drivers/gpu/drm/msm/edp/edp.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.
   4  */
   5
   6 #include <linux/of_irq.h>
   7 #include "edp.h"
   8
   9 static irqreturn_t edp_irq(int irq, void *dev_id)
  10 {
  11         struct msm_edp *edp = dev_id;
  12
  13         /* Process eDP irq */
  14         return msm_edp_ctrl_irq(edp->ctrl);
  15 }
  16
  17 static void edp_destroy(struct platform_device *pdev)
  18 {
  19         struct msm_edp *edp = platform_get_drvdata(pdev);
  20
  21         if (!edp)
  22                 return;
  23
  24         if (edp->ctrl) {
  25                 msm_edp_ctrl_destroy(edp->ctrl);
  26                 edp->ctrl = NULL;
  27         }
  28
  29         platform_set_drvdata(pdev, NULL);
  30 }
  31
  32 /* construct eDP at bind/probe time, grab all the resources. */
  33 static struct msm_edp *edp_init(struct platform_device *pdev)
  34 {
  35         struct msm_edp *edp = NULL;
  36         int ret;
  37
  38         if (!pdev) {
  39                 pr_err("no eDP device\n");
  40                 ret = -ENXIO;
  41                 goto fail;
  42         }
  43
  44         edp = devm_kzalloc(&pdev->dev, sizeof(*edp), GFP_KERNEL);
  45         if (!edp) {
  46                 ret = -ENOMEM;
  47                 goto fail;
  48         }
  49         DBG("eDP probed=%p", edp);
  50
  51         edp->pdev = pdev;
  52         platform_set_drvdata(pdev, edp);
  53
  54         ret = msm_edp_ctrl_init(edp);
  55         if (ret)
  56                 goto fail;
  57
  58         return edp;
  59
  60 fail:
  61         if (edp)
  62                 edp_destroy(pdev);
  63
  64         return ERR_PTR(ret);
  65 }
  66
  67 static int edp_bind(struct device *dev, struct device *master, void *data)
  68 {
  69         struct drm_device *drm = dev_get_drvdata(master);
  70         struct msm_drm_private *priv = drm->dev_private;
  71         struct msm_edp *edp;
  72
  73         DBG("");
  74         edp = edp_init(to_platform_device(dev));
  75         if (IS_ERR(edp))
  76                 return PTR_ERR(edp);
  77         priv->edp = edp;
  78
  79         return 0;
  80 }
  81
  82 static void edp_unbind(struct device *dev, struct device *master, void *data)
  83 {
  84         struct drm_device *drm = dev_get_drvdata(master);
  85         struct msm_drm_private *priv = drm->dev_private;
  86
  87         DBG("");
  88         if (priv->edp) {
  89                 edp_destroy(to_platform_device(dev));
  90                 priv->edp = NULL;
  91         }
  92 }
  93
  94 static const struct component_ops edp_ops = {
  95                 .bind   = edp_bind,
  96                 .unbind = edp_unbind,
  97 };
  98
  99 static int edp_dev_probe(struct platform_device *pdev)
 100 {
 101         DBG("");
 102         return component_add(&pdev->dev, &edp_ops);
 103 }
 104
 105 static int edp_dev_remove(struct platform_device *pdev)
 106 {
 107         DBG("");
 108         component_del(&pdev->dev, &edp_ops);
 109         return 0;
 110 }
 111
 112 static const struct of_device_id dt_match[] = {
 113         { .compatible = "qcom,mdss-edp" },
 114         {}
 115 };
 116
 117 static struct platform_driver edp_driver = {
 118         .probe = edp_dev_probe,
 119         .remove = edp_dev_remove,
 120         .driver = {
 121                 .name = "msm_edp",
 122                 .of_match_table = dt_match,
 123         },
 124 };
 125
 126 void __init msm_edp_register(void)
 127 {
 128         DBG("");
 129         platform_driver_register(&edp_driver);
 130 }
 131
 132 void __exit msm_edp_unregister(void)
 133 {
 134         DBG("");
 135         platform_driver_unregister(&edp_driver);
 136 }
 137
 138 /* Second part of initialization, the drm/kms level modeset_init */
 139 int msm_edp_modeset_init(struct msm_edp *edp, struct drm_device *dev,
 140                                 struct drm_encoder *encoder)
 141 {
 142         struct platform_device *pdev = edp->pdev;
 143         struct msm_drm_private *priv = dev->dev_private;
 144         int ret;
 145
 146         edp->encoder = encoder;
 147         edp->dev = dev;
 148
 149         edp->bridge = msm_edp_bridge_init(edp);
 150         if (IS_ERR(edp->bridge)) {
 151                 ret = PTR_ERR(edp->bridge);
 152                 DRM_DEV_ERROR(dev->dev, "failed to create eDP bridge: %d\n", ret);
 153                 edp->bridge = NULL;
 154                 goto fail;
 155         }
 156
 157         edp->connector = msm_edp_connector_init(edp);
 158         if (IS_ERR(edp->connector)) {
 159                 ret = PTR_ERR(edp->connector);
 160                 DRM_DEV_ERROR(dev->dev, "failed to create eDP connector: %d\n", ret);
 161                 edp->connector = NULL;
 162                 goto fail;
 163         }
 164
 165         edp->irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
 166         if (edp->irq < 0) {
 167                 ret = edp->irq;
 168                 DRM_DEV_ERROR(dev->dev, "failed to get IRQ: %d\n", ret);
 169                 goto fail;
 170         }
 171
 172         ret = devm_request_irq(&pdev->dev, edp->irq,
 173                         edp_irq, IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
 174                         "edp_isr", edp);
 175         if (ret < 0) {
 176                 DRM_DEV_ERROR(dev->dev, "failed to request IRQ%u: %d\n",
 177                                 edp->irq, ret);
 178                 goto fail;
 179         }
 180
 181         ret = drm_bridge_attach(encoder, edp->bridge, NULL);
 182         if (ret)
 183                 goto fail;
 184
 185         priv->bridges[priv->num_bridges++]       = edp->bridge;
 186         priv->connectors[priv->num_connectors++] = edp->connector;
 187
 188         return 0;
 189
 190 fail:
 191         /* bridge/connector are normally destroyed by drm */
 192         if (edp->bridge) {
 193                 edp_bridge_destroy(edp->bridge);
 194                 edp->bridge = NULL;
 195         }
 196         if (edp->connector) {
 197                 edp->connector->funcs->destroy(edp->connector);
 198                 edp->connector = NULL;
 199         }
 200
 201         return ret;
 202 }