// SPDX-License-Identifier: GPL-2.0+
/*
* vsp1_uds.c -- R-Car VSP1 Up and Down Scaler
*
* Copyright (C) 2013-2014 Renesas Electronics Corporation
*
* Contact: Laurent Pinchart ([email protected])
*/
#include <linux/device.h>
#include <linux/gfp.h>
#include <media/v4l2-subdev.h>
#include "vsp1.h"
#include "vsp1_dl.h"
#include "vsp1_pipe.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 void vsp1_uds_write(struct vsp1_uds *uds,
struct vsp1_dl_body *dlb, u32 reg, u32 data)
{
vsp1_dl_body_write(dlb, reg + uds->entity.index * VI6_UDS_OFFSET, data);
}
/* -----------------------------------------------------------------------------
* Scaling Computation
*/
void vsp1_uds_set_alpha(struct vsp1_entity *entity, struct vsp1_dl_body *dlb,
unsigned int alpha)
{
struct vsp1_uds *uds = to_uds(&entity->subdev);
vsp1_uds_write(uds, dlb, 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 Pad Operations
*/
static int uds_enum_mbus_code(struct v4l2_subdev *subdev,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_mbus_code_enum *code)
{
static const unsigned int codes[] = {
MEDIA_BUS_FMT_ARGB8888_1X32,
MEDIA_BUS_FMT_AYUV8_1X32,
};
return vsp1_subdev_enum_mbus_code(subdev, sd_state, code, codes,
ARRAY_SIZE(codes));
}
static int uds_enum_frame_size(struct v4l2_subdev *subdev,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_frame_size_enum *fse)
{
struct vsp1_uds *uds = to_uds(subdev);
struct v4l2_subdev_state *state;
struct v4l2_mbus_framefmt *format;
int ret = 0;
state = vsp1_entity_get_state(&uds->entity, sd_state, fse->which);
if (!state)
return -EINVAL;
format = v4l2_subdev_state_get_format(state, UDS_PAD_SINK);
mutex_lock(&uds->entity.lock);
if (fse->index || fse->code != format->code) {
ret = -EINVAL;
goto done;
}
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);
}
done:
mutex_unlock(&uds->entity.lock);
return ret;
}
static void uds_try_format(struct vsp1_uds *uds,
struct v4l2_subdev_state *sd_state,
unsigned int pad, struct v4l2_mbus_framefmt *fmt)
{
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 = v4l2_subdev_state_get_format(sd_state, UDS_PAD_SINK);
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_state *sd_state,
struct v4l2_subdev_format *fmt)
{
struct vsp1_uds *uds = to_uds(subdev);
struct v4l2_subdev_state *state;
struct v4l2_mbus_framefmt *format;
int ret = 0;
mutex_lock(&uds->entity.lock);
state = vsp1_entity_get_state(&uds->entity, sd_state, fmt->which);
if (!state) {
ret = -EINVAL;
goto done;
}
uds_try_format(uds, state, fmt->pad, &fmt->format);
format = v4l2_subdev_state_get_format(state, fmt->pad);
*format = fmt->format;
if (fmt->pad == UDS_PAD_SINK) {
/* Propagate the format to the source pad. */
format = v4l2_subdev_state_get_format(state, UDS_PAD_SOURCE);
*format = fmt->format;
uds_try_format(uds, state, UDS_PAD_SOURCE, format);
}
done:
mutex_unlock(&uds->entity.lock);
return ret;
}
/* -----------------------------------------------------------------------------
* V4L2 Subdevice Operations
*/
static const struct v4l2_subdev_pad_ops uds_pad_ops = {
.enum_mbus_code = uds_enum_mbus_code,
.enum_frame_size = uds_enum_frame_size,
.get_fmt = vsp1_subdev_get_pad_format,
.set_fmt = uds_set_format,
};
static const struct v4l2_subdev_ops uds_ops = {
.pad = &uds_pad_ops,
};
/* -----------------------------------------------------------------------------
* VSP1 Entity Operations
*/
static void uds_configure_stream(struct vsp1_entity *entity,
struct v4l2_subdev_state *state,
struct vsp1_pipeline *pipe,
struct vsp1_dl_list *dl,
struct vsp1_dl_body *dlb)
{
struct vsp1_uds *uds = to_uds(&entity->subdev);
const struct v4l2_mbus_framefmt *output;
const struct v4l2_mbus_framefmt *input;
unsigned int hscale;
unsigned int vscale;
bool multitap;
input = v4l2_subdev_state_get_format(state, UDS_PAD_SINK);
output = v4l2_subdev_state_get_format(state, 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, dlb, VI6_UDS_CTRL,
(uds->scale_alpha ? VI6_UDS_CTRL_AON : 0) |
(multitap ? VI6_UDS_CTRL_BC : 0));
vsp1_uds_write(uds, dlb, 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. */
vsp1_uds_write(uds, dlb, VI6_UDS_SCALE,
(hscale << VI6_UDS_SCALE_HFRAC_SHIFT) |
(vscale << VI6_UDS_SCALE_VFRAC_SHIFT));
}
static void uds_configure_partition(struct vsp1_entity *entity,
struct vsp1_pipeline *pipe,
const struct vsp1_partition *partition,
struct vsp1_dl_list *dl,
struct vsp1_dl_body *dlb)
{
struct vsp1_uds *uds = to_uds(&entity->subdev);
/* Input size clipping. */
vsp1_uds_write(uds, dlb, VI6_UDS_HSZCLIP, VI6_UDS_HSZCLIP_HCEN |
(0 << VI6_UDS_HSZCLIP_HCL_OFST_SHIFT) |
(partition->uds_sink.width
<< VI6_UDS_HSZCLIP_HCL_SIZE_SHIFT));
/* Output size clipping. */
vsp1_uds_write(uds, dlb, VI6_UDS_CLIP_SIZE,
(partition->uds_source.width
<< VI6_UDS_CLIP_SIZE_HSIZE_SHIFT) |
(partition->uds_source.height
<< VI6_UDS_CLIP_SIZE_VSIZE_SHIFT));
}
static unsigned int uds_max_width(struct vsp1_entity *entity,
struct v4l2_subdev_state *state,
struct vsp1_pipeline *pipe)
{
const struct v4l2_mbus_framefmt *output;
const struct v4l2_mbus_framefmt *input;
unsigned int hscale;
input = v4l2_subdev_state_get_format(state, UDS_PAD_SINK);
output = v4l2_subdev_state_get_format(state, UDS_PAD_SOURCE);
hscale = output->width / input->width;
/*
* The maximum width of the UDS is 304 pixels. These are input pixels
* in the event of up-scaling, and output pixels in the event of
* downscaling.
*
* To support overlapping partition windows we clamp at units of 256 and
* the remaining pixels are reserved.
*/
if (hscale <= 2)
return 256;
else if (hscale <= 4)
return 512;
else if (hscale <= 8)
return 1024;
else
return 2048;
}
/* -----------------------------------------------------------------------------
* Partition Algorithm Support
*/
static void uds_partition(struct vsp1_entity *entity,
struct v4l2_subdev_state *state,
struct vsp1_pipeline *pipe,
struct vsp1_partition *partition,
unsigned int partition_idx,
struct v4l2_rect *window)
{
const struct v4l2_mbus_framefmt *output;
const struct v4l2_mbus_framefmt *input;
input = v4l2_subdev_state_get_format(state, UDS_PAD_SINK);
output = v4l2_subdev_state_get_format(state, UDS_PAD_SOURCE);
partition->uds_sink.width = window->width * input->width
/ output->width;
partition->uds_sink.left = window->left * input->width
/ output->width;
partition->uds_sink.height = input->height;
partition->uds_sink.top = 0;
partition->uds_source = *window;
*window = partition->uds_sink;
}
static const struct vsp1_entity_operations uds_entity_ops = {
.configure_stream = uds_configure_stream,
.configure_partition = uds_configure_partition,
.max_width = uds_max_width,
.partition = uds_partition,
};
/* -----------------------------------------------------------------------------
* Initialization and Cleanup
*/
struct vsp1_uds *vsp1_uds_create(struct vsp1_device *vsp1, unsigned int index)
{
struct vsp1_uds *uds;
char name[6];
int ret;
uds = devm_kzalloc(vsp1->dev, sizeof(*uds), GFP_KERNEL);
if (uds == NULL)
return ERR_PTR(-ENOMEM);
uds->entity.ops = &uds_entity_ops;
uds->entity.type = VSP1_ENTITY_UDS;
uds->entity.index = index;
sprintf(name, "uds.%u", index);
ret = vsp1_entity_init(vsp1, &uds->entity, name, 2, &uds_ops,
MEDIA_ENT_F_PROC_VIDEO_SCALER);
if (ret < 0)
return ERR_PTR(ret);
return uds;
}
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