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 };
  32
  33 static void mtk_plane_reset(struct drm_plane *plane)
  34 {
  35         struct mtk_plane_state *state;
  36
  37         if (plane->state) {
  38                 __drm_atomic_helper_plane_destroy_state(plane->state);
  39
  40                 state = to_mtk_plane_state(plane->state);
  41                 memset(state, 0, sizeof(*state));
  42         } else {
  43                 state = kzalloc(sizeof(*state), GFP_KERNEL);
  44                 if (!state)
  45                         return;
  46                 plane->state = &state->base;
  47         }
  48
  49         state->base.plane = plane;
  50         state->pending.format = DRM_FORMAT_RGB565;
  51 }
  52
  53 static struct drm_plane_state *mtk_plane_duplicate_state(struct drm_plane *plane)
  54 {
  55         struct mtk_plane_state *old_state = to_mtk_plane_state(plane->state);
  56         struct mtk_plane_state *state;
  57
  58         state = kzalloc(sizeof(*state), GFP_KERNEL);
  59         if (!state)
  60                 return NULL;
  61
  62         __drm_atomic_helper_plane_duplicate_state(plane, &state->base);
  63
  64         WARN_ON(state->base.plane != plane);
  65
  66         state->pending = old_state->pending;
  67
  68         return &state->base;
  69 }
  70
  71 static void mtk_drm_plane_destroy_state(struct drm_plane *plane,
  72                                         struct drm_plane_state *state)
  73 {
  74         __drm_atomic_helper_plane_destroy_state(state);
  75         kfree(to_mtk_plane_state(state));
  76 }
  77
  78 static const struct drm_plane_funcs mtk_plane_funcs = {
  79         .update_plane = drm_atomic_helper_update_plane,
  80         .disable_plane = drm_atomic_helper_disable_plane,
  81         .destroy = drm_plane_cleanup,
  82         .reset = mtk_plane_reset,
  83         .atomic_duplicate_state = mtk_plane_duplicate_state,
  84         .atomic_destroy_state = mtk_drm_plane_destroy_state,
  85 };
  86
  87 static int mtk_plane_atomic_check(struct drm_plane *plane,
  88                                   struct drm_plane_state *state)
  89 {
  90         struct drm_framebuffer *fb = state->fb;
  91         struct drm_crtc_state *crtc_state;
  92         struct drm_rect clip = { 0, };
  93
  94         if (!fb)
  95                 return 0;
  96
  97         if (!mtk_fb_get_gem_obj(fb)) {
  98                 DRM_DEBUG_KMS("buffer is null\n");
  99                 return -EFAULT;
 100         }
 101
 102         if (!state->crtc)
 103                 return 0;
 104
 105         crtc_state = drm_atomic_get_crtc_state(state->state, state->crtc);
 106         if (IS_ERR(crtc_state))
 107                 return PTR_ERR(crtc_state);
 108
 109         clip.x2 = crtc_state->mode.hdisplay;
 110         clip.y2 = crtc_state->mode.vdisplay;
 111
 112         return drm_plane_helper_check_state(state, &clip,
 113                                             DRM_PLANE_HELPER_NO_SCALING,
 114                                             DRM_PLANE_HELPER_NO_SCALING,
 115                                             true, true);
 116 }
 117
 118 static void mtk_plane_atomic_update(struct drm_plane *plane,
 119                                     struct drm_plane_state *old_state)
 120 {
 121         struct mtk_plane_state *state = to_mtk_plane_state(plane->state);
 122         struct drm_crtc *crtc = plane->state->crtc;
 123         struct drm_framebuffer *fb = plane->state->fb;
 124         struct drm_gem_object *gem;
 125         struct mtk_drm_gem_obj *mtk_gem;
 126         unsigned int pitch, format;
 127         dma_addr_t addr;
 128
 129         if (!crtc || WARN_ON(!fb))
 130                 return;
 131
 132         gem = mtk_fb_get_gem_obj(fb);
 133         mtk_gem = to_mtk_gem_obj(gem);
 134         addr = mtk_gem->dma_addr;
 135         pitch = fb->pitches[0];
 136         format = fb->pixel_format;
 137
 138         addr += (plane->state->src.x1 >> 16) * drm_format_plane_cpp(format, 0);
 139         addr += (plane->state->src.y1 >> 16) * pitch;
 140
 141         state->pending.enable = true;
 142         state->pending.pitch = pitch;
 143         state->pending.format = format;
 144         state->pending.addr = addr;
 145         state->pending.x = plane->state->dst.x1;
 146         state->pending.y = plane->state->dst.y1;
 147         state->pending.width = drm_rect_width(&plane->state->dst);
 148         state->pending.height = drm_rect_height(&plane->state->dst);
 149         wmb(); /* Make sure the above parameters are set before update */
 150         state->pending.dirty = true;
 151 }
 152
 153 static void mtk_plane_atomic_disable(struct drm_plane *plane,
 154                                      struct drm_plane_state *old_state)
 155 {
 156         struct mtk_plane_state *state = to_mtk_plane_state(plane->state);
 157
 158         state->pending.enable = false;
 159         wmb(); /* Make sure the above parameter is set before update */
 160         state->pending.dirty = true;
 161 }
 162
 163 static const struct drm_plane_helper_funcs mtk_plane_helper_funcs = {
 164         .atomic_check = mtk_plane_atomic_check,
 165         .atomic_update = mtk_plane_atomic_update,
 166         .atomic_disable = mtk_plane_atomic_disable,
 167 };
 168
 169 int mtk_plane_init(struct drm_device *dev, struct drm_plane *plane,
 170                    unsigned long possible_crtcs, enum drm_plane_type type)
 171 {
 172         int err;
 173
 174         err = drm_universal_plane_init(dev, plane, possible_crtcs,
 175                                        &mtk_plane_funcs, formats,
 176                                        ARRAY_SIZE(formats), type, NULL);
 177         if (err) {
 178                 DRM_ERROR("failed to initialize plane\n");
 179                 return err;
 180         }
 181
 182         drm_plane_helper_add(plane, &mtk_plane_helper_funcs);
 183
 184         return 0;
 185 }