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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2026 Institute of Software, Chinese Academy of Sciences (ISCAS)
*
* Authors:
* Icenowy Zheng <zhengxingda@iscas.ac.cn>
*/
#include <linux/log2.h>
#include <linux/regmap.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_gem_atomic_helper.h>
#include <drm/drm_modeset_helper_vtables.h>
#include <drm/drm_plane.h>
#include <drm/drm_print.h>
#include "vs_crtc.h"
#include "vs_plane.h"
#include "vs_dc.h"
#include "vs_hwdb.h"
#include "vs_cursor_plane_regs.h"
#define VSDC_MIN_CURSOR_SIZE 32
#define VSDC_MAX_CURSOR_SIZE 256
#define VSDC_CURSOR_LOCATION_MAX_POSITIVE BIT_MASK(15)
#define VSDC_CURSOR_LOCATION_MAX_NEGATIVE BIT_MASK(5)
static bool vs_cursor_plane_check_coord(int32_t coord)
{
if (coord >= 0)
return coord <= VSDC_CURSOR_LOCATION_MAX_POSITIVE;
else
return (-coord) <= VSDC_CURSOR_LOCATION_MAX_NEGATIVE;
}
static int vs_cursor_plane_atomic_check(struct drm_plane *plane,
struct drm_atomic_commit *state)
{
struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state,
plane);
struct drm_crtc *crtc = new_plane_state->crtc;
struct drm_framebuffer *fb = new_plane_state->fb;
struct drm_crtc_state *crtc_state = NULL;
struct vs_crtc *vcrtc;
struct vs_dc *dc;
int ret;
if (crtc)
crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
ret = drm_atomic_helper_check_plane_state(new_plane_state,
crtc_state,
DRM_PLANE_NO_SCALING,
DRM_PLANE_NO_SCALING,
true, true);
if (ret)
return ret;
if (!new_plane_state->visible)
return 0; /* Skip validity check */
vcrtc = drm_crtc_to_vs_crtc(crtc);
dc = vcrtc->dc;
/* Only certain PoT square sizes is supported. */
if (!is_power_of_2(new_plane_state->crtc_w) ||
new_plane_state->crtc_w < VSDC_MIN_CURSOR_SIZE ||
new_plane_state->crtc_w > dc->identity.max_cursor_size)
return -EINVAL;
if (new_plane_state->crtc_w != new_plane_state->crtc_h)
return -EINVAL;
/* Check if the cursor is inside the register fields' range */
if (!vs_cursor_plane_check_coord(new_plane_state->crtc_x) ||
!vs_cursor_plane_check_coord(new_plane_state->crtc_y))
return -EINVAL;
/* Extra line padding isn't supported */
if (fb->pitches[0] !=
drm_format_info_min_pitch(fb->format, 0, new_plane_state->crtc_w))
return -EINVAL;
return 0;
}
static void vs_cursor_plane_commit(struct vs_dc *dc, unsigned int output)
{
regmap_set_bits(dc->regs, VSDC_CURSOR_CONFIG(output),
VSDC_CURSOR_CONFIG_COMMIT |
VSDC_CURSOR_CONFIG_IMG_UPDATE);
}
static void vs_cursor_plane_atomic_enable(struct drm_plane *plane,
struct drm_atomic_commit *atomic_state)
{
struct drm_plane_state *state = drm_atomic_get_new_plane_state(atomic_state,
plane);
struct drm_crtc *crtc = state->crtc;
struct vs_crtc *vcrtc = drm_crtc_to_vs_crtc(crtc);
unsigned int output = vcrtc->id;
struct vs_dc *dc = vcrtc->dc;
regmap_update_bits(dc->regs, VSDC_CURSOR_CONFIG(output),
VSDC_CURSOR_CONFIG_FMT_MASK,
VSDC_CURSOR_CONFIG_FMT_ARGB8888);
vs_cursor_plane_commit(dc, output);
}
static void vs_cursor_plane_atomic_disable(struct drm_plane *plane,
struct drm_atomic_commit *atomic_state)
{
struct drm_plane_state *state = drm_atomic_get_old_plane_state(atomic_state,
plane);
struct drm_crtc *crtc = state->crtc;
struct vs_crtc *vcrtc = drm_crtc_to_vs_crtc(crtc);
unsigned int output = vcrtc->id;
struct vs_dc *dc = vcrtc->dc;
regmap_update_bits(dc->regs, VSDC_CURSOR_CONFIG(output),
VSDC_CURSOR_CONFIG_FMT_MASK,
VSDC_CURSOR_CONFIG_FMT_OFF);
vs_cursor_plane_commit(dc, output);
}
static void vs_cursor_plane_atomic_update(struct drm_plane *plane,
struct drm_atomic_commit *atomic_state)
{
struct drm_plane_state *state = drm_atomic_get_new_plane_state(atomic_state,
plane);
struct drm_framebuffer *fb = state->fb;
struct drm_crtc *crtc = state->crtc;
struct vs_dc *dc;
struct vs_crtc *vcrtc;
unsigned int output;
dma_addr_t dma_addr;
if (!state->visible) {
vs_cursor_plane_atomic_disable(plane, atomic_state);
return;
}
vcrtc = drm_crtc_to_vs_crtc(crtc);
output = vcrtc->id;
dc = vcrtc->dc;
/* Other sizes should be rejected by atomic_check */
switch (state->crtc_w) {
case 32:
regmap_update_bits(dc->regs, VSDC_CURSOR_CONFIG(output),
VSDC_CURSOR_CONFIG_SIZE_MASK,
VSDC_CURSOR_CONFIG_SIZE_32);
break;
case 64:
regmap_update_bits(dc->regs, VSDC_CURSOR_CONFIG(output),
VSDC_CURSOR_CONFIG_SIZE_MASK,
VSDC_CURSOR_CONFIG_SIZE_64);
break;
case 128:
regmap_update_bits(dc->regs, VSDC_CURSOR_CONFIG(output),
VSDC_CURSOR_CONFIG_SIZE_MASK,
VSDC_CURSOR_CONFIG_SIZE_128);
break;
case 256:
regmap_update_bits(dc->regs, VSDC_CURSOR_CONFIG(output),
VSDC_CURSOR_CONFIG_SIZE_MASK,
VSDC_CURSOR_CONFIG_SIZE_256);
break;
}
dma_addr = vs_fb_get_dma_addr(fb, &state->src);
regmap_write(dc->regs, VSDC_CURSOR_ADDRESS(output),
lower_32_bits(dma_addr));
/*
* The X_OFF and Y_OFF fields define which point does the LOCATION
* register represent in the cursor image, and LOCATION register
* values are unsigned. To for positive left-top coordinates the
* offset is set to 0 and the location is set to the coordinate, for
* negative coordinates the location is set to 0 and the offset
* is set to the opposite number of the coordinate to offset the
* cursor image partly off-screen.
*/
if (state->crtc_x >= 0) {
regmap_update_bits(dc->regs, VSDC_CURSOR_CONFIG(output),
VSDC_CURSOR_CONFIG_X_OFF_MASK, 0);
regmap_update_bits(dc->regs, VSDC_CURSOR_LOCATION(output),
VSDC_CURSOR_LOCATION_X_MASK,
VSDC_CURSOR_LOCATION_X(state->crtc_x));
} else {
regmap_update_bits(dc->regs, VSDC_CURSOR_CONFIG(output),
VSDC_CURSOR_CONFIG_X_OFF_MASK,
-state->crtc_x);
regmap_update_bits(dc->regs, VSDC_CURSOR_LOCATION(output),
VSDC_CURSOR_LOCATION_X_MASK, 0);
}
if (state->crtc_y >= 0) {
regmap_update_bits(dc->regs, VSDC_CURSOR_CONFIG(output),
VSDC_CURSOR_CONFIG_Y_OFF_MASK, 0);
regmap_update_bits(dc->regs, VSDC_CURSOR_LOCATION(output),
VSDC_CURSOR_LOCATION_Y_MASK,
VSDC_CURSOR_LOCATION_Y(state->crtc_y));
} else {
regmap_update_bits(dc->regs, VSDC_CURSOR_CONFIG(output),
VSDC_CURSOR_CONFIG_Y_OFF_MASK,
-state->crtc_y);
regmap_update_bits(dc->regs, VSDC_CURSOR_LOCATION(output),
VSDC_CURSOR_LOCATION_Y_MASK, 0);
}
vs_cursor_plane_commit(dc, output);
}
static const struct drm_plane_helper_funcs vs_cursor_plane_helper_funcs = {
.atomic_check = vs_cursor_plane_atomic_check,
.atomic_update = vs_cursor_plane_atomic_update,
.atomic_enable = vs_cursor_plane_atomic_enable,
.atomic_disable = vs_cursor_plane_atomic_disable,
};
static const struct drm_plane_funcs vs_cursor_plane_funcs = {
.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
.disable_plane = drm_atomic_helper_disable_plane,
.reset = drm_atomic_helper_plane_reset,
.update_plane = drm_atomic_helper_update_plane,
};
static const u32 vs_cursor_plane_formats[] = {
DRM_FORMAT_ARGB8888,
};
static const u64 vs_cursor_plane_modifiers[] = {
DRM_FORMAT_MOD_LINEAR,
DRM_FORMAT_MOD_INVALID, /* sentinel */
};
struct drm_plane *vs_cursor_plane_init(struct drm_device *drm_dev,
struct vs_dc *dc)
{
int32_t max_cursor_size = dc->identity.max_cursor_size;
struct drm_plane *plane;
if (drm_WARN_ON_ONCE(drm_dev, max_cursor_size < VSDC_MIN_CURSOR_SIZE ||
max_cursor_size > VSDC_MAX_CURSOR_SIZE))
return ERR_PTR(-EINVAL);
plane = drmm_universal_plane_alloc(drm_dev, struct drm_plane, dev, 0,
&vs_cursor_plane_funcs,
vs_cursor_plane_formats,
ARRAY_SIZE(vs_cursor_plane_formats),
vs_cursor_plane_modifiers,
DRM_PLANE_TYPE_CURSOR,
NULL);
if (IS_ERR(plane))
return plane;
drm_plane_helper_add(plane, &vs_cursor_plane_helper_funcs);
return plane;
}
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