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 26 static 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 37 static const unsigned int lif_codes[] = { 38 MEDIA_BUS_FMT_ARGB8888_1X32, 39 MEDIA_BUS_FMT_AYUV8_1X32, 40 }; 41 42 static int lif_enum_mbus_code(struct v4l2_subdev *subdev, 43 struct v4l2_subdev_state *sd_state, 44 struct v4l2_subdev_mbus_code_enum *code) 45 { 46 return vsp1_subdev_enum_mbus_code(subdev, sd_state, code, lif_codes, 47 ARRAY_SIZE(lif_codes)); 48 } 49 50 static int lif_enum_frame_size(struct v4l2_subdev *subdev, 51 struct v4l2_subdev_state *sd_state, 52 struct v4l2_subdev_frame_size_enum *fse) 53 { 54 return vsp1_subdev_enum_frame_size(subdev, sd_state, fse, 55 LIF_MIN_SIZE, 56 LIF_MIN_SIZE, LIF_MAX_SIZE, 57 LIF_MAX_SIZE); 58 } 59 60 static int lif_set_format(struct v4l2_subdev *subdev, 61 struct v4l2_subdev_state *sd_state, 62 struct v4l2_subdev_format *fmt) 63 { 64 return vsp1_subdev_set_pad_format(subdev, sd_state, fmt, lif_codes, 65 ARRAY_SIZE(lif_codes), 66 LIF_MIN_SIZE, LIF_MIN_SIZE, 67 LIF_MAX_SIZE, LIF_MAX_SIZE); 68 } 69 70 static const struct v4l2_subdev_pad_ops lif_pad_ops = { 71 .init_cfg = vsp1_entity_init_cfg, 72 .enum_mbus_code = lif_enum_mbus_code, 73 .enum_frame_size = lif_enum_frame_size, 74 .get_fmt = vsp1_subdev_get_pad_format, 75 .set_fmt = lif_set_format, 76 }; 77 78 static const struct v4l2_subdev_ops lif_ops = { 79 .pad = &lif_pad_ops, 80 }; 81 82 /* ----------------------------------------------------------------------------- 83 * VSP1 Entity Operations 84 */ 85 86 static void lif_configure_stream(struct vsp1_entity *entity, 87 struct vsp1_pipeline *pipe, 88 struct vsp1_dl_list *dl, 89 struct vsp1_dl_body *dlb) 90 { 91 const struct v4l2_mbus_framefmt *format; 92 struct vsp1_lif *lif = to_lif(&entity->subdev); 93 unsigned int hbth; 94 unsigned int obth; 95 unsigned int lbth; 96 97 format = vsp1_entity_get_pad_format(&lif->entity, lif->entity.config, 98 LIF_PAD_SOURCE); 99 100 switch (entity->vsp1->version & VI6_IP_VERSION_MODEL_MASK) { 101 case VI6_IP_VERSION_MODEL_VSPD_GEN2: 102 case VI6_IP_VERSION_MODEL_VSPD_V2H: 103 hbth = 1536; 104 obth = min(128U, (format->width + 1) / 2 * format->height - 4); 105 lbth = 1520; 106 break; 107 108 case VI6_IP_VERSION_MODEL_VSPDL_GEN3: 109 case VI6_IP_VERSION_MODEL_VSPD_V3: 110 hbth = 0; 111 obth = 1500; 112 lbth = 0; 113 break; 114 115 case VI6_IP_VERSION_MODEL_VSPD_GEN3: 116 default: 117 hbth = 0; 118 obth = 3000; 119 lbth = 0; 120 break; 121 } 122 123 vsp1_lif_write(lif, dlb, VI6_LIF_CSBTH, 124 (hbth << VI6_LIF_CSBTH_HBTH_SHIFT) | 125 (lbth << VI6_LIF_CSBTH_LBTH_SHIFT)); 126 127 vsp1_lif_write(lif, dlb, VI6_LIF_CTRL, 128 (obth << VI6_LIF_CTRL_OBTH_SHIFT) | 129 (format->code == 0 ? VI6_LIF_CTRL_CFMT : 0) | 130 VI6_LIF_CTRL_REQSEL | VI6_LIF_CTRL_LIF_EN); 131 132 /* 133 * On R-Car V3M the LIF0 buffer attribute register has to be set to a 134 * non-default value to guarantee proper operation (otherwise artifacts 135 * may appear on the output). The value required by the manual is not 136 * explained but is likely a buffer size or threshold. 137 */ 138 if ((entity->vsp1->version & VI6_IP_VERSION_MASK) == 139 (VI6_IP_VERSION_MODEL_VSPD_V3 | VI6_IP_VERSION_SOC_V3M)) 140 vsp1_lif_write(lif, dlb, VI6_LIF_LBA, 141 VI6_LIF_LBA_LBA0 | 142 (1536 << VI6_LIF_LBA_LBA1_SHIFT)); 143 } 144 145 static const struct vsp1_entity_operations lif_entity_ops = { 146 .configure_stream = lif_configure_stream, 147 }; 148 149 /* ----------------------------------------------------------------------------- 150 * Initialization and Cleanup 151 */ 152 153 struct vsp1_lif *vsp1_lif_create(struct vsp1_device *vsp1, unsigned int index) 154 { 155 struct vsp1_lif *lif; 156 int ret; 157 158 lif = devm_kzalloc(vsp1->dev, sizeof(*lif), GFP_KERNEL); 159 if (lif == NULL) 160 return ERR_PTR(-ENOMEM); 161 162 lif->entity.ops = &lif_entity_ops; 163 lif->entity.type = VSP1_ENTITY_LIF; 164 lif->entity.index = index; 165 166 /* 167 * The LIF is never exposed to userspace, but media entity registration 168 * requires a function to be set. Use PROC_VIDEO_PIXEL_FORMATTER just to 169 * avoid triggering a WARN_ON(), the value won't be seen anywhere. 170 */ 171 ret = vsp1_entity_init(vsp1, &lif->entity, "lif", 2, &lif_ops, 172 MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER); 173 if (ret < 0) 174 return ERR_PTR(ret); 175 176 return lif; 177 } 178