linuxdebug/drivers/gpu/drm/rcar-du/rcar_du_writeback.c

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2024-07-16 15:50:57 +02:00
// SPDX-License-Identifier: GPL-2.0
/*
* R-Car Display Unit Writeback Support
*
* Copyright (C) 2019 Laurent Pinchart <laurent.pinchart@ideasonboard.com>
*/
#include <drm/drm_atomic_helper.h>
#include <drm/drm_device.h>
#include <drm/drm_edid.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_writeback.h>
#include "rcar_du_crtc.h"
#include "rcar_du_drv.h"
#include "rcar_du_kms.h"
#include "rcar_du_writeback.h"
/**
* struct rcar_du_wb_conn_state - Driver-specific writeback connector state
* @state: base DRM connector state
* @format: format of the writeback framebuffer
*/
struct rcar_du_wb_conn_state {
struct drm_connector_state state;
const struct rcar_du_format_info *format;
};
#define to_rcar_wb_conn_state(s) \
container_of(s, struct rcar_du_wb_conn_state, state)
/**
* struct rcar_du_wb_job - Driver-private data for writeback jobs
* @sg_tables: scatter-gather tables for the framebuffer memory
*/
struct rcar_du_wb_job {
struct sg_table sg_tables[3];
};
static int rcar_du_wb_conn_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 rcar_du_wb_prepare_job(struct drm_writeback_connector *connector,
struct drm_writeback_job *job)
{
struct rcar_du_crtc *rcrtc = wb_to_rcar_crtc(connector);
struct rcar_du_wb_job *rjob;
int ret;
if (!job->fb)
return 0;
rjob = kzalloc(sizeof(*rjob), GFP_KERNEL);
if (!rjob)
return -ENOMEM;
/* Map the framebuffer to the VSP. */
ret = rcar_du_vsp_map_fb(rcrtc->vsp, job->fb, rjob->sg_tables);
if (ret < 0) {
kfree(rjob);
return ret;
}
job->priv = rjob;
return 0;
}
static void rcar_du_wb_cleanup_job(struct drm_writeback_connector *connector,
struct drm_writeback_job *job)
{
struct rcar_du_crtc *rcrtc = wb_to_rcar_crtc(connector);
struct rcar_du_wb_job *rjob = job->priv;
if (!job->fb)
return;
rcar_du_vsp_unmap_fb(rcrtc->vsp, job->fb, rjob->sg_tables);
kfree(rjob);
}
static const struct drm_connector_helper_funcs rcar_du_wb_conn_helper_funcs = {
.get_modes = rcar_du_wb_conn_get_modes,
.prepare_writeback_job = rcar_du_wb_prepare_job,
.cleanup_writeback_job = rcar_du_wb_cleanup_job,
};
static struct drm_connector_state *
rcar_du_wb_conn_duplicate_state(struct drm_connector *connector)
{
struct rcar_du_wb_conn_state *copy;
if (WARN_ON(!connector->state))
return NULL;
copy = kzalloc(sizeof(*copy), GFP_KERNEL);
if (!copy)
return NULL;
__drm_atomic_helper_connector_duplicate_state(connector, &copy->state);
return &copy->state;
}
static void rcar_du_wb_conn_destroy_state(struct drm_connector *connector,
struct drm_connector_state *state)
{
__drm_atomic_helper_connector_destroy_state(state);
kfree(to_rcar_wb_conn_state(state));
}
static void rcar_du_wb_conn_reset(struct drm_connector *connector)
{
struct rcar_du_wb_conn_state *state;
if (connector->state) {
rcar_du_wb_conn_destroy_state(connector, connector->state);
connector->state = NULL;
}
state = kzalloc(sizeof(*state), GFP_KERNEL);
if (state == NULL)
return;
__drm_atomic_helper_connector_reset(connector, &state->state);
}
static const struct drm_connector_funcs rcar_du_wb_conn_funcs = {
.reset = rcar_du_wb_conn_reset,
.fill_modes = drm_helper_probe_single_connector_modes,
.destroy = drm_connector_cleanup,
.atomic_duplicate_state = rcar_du_wb_conn_duplicate_state,
.atomic_destroy_state = rcar_du_wb_conn_destroy_state,
};
static int rcar_du_wb_enc_atomic_check(struct drm_encoder *encoder,
struct drm_crtc_state *crtc_state,
struct drm_connector_state *conn_state)
{
struct rcar_du_wb_conn_state *wb_state =
to_rcar_wb_conn_state(conn_state);
const struct drm_display_mode *mode = &crtc_state->mode;
struct drm_device *dev = encoder->dev;
struct drm_framebuffer *fb;
if (!conn_state->writeback_job)
return 0;
fb = conn_state->writeback_job->fb;
/*
* Verify that the framebuffer format is supported and that its size
* matches the current mode.
*/
if (fb->width != mode->hdisplay || fb->height != mode->vdisplay) {
dev_dbg(dev->dev, "%s: invalid framebuffer size %ux%u\n",
__func__, fb->width, fb->height);
return -EINVAL;
}
wb_state->format = rcar_du_format_info(fb->format->format);
if (wb_state->format == NULL) {
dev_dbg(dev->dev, "%s: unsupported format %p4cc\n", __func__,
&fb->format->format);
return -EINVAL;
}
return 0;
}
static const struct drm_encoder_helper_funcs rcar_du_wb_enc_helper_funcs = {
.atomic_check = rcar_du_wb_enc_atomic_check,
};
/*
* Only RGB formats are currently supported as the VSP outputs RGB to the DU
* and can't convert to YUV separately for writeback.
*/
static const u32 writeback_formats[] = {
DRM_FORMAT_RGB332,
DRM_FORMAT_ARGB4444,
DRM_FORMAT_XRGB4444,
DRM_FORMAT_ARGB1555,
DRM_FORMAT_XRGB1555,
DRM_FORMAT_RGB565,
DRM_FORMAT_BGR888,
DRM_FORMAT_RGB888,
DRM_FORMAT_BGRA8888,
DRM_FORMAT_BGRX8888,
DRM_FORMAT_ARGB8888,
DRM_FORMAT_XRGB8888,
};
int rcar_du_writeback_init(struct rcar_du_device *rcdu,
struct rcar_du_crtc *rcrtc)
{
struct drm_writeback_connector *wb_conn = &rcrtc->writeback;
drm_connector_helper_add(&wb_conn->base,
&rcar_du_wb_conn_helper_funcs);
return drm_writeback_connector_init(&rcdu->ddev, wb_conn,
&rcar_du_wb_conn_funcs,
&rcar_du_wb_enc_helper_funcs,
writeback_formats,
ARRAY_SIZE(writeback_formats),
1 << drm_crtc_index(&rcrtc->crtc));
}
void rcar_du_writeback_setup(struct rcar_du_crtc *rcrtc,
struct vsp1_du_writeback_config *cfg)
{
struct rcar_du_wb_conn_state *wb_state;
struct drm_connector_state *state;
struct rcar_du_wb_job *rjob;
struct drm_framebuffer *fb;
unsigned int i;
state = rcrtc->writeback.base.state;
if (!state || !state->writeback_job)
return;
fb = state->writeback_job->fb;
rjob = state->writeback_job->priv;
wb_state = to_rcar_wb_conn_state(state);
cfg->pixelformat = wb_state->format->v4l2;
cfg->pitch = fb->pitches[0];
for (i = 0; i < wb_state->format->planes; ++i)
cfg->mem[i] = sg_dma_address(rjob->sg_tables[i].sgl)
+ fb->offsets[i];
drm_writeback_queue_job(&rcrtc->writeback, state);
}
void rcar_du_writeback_complete(struct rcar_du_crtc *rcrtc)
{
drm_writeback_signal_completion(&rcrtc->writeback, 0);
}