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// SPDX-License-Identifier: MIT
/* Copyright © 2025 Intel Corporation */
#include <linux/iopoll.h>
#include <drm/drm_blend.h>
#include <drm/drm_print.h>
#include <drm/intel/display_parent_interface.h>
#include "intel_crtc.h"
#include "intel_de.h"
#include "intel_display_core.h"
#include "intel_display_regs.h"
#include "intel_display_types.h"
#include "intel_fb.h"
#include "intel_frontbuffer.h"
#include "intel_initial_plane.h"
#include "intel_parent.h"
#include "intel_plane.h"
struct intel_initial_plane_configs {
struct intel_initial_plane_config config[I915_MAX_PIPES];
};
void intel_initial_plane_vblank_wait(struct intel_crtc *crtc)
{
struct intel_display *display = to_intel_display(crtc);
u32 start_ts, end_ts;
int ret;
/* xe doesn't have interrupts enabled this early */
if (intel_parent_irq_enabled(display)) {
intel_crtc_wait_for_next_vblank(crtc);
return;
}
start_ts = intel_de_read(display, PIPE_FRMTMSTMP(crtc->pipe));
ret = poll_timeout_us(end_ts = intel_de_read(display, PIPE_FRMTMSTMP(crtc->pipe)),
end_ts != start_ts, 1000, 1000 * 1000, false);
if (ret)
drm_warn(display->drm, "[CRTC:%d:%s] early vblank wait timed out\n",
crtc->base.base.id, crtc->base.name);
}
static const struct intel_plane_state *
intel_reuse_initial_plane_obj(struct intel_crtc *this,
const struct intel_initial_plane_configs *all_plane_configs)
{
struct intel_display *display = to_intel_display(this);
struct intel_crtc *crtc;
for_each_intel_crtc(display, 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 (all_plane_configs->config[this->pipe].base ==
all_plane_configs->config[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 drm_framebuffer *fb = plane_config->fb;
switch (fb->modifier) {
case DRM_FORMAT_MOD_LINEAR:
break;
case I915_FORMAT_MOD_X_TILED:
case I915_FORMAT_MOD_Y_TILED:
/* fenced region needed for linear CPU access to tiled FB */
if (intel_parent_has_fenced_regions(display))
break;
fallthrough;
default:
drm_dbg_kms(display->drm, "Unsupported modifier for initial FB: 0x%llx\n",
fb->modifier);
return NULL;
}
/*
* Would need to preserve the DPT, its GGTT
* mapping, and the actual FB memory.
*/
if (intel_fb_modifier_uses_dpt(display, fb->modifier)) {
drm_dbg_kms(display->drm, "DPT not supported for initial FB\n");
return NULL;
}
/*
* Would need to preserve the 270 degree rotated
* GGTT mapping used by the display hardware.
*/
if (drm_rotation_90_or_270(plane_config->rotation)) {
drm_dbg_kms(display->drm, "90/270 degree rotation not supported for initial FB\n");
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_configs *all_plane_configs)
{
struct intel_display *display = to_intel_display(crtc);
struct intel_initial_plane_config *plane_config = &all_plane_configs->config[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:
* Make sure things work if the surface base is not page aligned.
*/
if (!plane_config->fb)
goto nofb;
if (intel_alloc_initial_plane_obj(display, plane_config)) {
fb = plane_config->fb;
vma = plane_config->vma;
} else {
const struct intel_plane_state *other_plane_state;
other_plane_state = intel_reuse_initial_plane_obj(crtc, all_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(NULL, 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.
*/
if (plane_state->uapi.visible)
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;
/* 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_configs all_plane_configs = {};
struct intel_crtc *crtc;
for_each_intel_crtc(display, crtc) {
const struct intel_crtc_state *crtc_state =
to_intel_crtc_state(crtc->base.state);
struct intel_initial_plane_config *plane_config =
&all_plane_configs.config[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->modeset.funcs->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, &all_plane_configs);
if (display->modeset.funcs->fixup_initial_plane_config(crtc, plane_config))
intel_initial_plane_vblank_wait(crtc);
plane_config_fini(display, plane_config);
}
}
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