X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Fdrivers%2Fmedia%2Fplatform%2Fvsp1%2Fvsp1_uds.c;fp=kernel%2Fdrivers%2Fmedia%2Fplatform%2Fvsp1%2Fvsp1_uds.c;h=ccc8243e3493d7728167ade8486e32ebe3e48506;hb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;hp=0000000000000000000000000000000000000000;hpb=98260f3884f4a202f9ca5eabed40b1354c489b29;p=kvmfornfv.git diff --git a/kernel/drivers/media/platform/vsp1/vsp1_uds.c b/kernel/drivers/media/platform/vsp1/vsp1_uds.c new file mode 100644 index 000000000..ccc8243e3 --- /dev/null +++ b/kernel/drivers/media/platform/vsp1/vsp1_uds.c @@ -0,0 +1,357 @@ +/* + * vsp1_uds.c -- R-Car VSP1 Up and Down Scaler + * + * Copyright (C) 2013-2014 Renesas Electronics Corporation + * + * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com) + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include +#include + +#include + +#include "vsp1.h" +#include "vsp1_uds.h" + +#define UDS_MIN_SIZE 4U +#define UDS_MAX_SIZE 8190U + +#define UDS_MIN_FACTOR 0x0100 +#define UDS_MAX_FACTOR 0xffff + +/* ----------------------------------------------------------------------------- + * Device Access + */ + +static inline u32 vsp1_uds_read(struct vsp1_uds *uds, u32 reg) +{ + return vsp1_read(uds->entity.vsp1, + reg + uds->entity.index * VI6_UDS_OFFSET); +} + +static inline void vsp1_uds_write(struct vsp1_uds *uds, u32 reg, u32 data) +{ + vsp1_write(uds->entity.vsp1, + reg + uds->entity.index * VI6_UDS_OFFSET, data); +} + +/* ----------------------------------------------------------------------------- + * Scaling Computation + */ + +void vsp1_uds_set_alpha(struct vsp1_uds *uds, unsigned int alpha) +{ + vsp1_uds_write(uds, VI6_UDS_ALPVAL, alpha << VI6_UDS_ALPVAL_VAL0_SHIFT); +} + +/* + * uds_output_size - Return the output size for an input size and scaling ratio + * @input: input size in pixels + * @ratio: scaling ratio in U4.12 fixed-point format + */ +static unsigned int uds_output_size(unsigned int input, unsigned int ratio) +{ + if (ratio > 4096) { + /* Down-scaling */ + unsigned int mp; + + mp = ratio / 4096; + mp = mp < 4 ? 1 : (mp < 8 ? 2 : 4); + + return (input - 1) / mp * mp * 4096 / ratio + 1; + } else { + /* Up-scaling */ + return (input - 1) * 4096 / ratio + 1; + } +} + +/* + * uds_output_limits - Return the min and max output sizes for an input size + * @input: input size in pixels + * @minimum: minimum output size (returned) + * @maximum: maximum output size (returned) + */ +static void uds_output_limits(unsigned int input, + unsigned int *minimum, unsigned int *maximum) +{ + *minimum = max(uds_output_size(input, UDS_MAX_FACTOR), UDS_MIN_SIZE); + *maximum = min(uds_output_size(input, UDS_MIN_FACTOR), UDS_MAX_SIZE); +} + +/* + * uds_passband_width - Return the passband filter width for a scaling ratio + * @ratio: scaling ratio in U4.12 fixed-point format + */ +static unsigned int uds_passband_width(unsigned int ratio) +{ + if (ratio >= 4096) { + /* Down-scaling */ + unsigned int mp; + + mp = ratio / 4096; + mp = mp < 4 ? 1 : (mp < 8 ? 2 : 4); + + return 64 * 4096 * mp / ratio; + } else { + /* Up-scaling */ + return 64; + } +} + +static unsigned int uds_compute_ratio(unsigned int input, unsigned int output) +{ + /* TODO: This is an approximation that will need to be refined. */ + return (input - 1) * 4096 / (output - 1); +} + +/* ----------------------------------------------------------------------------- + * V4L2 Subdevice Core Operations + */ + +static int uds_s_stream(struct v4l2_subdev *subdev, int enable) +{ + struct vsp1_uds *uds = to_uds(subdev); + const struct v4l2_mbus_framefmt *output; + const struct v4l2_mbus_framefmt *input; + unsigned int hscale; + unsigned int vscale; + bool multitap; + + if (!enable) + return 0; + + input = &uds->entity.formats[UDS_PAD_SINK]; + output = &uds->entity.formats[UDS_PAD_SOURCE]; + + hscale = uds_compute_ratio(input->width, output->width); + vscale = uds_compute_ratio(input->height, output->height); + + dev_dbg(uds->entity.vsp1->dev, "hscale %u vscale %u\n", hscale, vscale); + + /* Multi-tap scaling can't be enabled along with alpha scaling when + * scaling down with a factor lower than or equal to 1/2 in either + * direction. + */ + if (uds->scale_alpha && (hscale >= 8192 || vscale >= 8192)) + multitap = false; + else + multitap = true; + + vsp1_uds_write(uds, VI6_UDS_CTRL, + (uds->scale_alpha ? VI6_UDS_CTRL_AON : 0) | + (multitap ? VI6_UDS_CTRL_BC : 0)); + + vsp1_uds_write(uds, VI6_UDS_PASS_BWIDTH, + (uds_passband_width(hscale) + << VI6_UDS_PASS_BWIDTH_H_SHIFT) | + (uds_passband_width(vscale) + << VI6_UDS_PASS_BWIDTH_V_SHIFT)); + + /* Set the scaling ratios and the output size. */ + vsp1_uds_write(uds, VI6_UDS_SCALE, + (hscale << VI6_UDS_SCALE_HFRAC_SHIFT) | + (vscale << VI6_UDS_SCALE_VFRAC_SHIFT)); + vsp1_uds_write(uds, VI6_UDS_CLIP_SIZE, + (output->width << VI6_UDS_CLIP_SIZE_HSIZE_SHIFT) | + (output->height << VI6_UDS_CLIP_SIZE_VSIZE_SHIFT)); + + return 0; +} + +/* ----------------------------------------------------------------------------- + * V4L2 Subdevice Pad Operations + */ + +static int uds_enum_mbus_code(struct v4l2_subdev *subdev, + struct v4l2_subdev_pad_config *cfg, + struct v4l2_subdev_mbus_code_enum *code) +{ + static const unsigned int codes[] = { + MEDIA_BUS_FMT_ARGB8888_1X32, + MEDIA_BUS_FMT_AYUV8_1X32, + }; + struct vsp1_uds *uds = to_uds(subdev); + + if (code->pad == UDS_PAD_SINK) { + if (code->index >= ARRAY_SIZE(codes)) + return -EINVAL; + + code->code = codes[code->index]; + } else { + struct v4l2_mbus_framefmt *format; + + /* The UDS can't perform format conversion, the sink format is + * always identical to the source format. + */ + if (code->index) + return -EINVAL; + + format = vsp1_entity_get_pad_format(&uds->entity, cfg, + UDS_PAD_SINK, code->which); + code->code = format->code; + } + + return 0; +} + +static int uds_enum_frame_size(struct v4l2_subdev *subdev, + struct v4l2_subdev_pad_config *cfg, + struct v4l2_subdev_frame_size_enum *fse) +{ + struct vsp1_uds *uds = to_uds(subdev); + struct v4l2_mbus_framefmt *format; + + format = vsp1_entity_get_pad_format(&uds->entity, cfg, + UDS_PAD_SINK, fse->which); + + if (fse->index || fse->code != format->code) + return -EINVAL; + + if (fse->pad == UDS_PAD_SINK) { + fse->min_width = UDS_MIN_SIZE; + fse->max_width = UDS_MAX_SIZE; + fse->min_height = UDS_MIN_SIZE; + fse->max_height = UDS_MAX_SIZE; + } else { + uds_output_limits(format->width, &fse->min_width, + &fse->max_width); + uds_output_limits(format->height, &fse->min_height, + &fse->max_height); + } + + return 0; +} + +static int uds_get_format(struct v4l2_subdev *subdev, struct v4l2_subdev_pad_config *cfg, + struct v4l2_subdev_format *fmt) +{ + struct vsp1_uds *uds = to_uds(subdev); + + fmt->format = *vsp1_entity_get_pad_format(&uds->entity, cfg, fmt->pad, + fmt->which); + + return 0; +} + +static void uds_try_format(struct vsp1_uds *uds, struct v4l2_subdev_pad_config *cfg, + unsigned int pad, struct v4l2_mbus_framefmt *fmt, + enum v4l2_subdev_format_whence which) +{ + struct v4l2_mbus_framefmt *format; + unsigned int minimum; + unsigned int maximum; + + switch (pad) { + case UDS_PAD_SINK: + /* Default to YUV if the requested format is not supported. */ + if (fmt->code != MEDIA_BUS_FMT_ARGB8888_1X32 && + fmt->code != MEDIA_BUS_FMT_AYUV8_1X32) + fmt->code = MEDIA_BUS_FMT_AYUV8_1X32; + + fmt->width = clamp(fmt->width, UDS_MIN_SIZE, UDS_MAX_SIZE); + fmt->height = clamp(fmt->height, UDS_MIN_SIZE, UDS_MAX_SIZE); + break; + + case UDS_PAD_SOURCE: + /* The UDS scales but can't perform format conversion. */ + format = vsp1_entity_get_pad_format(&uds->entity, cfg, + UDS_PAD_SINK, which); + fmt->code = format->code; + + uds_output_limits(format->width, &minimum, &maximum); + fmt->width = clamp(fmt->width, minimum, maximum); + uds_output_limits(format->height, &minimum, &maximum); + fmt->height = clamp(fmt->height, minimum, maximum); + break; + } + + fmt->field = V4L2_FIELD_NONE; + fmt->colorspace = V4L2_COLORSPACE_SRGB; +} + +static int uds_set_format(struct v4l2_subdev *subdev, struct v4l2_subdev_pad_config *cfg, + struct v4l2_subdev_format *fmt) +{ + struct vsp1_uds *uds = to_uds(subdev); + struct v4l2_mbus_framefmt *format; + + uds_try_format(uds, cfg, fmt->pad, &fmt->format, fmt->which); + + format = vsp1_entity_get_pad_format(&uds->entity, cfg, fmt->pad, + fmt->which); + *format = fmt->format; + + if (fmt->pad == UDS_PAD_SINK) { + /* Propagate the format to the source pad. */ + format = vsp1_entity_get_pad_format(&uds->entity, cfg, + UDS_PAD_SOURCE, fmt->which); + *format = fmt->format; + + uds_try_format(uds, cfg, UDS_PAD_SOURCE, format, fmt->which); + } + + return 0; +} + +/* ----------------------------------------------------------------------------- + * V4L2 Subdevice Operations + */ + +static struct v4l2_subdev_video_ops uds_video_ops = { + .s_stream = uds_s_stream, +}; + +static struct v4l2_subdev_pad_ops uds_pad_ops = { + .enum_mbus_code = uds_enum_mbus_code, + .enum_frame_size = uds_enum_frame_size, + .get_fmt = uds_get_format, + .set_fmt = uds_set_format, +}; + +static struct v4l2_subdev_ops uds_ops = { + .video = &uds_video_ops, + .pad = &uds_pad_ops, +}; + +/* ----------------------------------------------------------------------------- + * Initialization and Cleanup + */ + +struct vsp1_uds *vsp1_uds_create(struct vsp1_device *vsp1, unsigned int index) +{ + struct v4l2_subdev *subdev; + struct vsp1_uds *uds; + int ret; + + uds = devm_kzalloc(vsp1->dev, sizeof(*uds), GFP_KERNEL); + if (uds == NULL) + return ERR_PTR(-ENOMEM); + + uds->entity.type = VSP1_ENTITY_UDS; + uds->entity.index = index; + + ret = vsp1_entity_init(vsp1, &uds->entity, 2); + if (ret < 0) + return ERR_PTR(ret); + + /* Initialize the V4L2 subdev. */ + subdev = &uds->entity.subdev; + v4l2_subdev_init(subdev, &uds_ops); + + subdev->entity.ops = &vsp1_media_ops; + subdev->internal_ops = &vsp1_subdev_internal_ops; + snprintf(subdev->name, sizeof(subdev->name), "%s uds.%u", + dev_name(vsp1->dev), index); + v4l2_set_subdevdata(subdev, uds); + subdev->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; + + vsp1_entity_init_formats(subdev, NULL); + + return uds; +}