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/drm_atomic.h>
   8 #include <drm/drm_atomic_helper.h>
   9 #include <drm/drm_fourcc.h>
  10 #include <drm/drm_plane_helper.h>
  11 #include <drm/drm_gem_framebuffer_helper.h>
  12
  13 #include "mtk_drm_crtc.h"
  14 #include "mtk_drm_ddp_comp.h"
  15 #include "mtk_drm_drv.h"
  16 #include "mtk_drm_fb.h"
  17 #include "mtk_drm_gem.h"
  18 #include "mtk_drm_plane.h"
  19
  20 static const u32 formats[] = {
  21         DRM_FORMAT_XRGB8888,
  22         DRM_FORMAT_ARGB8888,
  23         DRM_FORMAT_RGB565,
  24         DRM_FORMAT_UYVY,
  25         DRM_FORMAT_YUYV,
  26 };
  27
  28 static void mtk_plane_reset(struct drm_plane *plane)
  29 {
  30         struct mtk_plane_state *state;
  31
  32         if (plane->state) {
  33                 __drm_atomic_helper_plane_destroy_state(plane->state);
  34
  35                 state = to_mtk_plane_state(plane->state);
  36                 memset(state, 0, sizeof(*state));
  37         } else {
  38                 state = kzalloc(sizeof(*state), GFP_KERNEL);
  39                 if (!state)
  40                         return;
  41                 plane->state = &state->base;
  42         }
  43
  44         state->base.plane = plane;
  45         state->pending.format = DRM_FORMAT_RGB565;
  46 }
  47
  48 static struct drm_plane_state *mtk_plane_duplicate_state(struct drm_plane *plane)
  49 {
  50         struct mtk_plane_state *old_state = to_mtk_plane_state(plane->state);
  51         struct mtk_plane_state *state;
  52
  53         state = kzalloc(sizeof(*state), GFP_KERNEL);
  54         if (!state)
  55                 return NULL;
  56
  57         __drm_atomic_helper_plane_duplicate_state(plane, &state->base);
  58
  59         WARN_ON(state->base.plane != plane);
  60
  61         state->pending = old_state->pending;
  62
  63         return &state->base;
  64 }
  65
  66 static void mtk_drm_plane_destroy_state(struct drm_plane *plane,
  67                                         struct drm_plane_state *state)
  68 {
  69         __drm_atomic_helper_plane_destroy_state(state);
  70         kfree(to_mtk_plane_state(state));
  71 }
  72
  73 static const struct drm_plane_funcs mtk_plane_funcs = {
  74         .update_plane = drm_atomic_helper_update_plane,
  75         .disable_plane = drm_atomic_helper_disable_plane,
  76         .destroy = drm_plane_cleanup,
  77         .reset = mtk_plane_reset,
  78         .atomic_duplicate_state = mtk_plane_duplicate_state,
  79         .atomic_destroy_state = mtk_drm_plane_destroy_state,
  80 };
  81
  82 static int mtk_plane_atomic_check(struct drm_plane *plane,
  83                                   struct drm_plane_state *state)
  84 {
  85         struct drm_framebuffer *fb = state->fb;
  86         struct drm_crtc_state *crtc_state;
  87
  88         if (!fb)
  89                 return 0;
  90
  91         if (!state->crtc)
  92                 return 0;
  93
  94         crtc_state = drm_atomic_get_crtc_state(state->state, state->crtc);
  95         if (IS_ERR(crtc_state))
  96                 return PTR_ERR(crtc_state);
  97
  98         return drm_atomic_helper_check_plane_state(state, crtc_state,
  99                                                    DRM_PLANE_HELPER_NO_SCALING,
 100                                                    DRM_PLANE_HELPER_NO_SCALING,
 101                                                    true, true);
 102 }
 103
 104 static void mtk_plane_atomic_update(struct drm_plane *plane,
 105                                     struct drm_plane_state *old_state)
 106 {
 107         struct mtk_plane_state *state = to_mtk_plane_state(plane->state);
 108         struct drm_crtc *crtc = plane->state->crtc;
 109         struct drm_framebuffer *fb = plane->state->fb;
 110         struct drm_gem_object *gem;
 111         struct mtk_drm_gem_obj *mtk_gem;
 112         unsigned int pitch, format;
 113         dma_addr_t addr;
 114
 115         if (!crtc || WARN_ON(!fb))
 116                 return;
 117
 118         gem = fb->obj[0];
 119         mtk_gem = to_mtk_gem_obj(gem);
 120         addr = mtk_gem->dma_addr;
 121         pitch = fb->pitches[0];
 122         format = fb->format->format;
 123
 124         addr += (plane->state->src.x1 >> 16) * fb->format->cpp[0];
 125         addr += (plane->state->src.y1 >> 16) * pitch;
 126
 127         state->pending.enable = true;
 128         state->pending.pitch = pitch;
 129         state->pending.format = format;
 130         state->pending.addr = addr;
 131         state->pending.x = plane->state->dst.x1;
 132         state->pending.y = plane->state->dst.y1;
 133         state->pending.width = drm_rect_width(&plane->state->dst);
 134         state->pending.height = drm_rect_height(&plane->state->dst);
 135         wmb(); /* Make sure the above parameters are set before update */
 136         state->pending.dirty = true;
 137 }
 138
 139 static void mtk_plane_atomic_disable(struct drm_plane *plane,
 140                                      struct drm_plane_state *old_state)
 141 {
 142         struct mtk_plane_state *state = to_mtk_plane_state(plane->state);
 143
 144         state->pending.enable = false;
 145         wmb(); /* Make sure the above parameter is set before update */
 146         state->pending.dirty = true;
 147 }
 148
 149 static const struct drm_plane_helper_funcs mtk_plane_helper_funcs = {
 150         .prepare_fb = drm_gem_fb_prepare_fb,
 151         .atomic_check = mtk_plane_atomic_check,
 152         .atomic_update = mtk_plane_atomic_update,
 153         .atomic_disable = mtk_plane_atomic_disable,
 154 };
 155
 156 int mtk_plane_init(struct drm_device *dev, struct drm_plane *plane,
 157                    unsigned long possible_crtcs, enum drm_plane_type type)
 158 {
 159         int err;
 160
 161         err = drm_universal_plane_init(dev, plane, possible_crtcs,
 162                                        &mtk_plane_funcs, formats,
 163                                        ARRAY_SIZE(formats), NULL, type, NULL);
 164         if (err) {
 165                 DRM_ERROR("failed to initialize plane\n");
 166                 return err;
 167         }
 168
 169         drm_plane_helper_add(plane, &mtk_plane_helper_funcs);
 170
 171         return 0;
 172 }