Quelle  rcar_du_vsp.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0+
/*
 * R-Car Display Unit VSP-Based Compositor
 *
 * Copyright (C) 2015 Renesas Electronics Corporation
 *
 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
 */

#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_blend.h>
#include <drm/drm_crtc.h>
#include <drm/drm_fb_dma_helper.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_gem_atomic_helper.h>
#include <drm/drm_gem_dma_helper.h>
#include <drm/drm_managed.h>
#include <drm/drm_vblank.h>

#include <linux/bitops.h>
#include <linux/dma-mapping.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <linux/videodev2.h>

#include <media/vsp1.h>

#include "rcar_du_drv.h"
#include "rcar_du_kms.h"
#include "rcar_du_vsp.h"
#include "rcar_du_writeback.h"

static void rcar_du_vsp_complete(void *private, unsigned int status, u32 crc)
{
 struct rcar_du_crtc *crtc = private;

 if (crtc->vblank_enable)
  drm_crtc_handle_vblank(&crtc->crtc);

 if (status & VSP1_DU_STATUS_COMPLETE)
  rcar_du_crtc_finish_page_flip(crtc);
 if (status & VSP1_DU_STATUS_WRITEBACK)
  rcar_du_writeback_complete(crtc);

 drm_crtc_add_crc_entry(&crtc->crtc, false, 0, &crc);
}

void rcar_du_vsp_enable(struct rcar_du_crtc *crtc)
{
 const struct drm_display_mode *mode = &crtc->crtc.state->adjusted_mode;
 struct rcar_du_device *rcdu = crtc->dev;
 struct vsp1_du_lif_config cfg = {
  .width = mode->hdisplay,
  .height = mode->vdisplay,
  .interlaced = mode->flags & DRM_MODE_FLAG_INTERLACE,
  .callback = rcar_du_vsp_complete,
  .callback_data = crtc,
 };
 struct rcar_du_plane_state state = {
  .state = {
   .alpha = DRM_BLEND_ALPHA_OPAQUE,
   .crtc = &crtc->crtc,
   .dst.x1 = 0,
   .dst.y1 = 0,
   .dst.x2 = mode->hdisplay,
   .dst.y2 = mode->vdisplay,
   .src.x1 = 0,
   .src.y1 = 0,
   .src.x2 = mode->hdisplay << 16,
   .src.y2 = mode->vdisplay << 16,
   .zpos = 0,
  },
  .format = rcar_du_format_info(DRM_FORMAT_XRGB8888),
  .source = RCAR_DU_PLANE_VSPD1,
  .colorkey = 0,
 };

 if (rcdu->info->gen >= 3)
  state.hwindex = (crtc->index % 2) ? 2 : 0;
 else
  state.hwindex = crtc->index % 2;

 __rcar_du_plane_setup(crtc->group, &state);

 vsp1_du_setup_lif(crtc->vsp->vsp, crtc->vsp_pipe, &cfg);
}

void rcar_du_vsp_disable(struct rcar_du_crtc *crtc)
{
 vsp1_du_setup_lif(crtc->vsp->vsp, crtc->vsp_pipe, NULL);
}

void rcar_du_vsp_atomic_begin(struct rcar_du_crtc *crtc)
{
 vsp1_du_atomic_begin(crtc->vsp->vsp, crtc->vsp_pipe);
}

void rcar_du_vsp_atomic_flush(struct rcar_du_crtc *crtc)
{
 struct vsp1_du_atomic_pipe_config cfg = { { 0, } };
 struct rcar_du_crtc_state *state;

 state = to_rcar_crtc_state(crtc->crtc.state);
 cfg.crc = state->crc;

 rcar_du_writeback_setup(crtc, &cfg.writeback);

 vsp1_du_atomic_flush(crtc->vsp->vsp, crtc->vsp_pipe, &cfg);
}

static const u32 rcar_du_vsp_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_ABGR8888,
 DRM_FORMAT_XBGR8888,
 DRM_FORMAT_ARGB8888,
 DRM_FORMAT_XRGB8888,
 DRM_FORMAT_UYVY,
 DRM_FORMAT_YUYV,
 DRM_FORMAT_YVYU,
 DRM_FORMAT_NV12,
 DRM_FORMAT_NV21,
 DRM_FORMAT_NV16,
 DRM_FORMAT_NV61,
 DRM_FORMAT_YUV420,
 DRM_FORMAT_YVU420,
 DRM_FORMAT_YUV422,
 DRM_FORMAT_YVU422,
 DRM_FORMAT_YUV444,
 DRM_FORMAT_YVU444,
};

/*
 * Gen4 supports the same formats as above, and additionally 2-10-10-10 RGB
 * formats and Y210 & Y212 formats.
 */
static const u32 rcar_du_vsp_formats_gen4[] = {
 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_ABGR8888,
 DRM_FORMAT_XBGR8888,
 DRM_FORMAT_ARGB8888,
 DRM_FORMAT_XRGB8888,
 DRM_FORMAT_RGBX1010102,
 DRM_FORMAT_RGBA1010102,
 DRM_FORMAT_ARGB2101010,
 DRM_FORMAT_UYVY,
 DRM_FORMAT_YUYV,
 DRM_FORMAT_YVYU,
 DRM_FORMAT_NV12,
 DRM_FORMAT_NV21,
 DRM_FORMAT_NV16,
 DRM_FORMAT_NV61,
 DRM_FORMAT_YUV420,
 DRM_FORMAT_YVU420,
 DRM_FORMAT_YUV422,
 DRM_FORMAT_YVU422,
 DRM_FORMAT_YUV444,
 DRM_FORMAT_YVU444,
 DRM_FORMAT_Y210,
 DRM_FORMAT_Y212,
};

static u32 rcar_du_vsp_state_get_format(struct rcar_du_vsp_plane_state *state)
{
 u32 fourcc = state->format->fourcc;

 if (state->state.pixel_blend_mode == DRM_MODE_BLEND_PIXEL_NONE) {
  switch (fourcc) {
  case DRM_FORMAT_ARGB1555:
   fourcc = DRM_FORMAT_XRGB1555;
   break;

  case DRM_FORMAT_ARGB4444:
   fourcc = DRM_FORMAT_XRGB4444;
   break;

  case DRM_FORMAT_ARGB8888:
   fourcc = DRM_FORMAT_XRGB8888;
   break;

  case DRM_FORMAT_ABGR8888:
   fourcc = DRM_FORMAT_XBGR8888;
   break;

  case DRM_FORMAT_BGRA8888:
   fourcc = DRM_FORMAT_BGRX8888;
   break;

  case DRM_FORMAT_RGBA1010102:
   fourcc = DRM_FORMAT_RGBX1010102;
   break;
  }
 }

 return fourcc;
}

static void rcar_du_vsp_plane_setup(struct rcar_du_vsp_plane *plane)
{
 struct rcar_du_vsp_plane_state *state =
  to_rcar_vsp_plane_state(plane->plane.state);
 struct rcar_du_crtc *crtc = to_rcar_crtc(state->state.crtc);
 struct drm_framebuffer *fb = plane->plane.state->fb;
 const struct rcar_du_format_info *format;
 struct vsp1_du_atomic_config cfg = {
  .pixelformat = 0,
  .pitch = fb->pitches[0],
  .alpha = state->state.alpha >> 8,
  .zpos = state->state.zpos,
 };
 u32 fourcc = rcar_du_vsp_state_get_format(state);
 unsigned int i;

 cfg.src.left = state->state.src.x1 >> 16;
 cfg.src.top = state->state.src.y1 >> 16;
 cfg.src.width = drm_rect_width(&state->state.src) >> 16;
 cfg.src.height = drm_rect_height(&state->state.src) >> 16;

 cfg.dst.left = state->state.dst.x1;
 cfg.dst.top = state->state.dst.y1;
 cfg.dst.width = drm_rect_width(&state->state.dst);
 cfg.dst.height = drm_rect_height(&state->state.dst);

 for (i = 0; i < state->format->planes; ++i)
  cfg.mem[i] = sg_dma_address(state->sg_tables[i].sgl)
      + fb->offsets[i];

 format = rcar_du_format_info(fourcc);
 cfg.pixelformat = format->v4l2;

 cfg.premult = state->state.pixel_blend_mode == DRM_MODE_BLEND_PREMULTI;

 vsp1_du_atomic_update(plane->vsp->vsp, crtc->vsp_pipe,
         plane->index, &cfg);
}

int rcar_du_vsp_map_fb(struct rcar_du_vsp *vsp, struct drm_framebuffer *fb,
         struct sg_table sg_tables[3])
{
 struct rcar_du_device *rcdu = vsp->dev;
 unsigned int i, j;
 int ret;

 for (i = 0; i < fb->format->num_planes; ++i) {
  struct drm_gem_dma_object *gem = drm_fb_dma_get_gem_obj(fb, i);
  struct sg_table *sgt = &sg_tables[i];

  if (gem->sgt) {
   struct scatterlist *src;
   struct scatterlist *dst;

   /*
 * If the GEM buffer has a scatter gather table, it has
 * been imported from a dma-buf and has no physical
 * address as it might not be physically contiguous.
 * Copy the original scatter gather table to map it to
 * the VSP.
 */
   ret = sg_alloc_table(sgt, gem->sgt->orig_nents,
          GFP_KERNEL);
   if (ret)
    goto fail;

   src = gem->sgt->sgl;
   dst = sgt->sgl;
   for (j = 0; j < gem->sgt->orig_nents; ++j) {
    sg_set_page(dst, sg_page(src), src->length,
         src->offset);
    src = sg_next(src);
    dst = sg_next(dst);
   }
  } else {
   ret = dma_get_sgtable(rcdu->dev, sgt, gem->vaddr,
           gem->dma_addr, gem->base.size);
   if (ret)
    goto fail;
  }

  ret = vsp1_du_map_sg(vsp->vsp, sgt);
  if (ret) {
   sg_free_table(sgt);
   goto fail;
  }
 }

 return 0;

fail:
 while (i--) {
  struct sg_table *sgt = &sg_tables[i];

  vsp1_du_unmap_sg(vsp->vsp, sgt);
  sg_free_table(sgt);
 }

 return ret;
}

static int rcar_du_vsp_plane_prepare_fb(struct drm_plane *plane,
     struct drm_plane_state *state)
{
 struct rcar_du_vsp_plane_state *rstate = to_rcar_vsp_plane_state(state);
 struct rcar_du_vsp *vsp = to_rcar_vsp_plane(plane)->vsp;
 int ret;

 /*
 * There's no need to prepare (and unprepare) the framebuffer when the
 * plane is not visible, as it will not be displayed.
 */
 if (!state->visible)
  return 0;

 ret = rcar_du_vsp_map_fb(vsp, state->fb, rstate->sg_tables);
 if (ret < 0)
  return ret;

 return drm_gem_plane_helper_prepare_fb(plane, state);
}

void rcar_du_vsp_unmap_fb(struct rcar_du_vsp *vsp, struct drm_framebuffer *fb,
     struct sg_table sg_tables[3])
{
 unsigned int i;

 for (i = 0; i < fb->format->num_planes; ++i) {
  struct sg_table *sgt = &sg_tables[i];

  vsp1_du_unmap_sg(vsp->vsp, sgt);
  sg_free_table(sgt);
 }
}

static void rcar_du_vsp_plane_cleanup_fb(struct drm_plane *plane,
      struct drm_plane_state *state)
{
 struct rcar_du_vsp_plane_state *rstate = to_rcar_vsp_plane_state(state);
 struct rcar_du_vsp *vsp = to_rcar_vsp_plane(plane)->vsp;

 if (!state->visible)
  return;

 rcar_du_vsp_unmap_fb(vsp, state->fb, rstate->sg_tables);
}

static int rcar_du_vsp_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 rcar_du_vsp_plane_state *rstate = to_rcar_vsp_plane_state(new_plane_state);

 return __rcar_du_plane_atomic_check(plane, new_plane_state,
         &rstate->format);
}

static void rcar_du_vsp_plane_atomic_update(struct drm_plane *plane,
     struct drm_atomic_state *state)
{
 struct drm_plane_state *old_state = drm_atomic_get_old_plane_state(state, plane);
 struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state, plane);
 struct rcar_du_vsp_plane *rplane = to_rcar_vsp_plane(plane);
 struct rcar_du_crtc *crtc = to_rcar_crtc(old_state->crtc);

 if (new_state->visible)
  rcar_du_vsp_plane_setup(rplane);
 else if (old_state->crtc)
  vsp1_du_atomic_update(rplane->vsp->vsp, crtc->vsp_pipe,
          rplane->index, NULL);
}

static const struct drm_plane_helper_funcs rcar_du_vsp_plane_helper_funcs = {
 .prepare_fb = rcar_du_vsp_plane_prepare_fb,
 .cleanup_fb = rcar_du_vsp_plane_cleanup_fb,
 .atomic_check = rcar_du_vsp_plane_atomic_check,
 .atomic_update = rcar_du_vsp_plane_atomic_update,
};

static struct drm_plane_state *
rcar_du_vsp_plane_atomic_duplicate_state(struct drm_plane *plane)
{
 struct rcar_du_vsp_plane_state *copy;

 if (WARN_ON(!plane->state))
  return NULL;

 copy = kzalloc(sizeof(*copy), GFP_KERNEL);
 if (copy == NULL)
  return NULL;

 __drm_atomic_helper_plane_duplicate_state(plane, ©->state);

 return ©->state;
}

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

static void rcar_du_vsp_plane_reset(struct drm_plane *plane)
{
 struct rcar_du_vsp_plane_state *state;

 if (plane->state) {
  rcar_du_vsp_plane_atomic_destroy_state(plane, plane->state);
  plane->state = NULL;
 }

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

 __drm_atomic_helper_plane_reset(plane, &state->state);
}

static const struct drm_plane_funcs rcar_du_vsp_plane_funcs = {
 .update_plane = drm_atomic_helper_update_plane,
 .disable_plane = drm_atomic_helper_disable_plane,
 .reset = rcar_du_vsp_plane_reset,
 .destroy = drm_plane_cleanup,
 .atomic_duplicate_state = rcar_du_vsp_plane_atomic_duplicate_state,
 .atomic_destroy_state = rcar_du_vsp_plane_atomic_destroy_state,
};

static void rcar_du_vsp_cleanup(struct drm_device *dev, void *res)
{
 struct rcar_du_vsp *vsp = res;
 unsigned int i;

 for (i = 0; i < vsp->num_planes; ++i) {
  struct rcar_du_vsp_plane *plane = &vsp->planes[i];

  drm_plane_cleanup(&plane->plane);
 }

 kfree(vsp->planes);

 put_device(vsp->vsp);
}

int rcar_du_vsp_init(struct rcar_du_vsp *vsp, struct device_node *np,
       unsigned int crtcs)
{
 struct rcar_du_device *rcdu = vsp->dev;
 struct platform_device *pdev;
 unsigned int num_crtcs = hweight32(crtcs);
 unsigned int num_planes;
 unsigned int i;
 int ret;

 /* Find the VSP device and initialize it. */
 pdev = of_find_device_by_node(np);
 if (!pdev)
  return -ENXIO;

 vsp->vsp = &pdev->dev;

 ret = drmm_add_action_or_reset(&rcdu->ddev, rcar_du_vsp_cleanup, vsp);
 if (ret < 0)
  return ret;

 ret = vsp1_du_init(vsp->vsp);
 if (ret < 0)
  return ret;

 num_planes = rcdu->info->num_rpf;

 vsp->planes = kcalloc(num_planes, sizeof(*vsp->planes), GFP_KERNEL);
 if (!vsp->planes)
  return -ENOMEM;

 for (i = 0; i < num_planes; ++i) {
  enum drm_plane_type type = i < num_crtcs
      ? DRM_PLANE_TYPE_PRIMARY
      : DRM_PLANE_TYPE_OVERLAY;
  struct rcar_du_vsp_plane *plane = &vsp->planes[i];
  unsigned int num_formats;
  const u32 *formats;

  if (rcdu->info->gen < 4) {
   num_formats = ARRAY_SIZE(rcar_du_vsp_formats);
   formats = rcar_du_vsp_formats;
  } else {
   num_formats = ARRAY_SIZE(rcar_du_vsp_formats_gen4);
   formats = rcar_du_vsp_formats_gen4;
  }

  plane->vsp = vsp;
  plane->index = i;

  ret = drm_universal_plane_init(&rcdu->ddev, &plane->plane,
            crtcs, &rcar_du_vsp_plane_funcs,
            formats, num_formats,
            NULL, type, NULL);
  if (ret < 0)
   return ret;

  drm_plane_helper_add(&plane->plane,
         &rcar_du_vsp_plane_helper_funcs);

  drm_plane_create_alpha_property(&plane->plane);
  drm_plane_create_zpos_property(&plane->plane, i, 0,
            num_planes - 1);

  drm_plane_create_blend_mode_property(&plane->plane,
     BIT(DRM_MODE_BLEND_PIXEL_NONE) |
     BIT(DRM_MODE_BLEND_PREMULTI) |
     BIT(DRM_MODE_BLEND_COVERAGE));

  vsp->num_planes++;
 }

 return 0;
}