drivers/gpu/drm/rcar-du/rcar_du_hdmienc.c

   1 /*
   2  * R-Car Display Unit HDMI Encoder
   3  *
   4  * Copyright (C) 2014 Renesas Electronics Corporation
   5  *
   6  * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 #include <linux/slab.h>
  15
  16 #include <drm/drmP.h>
  17 #include <drm/drm_crtc.h>
  18 #include <drm/drm_crtc_helper.h>
  19 #include <drm/drm_encoder_slave.h>
  20
  21 #include "rcar_du_drv.h"
  22 #include "rcar_du_encoder.h"
  23 #include "rcar_du_hdmienc.h"
  24 #include "rcar_du_lvdsenc.h"
  25
  26 struct rcar_du_hdmienc {
  27         struct rcar_du_encoder *renc;
  28         struct device *dev;
  29         bool enabled;
  30 };
  31
  32 #define to_rcar_hdmienc(e)      (to_rcar_encoder(e)->hdmi)
  33 #define to_slave_funcs(e)       (to_rcar_encoder(e)->slave.slave_funcs)
  34
  35 static void rcar_du_hdmienc_disable(struct drm_encoder *encoder)
  36 {
  37         struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
  38         const struct drm_encoder_slave_funcs *sfuncs = to_slave_funcs(encoder);
  39
  40         if (sfuncs->dpms)
  41                 sfuncs->dpms(encoder, DRM_MODE_DPMS_OFF);
  42
  43         if (hdmienc->renc->lvds)
  44                 rcar_du_lvdsenc_enable(hdmienc->renc->lvds, encoder->crtc,
  45                                        false);
  46
  47         hdmienc->enabled = false;
  48 }
  49
  50 static void rcar_du_hdmienc_enable(struct drm_encoder *encoder)
  51 {
  52         struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
  53         const struct drm_encoder_slave_funcs *sfuncs = to_slave_funcs(encoder);
  54
  55         if (hdmienc->renc->lvds)
  56                 rcar_du_lvdsenc_enable(hdmienc->renc->lvds, encoder->crtc,
  57                                        true);
  58
  59         if (sfuncs->dpms)
  60                 sfuncs->dpms(encoder, DRM_MODE_DPMS_ON);
  61
  62         hdmienc->enabled = true;
  63 }
  64
  65 static int rcar_du_hdmienc_atomic_check(struct drm_encoder *encoder,
  66                                         struct drm_crtc_state *crtc_state,
  67                                         struct drm_connector_state *conn_state)
  68 {
  69         struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
  70         const struct drm_encoder_slave_funcs *sfuncs = to_slave_funcs(encoder);
  71         struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
  72         const struct drm_display_mode *mode = &crtc_state->mode;
  73
  74         if (hdmienc->renc->lvds)
  75                 rcar_du_lvdsenc_atomic_check(hdmienc->renc->lvds,
  76                                              adjusted_mode);
  77
  78         if (sfuncs->mode_fixup == NULL)
  79                 return 0;
  80
  81         return sfuncs->mode_fixup(encoder, mode, adjusted_mode) ? 0 : -EINVAL;
  82 }
  83
  84 static void rcar_du_hdmienc_mode_set(struct drm_encoder *encoder,
  85                                      struct drm_display_mode *mode,
  86                                      struct drm_display_mode *adjusted_mode)
  87 {
  88         struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
  89         const struct drm_encoder_slave_funcs *sfuncs = to_slave_funcs(encoder);
  90
  91         if (sfuncs->mode_set)
  92                 sfuncs->mode_set(encoder, mode, adjusted_mode);
  93
  94         rcar_du_crtc_route_output(encoder->crtc, hdmienc->renc->output);
  95 }
  96
  97 static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
  98         .mode_set = rcar_du_hdmienc_mode_set,
  99         .disable = rcar_du_hdmienc_disable,
 100         .enable = rcar_du_hdmienc_enable,
 101         .atomic_check = rcar_du_hdmienc_atomic_check,
 102 };
 103
 104 static void rcar_du_hdmienc_cleanup(struct drm_encoder *encoder)
 105 {
 106         struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
 107
 108         if (hdmienc->enabled)
 109                 rcar_du_hdmienc_disable(encoder);
 110
 111         drm_encoder_cleanup(encoder);
 112         put_device(hdmienc->dev);
 113 }
 114
 115 static const struct drm_encoder_funcs encoder_funcs = {
 116         .destroy = rcar_du_hdmienc_cleanup,
 117 };
 118
 119 int rcar_du_hdmienc_init(struct rcar_du_device *rcdu,
 120                          struct rcar_du_encoder *renc, struct device_node *np)
 121 {
 122         struct drm_encoder *encoder = rcar_encoder_to_drm_encoder(renc);
 123         struct drm_i2c_encoder_driver *driver;
 124         struct i2c_client *i2c_slave;
 125         struct rcar_du_hdmienc *hdmienc;
 126         int ret;
 127
 128         hdmienc = devm_kzalloc(rcdu->dev, sizeof(*hdmienc), GFP_KERNEL);
 129         if (hdmienc == NULL)
 130                 return -ENOMEM;
 131
 132         /* Locate the slave I2C device and driver. */
 133         i2c_slave = of_find_i2c_device_by_node(np);
 134         if (!i2c_slave || !i2c_get_clientdata(i2c_slave)) {
 135                 dev_dbg(rcdu->dev,
 136                         "can't get I2C slave for %s, deferring probe\n",
 137                         of_node_full_name(np));
 138                 return -EPROBE_DEFER;
 139         }
 140
 141         hdmienc->dev = &i2c_slave->dev;
 142
 143         if (hdmienc->dev->driver == NULL) {
 144                 dev_dbg(rcdu->dev,
 145                         "I2C slave %s not probed yet, deferring probe\n",
 146                         dev_name(hdmienc->dev));
 147                 ret = -EPROBE_DEFER;
 148                 goto error;
 149         }
 150
 151         /* Initialize the slave encoder. */
 152         driver = to_drm_i2c_encoder_driver(to_i2c_driver(hdmienc->dev->driver));
 153         ret = driver->encoder_init(i2c_slave, rcdu->ddev, &renc->slave);
 154         if (ret < 0)
 155                 goto error;
 156
 157         ret = drm_encoder_init(rcdu->ddev, encoder, &encoder_funcs,
 158                                DRM_MODE_ENCODER_TMDS, NULL);
 159         if (ret < 0)
 160                 goto error;
 161
 162         drm_encoder_helper_add(encoder, &encoder_helper_funcs);
 163
 164         renc->hdmi = hdmienc;
 165         hdmienc->renc = renc;
 166
 167         return 0;
 168
 169 error:
 170         put_device(hdmienc->dev);
 171         return ret;
 172 }