drivers/gpu/drm/mediatek/mtk_drm_plane.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2015 MediaTek Inc.
   4  * Author: CK Hu <ck.hu@mediatek.com>
   5  */
   6
   7 #include <drm/drmP.h>
   8 #include <drm/drm_atomic.h>
   9 #include <drm/drm_atomic_helper.h>
  10 #include <drm/drm_plane_helper.h>
  11
  12 #include "mtk_drm_crtc.h"
  13 #include "mtk_drm_ddp_comp.h"
  14 #include "mtk_drm_drv.h"
  15 #include "mtk_drm_fb.h"
  16 #include "mtk_drm_gem.h"
  17 #include "mtk_drm_plane.h"
  18
  19 static const u32 formats[] = {
  20         DRM_FORMAT_XRGB8888,
  21         DRM_FORMAT_ARGB8888,
  22         DRM_FORMAT_RGB565,
  23         DRM_FORMAT_UYVY,
  24         DRM_FORMAT_YUYV,
  25 };
  26
  27 static void mtk_plane_reset(struct drm_plane *plane)
  28 {
  29         struct mtk_plane_state *state;
  30
  31         if (plane->state) {
  32                 __drm_atomic_helper_plane_destroy_state(plane->state);
  33
  34                 state = to_mtk_plane_state(plane->state);
  35                 memset(state, 0, sizeof(*state));
  36         } else {
  37                 state = kzalloc(sizeof(*state), GFP_KERNEL);
  38                 if (!state)
  39                         return;
  40                 plane->state = &state->base;
  41         }
  42
  43         state->base.plane = plane;
  44         state->pending.format = DRM_FORMAT_RGB565;
  45 }
  46
  47 static struct drm_plane_state *mtk_plane_duplicate_state(struct drm_plane *plane)
  48 {
  49         struct mtk_plane_state *old_state = to_mtk_plane_state(plane->state);
  50         struct mtk_plane_state *state;
  51
  52         state = kzalloc(sizeof(*state), GFP_KERNEL);
  53         if (!state)
  54                 return NULL;
  55
  56         __drm_atomic_helper_plane_duplicate_state(plane, &state->base);
  57
  58         WARN_ON(state->base.plane != plane);
  59
  60         state->pending = old_state->pending;
  61
  62         return &state->base;
  63 }
  64
  65 static void mtk_drm_plane_destroy_state(struct drm_plane *plane,
  66                                         struct drm_plane_state *state)
  67 {
  68         __drm_atomic_helper_plane_destroy_state(state);
  69         kfree(to_mtk_plane_state(state));
  70 }
  71
  72 static const struct drm_plane_funcs mtk_plane_funcs = {
  73         .update_plane = drm_atomic_helper_update_plane,
  74         .disable_plane = drm_atomic_helper_disable_plane,
  75         .destroy = drm_plane_cleanup,
  76         .reset = mtk_plane_reset,
  77         .atomic_duplicate_state = mtk_plane_duplicate_state,
  78         .atomic_destroy_state = mtk_drm_plane_destroy_state,
  79 };
  80
  81 static int mtk_plane_atomic_check(struct drm_plane *plane,
  82                                   struct drm_plane_state *state)
  83 {
  84         struct drm_framebuffer *fb = state->fb;
  85         struct drm_crtc_state *crtc_state;
  86
  87         if (!fb)
  88                 return 0;
  89
  90         if (!state->crtc)
  91                 return 0;
  92
  93         crtc_state = drm_atomic_get_crtc_state(state->state, state->crtc);
  94         if (IS_ERR(crtc_state))
  95                 return PTR_ERR(crtc_state);
  96
  97         return drm_atomic_helper_check_plane_state(state, crtc_state,
  98                                                    DRM_PLANE_HELPER_NO_SCALING,
  99                                                    DRM_PLANE_HELPER_NO_SCALING,
 100                                                    true, true);
 101 }
 102
 103 static void mtk_plane_atomic_update(struct drm_plane *plane,
 104                                     struct drm_plane_state *old_state)
 105 {
 106         struct mtk_plane_state *state = to_mtk_plane_state(plane->state);
 107         struct drm_crtc *crtc = plane->state->crtc;
 108         struct drm_framebuffer *fb = plane->state->fb;
 109         struct drm_gem_object *gem;
 110         struct mtk_drm_gem_obj *mtk_gem;
 111         unsigned int pitch, format;
 112         dma_addr_t addr;
 113
 114         if (!crtc || WARN_ON(!fb))
 115                 return;
 116
 117         gem = fb->obj[0];
 118         mtk_gem = to_mtk_gem_obj(gem);
 119         addr = mtk_gem->dma_addr;
 120         pitch = fb->pitches[0];
 121         format = fb->format->format;
 122
 123         addr += (plane->state->src.x1 >> 16) * fb->format->cpp[0];
 124         addr += (plane->state->src.y1 >> 16) * pitch;
 125
 126         state->pending.enable = true;
 127         state->pending.pitch = pitch;
 128         state->pending.format = format;
 129         state->pending.addr = addr;
 130         state->pending.x = plane->state->dst.x1;
 131         state->pending.y = plane->state->dst.y1;
 132         state->pending.width = drm_rect_width(&plane->state->dst);
 133         state->pending.height = drm_rect_height(&plane->state->dst);
 134         wmb(); /* Make sure the above parameters are set before update */
 135         state->pending.dirty = true;
 136 }
 137
 138 static void mtk_plane_atomic_disable(struct drm_plane *plane,
 139                                      struct drm_plane_state *old_state)
 140 {
 141         struct mtk_plane_state *state = to_mtk_plane_state(plane->state);
 142
 143         state->pending.enable = false;
 144         wmb(); /* Make sure the above parameter is set before update */
 145         state->pending.dirty = true;
 146 }
 147
 148 static const struct drm_plane_helper_funcs mtk_plane_helper_funcs = {
 149         .atomic_check = mtk_plane_atomic_check,
 150         .atomic_update = mtk_plane_atomic_update,
 151         .atomic_disable = mtk_plane_atomic_disable,
 152 };
 153
 154 int mtk_plane_init(struct drm_device *dev, struct drm_plane *plane,
 155                    unsigned long possible_crtcs, enum drm_plane_type type)
 156 {
 157         int err;
 158
 159         err = drm_universal_plane_init(dev, plane, possible_crtcs,
 160                                        &mtk_plane_funcs, formats,
 161                                        ARRAY_SIZE(formats), NULL, type, NULL);
 162         if (err) {
 163                 DRM_ERROR("failed to initialize plane\n");
 164                 return err;
 165         }
 166
 167         drm_plane_helper_add(plane, &mtk_plane_helper_funcs);
 168
 169         return 0;
 170 }