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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
* Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
*/
#include <linux/export.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_of.h>
#include <drm/drm_panel.h>
#include <drm/drm_simple_kms_helper.h>
#include "tidss_crtc.h"
#include "tidss_drv.h"
#include "tidss_encoder.h"
static int tidss_encoder_atomic_check(struct drm_encoder *encoder,
struct drm_crtc_state *crtc_state,
struct drm_connector_state *conn_state)
{
struct drm_device *ddev = encoder->dev;
struct tidss_crtc_state *tcrtc_state = to_tidss_crtc_state(crtc_state);
struct drm_display_info *di = &conn_state->connector->display_info;
struct drm_bridge *bridge;
bool bus_flags_set = false;
dev_dbg(ddev->dev, "%s\n", __func__);
/*
* Take the bus_flags from the first bridge that defines
* bridge timings, or from the connector's display_info if no
* bridge defines the timings.
*/
drm_for_each_bridge_in_chain(encoder, bridge) {
if (!bridge->timings)
continue;
tcrtc_state->bus_flags = bridge->timings->input_bus_flags;
bus_flags_set = true;
break;
}
if (!di->bus_formats || di->num_bus_formats == 0) {
dev_err(ddev->dev, "%s: No bus_formats in connected display\n",
__func__);
return -EINVAL;
}
// XXX any cleaner way to set bus format and flags?
tcrtc_state->bus_format = di->bus_formats[0];
if (!bus_flags_set)
tcrtc_state->bus_flags = di->bus_flags;
return 0;
}
static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
.atomic_check = tidss_encoder_atomic_check,
};
struct drm_encoder *tidss_encoder_create(struct tidss_device *tidss,
u32 encoder_type, u32 possible_crtcs)
{
struct drm_encoder *enc;
int ret;
enc = devm_kzalloc(tidss->dev, sizeof(*enc), GFP_KERNEL);
if (!enc)
return ERR_PTR(-ENOMEM);
enc->possible_crtcs = possible_crtcs;
ret = drm_simple_encoder_init(&tidss->ddev, enc, encoder_type);
if (ret < 0)
return ERR_PTR(ret);
drm_encoder_helper_add(enc, &encoder_helper_funcs);
dev_dbg(tidss->dev, "Encoder create done\n");
return enc;
}
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