drivers/media/platform/vsp1/vsp1_lif.c

   1 /*
   2  * vsp1_lif.c  --  R-Car VSP1 LCD Controller Interface
   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 #include <linux/gfp.h>
  16
  17 #include <media/v4l2-subdev.h>
  18
  19 #include "vsp1.h"
  20 #include "vsp1_dl.h"
  21 #include "vsp1_lif.h"
  22
  23 #define LIF_MIN_SIZE                            2U
  24 #define LIF_MAX_SIZE                            8190U
  25
  26 /* -----------------------------------------------------------------------------
  27  * Device Access
  28  */
  29
  30 static inline void vsp1_lif_write(struct vsp1_lif *lif, struct vsp1_dl_list *dl,
  31                                   u32 reg, u32 data)
  32 {
  33         vsp1_dl_list_write(dl, reg, data);
  34 }
  35
  36 /* -----------------------------------------------------------------------------
  37  * V4L2 Subdevice Operations
  38  */
  39
  40 static int lif_enum_mbus_code(struct v4l2_subdev *subdev,
  41                               struct v4l2_subdev_pad_config *cfg,
  42                               struct v4l2_subdev_mbus_code_enum *code)
  43 {
  44         static const unsigned int codes[] = {
  45                 MEDIA_BUS_FMT_ARGB8888_1X32,
  46                 MEDIA_BUS_FMT_AYUV8_1X32,
  47         };
  48
  49         return vsp1_subdev_enum_mbus_code(subdev, cfg, code, codes,
  50                                           ARRAY_SIZE(codes));
  51 }
  52
  53 static int lif_enum_frame_size(struct v4l2_subdev *subdev,
  54                                struct v4l2_subdev_pad_config *cfg,
  55                                struct v4l2_subdev_frame_size_enum *fse)
  56 {
  57         return vsp1_subdev_enum_frame_size(subdev, cfg, fse, LIF_MIN_SIZE,
  58                                            LIF_MIN_SIZE, LIF_MAX_SIZE,
  59                                            LIF_MAX_SIZE);
  60 }
  61
  62 static int lif_set_format(struct v4l2_subdev *subdev,
  63                           struct v4l2_subdev_pad_config *cfg,
  64                           struct v4l2_subdev_format *fmt)
  65 {
  66         struct vsp1_lif *lif = to_lif(subdev);
  67         struct v4l2_subdev_pad_config *config;
  68         struct v4l2_mbus_framefmt *format;
  69         int ret = 0;
  70
  71         mutex_lock(&lif->entity.lock);
  72
  73         config = vsp1_entity_get_pad_config(&lif->entity, cfg, fmt->which);
  74         if (!config) {
  75                 ret = -EINVAL;
  76                 goto done;
  77         }
  78
  79         /* Default to YUV if the requested format is not supported. */
  80         if (fmt->format.code != MEDIA_BUS_FMT_ARGB8888_1X32 &&
  81             fmt->format.code != MEDIA_BUS_FMT_AYUV8_1X32)
  82                 fmt->format.code = MEDIA_BUS_FMT_AYUV8_1X32;
  83
  84         format = vsp1_entity_get_pad_format(&lif->entity, config, fmt->pad);
  85
  86         if (fmt->pad == LIF_PAD_SOURCE) {
  87                 /* The LIF source format is always identical to its sink
  88                  * format.
  89                  */
  90                 fmt->format = *format;
  91                 goto done;
  92         }
  93
  94         format->code = fmt->format.code;
  95         format->width = clamp_t(unsigned int, fmt->format.width,
  96                                 LIF_MIN_SIZE, LIF_MAX_SIZE);
  97         format->height = clamp_t(unsigned int, fmt->format.height,
  98                                  LIF_MIN_SIZE, LIF_MAX_SIZE);
  99         format->field = V4L2_FIELD_NONE;
 100         format->colorspace = V4L2_COLORSPACE_SRGB;
 101
 102         fmt->format = *format;
 103
 104         /* Propagate the format to the source pad. */
 105         format = vsp1_entity_get_pad_format(&lif->entity, config,
 106                                             LIF_PAD_SOURCE);
 107         *format = fmt->format;
 108
 109 done:
 110         mutex_unlock(&lif->entity.lock);
 111         return ret;
 112 }
 113
 114 static const struct v4l2_subdev_pad_ops lif_pad_ops = {
 115         .init_cfg = vsp1_entity_init_cfg,
 116         .enum_mbus_code = lif_enum_mbus_code,
 117         .enum_frame_size = lif_enum_frame_size,
 118         .get_fmt = vsp1_subdev_get_pad_format,
 119         .set_fmt = lif_set_format,
 120 };
 121
 122 static const struct v4l2_subdev_ops lif_ops = {
 123         .pad    = &lif_pad_ops,
 124 };
 125
 126 /* -----------------------------------------------------------------------------
 127  * VSP1 Entity Operations
 128  */
 129
 130 static void lif_configure(struct vsp1_entity *entity,
 131                           struct vsp1_pipeline *pipe,
 132                           struct vsp1_dl_list *dl,
 133                           enum vsp1_entity_params params)
 134 {
 135         const struct v4l2_mbus_framefmt *format;
 136         struct vsp1_lif *lif = to_lif(&entity->subdev);
 137         unsigned int hbth = 1300;
 138         unsigned int obth = 400;
 139         unsigned int lbth = 200;
 140
 141         if (params != VSP1_ENTITY_PARAMS_INIT)
 142                 return;
 143
 144         format = vsp1_entity_get_pad_format(&lif->entity, lif->entity.config,
 145                                             LIF_PAD_SOURCE);
 146
 147         obth = min(obth, (format->width + 1) / 2 * format->height - 4);
 148
 149         vsp1_lif_write(lif, dl, VI6_LIF_CSBTH,
 150                         (hbth << VI6_LIF_CSBTH_HBTH_SHIFT) |
 151                         (lbth << VI6_LIF_CSBTH_LBTH_SHIFT));
 152
 153         vsp1_lif_write(lif, dl, VI6_LIF_CTRL,
 154                         (obth << VI6_LIF_CTRL_OBTH_SHIFT) |
 155                         (format->code == 0 ? VI6_LIF_CTRL_CFMT : 0) |
 156                         VI6_LIF_CTRL_REQSEL | VI6_LIF_CTRL_LIF_EN);
 157 }
 158
 159 static const struct vsp1_entity_operations lif_entity_ops = {
 160         .configure = lif_configure,
 161 };
 162
 163 /* -----------------------------------------------------------------------------
 164  * Initialization and Cleanup
 165  */
 166
 167 struct vsp1_lif *vsp1_lif_create(struct vsp1_device *vsp1)
 168 {
 169         struct vsp1_lif *lif;
 170         int ret;
 171
 172         lif = devm_kzalloc(vsp1->dev, sizeof(*lif), GFP_KERNEL);
 173         if (lif == NULL)
 174                 return ERR_PTR(-ENOMEM);
 175
 176         lif->entity.ops = &lif_entity_ops;
 177         lif->entity.type = VSP1_ENTITY_LIF;
 178
 179         /* The LIF is never exposed to userspace, but media entity registration
 180          * requires a function to be set. Use PROC_VIDEO_PIXEL_FORMATTER just to
 181          * avoid triggering a WARN_ON(), the value won't be seen anywhere.
 182          */
 183         ret = vsp1_entity_init(vsp1, &lif->entity, "lif", 2, &lif_ops,
 184                                MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER);
 185         if (ret < 0)
 186                 return ERR_PTR(ret);
 187
 188         return lif;
 189 }