sync_edge = 1, |
| 26 | .sync_ctrl = 1, |
| 27 | .raster_order = 0, |
| 28 | }; |
| 29 | |
| 30 | static int tilcdc_external_mode_valid(struct drm_connector *connector, |
| 31 | struct drm_display_mode *mode) |
| 32 | { |
| 33 | struct tilcdc_drm_private *priv = connector->dev->dev_private; |
| 34 | int ret, i; |
| 35 | |
| 36 | ret = tilcdc_crtc_mode_valid(priv->crtc, mode); |
| 37 | if (ret != MODE_OK) |
| 38 | return ret; |
| 39 | |
| 40 | for (i = 0; i < priv->num_connectors && |
| 41 | priv->connectors[i] != connector; i++) |
| 42 | ; |
| 43 | |
| 44 | BUG_ON(priv->connectors[i] != connector); |
| 45 | BUG_ON(!priv->connector_funcs[i]); |
| 46 | |
| 47 | /* If the connector has its own mode_valid call it. */ |
| 48 | if (!IS_ERR(priv->connector_funcs[i]) && |
| 49 | priv->connector_funcs[i]->mode_valid) |
| 50 | return priv->connector_funcs[i]->mode_valid(connector, mode); |
| 51 | |
| 52 | return MODE_OK; |
| 53 | } |
| 54 | |
| 55 | static int tilcdc_add_external_encoder(struct drm_device *dev, int *bpp, |
| 56 | struct drm_connector *connector) |
| 57 | { |
| 58 | struct tilcdc_drm_private *priv = dev->dev_private; |
| 59 | struct drm_connector_helper_funcs *connector_funcs; |
| 60 | |
| 61 | priv->connectors[priv->num_connectors] = connector; |
| 62 | priv->encoders[priv->num_encoders++] = connector->encoder; |
| 63 | |
| 64 | /* Only tda998x is supported at the moment. */ |
| 65 | tilcdc_crtc_set_simulate_vesa_sync(priv->crtc, true); |
| 66 | tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_tda998x); |
| 67 | *bpp = panel_info_tda998x.bpp; |
| 68 | |
| 69 | connector_funcs = devm_kzalloc(dev->dev, sizeof(*connector_funcs), |
| 70 | GFP_KERNEL); |
| 71 | if (!connector_funcs) |
| 72 | return -ENOMEM; |
| 73 | |
| 74 | /* connector->helper_private contains always struct |
| 75 | * connector_helper_funcs pointer. For tilcdc crtc to have a |
| 76 | * say if a specific mode is Ok, we need to install our own |
| 77 | * helper functions. In our helper functions we copy |
| 78 | * everything else but use our own mode_valid() (above). |
| 79 | */ |
| 80 | if (connector->helper_private) { |
| 81 | priv->connector_funcs[priv->num_connectors] = |
| 82 | connector->helper_private; |
| 83 | *connector_funcs = *priv->connector_funcs[priv->num_connectors]; |
| 84 | } else { |
| 85 | priv->connector_funcs[priv->num_connectors] = ERR_PTR(-ENOENT); |
| 86 | } |
| 87 | connector_funcs->mode_valid = tilcdc_external_mode_valid; |
| 88 | drm_connector_helper_add(connector, connector_funcs); |
| 89 | priv->num_connectors++; |
| 90 | |
| 91 | dev_dbg(dev->dev, "External encoder '%s' connected\n", |
| 92 | connector->encoder->name); |
| 93 | |
| 94 | return 0; |
| 95 | } |
| 96 | |
| 97 | int tilcdc_add_external_encoders(struct drm_device *dev, int *bpp) |
| 98 | { |
| 99 | struct tilcdc_drm_private *priv = dev->dev_private; |
| 100 | struct drm_connector *connector; |
| 101 | int num_internal_connectors = priv->num_connectors; |
| 102 | |
| 103 | list_for_each_entry(connector, &dev->mode_config.connector_list, head) { |
| 104 | bool found = false; |
| 105 | int i, ret; |
| 106 | |
| 107 | for (i = 0; i < num_internal_connectors; i++) |
| 108 | if (connector == priv->connectors[i]) |
| 109 | found = true; |
| 110 | if (!found) { |
| 111 | ret = tilcdc_add_external_encoder(dev, bpp, connector); |
| 112 | if (ret) |
| 113 | return ret; |
| 114 | } |
| 115 | } |
| 116 | return 0; |
| 117 | } |
| 118 | |
| 119 | void tilcdc_remove_external_encoders(struct drm_device *dev) |
| 120 | { |
| 121 | struct tilcdc_drm_private *priv = dev->dev_private; |
| 122 | int i; |
| 123 | |
| 124 | /* Restore the original helper functions, if any. */ |
| 125 | for (i = 0; i < priv->num_connectors; i++) |
| 126 | if (IS_ERR(priv->connector_funcs[i])) |
| 127 | drm_connector_helper_add(priv->connectors[i], NULL); |
| 128 | else if (priv->connector_funcs[i]) |
| 129 | drm_connector_helper_add(priv->connectors[i], |
| 130 | priv->connector_funcs[i]); |
| 131 | } |
| 132 | |
| 133 | static int dev_match_of(struct device *dev, void *data) |
| 134 | { |
| 135 | return dev->of_node == data; |
| 136 | } |
| 137 | |
| 138 | int tilcdc_get_external_components(struct device *dev, |
| 139 | struct component_match **match) |
| 140 | { |
| 141 | struct device_node *ep = NULL; |
| 142 | int count = 0; |
| 143 | |
| 144 | while ((ep = of_graph_get_next_endpoint(dev->of_node, ep))) { |
| 145 | struct device_node *node; |
| 146 | |
| 147 | node = of_graph_get_remote_port_parent(ep); |
| 148 | if (!node && !of_device_is_available(node)) { |
| 149 | of_node_put(node); |
| 150 | continue; |
| 151 | } |
| 152 | |
| 153 | dev_dbg(dev, "Subdevice node '%s' found\n", node->name); |
| 154 | if (match) |
| 155 | component_match_add(dev, match, dev_match_of, node); |
| 156 | of_node_put(node); |
| 157 | count++; |
| 158 | } |
| 159 | |
| 160 | if (count > 1) { |
| 161 | dev_err(dev, "Only one external encoder is supported\n"); |
| 162 | return -EINVAL; |
| 163 | } |
| 164 | |
| 165 | return count; |
| 166 | } |