drivers/gpu/drm/mediatek/mtk_drm_plane.c

   1 /*
   2  * Copyright (c) 2015 MediaTek Inc.
   3  * Author: CK Hu <ck.hu@mediatek.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <drm/drmP.h>
  16 #include <drm/drm_atomic.h>
  17 #include <drm/drm_atomic_helper.h>
  18 #include <drm/drm_plane_helper.h>
  19
  20 #include "mtk_drm_crtc.h"
  21 #include "mtk_drm_ddp_comp.h"
  22 #include "mtk_drm_drv.h"
  23 #include "mtk_drm_fb.h"
  24 #include "mtk_drm_gem.h"
  25 #include "mtk_drm_plane.h"
  26
  27 static const u32 formats[] = {
  28         DRM_FORMAT_XRGB8888,
  29         DRM_FORMAT_ARGB8888,
  30         DRM_FORMAT_RGB565,
  31         DRM_FORMAT_UYVY,
  32         DRM_FORMAT_YUYV,
  33 };
  34
  35 static void mtk_plane_reset(struct drm_plane *plane)
  36 {
  37         struct mtk_plane_state *state;
  38
  39         if (plane->state) {
  40                 __drm_atomic_helper_plane_destroy_state(plane->state);
  41
  42                 state = to_mtk_plane_state(plane->state);
  43                 memset(state, 0, sizeof(*state));
  44         } else {
  45                 state = kzalloc(sizeof(*state), GFP_KERNEL);
  46                 if (!state)
  47                         return;
  48                 plane->state = &state->base;
  49         }
  50
  51         state->base.plane = plane;
  52         state->pending.format = DRM_FORMAT_RGB565;
  53 }
  54
  55 static struct drm_plane_state *mtk_plane_duplicate_state(struct drm_plane *plane)
  56 {
  57         struct mtk_plane_state *old_state = to_mtk_plane_state(plane->state);
  58         struct mtk_plane_state *state;
  59
  60         state = kzalloc(sizeof(*state), GFP_KERNEL);
  61         if (!state)
  62                 return NULL;
  63
  64         __drm_atomic_helper_plane_duplicate_state(plane, &state->base);
  65
  66         WARN_ON(state->base.plane != plane);
  67
  68         state->pending = old_state->pending;
  69
  70         return &state->base;
  71 }
  72
  73 static void mtk_drm_plane_destroy_state(struct drm_plane *plane,
  74                                         struct drm_plane_state *state)
  75 {
  76         __drm_atomic_helper_plane_destroy_state(state);
  77         kfree(to_mtk_plane_state(state));
  78 }
  79
  80 static const struct drm_plane_funcs mtk_plane_funcs = {
  81         .update_plane = drm_atomic_helper_update_plane,
  82         .disable_plane = drm_atomic_helper_disable_plane,
  83         .destroy = drm_plane_cleanup,
  84         .reset = mtk_plane_reset,
  85         .atomic_duplicate_state = mtk_plane_duplicate_state,
  86         .atomic_destroy_state = mtk_drm_plane_destroy_state,
  87 };
  88
  89 static int mtk_plane_atomic_check(struct drm_plane *plane,
  90                                   struct drm_plane_state *state)
  91 {
  92         struct drm_framebuffer *fb = state->fb;
  93         struct drm_crtc_state *crtc_state;
  94         struct drm_rect clip = { 0, };
  95
  96         if (!fb)
  97                 return 0;
  98
  99         if (!mtk_fb_get_gem_obj(fb)) {
 100                 DRM_DEBUG_KMS("buffer is null\n");
 101                 return -EFAULT;
 102         }
 103
 104         if (!state->crtc)
 105                 return 0;
 106
 107         crtc_state = drm_atomic_get_crtc_state(state->state, state->crtc);
 108         if (IS_ERR(crtc_state))
 109                 return PTR_ERR(crtc_state);
 110
 111         clip.x2 = crtc_state->mode.hdisplay;
 112         clip.y2 = crtc_state->mode.vdisplay;
 113
 114         return drm_plane_helper_check_state(state, &clip,
 115                                             DRM_PLANE_HELPER_NO_SCALING,
 116                                             DRM_PLANE_HELPER_NO_SCALING,
 117                                             true, true);
 118 }
 119
 120 static void mtk_plane_atomic_update(struct drm_plane *plane,
 121                                     struct drm_plane_state *old_state)
 122 {
 123         struct mtk_plane_state *state = to_mtk_plane_state(plane->state);
 124         struct drm_crtc *crtc = plane->state->crtc;
 125         struct drm_framebuffer *fb = plane->state->fb;
 126         struct drm_gem_object *gem;
 127         struct mtk_drm_gem_obj *mtk_gem;
 128         unsigned int pitch, format;
 129         dma_addr_t addr;
 130
 131         if (!crtc || WARN_ON(!fb))
 132                 return;
 133
 134         gem = mtk_fb_get_gem_obj(fb);
 135         mtk_gem = to_mtk_gem_obj(gem);
 136         addr = mtk_gem->dma_addr;
 137         pitch = fb->pitches[0];
 138         format = fb->format->format;
 139
 140         addr += (plane->state->src.x1 >> 16) * fb->format->cpp[0];
 141         addr += (plane->state->src.y1 >> 16) * pitch;
 142
 143         state->pending.enable = true;
 144         state->pending.pitch = pitch;
 145         state->pending.format = format;
 146         state->pending.addr = addr;
 147         state->pending.x = plane->state->dst.x1;
 148         state->pending.y = plane->state->dst.y1;
 149         state->pending.width = drm_rect_width(&plane->state->dst);
 150         state->pending.height = drm_rect_height(&plane->state->dst);
 151         wmb(); /* Make sure the above parameters are set before update */
 152         state->pending.dirty = true;
 153 }
 154
 155 static void mtk_plane_atomic_disable(struct drm_plane *plane,
 156                                      struct drm_plane_state *old_state)
 157 {
 158         struct mtk_plane_state *state = to_mtk_plane_state(plane->state);
 159
 160         state->pending.enable = false;
 161         wmb(); /* Make sure the above parameter is set before update */
 162         state->pending.dirty = true;
 163 }
 164
 165 static const struct drm_plane_helper_funcs mtk_plane_helper_funcs = {
 166         .atomic_check = mtk_plane_atomic_check,
 167         .atomic_update = mtk_plane_atomic_update,
 168         .atomic_disable = mtk_plane_atomic_disable,
 169 };
 170
 171 int mtk_plane_init(struct drm_device *dev, struct drm_plane *plane,
 172                    unsigned long possible_crtcs, enum drm_plane_type type)
 173 {
 174         int err;
 175
 176         err = drm_universal_plane_init(dev, plane, possible_crtcs,
 177                                        &mtk_plane_funcs, formats,
 178                                        ARRAY_SIZE(formats), NULL, type, NULL);
 179         if (err) {
 180                 DRM_ERROR("failed to initialize plane\n");
 181                 return err;
 182         }
 183
 184         drm_plane_helper_add(plane, &mtk_plane_helper_funcs);
 185
 186         return 0;
 187 }