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                 unsigned int offsets[2];
  76                 struct v4l2_rect crop;
  77
  78                 /*
  79                  * Source size and crop offsets.
  80                  *
  81                  * The crop offsets correspond to the location of the crop
  82                  * rectangle top left corner in the plane buffer. Only two
  83                  * offsets are needed, as planes 2 and 3 always have identical
  84                  * strides.
  85                  */
  86                 crop = *vsp1_rwpf_get_crop(rpf, rpf->entity.config);
  87
  88                 /*
  89                  * Partition Algorithm Control
  90                  *
  91                  * The partition algorithm can split this frame into multiple
  92                  * slices. We must scale our partition window based on the pipe
  93                  * configuration to match the destination partition window.
  94                  * To achieve this, we adjust our crop to provide a 'sub-crop'
  95                  * matching the expected partition window. Only 'left' and
  96                  * 'width' need to be adjusted.
  97                  */
  98                 if (pipe->partitions > 1) {
  99                         const struct v4l2_mbus_framefmt *output;
 100                         struct vsp1_entity *wpf = &pipe->output->entity;
 101                         unsigned int input_width = crop.width;
 102
 103                         /*
 104                          * Scale the partition window based on the configuration
 105                          * of the pipeline.
 106                          */
 107                         output = vsp1_entity_get_pad_format(wpf, wpf->config,
 108                                                             RWPF_PAD_SOURCE);
 109
 110                         crop.width = pipe->partition.width * input_width
 111                                    / output->width;
 112                         crop.left += pipe->partition.left * input_width
 113                                    / output->width;
 114                 }
 115
 116                 vsp1_rpf_write(rpf, dl, VI6_RPF_SRC_BSIZE,
 117                                (crop.width << VI6_RPF_SRC_BSIZE_BHSIZE_SHIFT) |
 118                                (crop.height << VI6_RPF_SRC_BSIZE_BVSIZE_SHIFT));
 119                 vsp1_rpf_write(rpf, dl, VI6_RPF_SRC_ESIZE,
 120                                (crop.width << VI6_RPF_SRC_ESIZE_EHSIZE_SHIFT) |
 121                                (crop.height << VI6_RPF_SRC_ESIZE_EVSIZE_SHIFT));
 122
 123                 offsets[0] = crop.top * format->plane_fmt[0].bytesperline
 124                            + crop.left * fmtinfo->bpp[0] / 8;
 125
 126                 if (format->num_planes > 1)
 127                         offsets[1] = crop.top * format->plane_fmt[1].bytesperline
 128                                    + crop.left / fmtinfo->hsub
 129                                    * fmtinfo->bpp[1] / 8;
 130                 else
 131                         offsets[1] = 0;
 132
 133                 vsp1_rpf_write(rpf, dl, VI6_RPF_SRCM_ADDR_Y,
 134                                rpf->mem.addr[0] + offsets[0]);
 135                 vsp1_rpf_write(rpf, dl, VI6_RPF_SRCM_ADDR_C0,
 136                                rpf->mem.addr[1] + offsets[1]);
 137                 vsp1_rpf_write(rpf, dl, VI6_RPF_SRCM_ADDR_C1,
 138                                rpf->mem.addr[2] + offsets[1]);
 139                 return;
 140         }
 141
 142         /* Stride */
 143         pstride = format->plane_fmt[0].bytesperline
 144                 << VI6_RPF_SRCM_PSTRIDE_Y_SHIFT;
 145         if (format->num_planes > 1)
 146                 pstride |= format->plane_fmt[1].bytesperline
 147                         << VI6_RPF_SRCM_PSTRIDE_C_SHIFT;
 148
 149         vsp1_rpf_write(rpf, dl, VI6_RPF_SRCM_PSTRIDE, pstride);
 150
 151         /* Format */
 152         sink_format = vsp1_entity_get_pad_format(&rpf->entity,
 153                                                  rpf->entity.config,
 154                                                  RWPF_PAD_SINK);
 155         source_format = vsp1_entity_get_pad_format(&rpf->entity,
 156                                                    rpf->entity.config,
 157                                                    RWPF_PAD_SOURCE);
 158
 159         infmt = VI6_RPF_INFMT_CIPM
 160               | (fmtinfo->hwfmt << VI6_RPF_INFMT_RDFMT_SHIFT);
 161
 162         if (fmtinfo->swap_yc)
 163                 infmt |= VI6_RPF_INFMT_SPYCS;
 164         if (fmtinfo->swap_uv)
 165                 infmt |= VI6_RPF_INFMT_SPUVS;
 166
 167         if (sink_format->code != source_format->code)
 168                 infmt |= VI6_RPF_INFMT_CSC;
 169
 170         vsp1_rpf_write(rpf, dl, VI6_RPF_INFMT, infmt);
 171         vsp1_rpf_write(rpf, dl, VI6_RPF_DSWAP, fmtinfo->swap);
 172
 173         /* Output location */
 174         if (pipe->bru) {
 175                 const struct v4l2_rect *compose;
 176
 177                 compose = vsp1_entity_get_pad_selection(pipe->bru,
 178                                                         pipe->bru->config,
 179                                                         rpf->bru_input,
 180                                                         V4L2_SEL_TGT_COMPOSE);
 181                 left = compose->left;
 182                 top = compose->top;
 183         }
 184
 185         vsp1_rpf_write(rpf, dl, VI6_RPF_LOC,
 186                        (left << VI6_RPF_LOC_HCOORD_SHIFT) |
 187                        (top << VI6_RPF_LOC_VCOORD_SHIFT));
 188
 189         /* On Gen2 use the alpha channel (extended to 8 bits) when available or
 190          * a fixed alpha value set through the V4L2_CID_ALPHA_COMPONENT control
 191          * otherwise.
 192          *
 193          * The Gen3 RPF has extended alpha capability and can both multiply the
 194          * alpha channel by a fixed global alpha value, and multiply the pixel
 195          * components to convert the input to premultiplied alpha.
 196          *
 197          * As alpha premultiplication is available in the BRU for both Gen2 and
 198          * Gen3 we handle it there and use the Gen3 alpha multiplier for global
 199          * alpha multiplication only. This however prevents conversion to
 200          * premultiplied alpha if no BRU is present in the pipeline. If that use
 201          * case turns out to be useful we will revisit the implementation (for
 202          * Gen3 only).
 203          *
 204          * We enable alpha multiplication on Gen3 using the fixed alpha value
 205          * set through the V4L2_CID_ALPHA_COMPONENT control when the input
 206          * contains an alpha channel. On Gen2 the global alpha is ignored in
 207          * that case.
 208          *
 209          * In all cases, disable color keying.
 210          */
 211         vsp1_rpf_write(rpf, dl, VI6_RPF_ALPH_SEL, VI6_RPF_ALPH_SEL_AEXT_EXT |
 212                        (fmtinfo->alpha ? VI6_RPF_ALPH_SEL_ASEL_PACKED
 213                                        : VI6_RPF_ALPH_SEL_ASEL_FIXED));
 214
 215         if (entity->vsp1->info->gen == 3) {
 216                 u32 mult;
 217
 218                 if (fmtinfo->alpha) {
 219                         /* When the input contains an alpha channel enable the
 220                          * alpha multiplier. If the input is premultiplied we
 221                          * need to multiply both the alpha channel and the pixel
 222                          * components by the global alpha value to keep them
 223                          * premultiplied. Otherwise multiply the alpha channel
 224                          * only.
 225                          */
 226                         bool premultiplied = format->flags
 227                                            & V4L2_PIX_FMT_FLAG_PREMUL_ALPHA;
 228
 229                         mult = VI6_RPF_MULT_ALPHA_A_MMD_RATIO
 230                              | (premultiplied ?
 231                                 VI6_RPF_MULT_ALPHA_P_MMD_RATIO :
 232                                 VI6_RPF_MULT_ALPHA_P_MMD_NONE);
 233                 } else {
 234                         /* When the input doesn't contain an alpha channel the
 235                          * global alpha value is applied in the unpacking unit,
 236                          * the alpha multiplier isn't needed and must be
 237                          * disabled.
 238                          */
 239                         mult = VI6_RPF_MULT_ALPHA_A_MMD_NONE
 240                              | VI6_RPF_MULT_ALPHA_P_MMD_NONE;
 241                 }
 242
 243                 rpf->mult_alpha = mult;
 244         }
 245
 246         vsp1_rpf_write(rpf, dl, VI6_RPF_MSK_CTRL, 0);
 247         vsp1_rpf_write(rpf, dl, VI6_RPF_CKEY_CTRL, 0);
 248
 249 }
 250
 251 static const struct vsp1_entity_operations rpf_entity_ops = {
 252         .configure = rpf_configure,
 253 };
 254
 255 /* -----------------------------------------------------------------------------
 256  * Initialization and Cleanup
 257  */
 258
 259 struct vsp1_rwpf *vsp1_rpf_create(struct vsp1_device *vsp1, unsigned int index)
 260 {
 261         struct vsp1_rwpf *rpf;
 262         char name[6];
 263         int ret;
 264
 265         rpf = devm_kzalloc(vsp1->dev, sizeof(*rpf), GFP_KERNEL);
 266         if (rpf == NULL)
 267                 return ERR_PTR(-ENOMEM);
 268
 269         rpf->max_width = RPF_MAX_WIDTH;
 270         rpf->max_height = RPF_MAX_HEIGHT;
 271
 272         rpf->entity.ops = &rpf_entity_ops;
 273         rpf->entity.type = VSP1_ENTITY_RPF;
 274         rpf->entity.index = index;
 275
 276         sprintf(name, "rpf.%u", index);
 277         ret = vsp1_entity_init(vsp1, &rpf->entity, name, 2, &rpf_ops,
 278                                MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER);
 279         if (ret < 0)
 280                 return ERR_PTR(ret);
 281
 282         /* Initialize the control handler. */
 283         ret = vsp1_rwpf_init_ctrls(rpf, 0);
 284         if (ret < 0) {
 285                 dev_err(vsp1->dev, "rpf%u: failed to initialize controls\n",
 286                         index);
 287                 goto error;
 288         }
 289
 290         v4l2_ctrl_handler_setup(&rpf->ctrls);
 291
 292         return rpf;
 293
 294 error:
 295         vsp1_entity_destroy(&rpf->entity);
 296         return ERR_PTR(ret);
 297 }