LXR linux/drivers/media/platform/vsp1/vsp1

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * vsp1_lif.c  --  R-Car VSP1 LCD Controller Interface
   4 *
   5 * Copyright (C) 2013-2014 Renesas Electronics Corporation
   6 *
   7 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   8 */
   9
  10#include <linux/device.h>
  11#include <linux/gfp.h>
  12
  13#include <media/v4l2-subdev.h>
  14
  15#include "vsp1.h"
  16#include "vsp1_dl.h"
  17#include "vsp1_lif.h"
  18
  19#define LIF_MIN_SIZE                            2U
  20#define LIF_MAX_SIZE                            8190U
  21
  22/* -----------------------------------------------------------------------------
  23 * Device Access
  24 */
  25
  26static inline void vsp1_lif_write(struct vsp1_lif *lif,
  27                                  struct vsp1_dl_body *dlb, u32 reg, u32 data)
  28{
  29        vsp1_dl_body_write(dlb, reg + lif->entity.index * VI6_LIF_OFFSET,
  30                               data);
  31}
  32
  33/* -----------------------------------------------------------------------------
  34 * V4L2 Subdevice Operations
  35 */
  36
  37static const unsigned int lif_codes[] = {
  38        MEDIA_BUS_FMT_ARGB8888_1X32,
  39        MEDIA_BUS_FMT_AYUV8_1X32,
  40};
  41
  42static int lif_enum_mbus_code(struct v4l2_subdev *subdev,
  43                              struct v4l2_subdev_pad_config *cfg,
  44                              struct v4l2_subdev_mbus_code_enum *code)
  45{
  46        return vsp1_subdev_enum_mbus_code(subdev, cfg, code, lif_codes,
  47                                          ARRAY_SIZE(lif_codes));
  48}
  49
  50static int lif_enum_frame_size(struct v4l2_subdev *subdev,
  51                               struct v4l2_subdev_pad_config *cfg,
  52                               struct v4l2_subdev_frame_size_enum *fse)
  53{
  54        return vsp1_subdev_enum_frame_size(subdev, cfg, fse, LIF_MIN_SIZE,
  55                                           LIF_MIN_SIZE, LIF_MAX_SIZE,
  56                                           LIF_MAX_SIZE);
  57}
  58
  59static int lif_set_format(struct v4l2_subdev *subdev,
  60                          struct v4l2_subdev_pad_config *cfg,
  61                          struct v4l2_subdev_format *fmt)
  62{
  63        return vsp1_subdev_set_pad_format(subdev, cfg, fmt, lif_codes,
  64                                          ARRAY_SIZE(lif_codes),
  65                                          LIF_MIN_SIZE, LIF_MIN_SIZE,
  66                                          LIF_MAX_SIZE, LIF_MAX_SIZE);
  67}
  68
  69static const struct v4l2_subdev_pad_ops lif_pad_ops = {
  70        .init_cfg = vsp1_entity_init_cfg,
  71        .enum_mbus_code = lif_enum_mbus_code,
  72        .enum_frame_size = lif_enum_frame_size,
  73        .get_fmt = vsp1_subdev_get_pad_format,
  74        .set_fmt = lif_set_format,
  75};
  76
  77static const struct v4l2_subdev_ops lif_ops = {
  78        .pad    = &lif_pad_ops,
  79};
  80
  81/* -----------------------------------------------------------------------------
  82 * VSP1 Entity Operations
  83 */
  84
  85static void lif_configure_stream(struct vsp1_entity *entity,
  86                                 struct vsp1_pipeline *pipe,
  87                                 struct vsp1_dl_body *dlb)
  88{
  89        const struct v4l2_mbus_framefmt *format;
  90        struct vsp1_lif *lif = to_lif(&entity->subdev);
  91        unsigned int hbth = 1300;
  92        unsigned int obth = 400;
  93        unsigned int lbth = 200;
  94
  95        format = vsp1_entity_get_pad_format(&lif->entity, lif->entity.config,
  96                                            LIF_PAD_SOURCE);
  97
  98        obth = min(obth, (format->width + 1) / 2 * format->height - 4);
  99
 100        vsp1_lif_write(lif, dlb, VI6_LIF_CSBTH,
 101                        (hbth << VI6_LIF_CSBTH_HBTH_SHIFT) |
 102                        (lbth << VI6_LIF_CSBTH_LBTH_SHIFT));
 103
 104        vsp1_lif_write(lif, dlb, VI6_LIF_CTRL,
 105                        (obth << VI6_LIF_CTRL_OBTH_SHIFT) |
 106                        (format->code == 0 ? VI6_LIF_CTRL_CFMT : 0) |
 107                        VI6_LIF_CTRL_REQSEL | VI6_LIF_CTRL_LIF_EN);
 108
 109        /*
 110         * On R-Car V3M the LIF0 buffer attribute register has to be set to a
 111         * non-default value to guarantee proper operation (otherwise artifacts
 112         * may appear on the output). The value required by the manual is not
 113         * explained but is likely a buffer size or threshold.
 114         */
 115        if ((entity->vsp1->version & VI6_IP_VERSION_MASK) ==
 116            (VI6_IP_VERSION_MODEL_VSPD_V3 | VI6_IP_VERSION_SOC_V3M))
 117                vsp1_lif_write(lif, dlb, VI6_LIF_LBA,
 118                               VI6_LIF_LBA_LBA0 |
 119                               (1536 << VI6_LIF_LBA_LBA1_SHIFT));
 120}
 121
 122static const struct vsp1_entity_operations lif_entity_ops = {
 123        .configure_stream = lif_configure_stream,
 124};
 125
 126/* -----------------------------------------------------------------------------
 127 * Initialization and Cleanup
 128 */
 129
 130struct vsp1_lif *vsp1_lif_create(struct vsp1_device *vsp1, unsigned int index)
 131{
 132        struct vsp1_lif *lif;
 133        int ret;
 134
 135        lif = devm_kzalloc(vsp1->dev, sizeof(*lif), GFP_KERNEL);
 136        if (lif == NULL)
 137                return ERR_PTR(-ENOMEM);
 138
 139        lif->entity.ops = &lif_entity_ops;
 140        lif->entity.type = VSP1_ENTITY_LIF;
 141        lif->entity.index = index;
 142
 143        /*
 144         * The LIF is never exposed to userspace, but media entity registration
 145         * requires a function to be set. Use PROC_VIDEO_PIXEL_FORMATTER just to
 146         * avoid triggering a WARN_ON(), the value won't be seen anywhere.
 147         */
 148        ret = vsp1_entity_init(vsp1, &lif->entity, "lif", 2, &lif_ops,
 149                               MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER);
 150        if (ret < 0)
 151                return ERR_PTR(ret);
 152
 153        return lif;
 154}
 155