Quellcode-Bibliothek mtk_plane.c   Sprache: unbekannt

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2015 MediaTek Inc.
 * Author: CK Hu <ck.hu@mediatek.com>
 */

#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_atomic_uapi.h>
#include <drm/drm_blend.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_gem_atomic_helper.h>
#include <linux/align.h>

#include "mtk_crtc.h"
#include "mtk_ddp_comp.h"
#include "mtk_drm_drv.h"
#include "mtk_gem.h"
#include "mtk_plane.h"

static const u64 modifiers[] = {
 DRM_FORMAT_MOD_LINEAR,
 DRM_FORMAT_MOD_INVALID,
};

static void mtk_plane_reset(struct drm_plane *plane)
{
 struct mtk_plane_state *state;

 if (plane->state) {
  __drm_atomic_helper_plane_destroy_state(plane->state);

  state = to_mtk_plane_state(plane->state);
  memset(state, 0, sizeof(*state));
 } else {
  state = kzalloc(sizeof(*state), GFP_KERNEL);
  if (!state)
   return;
 }

 __drm_atomic_helper_plane_reset(plane, &state->base);

 state->base.plane = plane;
 state->pending.format = DRM_FORMAT_RGB565;
 state->pending.modifier = DRM_FORMAT_MOD_LINEAR;
}

static struct drm_plane_state *mtk_plane_duplicate_state(struct drm_plane *plane)
{
 struct mtk_plane_state *old_state = to_mtk_plane_state(plane->state);
 struct mtk_plane_state *state;

 state = kmalloc(sizeof(*state), GFP_KERNEL);
 if (!state)
  return NULL;

 __drm_atomic_helper_plane_duplicate_state(plane, &state->base);

 WARN_ON(state->base.plane != plane);

 state->pending = old_state->pending;

 return &state->base;
}

static bool mtk_plane_format_mod_supported(struct drm_plane *plane,
        uint32_t format,
        uint64_t modifier)
{
 return modifier == DRM_FORMAT_MOD_LINEAR;
}

static void mtk_plane_destroy_state(struct drm_plane *plane,
        struct drm_plane_state *state)
{
 __drm_atomic_helper_plane_destroy_state(state);
 kfree(to_mtk_plane_state(state));
}

static int mtk_plane_atomic_async_check(struct drm_plane *plane,
     struct drm_atomic_state *state, bool flip)
{
 struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state,
           plane);
 struct drm_crtc_state *crtc_state;
 int ret;

 if (plane != new_plane_state->crtc->cursor)
  return -EINVAL;

 if (!plane->state)
  return -EINVAL;

 if (!plane->state->fb)
  return -EINVAL;

 ret = mtk_crtc_plane_check(new_plane_state->crtc, plane,
       to_mtk_plane_state(new_plane_state));
 if (ret)
  return ret;

 crtc_state = drm_atomic_get_existing_crtc_state(state, new_plane_state->crtc);

 return drm_atomic_helper_check_plane_state(plane->state, crtc_state,
         DRM_PLANE_NO_SCALING,
         DRM_PLANE_NO_SCALING,
         true, true);
}

static void mtk_plane_update_new_state(struct drm_plane_state *new_state,
           struct mtk_plane_state *mtk_plane_state)
{
 struct drm_framebuffer *fb = new_state->fb;
 struct drm_gem_object *gem;
 struct mtk_gem_obj *mtk_gem;
 unsigned int pitch, format;
 u64 modifier;
 dma_addr_t addr;
 dma_addr_t hdr_addr = 0;
 unsigned int hdr_pitch = 0;
 int offset;

 gem = fb->obj[0];
 mtk_gem = to_mtk_gem_obj(gem);
 addr = mtk_gem->dma_addr;
 pitch = fb->pitches[0];
 format = fb->format->format;
 modifier = fb->modifier;

 if (modifier == DRM_FORMAT_MOD_LINEAR) {
  /*
 * Using dma_addr_t variable to calculate with multiplier of different types,
 * for example: addr += (new_state->src.x1 >> 16) * fb->format->cpp[0];
 * may cause coverity issue with unintentional overflow.
 */
  offset = (new_state->src.x1 >> 16) * fb->format->cpp[0];
  addr += offset;
  offset = (new_state->src.y1 >> 16) * pitch;
  addr += offset;
 } else {
  int width_in_blocks = ALIGN(fb->width, AFBC_DATA_BLOCK_WIDTH)
          / AFBC_DATA_BLOCK_WIDTH;
  int height_in_blocks = ALIGN(fb->height, AFBC_DATA_BLOCK_HEIGHT)
           / AFBC_DATA_BLOCK_HEIGHT;
  int x_offset_in_blocks = (new_state->src.x1 >> 16) / AFBC_DATA_BLOCK_WIDTH;
  int y_offset_in_blocks = (new_state->src.y1 >> 16) / AFBC_DATA_BLOCK_HEIGHT;
  int hdr_size, hdr_offset;

  hdr_pitch = width_in_blocks * AFBC_HEADER_BLOCK_SIZE;
  pitch = width_in_blocks * AFBC_DATA_BLOCK_WIDTH *
   AFBC_DATA_BLOCK_HEIGHT * fb->format->cpp[0];

  hdr_size = ALIGN(hdr_pitch * height_in_blocks, AFBC_HEADER_ALIGNMENT);
  hdr_offset = hdr_pitch * y_offset_in_blocks +
   AFBC_HEADER_BLOCK_SIZE * x_offset_in_blocks;

  /*
 * Using dma_addr_t variable to calculate with multiplier of different types,
 * for example: addr += hdr_pitch * y_offset_in_blocks;
 * may cause coverity issue with unintentional overflow.
 */
  hdr_addr = addr + hdr_offset;

  /* The data plane is offset by 1 additional block. */
  offset = pitch * y_offset_in_blocks +
    AFBC_DATA_BLOCK_WIDTH * AFBC_DATA_BLOCK_HEIGHT *
    fb->format->cpp[0] * (x_offset_in_blocks + 1);

  /*
 * Using dma_addr_t variable to calculate with multiplier of different types,
 * for example: addr += pitch * y_offset_in_blocks;
 * may cause coverity issue with unintentional overflow.
 */
  addr = addr + hdr_size + offset;
 }

 mtk_plane_state->pending.enable = true;
 mtk_plane_state->pending.pitch = pitch;
 mtk_plane_state->pending.hdr_pitch = hdr_pitch;
 mtk_plane_state->pending.format = format;
 mtk_plane_state->pending.modifier = modifier;
 mtk_plane_state->pending.addr = addr;
 mtk_plane_state->pending.hdr_addr = hdr_addr;
 mtk_plane_state->pending.x = new_state->dst.x1;
 mtk_plane_state->pending.y = new_state->dst.y1;
 mtk_plane_state->pending.width = drm_rect_width(&new_state->dst);
 mtk_plane_state->pending.height = drm_rect_height(&new_state->dst);
 mtk_plane_state->pending.rotation = new_state->rotation;
 mtk_plane_state->pending.color_encoding = new_state->color_encoding;
}

static void mtk_plane_atomic_async_update(struct drm_plane *plane,
       struct drm_atomic_state *state)
{
 struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
            plane);
 struct mtk_plane_state *new_plane_state = to_mtk_plane_state(plane->state);

 plane->state->crtc_x = new_state->crtc_x;
 plane->state->crtc_y = new_state->crtc_y;
 plane->state->crtc_h = new_state->crtc_h;
 plane->state->crtc_w = new_state->crtc_w;
 plane->state->src_x = new_state->src_x;
 plane->state->src_y = new_state->src_y;
 plane->state->src_h = new_state->src_h;
 plane->state->src_w = new_state->src_w;
 plane->state->dst.x1 = new_state->dst.x1;
 plane->state->dst.y1 = new_state->dst.y1;

 mtk_plane_update_new_state(new_state, new_plane_state);
 swap(plane->state->fb, new_state->fb);
 wmb(); /* Make sure the above parameters are set before update */
 new_plane_state->pending.async_dirty = true;
 mtk_crtc_async_update(new_state->crtc, plane, state);
}

static const struct drm_plane_funcs mtk_plane_funcs = {
 .update_plane = drm_atomic_helper_update_plane,
 .disable_plane = drm_atomic_helper_disable_plane,
 .destroy = drm_plane_cleanup,
 .reset = mtk_plane_reset,
 .atomic_duplicate_state = mtk_plane_duplicate_state,
 .atomic_destroy_state = mtk_plane_destroy_state,
 .format_mod_supported = mtk_plane_format_mod_supported,
};

static int mtk_plane_atomic_check(struct drm_plane *plane,
      struct drm_atomic_state *state)
{
 struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state,
           plane);
 struct drm_framebuffer *fb = new_plane_state->fb;
 struct drm_crtc_state *crtc_state;
 int ret;

 if (!fb)
  return 0;

 if (WARN_ON(!new_plane_state->crtc))
  return 0;

 ret = mtk_crtc_plane_check(new_plane_state->crtc, plane,
       to_mtk_plane_state(new_plane_state));
 if (ret)
  return ret;

 crtc_state = drm_atomic_get_crtc_state(state,
            new_plane_state->crtc);
 if (IS_ERR(crtc_state))
  return PTR_ERR(crtc_state);

 return drm_atomic_helper_check_plane_state(new_plane_state,
         crtc_state,
         DRM_PLANE_NO_SCALING,
         DRM_PLANE_NO_SCALING,
         true, true);
}

static void mtk_plane_atomic_disable(struct drm_plane *plane,
         struct drm_atomic_state *state)
{
 struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
            plane);
 struct mtk_plane_state *mtk_plane_state = to_mtk_plane_state(new_state);
 struct drm_plane_state *old_state = drm_atomic_get_old_plane_state(state,
            plane);

 mtk_plane_state->pending.enable = false;
 wmb(); /* Make sure the above parameter is set before update */
 mtk_plane_state->pending.dirty = true;

 if (old_state && old_state->crtc)
  mtk_crtc_plane_disable(old_state->crtc, plane);
}

static void mtk_plane_atomic_update(struct drm_plane *plane,
        struct drm_atomic_state *state)
{
 struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
            plane);
 struct mtk_plane_state *mtk_plane_state = to_mtk_plane_state(new_state);

 if (!new_state->crtc || WARN_ON(!new_state->fb))
  return;

 if (!new_state->visible) {
  mtk_plane_atomic_disable(plane, state);
  return;
 }

 mtk_plane_update_new_state(new_state, mtk_plane_state);
 wmb(); /* Make sure the above parameters are set before update */
 mtk_plane_state->pending.dirty = true;
}

static const struct drm_plane_helper_funcs mtk_plane_helper_funcs = {
 .atomic_check = mtk_plane_atomic_check,
 .atomic_update = mtk_plane_atomic_update,
 .atomic_disable = mtk_plane_atomic_disable,
 .atomic_async_update = mtk_plane_atomic_async_update,
 .atomic_async_check = mtk_plane_atomic_async_check,
};

int mtk_plane_init(struct drm_device *dev, struct drm_plane *plane,
     unsigned long possible_crtcs, enum drm_plane_type type,
     unsigned int supported_rotations, const u32 blend_modes,
     const u32 *formats, size_t num_formats,
     bool supports_afbc, unsigned int plane_idx)
{
 int err;

 if (!formats || !num_formats) {
  DRM_ERROR("no formats for plane\n");
  return -EINVAL;
 }

 err = drm_universal_plane_init(dev, plane, possible_crtcs,
           &mtk_plane_funcs, formats,
           num_formats,
           supports_afbc ? modifiers : NULL,
           type, NULL);
 if (err) {
  DRM_ERROR("failed to initialize plane\n");
  return err;
 }

 /*
 * The hardware does not support repositioning planes by muxing: their
 * Z-position is infact fixed and the only way to change the actual
 * order is to swap the contents of the entire register set of one
 * overlay with another, which may be more expensive than desired.
 *
 * With no repositioning, the caller of this function guarantees that
 * the plane_idx is correct. This means that, for example, the PRIMARY
 * plane fed to this function will always have plane_idx zero.
 */
 err = drm_plane_create_zpos_immutable_property(plane, plane_idx);
 if (err) {
  DRM_ERROR("Failed to create zpos property for plane %u\n", plane_idx);
  return err;
 }

 if (supported_rotations) {
  err = drm_plane_create_rotation_property(plane,
        DRM_MODE_ROTATE_0,
        supported_rotations);
  if (err)
   DRM_INFO("Create rotation property failed\n");
 }

 err = drm_plane_create_alpha_property(plane);
 if (err)
  DRM_ERROR("failed to create property: alpha\n");

 if (blend_modes) {
  err = drm_plane_create_blend_mode_property(plane, blend_modes);
  if (err)
   DRM_ERROR("failed to create property: blend_mode\n");
 }

 drm_plane_helper_add(plane, &mtk_plane_helper_funcs);

 return 0;
}