#include <linux/io.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_simple_kms_helper.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_modes.h>
#include <drm/drm_drv.h>
#include <drm/drm_edid.h>
#include "hibmc_drm_drv.h"
#include "dp/dp_hw.h"
#include "dp/dp_comm.h"
#include "dp/dp_config.h"
#define DP_MASKED_SINK_HPD_PLUG_INT BIT(2)
static int hibmc_dp_connector_get_modes(struct drm_connector *connector)
{
const struct drm_edid *drm_edid;
int count;
drm_edid = drm_edid_read(connector);
drm_edid_connector_update(connector, drm_edid);
count = drm_edid_connector_add_modes(connector);
drm_edid_free(drm_edid);
return count;
}
static bool hibmc_dp_get_dpcd(struct hibmc_dp_dev *dp_dev)
{
int ret;
ret = drm_dp_read_dpcd_caps(dp_dev->aux, dp_dev->dpcd);
if (ret)
return false;
dp_dev->is_branch = drm_dp_is_branch(dp_dev->dpcd);
ret = drm_dp_read_desc(dp_dev->aux, &dp_dev->desc, dp_dev->is_branch);
if (ret)
return false;
ret = drm_dp_read_downstream_info(dp_dev->aux, dp_dev->dpcd, dp_dev->downstream_ports);
if (ret)
return false;
return true;
}
static int hibmc_dp_detect(struct drm_connector *connector,
struct drm_modeset_acquire_ctx *ctx, bool force)
{
struct hibmc_dp *dp = to_hibmc_dp(connector);
struct hibmc_dp_dev *dp_dev = dp->dp_dev;
int ret;
if (dp->irq_status) {
if (dp_dev->hpd_status != HIBMC_HPD_IN)
return connector_status_disconnected;
}
if (!hibmc_dp_get_dpcd(dp_dev))
return connector_status_disconnected;
if (!dp_dev->is_branch)
return connector_status_connected;
if (drm_dp_read_sink_count_cap(connector, dp_dev->dpcd, &dp_dev->desc) &&
dp_dev->downstream_ports[0] & DP_DS_PORT_HPD) {
ret = drm_dp_read_sink_count(dp_dev->aux);
if (ret > 0)
return connector_status_connected;
}
return connector_status_disconnected;
}
static int hibmc_dp_mode_valid(struct drm_connector *connector,
const struct drm_display_mode *mode,
struct drm_modeset_acquire_ctx *ctx,
enum drm_mode_status *status)
{
struct hibmc_dp *dp = to_hibmc_dp(connector);
u64 cur_val, max_val;
cur_val = (u64)mode->clock * HIBMC_DP_BPP;
max_val = (u64)hibmc_dp_get_link_rate(dp) * DP_MODE_VALI_CAL * hibmc_dp_get_lanes(dp);
*status = cur_val > max_val ? MODE_CLOCK_HIGH : MODE_OK;
return 0;
}
static const struct drm_connector_helper_funcs hibmc_dp_conn_helper_funcs = {
.get_modes = hibmc_dp_connector_get_modes,
.detect_ctx = hibmc_dp_detect,
.mode_valid_ctx = hibmc_dp_mode_valid,
};
static int hibmc_dp_late_register(struct drm_connector *connector)
{
struct hibmc_dp *dp = to_hibmc_dp(connector);
hibmc_dp_enable_int(dp);
return drm_dp_aux_register(&dp->aux);
}
static void hibmc_dp_early_unregister(struct drm_connector *connector)
{
struct hibmc_dp *dp = to_hibmc_dp(connector);
drm_dp_aux_unregister(&dp->aux);
hibmc_dp_disable_int(dp);
}
static const struct drm_connector_funcs hibmc_dp_conn_funcs = {
.reset = drm_atomic_helper_connector_reset,
.fill_modes = drm_helper_probe_single_connector_modes,
.destroy = drm_connector_cleanup,
.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
.late_register = hibmc_dp_late_register,
.early_unregister = hibmc_dp_early_unregister,
.debugfs_init = hibmc_debugfs_init,
};
static inline int hibmc_dp_prepare(struct hibmc_dp *dp, struct drm_display_mode *mode)
{
int ret;
hibmc_dp_display_en(dp, false);
ret = hibmc_dp_mode_set(dp, mode);
if (ret)
drm_err(dp->drm_dev, "hibmc dp mode set failed: %d\n", ret);
return ret;
}
static void hibmc_dp_encoder_enable(struct drm_encoder *drm_encoder,
struct drm_atomic_state *state)
{
struct hibmc_dp *dp = container_of(drm_encoder, struct hibmc_dp, encoder);
struct drm_display_mode *mode = &drm_encoder->crtc->state->mode;
if (hibmc_dp_prepare(dp, mode))
return;
hibmc_dp_display_en(dp, true);
}
static void hibmc_dp_encoder_disable(struct drm_encoder *drm_encoder,
struct drm_atomic_state *state)
{
struct hibmc_dp *dp = container_of(drm_encoder, struct hibmc_dp, encoder);
hibmc_dp_display_en(dp, false);
}
static const struct drm_encoder_helper_funcs hibmc_dp_encoder_helper_funcs = {
.atomic_enable = hibmc_dp_encoder_enable,
.atomic_disable = hibmc_dp_encoder_disable,
};
irqreturn_t hibmc_dp_hpd_isr(int irq, void *arg)
{
struct drm_device *dev = (struct drm_device *)arg;
struct hibmc_drm_private *priv = to_hibmc_drm_private(dev);
int idx, exp_status;
if (!drm_dev_enter(dev, &idx))
return -ENODEV;
if (priv->dp.irq_status & DP_MASKED_SINK_HPD_PLUG_INT) {
drm_dbg_dp(&priv->dev, "HPD IN isr occur!\n");
hibmc_dp_hpd_cfg(&priv->dp);
exp_status = HIBMC_HPD_IN;
} else {
drm_dbg_dp(&priv->dev, "HPD OUT isr occur!\n");
hibmc_dp_reset_link(&priv->dp);
exp_status = HIBMC_HPD_OUT;
}
if (hibmc_dp_check_hpd_status(&priv->dp, exp_status))
drm_connector_helper_hpd_irq_event(&priv->dp.connector);
drm_dev_exit(idx);
return IRQ_HANDLED;
}
int hibmc_dp_init(struct hibmc_drm_private *priv)
{
struct drm_device *dev = &priv->dev;
struct drm_crtc *crtc = &priv->crtc;
struct hibmc_dp *dp = &priv->dp;
struct drm_connector *connector = &dp->connector;
struct drm_encoder *encoder = &dp->encoder;
int ret;
dp->mmio = priv->mmio;
dp->drm_dev = dev;
ret = hibmc_dp_hw_init(&priv->dp);
if (ret) {
drm_err(dev, "hibmc dp hw init failed: %d\n", ret);
return ret;
}
hibmc_dp_display_en(&priv->dp, false);
encoder->possible_crtcs = drm_crtc_mask(crtc);
ret = drmm_encoder_init(dev, encoder, NULL, DRM_MODE_ENCODER_TMDS, NULL);
if (ret) {
drm_err(dev, "init dp encoder failed: %d\n", ret);
return ret;
}
drm_encoder_helper_add(encoder, &hibmc_dp_encoder_helper_funcs);
ret = drm_connector_init_with_ddc(dev, connector, &hibmc_dp_conn_funcs,
DRM_MODE_CONNECTOR_DisplayPort, &dp->aux.ddc);
if (ret) {
drm_err(dev, "init dp connector failed: %d\n", ret);
return ret;
}
drm_connector_helper_add(connector, &hibmc_dp_conn_helper_funcs);
drm_connector_attach_encoder(connector, encoder);
connector->polled = DRM_CONNECTOR_POLL_HPD;
return 0;
}
