drivers/media/platform/vsp1/vsp1_rpf.c

   1 /*
   2  * vsp1_rpf.c  --  R-Car VSP1 Read Pixel Formatter
   3  *
   4  * Copyright (C) 2013-2014 Renesas Electronics Corporation
   5  *
   6  * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 #include <linux/device.h>
  15
  16 #include <media/v4l2-subdev.h>
  17
  18 #include "vsp1.h"
  19 #include "vsp1_dl.h"
  20 #include "vsp1_pipe.h"
  21 #include "vsp1_rwpf.h"
  22 #include "vsp1_video.h"
  23
  24 #define RPF_MAX_WIDTH                           8190
  25 #define RPF_MAX_HEIGHT                          8190
  26
  27 /* -----------------------------------------------------------------------------
  28  * Device Access
  29  */
  30
  31 static inline void vsp1_rpf_write(struct vsp1_rwpf *rpf,
  32                                   struct vsp1_dl_list *dl, u32 reg, u32 data)
  33 {
  34         vsp1_dl_list_write(dl, reg + rpf->entity.index * VI6_RPF_OFFSET, data);
  35 }
  36
  37 /* -----------------------------------------------------------------------------
  38  * V4L2 Subdevice Operations
  39  */
  40
  41 static const struct v4l2_subdev_ops rpf_ops = {
  42         .pad    = &vsp1_rwpf_pad_ops,
  43 };
  44
  45 /* -----------------------------------------------------------------------------
  46  * VSP1 Entity Operations
  47  */
  48
  49 static void rpf_configure(struct vsp1_entity *entity,
  50                           struct vsp1_pipeline *pipe,
  51                           struct vsp1_dl_list *dl,
  52                           enum vsp1_entity_params params)
  53 {
  54         struct vsp1_rwpf *rpf = to_rwpf(&entity->subdev);
  55         const struct vsp1_format_info *fmtinfo = rpf->fmtinfo;
  56         const struct v4l2_pix_format_mplane *format = &rpf->format;
  57         const struct v4l2_mbus_framefmt *source_format;
  58         const struct v4l2_mbus_framefmt *sink_format;
  59         unsigned int left = 0;
  60         unsigned int top = 0;
  61         u32 pstride;
  62         u32 infmt;
  63
  64         if (params == VSP1_ENTITY_PARAMS_RUNTIME) {
  65                 vsp1_rpf_write(rpf, dl, VI6_RPF_VRTCOL_SET,
  66                                rpf->alpha << VI6_RPF_VRTCOL_SET_LAYA_SHIFT);
  67                 vsp1_rpf_write(rpf, dl, VI6_RPF_MULT_ALPHA, rpf->mult_alpha |
  68                                (rpf->alpha << VI6_RPF_MULT_ALPHA_RATIO_SHIFT));
  69
  70                 vsp1_pipeline_propagate_alpha(pipe, dl, rpf->alpha);
  71                 return;
  72         }
  73
  74         if (params == VSP1_ENTITY_PARAMS_PARTITION) {
  75                 struct vsp1_device *vsp1 = rpf->entity.vsp1;
  76                 struct vsp1_rwpf_memory mem = rpf->mem;
  77                 struct v4l2_rect crop;
  78
  79                 /*
  80                  * Source size and crop offsets.
  81                  *
  82                  * The crop offsets correspond to the location of the crop
  83                  * rectangle top left corner in the plane buffer. Only two
  84                  * offsets are needed, as planes 2 and 3 always have identical
  85                  * strides.
  86                  */
  87                 crop = *vsp1_rwpf_get_crop(rpf, rpf->entity.config);
  88
  89                 /*
  90                  * Partition Algorithm Control
  91                  *
  92                  * The partition algorithm can split this frame into multiple
  93                  * slices. We must scale our partition window based on the pipe
  94                  * configuration to match the destination partition window.
  95                  * To achieve this, we adjust our crop to provide a 'sub-crop'
  96                  * matching the expected partition window. Only 'left' and
  97                  * 'width' need to be adjusted.
  98                  */
  99                 if (pipe->partitions > 1) {
 100                         crop.width = pipe->partition->rpf.width;
 101                         crop.left += pipe->partition->rpf.left;
 102                 }
 103
 104                 vsp1_rpf_write(rpf, dl, VI6_RPF_SRC_BSIZE,
 105                                (crop.width << VI6_RPF_SRC_BSIZE_BHSIZE_SHIFT) |
 106                                (crop.height << VI6_RPF_SRC_BSIZE_BVSIZE_SHIFT));
 107                 vsp1_rpf_write(rpf, dl, VI6_RPF_SRC_ESIZE,
 108                                (crop.width << VI6_RPF_SRC_ESIZE_EHSIZE_SHIFT) |
 109                                (crop.height << VI6_RPF_SRC_ESIZE_EVSIZE_SHIFT));
 110
 111                 mem.addr[0] += crop.top * format->plane_fmt[0].bytesperline
 112                              + crop.left * fmtinfo->bpp[0] / 8;
 113
 114                 if (format->num_planes > 1) {
 115                         unsigned int offset;
 116
 117                         offset = crop.top * format->plane_fmt[1].bytesperline
 118                                + crop.left / fmtinfo->hsub
 119                                * fmtinfo->bpp[1] / 8;
 120                         mem.addr[1] += offset;
 121                         mem.addr[2] += offset;
 122                 }
 123
 124                 /*
 125                  * On Gen3 hardware the SPUVS bit has no effect on 3-planar
 126                  * formats. Swap the U and V planes manually in that case.
 127                  */
 128                 if (vsp1->info->gen == 3 && format->num_planes == 3 &&
 129                     fmtinfo->swap_uv)
 130                         swap(mem.addr[1], mem.addr[2]);
 131
 132                 vsp1_rpf_write(rpf, dl, VI6_RPF_SRCM_ADDR_Y, mem.addr[0]);
 133                 vsp1_rpf_write(rpf, dl, VI6_RPF_SRCM_ADDR_C0, mem.addr[1]);
 134                 vsp1_rpf_write(rpf, dl, VI6_RPF_SRCM_ADDR_C1, mem.addr[2]);
 135                 return;
 136         }
 137
 138         /* Stride */
 139         pstride = format->plane_fmt[0].bytesperline
 140                 << VI6_RPF_SRCM_PSTRIDE_Y_SHIFT;
 141         if (format->num_planes > 1)
 142                 pstride |= format->plane_fmt[1].bytesperline
 143                         << VI6_RPF_SRCM_PSTRIDE_C_SHIFT;
 144
 145         vsp1_rpf_write(rpf, dl, VI6_RPF_SRCM_PSTRIDE, pstride);
 146
 147         /* Format */
 148         sink_format = vsp1_entity_get_pad_format(&rpf->entity,
 149                                                  rpf->entity.config,
 150                                                  RWPF_PAD_SINK);
 151         source_format = vsp1_entity_get_pad_format(&rpf->entity,
 152                                                    rpf->entity.config,
 153                                                    RWPF_PAD_SOURCE);
 154
 155         infmt = VI6_RPF_INFMT_CIPM
 156               | (fmtinfo->hwfmt << VI6_RPF_INFMT_RDFMT_SHIFT);
 157
 158         if (fmtinfo->swap_yc)
 159                 infmt |= VI6_RPF_INFMT_SPYCS;
 160         if (fmtinfo->swap_uv)
 161                 infmt |= VI6_RPF_INFMT_SPUVS;
 162
 163         if (sink_format->code != source_format->code)
 164                 infmt |= VI6_RPF_INFMT_CSC;
 165
 166         vsp1_rpf_write(rpf, dl, VI6_RPF_INFMT, infmt);
 167         vsp1_rpf_write(rpf, dl, VI6_RPF_DSWAP, fmtinfo->swap);
 168
 169         /* Output location */
 170         if (pipe->bru) {
 171                 const struct v4l2_rect *compose;
 172
 173                 compose = vsp1_entity_get_pad_selection(pipe->bru,
 174                                                         pipe->bru->config,
 175                                                         rpf->bru_input,
 176                                                         V4L2_SEL_TGT_COMPOSE);
 177                 left = compose->left;
 178                 top = compose->top;
 179         }
 180
 181         vsp1_rpf_write(rpf, dl, VI6_RPF_LOC,
 182                        (left << VI6_RPF_LOC_HCOORD_SHIFT) |
 183                        (top << VI6_RPF_LOC_VCOORD_SHIFT));
 184
 185         /*
 186          * On Gen2 use the alpha channel (extended to 8 bits) when available or
 187          * a fixed alpha value set through the V4L2_CID_ALPHA_COMPONENT control
 188          * otherwise.
 189          *
 190          * The Gen3 RPF has extended alpha capability and can both multiply the
 191          * alpha channel by a fixed global alpha value, and multiply the pixel
 192          * components to convert the input to premultiplied alpha.
 193          *
 194          * As alpha premultiplication is available in the BRU for both Gen2 and
 195          * Gen3 we handle it there and use the Gen3 alpha multiplier for global
 196          * alpha multiplication only. This however prevents conversion to
 197          * premultiplied alpha if no BRU is present in the pipeline. If that use
 198          * case turns out to be useful we will revisit the implementation (for
 199          * Gen3 only).
 200          *
 201          * We enable alpha multiplication on Gen3 using the fixed alpha value
 202          * set through the V4L2_CID_ALPHA_COMPONENT control when the input
 203          * contains an alpha channel. On Gen2 the global alpha is ignored in
 204          * that case.
 205          *
 206          * In all cases, disable color keying.
 207          */
 208         vsp1_rpf_write(rpf, dl, VI6_RPF_ALPH_SEL, VI6_RPF_ALPH_SEL_AEXT_EXT |
 209                        (fmtinfo->alpha ? VI6_RPF_ALPH_SEL_ASEL_PACKED
 210                                        : VI6_RPF_ALPH_SEL_ASEL_FIXED));
 211
 212         if (entity->vsp1->info->gen == 3) {
 213                 u32 mult;
 214
 215                 if (fmtinfo->alpha) {
 216                         /*
 217                          * When the input contains an alpha channel enable the
 218                          * alpha multiplier. If the input is premultiplied we
 219                          * need to multiply both the alpha channel and the pixel
 220                          * components by the global alpha value to keep them
 221                          * premultiplied. Otherwise multiply the alpha channel
 222                          * only.
 223                          */
 224                         bool premultiplied = format->flags
 225                                            & V4L2_PIX_FMT_FLAG_PREMUL_ALPHA;
 226
 227                         mult = VI6_RPF_MULT_ALPHA_A_MMD_RATIO
 228                              | (premultiplied ?
 229                                 VI6_RPF_MULT_ALPHA_P_MMD_RATIO :
 230                                 VI6_RPF_MULT_ALPHA_P_MMD_NONE);
 231                 } else {
 232                         /*
 233                          * When the input doesn't contain an alpha channel the
 234                          * global alpha value is applied in the unpacking unit,
 235                          * the alpha multiplier isn't needed and must be
 236                          * disabled.
 237                          */
 238                         mult = VI6_RPF_MULT_ALPHA_A_MMD_NONE
 239                              | VI6_RPF_MULT_ALPHA_P_MMD_NONE;
 240                 }
 241
 242                 rpf->mult_alpha = mult;
 243         }
 244
 245         vsp1_rpf_write(rpf, dl, VI6_RPF_MSK_CTRL, 0);
 246         vsp1_rpf_write(rpf, dl, VI6_RPF_CKEY_CTRL, 0);
 247
 248 }
 249
 250 static void rpf_partition(struct vsp1_entity *entity,
 251                           struct vsp1_pipeline *pipe,
 252                           struct vsp1_partition *partition,
 253                           unsigned int partition_idx,
 254                           struct vsp1_partition_window *window)
 255 {
 256         partition->rpf = *window;
 257 }
 258
 259 static const struct vsp1_entity_operations rpf_entity_ops = {
 260         .configure = rpf_configure,
 261         .partition = rpf_partition,
 262 };
 263
 264 /* -----------------------------------------------------------------------------
 265  * Initialization and Cleanup
 266  */
 267
 268 struct vsp1_rwpf *vsp1_rpf_create(struct vsp1_device *vsp1, unsigned int index)
 269 {
 270         struct vsp1_rwpf *rpf;
 271         char name[6];
 272         int ret;
 273
 274         rpf = devm_kzalloc(vsp1->dev, sizeof(*rpf), GFP_KERNEL);
 275         if (rpf == NULL)
 276                 return ERR_PTR(-ENOMEM);
 277
 278         rpf->max_width = RPF_MAX_WIDTH;
 279         rpf->max_height = RPF_MAX_HEIGHT;
 280
 281         rpf->entity.ops = &rpf_entity_ops;
 282         rpf->entity.type = VSP1_ENTITY_RPF;
 283         rpf->entity.index = index;
 284
 285         sprintf(name, "rpf.%u", index);
 286         ret = vsp1_entity_init(vsp1, &rpf->entity, name, 2, &rpf_ops,
 287                                MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER);
 288         if (ret < 0)
 289                 return ERR_PTR(ret);
 290
 291         /* Initialize the control handler. */
 292         ret = vsp1_rwpf_init_ctrls(rpf, 0);
 293         if (ret < 0) {
 294                 dev_err(vsp1->dev, "rpf%u: failed to initialize controls\n",
 295                         index);
 296                 goto error;
 297         }
 298
 299         v4l2_ctrl_handler_setup(&rpf->ctrls);
 300
 301         return rpf;
 302
 303 error:
 304         vsp1_entity_destroy(&rpf->entity);
 305         return ERR_PTR(ret);
 306 }