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// SPDX-License-Identifier: GPL-2.0+
#include <linux/dma-buf-map.h>
#include <drm/drm_atomic.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_writeback.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_gem_shmem_helper.h>
#include "vkms_drv.h"
static const u32 vkms_wb_formats[] = {
DRM_FORMAT_XRGB8888,
};
static const struct drm_connector_funcs vkms_wb_connector_funcs = {
.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 int vkms_wb_encoder_atomic_check(struct drm_encoder *encoder,
struct drm_crtc_state *crtc_state,
struct drm_connector_state *conn_state)
{
struct drm_framebuffer *fb;
const struct drm_display_mode *mode = &crtc_state->mode;
if (!conn_state->writeback_job || !conn_state->writeback_job->fb)
return 0;
fb = conn_state->writeback_job->fb;
if (fb->width != mode->hdisplay || fb->height != mode->vdisplay) {
DRM_DEBUG_KMS("Invalid framebuffer size %ux%u\n",
fb->width, fb->height);
return -EINVAL;
}
if (fb->format->format != vkms_wb_formats[0]) {
DRM_DEBUG_KMS("Invalid pixel format %p4cc\n",
&fb->format->format);
return -EINVAL;
}
return 0;
}
static const struct drm_encoder_helper_funcs vkms_wb_encoder_helper_funcs = {
.atomic_check = vkms_wb_encoder_atomic_check,
};
static int vkms_wb_connector_get_modes(struct drm_connector *connector)
{
struct drm_device *dev = connector->dev;
return drm_add_modes_noedid(connector, dev->mode_config.max_width,
dev->mode_config.max_height);
}
static int vkms_wb_prepare_job(struct drm_writeback_connector *wb_connector,
struct drm_writeback_job *job)
{
struct vkms_writeback_job *vkmsjob;
int ret;
if (!job->fb)
return 0;
vkmsjob = kzalloc(sizeof(*vkmsjob), GFP_KERNEL);
if (!vkmsjob)
return -ENOMEM;
ret = drm_gem_fb_vmap(job->fb, vkmsjob->map, vkmsjob->data);
if (ret) {
DRM_ERROR("vmap failed: %d\n", ret);
goto err_kfree;
}
job->priv = vkmsjob;
return 0;
err_kfree:
kfree(vkmsjob);
return ret;
}
static void vkms_wb_cleanup_job(struct drm_writeback_connector *connector,
struct drm_writeback_job *job)
{
struct vkms_writeback_job *vkmsjob = job->priv;
struct vkms_device *vkmsdev;
if (!job->fb)
return;
drm_gem_fb_vunmap(job->fb, vkmsjob->map);
vkmsdev = drm_device_to_vkms_device(job->fb->dev);
vkms_set_composer(&vkmsdev->output, false);
kfree(vkmsjob);
}
static void vkms_wb_atomic_commit(struct drm_connector *conn,
struct drm_atomic_state *state)
{
struct drm_connector_state *connector_state = drm_atomic_get_new_connector_state(state,
conn);
struct vkms_device *vkmsdev = drm_device_to_vkms_device(conn->dev);
struct vkms_output *output = &vkmsdev->output;
struct drm_writeback_connector *wb_conn = &output->wb_connector;
struct drm_connector_state *conn_state = wb_conn->base.state;
struct vkms_crtc_state *crtc_state = output->composer_state;
if (!conn_state)
return;
vkms_set_composer(&vkmsdev->output, true);
spin_lock_irq(&output->composer_lock);
crtc_state->active_writeback = conn_state->writeback_job->priv;
crtc_state->wb_pending = true;
spin_unlock_irq(&output->composer_lock);
drm_writeback_queue_job(wb_conn, connector_state);
}
static const struct drm_connector_helper_funcs vkms_wb_conn_helper_funcs = {
.get_modes = vkms_wb_connector_get_modes,
.prepare_writeback_job = vkms_wb_prepare_job,
.cleanup_writeback_job = vkms_wb_cleanup_job,
.atomic_commit = vkms_wb_atomic_commit,
};
int vkms_enable_writeback_connector(struct vkms_device *vkmsdev)
{
struct drm_writeback_connector *wb = &vkmsdev->output.wb_connector;
vkmsdev->output.wb_connector.encoder.possible_crtcs = 1;
drm_connector_helper_add(&wb->base, &vkms_wb_conn_helper_funcs);
return drm_writeback_connector_init(&vkmsdev->drm, wb,
&vkms_wb_connector_funcs,
&vkms_wb_encoder_helper_funcs,
vkms_wb_formats,
ARRAY_SIZE(vkms_wb_formats));
}
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