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// SPDX-License-Identifier: MIT
/*
* Copyright © 2023 Intel Corporation
*/
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_atomic_uapi.h>
#include "i915_drv.h"
#include "intel_atomic.h"
#include "intel_crtc.h"
#include "intel_display_types.h"
#include "intel_load_detect.h"
/* VESA 640x480x72Hz mode to set on the pipe */
static const struct drm_display_mode load_detect_mode = {
DRM_MODE("640x480", DRM_MODE_TYPE_DEFAULT, 31500, 640, 664,
704, 832, 0, 480, 489, 491, 520, 0, DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC),
};
static int intel_modeset_disable_planes(struct drm_atomic_state *state,
struct drm_crtc *crtc)
{
struct drm_plane *plane;
struct drm_plane_state *plane_state;
int ret, i;
ret = drm_atomic_add_affected_planes(state, crtc);
if (ret)
return ret;
for_each_new_plane_in_state(state, plane, plane_state, i) {
if (plane_state->crtc != crtc)
continue;
ret = drm_atomic_set_crtc_for_plane(plane_state, NULL);
if (ret)
return ret;
drm_atomic_set_fb_for_plane(plane_state, NULL);
}
return 0;
}
struct drm_atomic_state *
intel_load_detect_get_pipe(struct drm_connector *connector,
struct drm_modeset_acquire_ctx *ctx)
{
struct intel_encoder *encoder =
intel_attached_encoder(to_intel_connector(connector));
struct intel_crtc *possible_crtc;
struct intel_crtc *crtc = NULL;
struct drm_device *dev = encoder->base.dev;
struct drm_i915_private *dev_priv = to_i915(dev);
struct drm_mode_config *config = &dev->mode_config;
struct drm_atomic_state *state = NULL, *restore_state = NULL;
struct drm_connector_state *connector_state;
struct intel_crtc_state *crtc_state;
int ret;
drm_dbg_kms(&dev_priv->drm, "[CONNECTOR:%d:%s], [ENCODER:%d:%s]\n",
connector->base.id, connector->name,
encoder->base.base.id, encoder->base.name);
drm_WARN_ON(dev, !drm_modeset_is_locked(&config->connection_mutex));
/*
* Algorithm gets a little messy:
*
* - if the connector already has an assigned crtc, use it (but make
* sure it's on first)
*
* - try to find the first unused crtc that can drive this connector,
* and use that if we find one
*/
/* See if we already have a CRTC for this connector */
if (connector->state->crtc) {
crtc = to_intel_crtc(connector->state->crtc);
ret = drm_modeset_lock(&crtc->base.mutex, ctx);
if (ret)
goto fail;
/* Make sure the crtc and connector are running */
goto found;
}
/* Find an unused one (if possible) */
for_each_intel_crtc(dev, possible_crtc) {
if (!(encoder->base.possible_crtcs &
drm_crtc_mask(&possible_crtc->base)))
continue;
ret = drm_modeset_lock(&possible_crtc->base.mutex, ctx);
if (ret)
goto fail;
if (possible_crtc->base.state->enable) {
drm_modeset_unlock(&possible_crtc->base.mutex);
continue;
}
crtc = possible_crtc;
break;
}
/*
* If we didn't find an unused CRTC, don't use any.
*/
if (!crtc) {
drm_dbg_kms(&dev_priv->drm,
"no pipe available for load-detect\n");
ret = -ENODEV;
goto fail;
}
found:
state = drm_atomic_state_alloc(dev);
restore_state = drm_atomic_state_alloc(dev);
if (!state || !restore_state) {
ret = -ENOMEM;
goto fail;
}
state->acquire_ctx = ctx;
to_intel_atomic_state(state)->internal = true;
restore_state->acquire_ctx = ctx;
to_intel_atomic_state(restore_state)->internal = true;
connector_state = drm_atomic_get_connector_state(state, connector);
if (IS_ERR(connector_state)) {
ret = PTR_ERR(connector_state);
goto fail;
}
ret = drm_atomic_set_crtc_for_connector(connector_state, &crtc->base);
if (ret)
goto fail;
crtc_state = intel_atomic_get_crtc_state(state, crtc);
if (IS_ERR(crtc_state)) {
ret = PTR_ERR(crtc_state);
goto fail;
}
crtc_state->uapi.active = true;
ret = drm_atomic_set_mode_for_crtc(&crtc_state->uapi,
&load_detect_mode);
if (ret)
goto fail;
ret = intel_modeset_disable_planes(state, &crtc->base);
if (ret)
goto fail;
ret = PTR_ERR_OR_ZERO(drm_atomic_get_connector_state(restore_state, connector));
if (!ret)
ret = PTR_ERR_OR_ZERO(drm_atomic_get_crtc_state(restore_state, &crtc->base));
if (!ret)
ret = drm_atomic_add_affected_planes(restore_state, &crtc->base);
if (ret) {
drm_dbg_kms(&dev_priv->drm,
"Failed to create a copy of old state to restore: %i\n",
ret);
goto fail;
}
ret = drm_atomic_commit(state);
if (ret) {
drm_dbg_kms(&dev_priv->drm,
"failed to set mode on load-detect pipe\n");
goto fail;
}
drm_atomic_state_put(state);
/* let the connector get through one full cycle before testing */
intel_crtc_wait_for_next_vblank(crtc);
return restore_state;
fail:
if (state) {
drm_atomic_state_put(state);
state = NULL;
}
if (restore_state) {
drm_atomic_state_put(restore_state);
restore_state = NULL;
}
if (ret == -EDEADLK)
return ERR_PTR(ret);
return NULL;
}
void intel_load_detect_release_pipe(struct drm_connector *connector,
struct drm_atomic_state *state,
struct drm_modeset_acquire_ctx *ctx)
{
struct intel_encoder *intel_encoder =
intel_attached_encoder(to_intel_connector(connector));
struct drm_i915_private *i915 = to_i915(intel_encoder->base.dev);
struct drm_encoder *encoder = &intel_encoder->base;
int ret;
drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s], [ENCODER:%d:%s]\n",
connector->base.id, connector->name,
encoder->base.id, encoder->name);
if (IS_ERR_OR_NULL(state))
return;
ret = drm_atomic_helper_commit_duplicated_state(state, ctx);
if (ret)
drm_dbg_kms(&i915->drm,
"Couldn't release load detect pipe: %i\n", ret);
drm_atomic_state_put(state);
}
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