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// 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)
{
unsigned int num = 0;
struct edid *edid;
if (conn->ddc) {
edid = drm_get_edid(conn, conn->ddc);
if (edid) {
drm_connector_update_edid_property(conn, edid);
num = drm_add_edid_modes(conn, edid);
kfree(edid);
}
return num;
}
num = drm_add_modes_noedid(conn, 1920, 1200);
drm_set_preferred_mode(conn, 1024, 768);
return num;
}
static struct drm_encoder *
ls7a1000_dpi_connector_get_best_encoder(struct drm_connector *connector,
struct drm_atomic_state *state)
{
struct lsdc_output *output = connector_to_lsdc_output(connector);
return &output->encoder;
}
static const struct drm_connector_helper_funcs
ls7a1000_dpi_connector_helpers = {
.atomic_best_encoder = ls7a1000_dpi_connector_get_best_encoder,
.get_modes = ls7a1000_dpi_connector_get_modes,
};
static enum drm_connector_status
ls7a1000_dpi_connector_detect(struct drm_connector *connector, bool force)
{
struct i2c_adapter *ddc = connector->ddc;
if (ddc) {
if (drm_probe_ddc(ddc))
return connector_status_connected;
return connector_status_disconnected;
}
return connector_status_unknown;
}
static const struct drm_connector_funcs ls7a1000_dpi_connector_funcs = {
.detect = ls7a1000_dpi_connector_detect,
.fill_modes = drm_helper_probe_single_connector_modes,
.destroy = drm_connector_cleanup,
.reset = drm_atomic_helper_connector_reset,
.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state
};
static void ls7a1000_pipe0_encoder_reset(struct drm_encoder *encoder)
{
struct drm_device *ddev = encoder->dev;
struct lsdc_device *ldev = to_lsdc(ddev);
/*
* We need this for S3 support, screen will not lightup if don't set
* this register correctly.
*/
lsdc_wreg32(ldev, LSDC_CRTC0_DVO_CONF_REG,
PHY_CLOCK_POL | PHY_CLOCK_EN | PHY_DATA_EN);
}
static void ls7a1000_pipe1_encoder_reset(struct drm_encoder *encoder)
{
struct drm_device *ddev = encoder->dev;
struct lsdc_device *ldev = to_lsdc(ddev);
/*
* We need this for S3 support, screen will not lightup if don't set
* this register correctly.
*/
/* DVO */
lsdc_wreg32(ldev, LSDC_CRTC1_DVO_CONF_REG,
BIT(31) | PHY_CLOCK_POL | PHY_CLOCK_EN | PHY_DATA_EN);
}
static const struct drm_encoder_funcs ls7a1000_encoder_funcs[2] = {
{
.reset = ls7a1000_pipe0_encoder_reset,
.destroy = drm_encoder_cleanup,
},
{
.reset = ls7a1000_pipe1_encoder_reset,
.destroy = drm_encoder_cleanup,
},
};
int ls7a1000_output_init(struct drm_device *ddev,
struct lsdc_display_pipe *dispipe,
struct i2c_adapter *ddc,
unsigned int index)
{
struct lsdc_output *output = &dispipe->output;
struct drm_encoder *encoder = &output->encoder;
struct drm_connector *connector = &output->connector;
int ret;
ret = drm_encoder_init(ddev, encoder, &ls7a1000_encoder_funcs[index],
DRM_MODE_ENCODER_TMDS, "encoder-%u", index);
if (ret)
return ret;
encoder->possible_crtcs = BIT(index);
ret = drm_connector_init_with_ddc(ddev, connector,
&ls7a1000_dpi_connector_funcs,
DRM_MODE_CONNECTOR_DPI, ddc);
if (ret)
return ret;
drm_info(ddev, "display pipe-%u has a DVO\n", index);
drm_connector_helper_add(connector, &ls7a1000_dpi_connector_helpers);
drm_connector_attach_encoder(connector, encoder);
connector->polled = DRM_CONNECTOR_POLL_CONNECT |
DRM_CONNECTOR_POLL_DISCONNECT;
connector->interlace_allowed = 0;
connector->doublescan_allowed = 0;
return 0;
}
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