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/*
* R-Car Display Unit HDMI Encoder
*
* Copyright (C) 2014 Renesas Electronics Corporation
*
* Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/slab.h>
#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_encoder_slave.h>
#include "rcar_du_drv.h"
#include "rcar_du_encoder.h"
#include "rcar_du_hdmienc.h"
#include "rcar_du_lvdsenc.h"
struct rcar_du_hdmienc {
struct rcar_du_encoder *renc;
struct device *dev;
bool enabled;
};
#define to_rcar_hdmienc(e) (to_rcar_encoder(e)->hdmi)
#define to_slave_funcs(e) (to_rcar_encoder(e)->slave.slave_funcs)
static void rcar_du_hdmienc_disable(struct drm_encoder *encoder)
{
struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
const struct drm_encoder_slave_funcs *sfuncs = to_slave_funcs(encoder);
if (sfuncs->dpms)
sfuncs->dpms(encoder, DRM_MODE_DPMS_OFF);
if (hdmienc->renc->lvds)
rcar_du_lvdsenc_enable(hdmienc->renc->lvds, encoder->crtc,
false);
hdmienc->enabled = false;
}
static void rcar_du_hdmienc_enable(struct drm_encoder *encoder)
{
struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
const struct drm_encoder_slave_funcs *sfuncs = to_slave_funcs(encoder);
if (hdmienc->renc->lvds)
rcar_du_lvdsenc_enable(hdmienc->renc->lvds, encoder->crtc,
true);
if (sfuncs->dpms)
sfuncs->dpms(encoder, DRM_MODE_DPMS_ON);
hdmienc->enabled = true;
}
static int rcar_du_hdmienc_atomic_check(struct drm_encoder *encoder,
struct drm_crtc_state *crtc_state,
struct drm_connector_state *conn_state)
{
struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
const struct drm_encoder_slave_funcs *sfuncs = to_slave_funcs(encoder);
struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
const struct drm_display_mode *mode = &crtc_state->mode;
/* The internal LVDS encoder has a clock frequency operating range of
* 30MHz to 150MHz. Clamp the clock accordingly.
*/
if (hdmienc->renc->lvds)
adjusted_mode->clock = clamp(adjusted_mode->clock,
30000, 150000);
if (sfuncs->mode_fixup == NULL)
return 0;
return sfuncs->mode_fixup(encoder, mode, adjusted_mode) ? 0 : -EINVAL;
}
static void rcar_du_hdmienc_mode_set(struct drm_encoder *encoder,
struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
{
struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
const struct drm_encoder_slave_funcs *sfuncs = to_slave_funcs(encoder);
if (sfuncs->mode_set)
sfuncs->mode_set(encoder, mode, adjusted_mode);
rcar_du_crtc_route_output(encoder->crtc, hdmienc->renc->output);
}
static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
.mode_set = rcar_du_hdmienc_mode_set,
.disable = rcar_du_hdmienc_disable,
.enable = rcar_du_hdmienc_enable,
.atomic_check = rcar_du_hdmienc_atomic_check,
};
static void rcar_du_hdmienc_cleanup(struct drm_encoder *encoder)
{
struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
if (hdmienc->enabled)
rcar_du_hdmienc_disable(encoder);
drm_encoder_cleanup(encoder);
put_device(hdmienc->dev);
}
static const struct drm_encoder_funcs encoder_funcs = {
.destroy = rcar_du_hdmienc_cleanup,
};
int rcar_du_hdmienc_init(struct rcar_du_device *rcdu,
struct rcar_du_encoder *renc, struct device_node *np)
{
struct drm_encoder *encoder = rcar_encoder_to_drm_encoder(renc);
struct drm_i2c_encoder_driver *driver;
struct i2c_client *i2c_slave;
struct rcar_du_hdmienc *hdmienc;
int ret;
hdmienc = devm_kzalloc(rcdu->dev, sizeof(*hdmienc), GFP_KERNEL);
if (hdmienc == NULL)
return -ENOMEM;
/* Locate the slave I2C device and driver. */
i2c_slave = of_find_i2c_device_by_node(np);
if (!i2c_slave || !i2c_get_clientdata(i2c_slave))
return -EPROBE_DEFER;
hdmienc->dev = &i2c_slave->dev;
if (hdmienc->dev->driver == NULL) {
ret = -EPROBE_DEFER;
goto error;
}
/* Initialize the slave encoder. */
driver = to_drm_i2c_encoder_driver(to_i2c_driver(hdmienc->dev->driver));
ret = driver->encoder_init(i2c_slave, rcdu->ddev, &renc->slave);
if (ret < 0)
goto error;
ret = drm_encoder_init(rcdu->ddev, encoder, &encoder_funcs,
DRM_MODE_ENCODER_TMDS, NULL);
if (ret < 0)
goto error;
drm_encoder_helper_add(encoder, &encoder_helper_funcs);
renc->hdmi = hdmienc;
hdmienc->renc = renc;
return 0;
error:
put_device(hdmienc->dev);
return ret;
}
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