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         /* The internal LVDS encoder has a clock frequency operating range of
  75          * 30MHz to 150MHz. Clamp the clock accordingly.
  76          */
  77         if (hdmienc->renc->lvds)
  78                 adjusted_mode->clock = clamp(adjusted_mode->clock,
  79                                              30000, 150000);
  80
  81         if (sfuncs->mode_fixup == NULL)
  82                 return 0;
  83
  84         return sfuncs->mode_fixup(encoder, mode, adjusted_mode) ? 0 : -EINVAL;
  85 }
  86
  87 static void rcar_du_hdmienc_mode_set(struct drm_encoder *encoder,
  88                                      struct drm_display_mode *mode,
  89                                      struct drm_display_mode *adjusted_mode)
  90 {
  91         struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
  92         const struct drm_encoder_slave_funcs *sfuncs = to_slave_funcs(encoder);
  93
  94         if (sfuncs->mode_set)
  95                 sfuncs->mode_set(encoder, mode, adjusted_mode);
  96
  97         rcar_du_crtc_route_output(encoder->crtc, hdmienc->renc->output);
  98 }
  99
 100 static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
 101         .mode_set = rcar_du_hdmienc_mode_set,
 102         .disable = rcar_du_hdmienc_disable,
 103         .enable = rcar_du_hdmienc_enable,
 104         .atomic_check = rcar_du_hdmienc_atomic_check,
 105 };
 106
 107 static void rcar_du_hdmienc_cleanup(struct drm_encoder *encoder)
 108 {
 109         struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
 110
 111         if (hdmienc->enabled)
 112                 rcar_du_hdmienc_disable(encoder);
 113
 114         drm_encoder_cleanup(encoder);
 115         put_device(hdmienc->dev);
 116 }
 117
 118 static const struct drm_encoder_funcs encoder_funcs = {
 119         .destroy = rcar_du_hdmienc_cleanup,
 120 };
 121
 122 int rcar_du_hdmienc_init(struct rcar_du_device *rcdu,
 123                          struct rcar_du_encoder *renc, struct device_node *np)
 124 {
 125         struct drm_encoder *encoder = rcar_encoder_to_drm_encoder(renc);
 126         struct drm_i2c_encoder_driver *driver;
 127         struct i2c_client *i2c_slave;
 128         struct rcar_du_hdmienc *hdmienc;
 129         int ret;
 130
 131         hdmienc = devm_kzalloc(rcdu->dev, sizeof(*hdmienc), GFP_KERNEL);
 132         if (hdmienc == NULL)
 133                 return -ENOMEM;
 134
 135         /* Locate the slave I2C device and driver. */
 136         i2c_slave = of_find_i2c_device_by_node(np);
 137         if (!i2c_slave || !i2c_get_clientdata(i2c_slave))
 138                 return -EPROBE_DEFER;
 139
 140         hdmienc->dev = &i2c_slave->dev;
 141
 142         if (hdmienc->dev->driver == NULL) {
 143                 ret = -EPROBE_DEFER;
 144                 goto error;
 145         }
 146
 147         /* Initialize the slave encoder. */
 148         driver = to_drm_i2c_encoder_driver(to_i2c_driver(hdmienc->dev->driver));
 149         ret = driver->encoder_init(i2c_slave, rcdu->ddev, &renc->slave);
 150         if (ret < 0)
 151                 goto error;
 152
 153         ret = drm_encoder_init(rcdu->ddev, encoder, &encoder_funcs,
 154                                DRM_MODE_ENCODER_TMDS, NULL);
 155         if (ret < 0)
 156                 goto error;
 157
 158         drm_encoder_helper_add(encoder, &encoder_helper_funcs);
 159
 160         renc->hdmi = hdmienc;
 161         hdmienc->renc = renc;
 162
 163         return 0;
 164
 165 error:
 166         put_device(hdmienc->dev);
 167         return ret;
 168 }