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         int dpms;
  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_dpms(struct drm_encoder *encoder, int mode)
  36 {
  37         struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
  38         struct drm_encoder_slave_funcs *sfuncs = to_slave_funcs(encoder);
  39
  40         if (mode != DRM_MODE_DPMS_ON)
  41                 mode = DRM_MODE_DPMS_OFF;
  42
  43         if (hdmienc->dpms == mode)
  44                 return;
  45
  46         if (mode == DRM_MODE_DPMS_ON && hdmienc->renc->lvds)
  47                 rcar_du_lvdsenc_dpms(hdmienc->renc->lvds, encoder->crtc, mode);
  48
  49         if (sfuncs->dpms)
  50                 sfuncs->dpms(encoder, mode);
  51
  52         if (mode != DRM_MODE_DPMS_ON && hdmienc->renc->lvds)
  53                 rcar_du_lvdsenc_dpms(hdmienc->renc->lvds, encoder->crtc, mode);
  54
  55         hdmienc->dpms = mode;
  56 }
  57
  58 static bool rcar_du_hdmienc_mode_fixup(struct drm_encoder *encoder,
  59                                        const struct drm_display_mode *mode,
  60                                        struct drm_display_mode *adjusted_mode)
  61 {
  62         struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
  63         struct drm_encoder_slave_funcs *sfuncs = to_slave_funcs(encoder);
  64
  65         /* The internal LVDS encoder has a clock frequency operating range of
  66          * 30MHz to 150MHz. Clamp the clock accordingly.
  67          */
  68         if (hdmienc->renc->lvds)
  69                 adjusted_mode->clock = clamp(adjusted_mode->clock,
  70                                              30000, 150000);
  71
  72         if (sfuncs->mode_fixup == NULL)
  73                 return true;
  74
  75         return sfuncs->mode_fixup(encoder, mode, adjusted_mode);
  76 }
  77
  78 static void rcar_du_hdmienc_mode_prepare(struct drm_encoder *encoder)
  79 {
  80         rcar_du_hdmienc_dpms(encoder, DRM_MODE_DPMS_OFF);
  81 }
  82
  83 static void rcar_du_hdmienc_mode_commit(struct drm_encoder *encoder)
  84 {
  85         rcar_du_hdmienc_dpms(encoder, DRM_MODE_DPMS_ON);
  86 }
  87
  88 static void rcar_du_hdmienc_mode_set(struct drm_encoder *encoder,
  89                                      struct drm_display_mode *mode,
  90                                      struct drm_display_mode *adjusted_mode)
  91 {
  92         struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
  93         struct drm_encoder_slave_funcs *sfuncs = to_slave_funcs(encoder);
  94
  95         if (sfuncs->mode_set)
  96                 sfuncs->mode_set(encoder, mode, adjusted_mode);
  97
  98         rcar_du_crtc_route_output(encoder->crtc, hdmienc->renc->output);
  99 }
 100
 101 static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
 102         .dpms = rcar_du_hdmienc_dpms,
 103         .mode_fixup = rcar_du_hdmienc_mode_fixup,
 104         .prepare = rcar_du_hdmienc_mode_prepare,
 105         .commit = rcar_du_hdmienc_mode_commit,
 106         .mode_set = rcar_du_hdmienc_mode_set,
 107 };
 108
 109 static void rcar_du_hdmienc_cleanup(struct drm_encoder *encoder)
 110 {
 111         struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
 112
 113         rcar_du_hdmienc_dpms(encoder, DRM_MODE_DPMS_OFF);
 114
 115         drm_encoder_cleanup(encoder);
 116         put_device(hdmienc->dev);
 117 }
 118
 119 static const struct drm_encoder_funcs encoder_funcs = {
 120         .destroy = rcar_du_hdmienc_cleanup,
 121 };
 122
 123 int rcar_du_hdmienc_init(struct rcar_du_device *rcdu,
 124                          struct rcar_du_encoder *renc, struct device_node *np)
 125 {
 126         struct drm_encoder *encoder = rcar_encoder_to_drm_encoder(renc);
 127         struct drm_i2c_encoder_driver *driver;
 128         struct i2c_client *i2c_slave;
 129         struct rcar_du_hdmienc *hdmienc;
 130         int ret;
 131
 132         hdmienc = devm_kzalloc(rcdu->dev, sizeof(*hdmienc), GFP_KERNEL);
 133         if (hdmienc == NULL)
 134                 return -ENOMEM;
 135
 136         /* Locate the slave I2C device and driver. */
 137         i2c_slave = of_find_i2c_device_by_node(np);
 138         if (!i2c_slave || !i2c_get_clientdata(i2c_slave))
 139                 return -EPROBE_DEFER;
 140
 141         hdmienc->dev = &i2c_slave->dev;
 142
 143         if (hdmienc->dev->driver == NULL) {
 144                 ret = -EPROBE_DEFER;
 145                 goto error;
 146         }
 147
 148         /* Initialize the slave encoder. */
 149         driver = to_drm_i2c_encoder_driver(to_i2c_driver(hdmienc->dev->driver));
 150         ret = driver->encoder_init(i2c_slave, rcdu->ddev, &renc->slave);
 151         if (ret < 0)
 152                 goto error;
 153
 154         ret = drm_encoder_init(rcdu->ddev, encoder, &encoder_funcs,
 155                                DRM_MODE_ENCODER_TMDS);
 156         if (ret < 0)
 157                 goto error;
 158
 159         drm_encoder_helper_add(encoder, &encoder_helper_funcs);
 160
 161         renc->hdmi = hdmienc;
 162         hdmienc->renc = renc;
 163
 164         return 0;
 165
 166 error:
 167         put_device(hdmienc->dev);
 168         return ret;
 169 }