drivers/gpu/drm/arm/malidp_mw.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * (C) COPYRIGHT 2016 ARM Limited. All rights reserved.
   4  * Author: Brian Starkey <brian.starkey@arm.com>
   5  *
   6  * ARM Mali DP Writeback connector implementation
   7  */
   8
   9 #include <drm/drm_atomic.h>
  10 #include <drm/drm_atomic_helper.h>
  11 #include <drm/drm_crtc.h>
  12 #include <drm/drm_fb_cma_helper.h>
  13 #include <drm/drm_fourcc.h>
  14 #include <drm/drm_gem_cma_helper.h>
  15 #include <drm/drm_probe_helper.h>
  16 #include <drm/drm_writeback.h>
  17
  18 #include "malidp_drv.h"
  19 #include "malidp_hw.h"
  20 #include "malidp_mw.h"
  21
  22 #define to_mw_state(_state) (struct malidp_mw_connector_state *)(_state)
  23
  24 struct malidp_mw_connector_state {
  25         struct drm_connector_state base;
  26         dma_addr_t addrs[2];
  27         s32 pitches[2];
  28         u8 format;
  29         u8 n_planes;
  30         bool rgb2yuv_initialized;
  31         const s16 *rgb2yuv_coeffs;
  32 };
  33
  34 static int malidp_mw_connector_get_modes(struct drm_connector *connector)
  35 {
  36         struct drm_device *dev = connector->dev;
  37
  38         return drm_add_modes_noedid(connector, dev->mode_config.max_width,
  39                                     dev->mode_config.max_height);
  40 }
  41
  42 static enum drm_mode_status
  43 malidp_mw_connector_mode_valid(struct drm_connector *connector,
  44                                struct drm_display_mode *mode)
  45 {
  46         struct drm_device *dev = connector->dev;
  47         struct drm_mode_config *mode_config = &dev->mode_config;
  48         int w = mode->hdisplay, h = mode->vdisplay;
  49
  50         if ((w < mode_config->min_width) || (w > mode_config->max_width))
  51                 return MODE_BAD_HVALUE;
  52
  53         if ((h < mode_config->min_height) || (h > mode_config->max_height))
  54                 return MODE_BAD_VVALUE;
  55
  56         return MODE_OK;
  57 }
  58
  59 static const struct drm_connector_helper_funcs malidp_mw_connector_helper_funcs = {
  60         .get_modes = malidp_mw_connector_get_modes,
  61         .mode_valid = malidp_mw_connector_mode_valid,
  62 };
  63
  64 static void malidp_mw_connector_reset(struct drm_connector *connector)
  65 {
  66         struct malidp_mw_connector_state *mw_state =
  67                 kzalloc(sizeof(*mw_state), GFP_KERNEL);
  68
  69         if (connector->state)
  70                 __drm_atomic_helper_connector_destroy_state(connector->state);
  71
  72         kfree(connector->state);
  73         __drm_atomic_helper_connector_reset(connector, &mw_state->base);
  74 }
  75
  76 static enum drm_connector_status
  77 malidp_mw_connector_detect(struct drm_connector *connector, bool force)
  78 {
  79         return connector_status_connected;
  80 }
  81
  82 static void malidp_mw_connector_destroy(struct drm_connector *connector)
  83 {
  84         drm_connector_cleanup(connector);
  85 }
  86
  87 static struct drm_connector_state *
  88 malidp_mw_connector_duplicate_state(struct drm_connector *connector)
  89 {
  90         struct malidp_mw_connector_state *mw_state, *mw_current_state;
  91
  92         if (WARN_ON(!connector->state))
  93                 return NULL;
  94
  95         mw_state = kzalloc(sizeof(*mw_state), GFP_KERNEL);
  96         if (!mw_state)
  97                 return NULL;
  98
  99         mw_current_state = to_mw_state(connector->state);
 100         mw_state->rgb2yuv_coeffs = mw_current_state->rgb2yuv_coeffs;
 101         mw_state->rgb2yuv_initialized = mw_current_state->rgb2yuv_initialized;
 102
 103         __drm_atomic_helper_connector_duplicate_state(connector, &mw_state->base);
 104
 105         return &mw_state->base;
 106 }
 107
 108 static const struct drm_connector_funcs malidp_mw_connector_funcs = {
 109         .reset = malidp_mw_connector_reset,
 110         .detect = malidp_mw_connector_detect,
 111         .fill_modes = drm_helper_probe_single_connector_modes,
 112         .destroy = malidp_mw_connector_destroy,
 113         .atomic_duplicate_state = malidp_mw_connector_duplicate_state,
 114         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 115 };
 116
 117 static const s16 rgb2yuv_coeffs_bt709_limited[MALIDP_COLORADJ_NUM_COEFFS] = {
 118         47,  157,   16,
 119         -26,  -87,  112,
 120         112, -102,  -10,
 121         16,  128,  128
 122 };
 123
 124 static int
 125 malidp_mw_encoder_atomic_check(struct drm_encoder *encoder,
 126                                struct drm_crtc_state *crtc_state,
 127                                struct drm_connector_state *conn_state)
 128 {
 129         struct malidp_mw_connector_state *mw_state = to_mw_state(conn_state);
 130         struct malidp_drm *malidp = encoder->dev->dev_private;
 131         struct drm_framebuffer *fb;
 132         int i, n_planes;
 133
 134         if (!conn_state->writeback_job)
 135                 return 0;
 136
 137         fb = conn_state->writeback_job->fb;
 138         if ((fb->width != crtc_state->mode.hdisplay) ||
 139             (fb->height != crtc_state->mode.vdisplay)) {
 140                 DRM_DEBUG_KMS("Invalid framebuffer size %ux%u\n",
 141                                 fb->width, fb->height);
 142                 return -EINVAL;
 143         }
 144
 145         if (fb->modifier) {
 146                 DRM_DEBUG_KMS("Writeback framebuffer does not support modifiers\n");
 147                 return -EINVAL;
 148         }
 149
 150         mw_state->format =
 151                 malidp_hw_get_format_id(&malidp->dev->hw->map, SE_MEMWRITE,
 152                                         fb->format->format, !!fb->modifier);
 153         if (mw_state->format == MALIDP_INVALID_FORMAT_ID) {
 154                 DRM_DEBUG_KMS("Invalid pixel format %p4cc\n",
 155                               &fb->format->format);
 156                 return -EINVAL;
 157         }
 158
 159         n_planes = fb->format->num_planes;
 160         for (i = 0; i < n_planes; i++) {
 161                 struct drm_gem_cma_object *obj = drm_fb_cma_get_gem_obj(fb, i);
 162                 /* memory write buffers are never rotated */
 163                 u8 alignment = malidp_hw_get_pitch_align(malidp->dev, 0);
 164
 165                 if (fb->pitches[i] & (alignment - 1)) {
 166                         DRM_DEBUG_KMS("Invalid pitch %u for plane %d\n",
 167                                       fb->pitches[i], i);
 168                         return -EINVAL;
 169                 }
 170                 mw_state->pitches[i] = fb->pitches[i];
 171                 mw_state->addrs[i] = obj->paddr + fb->offsets[i];
 172         }
 173         mw_state->n_planes = n_planes;
 174
 175         if (fb->format->is_yuv)
 176                 mw_state->rgb2yuv_coeffs = rgb2yuv_coeffs_bt709_limited;
 177
 178         return 0;
 179 }
 180
 181 static const struct drm_encoder_helper_funcs malidp_mw_encoder_helper_funcs = {
 182         .atomic_check = malidp_mw_encoder_atomic_check,
 183 };
 184
 185 static u32 *get_writeback_formats(struct malidp_drm *malidp, int *n_formats)
 186 {
 187         const struct malidp_hw_regmap *map = &malidp->dev->hw->map;
 188         u32 *formats;
 189         int n, i;
 190
 191         formats = kcalloc(map->n_pixel_formats, sizeof(*formats),
 192                           GFP_KERNEL);
 193         if (!formats)
 194                 return NULL;
 195
 196         for (n = 0, i = 0;  i < map->n_pixel_formats; i++) {
 197                 if (map->pixel_formats[i].layer & SE_MEMWRITE)
 198                         formats[n++] = map->pixel_formats[i].format;
 199         }
 200
 201         *n_formats = n;
 202
 203         return formats;
 204 }
 205
 206 int malidp_mw_connector_init(struct drm_device *drm)
 207 {
 208         struct malidp_drm *malidp = drm->dev_private;
 209         u32 *formats;
 210         int ret, n_formats;
 211
 212         if (!malidp->dev->hw->enable_memwrite)
 213                 return 0;
 214
 215         malidp->mw_connector.encoder.possible_crtcs = 1 << drm_crtc_index(&malidp->crtc);
 216         drm_connector_helper_add(&malidp->mw_connector.base,
 217                                  &malidp_mw_connector_helper_funcs);
 218
 219         formats = get_writeback_formats(malidp, &n_formats);
 220         if (!formats)
 221                 return -ENOMEM;
 222
 223         ret = drm_writeback_connector_init(drm, &malidp->mw_connector,
 224                                            &malidp_mw_connector_funcs,
 225                                            &malidp_mw_encoder_helper_funcs,
 226                                            formats, n_formats);
 227         kfree(formats);
 228         if (ret)
 229                 return ret;
 230
 231         return 0;
 232 }
 233
 234 void malidp_mw_atomic_commit(struct drm_device *drm,
 235                              struct drm_atomic_state *old_state)
 236 {
 237         struct malidp_drm *malidp = drm->dev_private;
 238         struct drm_writeback_connector *mw_conn = &malidp->mw_connector;
 239         struct drm_connector_state *conn_state = mw_conn->base.state;
 240         struct malidp_hw_device *hwdev = malidp->dev;
 241         struct malidp_mw_connector_state *mw_state;
 242
 243         if (!conn_state)
 244                 return;
 245
 246         mw_state = to_mw_state(conn_state);
 247
 248         if (conn_state->writeback_job) {
 249                 struct drm_framebuffer *fb = conn_state->writeback_job->fb;
 250
 251                 DRM_DEV_DEBUG_DRIVER(drm->dev,
 252                                      "Enable memwrite %ux%u:%d %pad fmt: %u\n",
 253                                      fb->width, fb->height,
 254                                      mw_state->pitches[0],
 255                                      &mw_state->addrs[0],
 256                                      mw_state->format);
 257
 258                 drm_writeback_queue_job(mw_conn, conn_state);
 259                 hwdev->hw->enable_memwrite(hwdev, mw_state->addrs,
 260                                            mw_state->pitches, mw_state->n_planes,
 261                                            fb->width, fb->height, mw_state->format,
 262                                            !mw_state->rgb2yuv_initialized ?
 263                                            mw_state->rgb2yuv_coeffs : NULL);
 264                 mw_state->rgb2yuv_initialized = !!mw_state->rgb2yuv_coeffs;
 265         } else {
 266                 DRM_DEV_DEBUG_DRIVER(drm->dev, "Disable memwrite\n");
 267                 hwdev->hw->disable_memwrite(hwdev);
 268         }
 269 }