linux/drivers/gpu/drm/loongson/lsdc_output_7a1000.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2023 Loongson Technology Corporation Limited
 */

#include <drm/drm_atomic_helper.h>
#include <drm/drm_edid.h>
#include <drm/drm_probe_helper.h>

#include "lsdc_drv.h"
#include "lsdc_output.h"

/*
 * The display controller in the LS7A1000 exports two DVO interfaces, thus
 * external encoder is required, except connected to the DPI panel directly.
 *
 *       ___________________                                     _________
 *      |            -------|                                   |         |
 *      |  CRTC0 --> | DVO0 ----> Encoder0 ---> Connector0 ---> | Display |
 *      |  _   _     -------|        ^             ^            |_________|
 *      | | | | |  +------+ |        |             |
 *      | |_| |_|  | i2c6 | <--------+-------------+
 *      |          +------+ |
 *      |                   |
 *      |  DC in LS7A1000   |
 *      |                   |
 *      |  _   _   +------+ |
 *      | | | | |  | i2c7 | <--------+-------------+
 *      | |_| |_|  +------+ |        |             |             _________
 *      |            -------|        |             |            |         |
 *      |  CRTC1 --> | DVO1 ----> Encoder1 ---> Connector1 ---> |  Panel  |
 *      |            -------|                                   |_________|
 *      |___________________|
 *
 * Currently, we assume the external encoders connected to the DVO are
 * transparent. Loongson's DVO interface can directly drive RGB888 panels.
 *
 *  TODO: Add support for non-transparent encoders
 */

static int ls7a1000_dpi_connector_get_modes(struct drm_connector *conn)
{ … }

static struct drm_encoder *
ls7a1000_dpi_connector_get_best_encoder(struct drm_connector *connector,
					struct drm_atomic_state *state)
{ … }

static const struct drm_connector_helper_funcs
ls7a1000_dpi_connector_helpers = …;

static enum drm_connector_status
ls7a1000_dpi_connector_detect(struct drm_connector *connector, bool force)
{ … }

static const struct drm_connector_funcs ls7a1000_dpi_connector_funcs = …;

static void ls7a1000_pipe0_encoder_reset(struct drm_encoder *encoder)
{ … }

static void ls7a1000_pipe1_encoder_reset(struct drm_encoder *encoder)
{ … }

static const struct drm_encoder_funcs ls7a1000_encoder_funcs[2] = …;

int ls7a1000_output_init(struct drm_device *ddev,
			 struct lsdc_display_pipe *dispipe,
			 struct i2c_adapter *ddc,
			 unsigned int index)
{ … }