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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_crtc.h>
#include "msm_drv.h"
#include "msm_kms.h"
#include "dp_drm.h"
struct msm_dp_bridge {
struct drm_bridge bridge;
struct msm_dp *dp_display;
};
#define to_dp_display(x) container_of((x), struct msm_dp_bridge, bridge)
struct dp_connector {
struct drm_connector base;
struct msm_dp *dp_display;
};
#define to_dp_connector(x) container_of(x, struct dp_connector, base)
/**
* dp_connector_detect - callback to determine if connector is connected
* @conn: Pointer to drm connector structure
* @force: Force detect setting from drm framework
* Returns: Connector 'is connected' status
*/
static enum drm_connector_status dp_connector_detect(struct drm_connector *conn,
bool force)
{
struct msm_dp *dp;
dp = to_dp_connector(conn)->dp_display;
DRM_DEBUG_DP("is_connected = %s\n",
(dp->is_connected) ? "true" : "false");
return (dp->is_connected) ? connector_status_connected :
connector_status_disconnected;
}
/**
* dp_connector_get_modes - callback to add drm modes via drm_mode_probed_add()
* @connector: Pointer to drm connector structure
* Returns: Number of modes added
*/
static int dp_connector_get_modes(struct drm_connector *connector)
{
int rc = 0;
struct msm_dp *dp;
struct dp_display_mode *dp_mode = NULL;
struct drm_display_mode *m, drm_mode;
if (!connector)
return 0;
dp = to_dp_connector(connector)->dp_display;
dp_mode = kzalloc(sizeof(*dp_mode), GFP_KERNEL);
if (!dp_mode)
return 0;
/* pluggable case assumes EDID is read when HPD */
if (dp->is_connected) {
/*
*The get_modes() function might return one mode that is stored
* in dp_mode when compliance test is in progress. If not, the
* return value is equal to the total number of modes supported
* by the sink
*/
rc = dp_display_get_modes(dp, dp_mode);
if (rc <= 0) {
DRM_ERROR("failed to get DP sink modes, rc=%d\n", rc);
kfree(dp_mode);
return rc;
}
if (dp_mode->drm_mode.clock) { /* valid DP mode */
memset(&drm_mode, 0x0, sizeof(drm_mode));
drm_mode_copy(&drm_mode, &dp_mode->drm_mode);
m = drm_mode_duplicate(connector->dev, &drm_mode);
if (!m) {
DRM_ERROR("failed to add mode %ux%u\n",
drm_mode.hdisplay,
drm_mode.vdisplay);
kfree(dp_mode);
return 0;
}
drm_mode_probed_add(connector, m);
}
} else {
DRM_DEBUG_DP("No sink connected\n");
}
kfree(dp_mode);
return rc;
}
/**
* dp_connector_mode_valid - callback to determine if specified mode is valid
* @connector: Pointer to drm connector structure
* @mode: Pointer to drm mode structure
* Returns: Validity status for specified mode
*/
static enum drm_mode_status dp_connector_mode_valid(
struct drm_connector *connector,
struct drm_display_mode *mode)
{
struct msm_dp *dp_disp;
dp_disp = to_dp_connector(connector)->dp_display;
if ((dp_disp->max_pclk_khz <= 0) ||
(dp_disp->max_pclk_khz > DP_MAX_PIXEL_CLK_KHZ) ||
(mode->clock > dp_disp->max_pclk_khz))
return MODE_BAD;
return dp_display_validate_mode(dp_disp, mode->clock);
}
static const struct drm_connector_funcs dp_connector_funcs = {
.detect = dp_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 const struct drm_connector_helper_funcs dp_connector_helper_funcs = {
.get_modes = dp_connector_get_modes,
.mode_valid = dp_connector_mode_valid,
};
/* connector initialization */
struct drm_connector *dp_drm_connector_init(struct msm_dp *dp_display)
{
struct drm_connector *connector = NULL;
struct dp_connector *dp_connector;
int ret;
dp_connector = devm_kzalloc(dp_display->drm_dev->dev,
sizeof(*dp_connector),
GFP_KERNEL);
if (!dp_connector)
return ERR_PTR(-ENOMEM);
dp_connector->dp_display = dp_display;
connector = &dp_connector->base;
ret = drm_connector_init(dp_display->drm_dev, connector,
&dp_connector_funcs,
dp_display->connector_type);
if (ret)
return ERR_PTR(ret);
drm_connector_helper_add(connector, &dp_connector_helper_funcs);
/*
* Enable HPD to let hpd event is handled when cable is connected.
*/
connector->polled = DRM_CONNECTOR_POLL_HPD;
drm_connector_attach_encoder(connector, dp_display->encoder);
return connector;
}
static void dp_bridge_mode_set(struct drm_bridge *drm_bridge,
const struct drm_display_mode *mode,
const struct drm_display_mode *adjusted_mode)
{
struct msm_dp_bridge *dp_bridge = to_dp_display(drm_bridge);
struct msm_dp *dp_display = dp_bridge->dp_display;
msm_dp_display_mode_set(dp_display, drm_bridge->encoder, mode, adjusted_mode);
}
static void dp_bridge_enable(struct drm_bridge *drm_bridge)
{
struct msm_dp_bridge *dp_bridge = to_dp_display(drm_bridge);
struct msm_dp *dp_display = dp_bridge->dp_display;
msm_dp_display_enable(dp_display, drm_bridge->encoder);
}
static void dp_bridge_disable(struct drm_bridge *drm_bridge)
{
struct msm_dp_bridge *dp_bridge = to_dp_display(drm_bridge);
struct msm_dp *dp_display = dp_bridge->dp_display;
msm_dp_display_pre_disable(dp_display, drm_bridge->encoder);
}
static void dp_bridge_post_disable(struct drm_bridge *drm_bridge)
{
struct msm_dp_bridge *dp_bridge = to_dp_display(drm_bridge);
struct msm_dp *dp_display = dp_bridge->dp_display;
msm_dp_display_disable(dp_display, drm_bridge->encoder);
}
static const struct drm_bridge_funcs dp_bridge_ops = {
.enable = dp_bridge_enable,
.disable = dp_bridge_disable,
.post_disable = dp_bridge_post_disable,
.mode_set = dp_bridge_mode_set,
};
struct drm_bridge *msm_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->encoder = encoder;
rc = drm_bridge_attach(encoder, bridge, NULL, DRM_BRIDGE_ATTACH_NO_CONNECTOR);
if (rc) {
DRM_ERROR("failed to attach bridge, rc=%d\n", rc);
return ERR_PTR(rc);
}
if (dp_display->next_bridge) {
rc = drm_bridge_attach(dp_display->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;
}
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