LXR linux/drivers/gpu/drm/rcar-du/rcar_du

   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
  26struct 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
  35static void rcar_du_hdmienc_disable(struct drm_encoder *encoder)
  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 (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
  50static void rcar_du_hdmienc_enable(struct drm_encoder *encoder)
  51{
  52        struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
  53        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
  65static 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        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
  87static 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        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
 100static 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
 107static 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
 118static const struct drm_encoder_funcs encoder_funcs = {
 119        .destroy = rcar_du_hdmienc_cleanup,
 120};
 121
 122int 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);
 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
 165error:
 166        put_device(hdmienc->dev);
 167        return ret;
 168}
 169