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// SPDX-License-Identifier: MIT
/* Copyright © 2025 Intel Corporation */
#include <drm/drm_print.h>
#include <drm/intel/display_parent_interface.h>
#include "intel_display_core.h"
#include "intel_display_types.h"
#include "intel_fb.h"
#include "intel_frontbuffer.h"
#include "intel_initial_plane.h"
#include "intel_plane.h"
void intel_initial_plane_vblank_wait(struct intel_crtc *crtc)
{
struct intel_display *display = to_intel_display(crtc);
display->parent->initial_plane->vblank_wait(&crtc->base);
}
static const struct intel_plane_state *
intel_reuse_initial_plane_obj(struct intel_crtc *this,
const struct intel_initial_plane_config plane_configs[])
{
struct intel_display *display = to_intel_display(this);
struct intel_crtc *crtc;
for_each_intel_crtc(display->drm, crtc) {
struct intel_plane *plane =
to_intel_plane(crtc->base.primary);
const struct intel_plane_state *plane_state =
to_intel_plane_state(plane->base.state);
const struct intel_crtc_state *crtc_state =
to_intel_crtc_state(crtc->base.state);
if (!crtc_state->hw.active)
continue;
if (!plane_state->ggtt_vma)
continue;
if (plane_configs[this->pipe].base == plane_configs[crtc->pipe].base)
return plane_state;
}
return NULL;
}
static struct drm_gem_object *
intel_alloc_initial_plane_obj(struct intel_display *display,
struct intel_initial_plane_config *plane_config)
{
struct intel_framebuffer *fb = plane_config->fb;
switch (fb->base.modifier) {
case DRM_FORMAT_MOD_LINEAR:
case I915_FORMAT_MOD_X_TILED:
case I915_FORMAT_MOD_Y_TILED:
case I915_FORMAT_MOD_4_TILED:
break;
default:
drm_dbg_kms(display->drm, "Unsupported modifier for initial FB: 0x%llx\n",
fb->base.modifier);
return NULL;
}
return display->parent->initial_plane->alloc_obj(display->drm, plane_config);
}
static void
intel_find_initial_plane_obj(struct intel_crtc *crtc,
struct intel_initial_plane_config plane_configs[])
{
struct intel_display *display = to_intel_display(crtc);
struct intel_initial_plane_config *plane_config = &plane_configs[crtc->pipe];
struct intel_plane *plane = to_intel_plane(crtc->base.primary);
struct intel_plane_state *plane_state = to_intel_plane_state(plane->base.state);
struct drm_framebuffer *fb;
struct i915_vma *vma;
int ret;
/*
* TODO:
* Disable planes if get_initial_plane_config() failed.
* Make sure things work if the surface base is not page aligned.
*/
if (!plane_config->fb)
return;
if (intel_alloc_initial_plane_obj(display, plane_config)) {
fb = &plane_config->fb->base;
vma = plane_config->vma;
} else {
const struct intel_plane_state *other_plane_state;
other_plane_state = intel_reuse_initial_plane_obj(crtc, plane_configs);
if (!other_plane_state)
goto nofb;
fb = other_plane_state->hw.fb;
vma = other_plane_state->ggtt_vma;
}
plane_state->uapi.rotation = plane_config->rotation;
intel_fb_fill_view(to_intel_framebuffer(fb),
plane_state->uapi.rotation, &plane_state->view);
ret = display->parent->initial_plane->setup(plane->base.state, plane_config, fb, vma);
if (ret)
goto nofb;
plane_state->uapi.src_x = 0;
plane_state->uapi.src_y = 0;
plane_state->uapi.src_w = fb->width << 16;
plane_state->uapi.src_h = fb->height << 16;
plane_state->uapi.crtc_x = 0;
plane_state->uapi.crtc_y = 0;
plane_state->uapi.crtc_w = fb->width;
plane_state->uapi.crtc_h = fb->height;
plane_state->uapi.fb = fb;
drm_framebuffer_get(fb);
plane_state->uapi.crtc = &crtc->base;
intel_plane_copy_uapi_to_hw_state(plane_state, plane_state, crtc);
atomic_or(plane->frontbuffer_bit, &to_intel_frontbuffer(fb)->bits);
return;
nofb:
/*
* We've failed to reconstruct the BIOS FB. Current display state
* indicates that the primary plane is visible, but has a NULL FB,
* which will lead to problems later if we don't fix it up. The
* simplest solution is to just disable the primary plane now and
* pretend the BIOS never had it enabled.
*/
intel_plane_disable_noatomic(crtc, plane);
}
static void plane_config_fini(struct intel_display *display,
struct intel_initial_plane_config *plane_config)
{
if (plane_config->fb) {
struct drm_framebuffer *fb = &plane_config->fb->base;
/* We may only have the stub and not a full framebuffer */
if (drm_framebuffer_read_refcount(fb))
drm_framebuffer_put(fb);
else
kfree(fb);
}
display->parent->initial_plane->config_fini(plane_config);
}
void intel_initial_plane_config(struct intel_display *display)
{
struct intel_initial_plane_config plane_configs[I915_MAX_PIPES] = {};
struct intel_crtc *crtc;
for_each_intel_crtc(display->drm, crtc) {
const struct intel_crtc_state *crtc_state =
to_intel_crtc_state(crtc->base.state);
struct intel_initial_plane_config *plane_config =
&plane_configs[crtc->pipe];
if (!crtc_state->hw.active)
continue;
/*
* Note that reserving the BIOS fb up front prevents us
* from stuffing other stolen allocations like the ring
* on top. This prevents some ugliness at boot time, and
* can even allow for smooth boot transitions if the BIOS
* fb is large enough for the active pipe configuration.
*/
display->funcs.display->get_initial_plane_config(crtc, plane_config);
/*
* If the fb is shared between multiple heads, we'll
* just get the first one.
*/
intel_find_initial_plane_obj(crtc, plane_configs);
if (display->funcs.display->fixup_initial_plane_config(crtc, plane_config))
intel_initial_plane_vblank_wait(crtc);
plane_config_fini(display, plane_config);
}
}
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