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/*
* rcar_du_encoder.c -- R-Car Display Unit Encoder
*
* Copyright (C) 2013-2014 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/export.h>
#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include "rcar_du_drv.h"
#include "rcar_du_encoder.h"
#include "rcar_du_kms.h"
#include "rcar_du_lvdscon.h"
#include "rcar_du_lvdsenc.h"
#include "rcar_du_vgacon.h"
/* -----------------------------------------------------------------------------
* Common connector functions
*/
struct drm_encoder *
rcar_du_connector_best_encoder(struct drm_connector *connector)
{
struct rcar_du_connector *rcon = to_rcar_connector(connector);
return rcar_encoder_to_drm_encoder(rcon->encoder);
}
/* -----------------------------------------------------------------------------
* Encoder
*/
static void rcar_du_encoder_dpms(struct drm_encoder *encoder, int mode)
{
struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
if (renc->lvds)
rcar_du_lvdsenc_dpms(renc->lvds, encoder->crtc, mode);
}
static bool rcar_du_encoder_mode_fixup(struct drm_encoder *encoder,
const struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
{
struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
const struct drm_display_mode *panel_mode;
struct drm_device *dev = encoder->dev;
struct drm_connector *connector;
bool found = false;
/* DAC encoders have currently no restriction on the mode. */
if (encoder->encoder_type == DRM_MODE_ENCODER_DAC)
return true;
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
if (connector->encoder == encoder) {
found = true;
break;
}
}
if (!found) {
dev_dbg(dev->dev, "mode_fixup: no connector found\n");
return false;
}
if (list_empty(&connector->modes)) {
dev_dbg(dev->dev, "mode_fixup: empty modes list\n");
return false;
}
panel_mode = list_first_entry(&connector->modes,
struct drm_display_mode, head);
/* We're not allowed to modify the resolution. */
if (mode->hdisplay != panel_mode->hdisplay ||
mode->vdisplay != panel_mode->vdisplay)
return false;
/* The flat panel mode is fixed, just copy it to the adjusted mode. */
drm_mode_copy(adjusted_mode, panel_mode);
/* The internal LVDS encoder has a clock frequency operating range of
* 30MHz to 150MHz. Clamp the clock accordingly.
*/
if (renc->lvds)
adjusted_mode->clock = clamp(adjusted_mode->clock,
30000, 150000);
return true;
}
static void rcar_du_encoder_mode_prepare(struct drm_encoder *encoder)
{
struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
if (renc->lvds)
rcar_du_lvdsenc_dpms(renc->lvds, encoder->crtc,
DRM_MODE_DPMS_OFF);
}
static void rcar_du_encoder_mode_commit(struct drm_encoder *encoder)
{
struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
if (renc->lvds)
rcar_du_lvdsenc_dpms(renc->lvds, encoder->crtc,
DRM_MODE_DPMS_ON);
}
static void rcar_du_encoder_mode_set(struct drm_encoder *encoder,
struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
{
struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
rcar_du_crtc_route_output(encoder->crtc, renc->output);
}
static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
.dpms = rcar_du_encoder_dpms,
.mode_fixup = rcar_du_encoder_mode_fixup,
.prepare = rcar_du_encoder_mode_prepare,
.commit = rcar_du_encoder_mode_commit,
.mode_set = rcar_du_encoder_mode_set,
};
static const struct drm_encoder_funcs encoder_funcs = {
.destroy = drm_encoder_cleanup,
};
int rcar_du_encoder_init(struct rcar_du_device *rcdu,
enum rcar_du_encoder_type type,
enum rcar_du_output output,
struct device_node *enc_node,
struct device_node *con_node)
{
struct rcar_du_encoder *renc;
struct drm_encoder *encoder;
unsigned int encoder_type;
int ret;
renc = devm_kzalloc(rcdu->dev, sizeof(*renc), GFP_KERNEL);
if (renc == NULL)
return -ENOMEM;
renc->output = output;
encoder = rcar_encoder_to_drm_encoder(renc);
switch (output) {
case RCAR_DU_OUTPUT_LVDS0:
renc->lvds = rcdu->lvds[0];
break;
case RCAR_DU_OUTPUT_LVDS1:
renc->lvds = rcdu->lvds[1];
break;
default:
break;
}
switch (type) {
case RCAR_DU_ENCODER_VGA:
encoder_type = DRM_MODE_ENCODER_DAC;
break;
case RCAR_DU_ENCODER_LVDS:
encoder_type = DRM_MODE_ENCODER_LVDS;
break;
case RCAR_DU_ENCODER_NONE:
default:
/* No external encoder, use the internal encoder type. */
encoder_type = rcdu->info->routes[output].encoder_type;
break;
}
ret = drm_encoder_init(rcdu->ddev, encoder, &encoder_funcs,
encoder_type);
if (ret < 0)
return ret;
drm_encoder_helper_add(encoder, &encoder_helper_funcs);
switch (encoder_type) {
case DRM_MODE_ENCODER_LVDS:
return rcar_du_lvds_connector_init(rcdu, renc, con_node);
case DRM_MODE_ENCODER_DAC:
return rcar_du_vga_connector_init(rcdu, renc);
default:
return -EINVAL;
}
}
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