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_set_memory(struct vsp1_entity *entity, struct vsp1_dl_list *dl)
  50 {
  51         struct vsp1_rwpf *rpf = entity_to_rwpf(entity);
  52
  53         vsp1_rpf_write(rpf, dl, VI6_RPF_SRCM_ADDR_Y,
  54                        rpf->mem.addr[0] + rpf->offsets[0]);
  55         vsp1_rpf_write(rpf, dl, VI6_RPF_SRCM_ADDR_C0,
  56                        rpf->mem.addr[1] + rpf->offsets[1]);
  57         vsp1_rpf_write(rpf, dl, VI6_RPF_SRCM_ADDR_C1,
  58                        rpf->mem.addr[2] + rpf->offsets[1]);
  59 }
  60
  61 static void rpf_configure(struct vsp1_entity *entity,
  62                           struct vsp1_pipeline *pipe,
  63                           struct vsp1_dl_list *dl)
  64 {
  65         struct vsp1_rwpf *rpf = to_rwpf(&entity->subdev);
  66         const struct vsp1_format_info *fmtinfo = rpf->fmtinfo;
  67         const struct v4l2_pix_format_mplane *format = &rpf->format;
  68         const struct v4l2_mbus_framefmt *source_format;
  69         const struct v4l2_mbus_framefmt *sink_format;
  70         const struct v4l2_rect *crop;
  71         unsigned int left = 0;
  72         unsigned int top = 0;
  73         u32 pstride;
  74         u32 infmt;
  75
  76         /* Source size, stride and crop offsets.
  77          *
  78          * The crop offsets correspond to the location of the crop rectangle top
  79          * left corner in the plane buffer. Only two offsets are needed, as
  80          * planes 2 and 3 always have identical strides.
  81          */
  82         crop = vsp1_rwpf_get_crop(rpf, rpf->entity.config);
  83
  84         vsp1_rpf_write(rpf, dl, VI6_RPF_SRC_BSIZE,
  85                        (crop->width << VI6_RPF_SRC_BSIZE_BHSIZE_SHIFT) |
  86                        (crop->height << VI6_RPF_SRC_BSIZE_BVSIZE_SHIFT));
  87         vsp1_rpf_write(rpf, dl, VI6_RPF_SRC_ESIZE,
  88                        (crop->width << VI6_RPF_SRC_ESIZE_EHSIZE_SHIFT) |
  89                        (crop->height << VI6_RPF_SRC_ESIZE_EVSIZE_SHIFT));
  90
  91         rpf->offsets[0] = crop->top * format->plane_fmt[0].bytesperline
  92                         + crop->left * fmtinfo->bpp[0] / 8;
  93         pstride = format->plane_fmt[0].bytesperline
  94                 << VI6_RPF_SRCM_PSTRIDE_Y_SHIFT;
  95
  96         if (format->num_planes > 1) {
  97                 rpf->offsets[1] = crop->top * format->plane_fmt[1].bytesperline
  98                                 + crop->left * fmtinfo->bpp[1] / 8;
  99                 pstride |= format->plane_fmt[1].bytesperline
 100                         << VI6_RPF_SRCM_PSTRIDE_C_SHIFT;
 101         } else {
 102                 rpf->offsets[1] = 0;
 103         }
 104
 105         vsp1_rpf_write(rpf, dl, VI6_RPF_SRCM_PSTRIDE, pstride);
 106
 107         /* Format */
 108         sink_format = vsp1_entity_get_pad_format(&rpf->entity,
 109                                                  rpf->entity.config,
 110                                                  RWPF_PAD_SINK);
 111         source_format = vsp1_entity_get_pad_format(&rpf->entity,
 112                                                    rpf->entity.config,
 113                                                    RWPF_PAD_SOURCE);
 114
 115         infmt = VI6_RPF_INFMT_CIPM
 116               | (fmtinfo->hwfmt << VI6_RPF_INFMT_RDFMT_SHIFT);
 117
 118         if (fmtinfo->swap_yc)
 119                 infmt |= VI6_RPF_INFMT_SPYCS;
 120         if (fmtinfo->swap_uv)
 121                 infmt |= VI6_RPF_INFMT_SPUVS;
 122
 123         if (sink_format->code != source_format->code)
 124                 infmt |= VI6_RPF_INFMT_CSC;
 125
 126         vsp1_rpf_write(rpf, dl, VI6_RPF_INFMT, infmt);
 127         vsp1_rpf_write(rpf, dl, VI6_RPF_DSWAP, fmtinfo->swap);
 128
 129         /* Output location */
 130         if (pipe->bru) {
 131                 const struct v4l2_rect *compose;
 132
 133                 compose = vsp1_entity_get_pad_selection(pipe->bru,
 134                                                         pipe->bru->config,
 135                                                         rpf->bru_input,
 136                                                         V4L2_SEL_TGT_COMPOSE);
 137                 left = compose->left;
 138                 top = compose->top;
 139         }
 140
 141         vsp1_rpf_write(rpf, dl, VI6_RPF_LOC,
 142                        (left << VI6_RPF_LOC_HCOORD_SHIFT) |
 143                        (top << VI6_RPF_LOC_VCOORD_SHIFT));
 144
 145         /* On Gen2 use the alpha channel (extended to 8 bits) when available or
 146          * a fixed alpha value set through the V4L2_CID_ALPHA_COMPONENT control
 147          * otherwise.
 148          *
 149          * The Gen3 RPF has extended alpha capability and can both multiply the
 150          * alpha channel by a fixed global alpha value, and multiply the pixel
 151          * components to convert the input to premultiplied alpha.
 152          *
 153          * As alpha premultiplication is available in the BRU for both Gen2 and
 154          * Gen3 we handle it there and use the Gen3 alpha multiplier for global
 155          * alpha multiplication only. This however prevents conversion to
 156          * premultiplied alpha if no BRU is present in the pipeline. If that use
 157          * case turns out to be useful we will revisit the implementation (for
 158          * Gen3 only).
 159          *
 160          * We enable alpha multiplication on Gen3 using the fixed alpha value
 161          * set through the V4L2_CID_ALPHA_COMPONENT control when the input
 162          * contains an alpha channel. On Gen2 the global alpha is ignored in
 163          * that case.
 164          *
 165          * In all cases, disable color keying.
 166          */
 167         vsp1_rpf_write(rpf, dl, VI6_RPF_ALPH_SEL, VI6_RPF_ALPH_SEL_AEXT_EXT |
 168                        (fmtinfo->alpha ? VI6_RPF_ALPH_SEL_ASEL_PACKED
 169                                        : VI6_RPF_ALPH_SEL_ASEL_FIXED));
 170
 171         vsp1_rpf_write(rpf, dl, VI6_RPF_VRTCOL_SET,
 172                        rpf->alpha << VI6_RPF_VRTCOL_SET_LAYA_SHIFT);
 173
 174         if (entity->vsp1->info->gen == 3) {
 175                 u32 mult;
 176
 177                 if (fmtinfo->alpha) {
 178                         /* When the input contains an alpha channel enable the
 179                          * alpha multiplier. If the input is premultiplied we
 180                          * need to multiply both the alpha channel and the pixel
 181                          * components by the global alpha value to keep them
 182                          * premultiplied. Otherwise multiply the alpha channel
 183                          * only.
 184                          */
 185                         bool premultiplied = format->flags
 186                                            & V4L2_PIX_FMT_FLAG_PREMUL_ALPHA;
 187
 188                         mult = VI6_RPF_MULT_ALPHA_A_MMD_RATIO
 189                              | (premultiplied ?
 190                                 VI6_RPF_MULT_ALPHA_P_MMD_RATIO :
 191                                 VI6_RPF_MULT_ALPHA_P_MMD_NONE)
 192                              | (rpf->alpha << VI6_RPF_MULT_ALPHA_RATIO_SHIFT);
 193                 } else {
 194                         /* When the input doesn't contain an alpha channel the
 195                          * global alpha value is applied in the unpacking unit,
 196                          * the alpha multiplier isn't needed and must be
 197                          * disabled.
 198                          */
 199                         mult = VI6_RPF_MULT_ALPHA_A_MMD_NONE
 200                              | VI6_RPF_MULT_ALPHA_P_MMD_NONE;
 201                 }
 202
 203                 vsp1_rpf_write(rpf, dl, VI6_RPF_MULT_ALPHA, mult);
 204         }
 205
 206         vsp1_pipeline_propagate_alpha(pipe, &rpf->entity, dl, rpf->alpha);
 207
 208         vsp1_rpf_write(rpf, dl, VI6_RPF_MSK_CTRL, 0);
 209         vsp1_rpf_write(rpf, dl, VI6_RPF_CKEY_CTRL, 0);
 210
 211 }
 212
 213 static const struct vsp1_entity_operations rpf_entity_ops = {
 214         .set_memory = rpf_set_memory,
 215         .configure = rpf_configure,
 216 };
 217
 218 /* -----------------------------------------------------------------------------
 219  * Initialization and Cleanup
 220  */
 221
 222 struct vsp1_rwpf *vsp1_rpf_create(struct vsp1_device *vsp1, unsigned int index)
 223 {
 224         struct vsp1_rwpf *rpf;
 225         char name[6];
 226         int ret;
 227
 228         rpf = devm_kzalloc(vsp1->dev, sizeof(*rpf), GFP_KERNEL);
 229         if (rpf == NULL)
 230                 return ERR_PTR(-ENOMEM);
 231
 232         rpf->max_width = RPF_MAX_WIDTH;
 233         rpf->max_height = RPF_MAX_HEIGHT;
 234
 235         rpf->entity.ops = &rpf_entity_ops;
 236         rpf->entity.type = VSP1_ENTITY_RPF;
 237         rpf->entity.index = index;
 238
 239         sprintf(name, "rpf.%u", index);
 240         ret = vsp1_entity_init(vsp1, &rpf->entity, name, 2, &rpf_ops,
 241                                MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER);
 242         if (ret < 0)
 243                 return ERR_PTR(ret);
 244
 245         /* Initialize the control handler. */
 246         ret = vsp1_rwpf_init_ctrls(rpf);
 247         if (ret < 0) {
 248                 dev_err(vsp1->dev, "rpf%u: failed to initialize controls\n",
 249                         index);
 250                 goto error;
 251         }
 252
 253         return rpf;
 254
 255 error:
 256         vsp1_entity_destroy(&rpf->entity);
 257         return ERR_PTR(ret);
 258 }