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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2017-2020, The Linux Foundation. All rights reserved.
*/
#include <drm/drm_atomic_helper.h>
#include <drm/drm_atomic.h>
#include <drm/drm_bridge.h>
#include <drm/drm_bridge_connector.h>
#include <drm/drm_crtc.h>
#include "msm_drv.h"
#include "msm_kms.h"
#include "dp_drm.h"
/**
* dp_bridge_detect - callback to determine if connector is connected
* @bridge: Pointer to drm bridge structure
* Returns: Bridge's 'is connected' status
*/
static enum drm_connector_status dp_bridge_detect(struct drm_bridge *bridge)
{
struct msm_dp *dp;
dp = to_dp_bridge(bridge)->dp_display;
drm_dbg_dp(dp->drm_dev, "is_connected = %s\n",
(dp->is_connected) ? "true" : "false");
return (dp->is_connected) ? connector_status_connected :
connector_status_disconnected;
}
static int dp_bridge_atomic_check(struct drm_bridge *bridge,
struct drm_bridge_state *bridge_state,
struct drm_crtc_state *crtc_state,
struct drm_connector_state *conn_state)
{
struct msm_dp *dp;
dp = to_dp_bridge(bridge)->dp_display;
drm_dbg_dp(dp->drm_dev, "is_connected = %s\n",
(dp->is_connected) ? "true" : "false");
/*
* There is no protection in the DRM framework to check if the display
* pipeline has been already disabled before trying to disable it again.
* Hence if the sink is unplugged, the pipeline gets disabled, but the
* crtc->active is still true. Any attempt to set the mode or manually
* disable this encoder will result in the crash.
*
* TODO: add support for telling the DRM subsystem that the pipeline is
* disabled by the hardware and thus all access to it should be forbidden.
* After that this piece of code can be removed.
*/
if (bridge->ops & DRM_BRIDGE_OP_HPD)
return (dp->is_connected) ? 0 : -ENOTCONN;
return 0;
}
/**
* dp_bridge_get_modes - callback to add drm modes via drm_mode_probed_add()
* @bridge: Poiner to drm bridge
* @connector: Pointer to drm connector structure
* Returns: Number of modes added
*/
static int dp_bridge_get_modes(struct drm_bridge *bridge, struct drm_connector *connector)
{
int rc = 0;
struct msm_dp *dp;
if (!connector)
return 0;
dp = to_dp_bridge(bridge)->dp_display;
/* pluggable case assumes EDID is read when HPD */
if (dp->is_connected) {
rc = dp_display_get_modes(dp);
if (rc <= 0) {
DRM_ERROR("failed to get DP sink modes, rc=%d\n", rc);
return rc;
}
} else {
drm_dbg_dp(connector->dev, "No sink connected\n");
}
return rc;
}
static const struct drm_bridge_funcs dp_bridge_ops = {
.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
.atomic_reset = drm_atomic_helper_bridge_reset,
.enable = dp_bridge_enable,
.disable = dp_bridge_disable,
.post_disable = dp_bridge_post_disable,
.mode_set = dp_bridge_mode_set,
.mode_valid = dp_bridge_mode_valid,
.get_modes = dp_bridge_get_modes,
.detect = dp_bridge_detect,
.atomic_check = dp_bridge_atomic_check,
};
struct drm_bridge *dp_bridge_init(struct msm_dp *dp_display, struct drm_device *dev,
struct drm_encoder *encoder)
{
int rc;
struct msm_dp_bridge *dp_bridge;
struct drm_bridge *bridge;
dp_bridge = devm_kzalloc(dev->dev, sizeof(*dp_bridge), GFP_KERNEL);
if (!dp_bridge)
return ERR_PTR(-ENOMEM);
dp_bridge->dp_display = dp_display;
bridge = &dp_bridge->bridge;
bridge->funcs = &dp_bridge_ops;
bridge->type = dp_display->connector_type;
/*
* Many ops only make sense for DP. Why?
* - Detect/HPD are used by DRM to know if a display is _physically_
* there, not whether the display is powered on / finished initting.
* On eDP we assume the display is always there because you can't
* know until power is applied. If we don't implement the ops DRM will
* assume our display is always there.
* - Currently eDP mode reading is driven by the panel driver. This
* allows the panel driver to properly power itself on to read the
* modes.
*/
if (!dp_display->is_edp) {
bridge->ops =
DRM_BRIDGE_OP_DETECT |
DRM_BRIDGE_OP_HPD |
DRM_BRIDGE_OP_MODES;
}
drm_bridge_add(bridge);
rc = drm_bridge_attach(encoder, bridge, NULL, DRM_BRIDGE_ATTACH_NO_CONNECTOR);
if (rc) {
DRM_ERROR("failed to attach bridge, rc=%d\n", rc);
drm_bridge_remove(bridge);
return ERR_PTR(rc);
}
if (dp_display->next_bridge) {
rc = drm_bridge_attach(encoder,
dp_display->next_bridge, bridge,
DRM_BRIDGE_ATTACH_NO_CONNECTOR);
if (rc < 0) {
DRM_ERROR("failed to attach panel bridge: %d\n", rc);
drm_bridge_remove(bridge);
return ERR_PTR(rc);
}
}
return bridge;
}
/* connector initialization */
struct drm_connector *dp_drm_connector_init(struct msm_dp *dp_display, struct drm_encoder *encoder)
{
struct drm_connector *connector = NULL;
connector = drm_bridge_connector_init(dp_display->drm_dev, encoder);
if (IS_ERR(connector))
return connector;
drm_connector_attach_encoder(connector, encoder);
return connector;
}
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