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Subject: media: vimc: scaler: Use subdev active state
Author: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
Date: Thu Apr 25 02:57:41 2024 +0300
Store the active formats and crop rectangle in the subdevice active
state. This simplifies implementation of the format and selection
accessors, and allows using the v4l2_subdev_get_fmt() helper to
implement the .get_fmt() operation.
The active configuration that is used in the .process_frame() handler is
still stored in the vimc_scaler_device structure. The driver could
instead access the active state in the .process_frame() handler, but the
required locking could interfere with the real time constraints of the
frame processing. This data would be stored in registers in the
.s_stream() handler for real hardware, storing it in dedicated storage
thus mimics a real driver. To differentiate them from the rest of the
device private data, move the corresponding fields to a sub-structure of
vimc_scaler_device named hw.
Signed-off-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
Signed-off-by: Shuah Khan <sk...@linuxfoundation.org>
Signed-off-by: Hans Verkuil <hverkuil-ci...@xs4all.nl>
drivers/media/test-drivers/vimc/vimc-scaler.c | 124 ++++++++++----------------
1 file changed, 49 insertions(+), 75 deletions(-)
---
diff --git a/drivers/media/test-drivers/vimc/vimc-scaler.c
b/drivers/media/test-drivers/vimc/vimc-scaler.c
index f8639f5b4d0c..47d0d63865a0 100644
--- a/drivers/media/test-drivers/vimc/vimc-scaler.c
+++ b/drivers/media/test-drivers/vimc/vimc-scaler.c
@@ -26,13 +26,20 @@ enum vimc_scaler_pad {
struct vimc_scaler_device {
struct vimc_ent_device ved;
struct v4l2_subdev sd;
- struct v4l2_rect crop_rect;
- /* Frame format for both sink and src pad */
- struct v4l2_mbus_framefmt fmt[2];
- /* Values calculated when the stream starts */
- u8 *src_frame;
- unsigned int bpp;
struct media_pad pads[2];
+
+ u8 *src_frame;
+
+ /*
+ * Virtual "hardware" configuration, filled when the stream starts or
+ * when controls are set.
+ */
+ struct {
+ struct v4l2_mbus_framefmt sink_fmt;
+ struct v4l2_mbus_framefmt src_fmt;
+ struct v4l2_rect sink_crop;
+ unsigned int bpp;
+ } hw;
};
static const struct v4l2_mbus_framefmt fmt_default = {
@@ -132,39 +139,6 @@ static int vimc_scaler_enum_frame_size(struct v4l2_subdev
*sd,
return 0;
}
-static struct v4l2_mbus_framefmt *
-vimc_scaler_pad_format(struct vimc_scaler_device *vscaler,
- struct v4l2_subdev_state *sd_state, u32 pad,
- enum v4l2_subdev_format_whence which)
-{
- if (which == V4L2_SUBDEV_FORMAT_TRY)
- return v4l2_subdev_state_get_format(sd_state, pad);
- else
- return &vscaler->fmt[pad];
-}
-
-static struct v4l2_rect *
-vimc_scaler_pad_crop(struct vimc_scaler_device *vscaler,
- struct v4l2_subdev_state *sd_state,
- enum v4l2_subdev_format_whence which)
-{
- if (which == V4L2_SUBDEV_FORMAT_TRY)
- return v4l2_subdev_state_get_crop(sd_state, VIMC_SCALER_SINK);
- else
- return &vscaler->crop_rect;
-}
-
-static int vimc_scaler_get_fmt(struct v4l2_subdev *sd,
- struct v4l2_subdev_state *sd_state,
- struct v4l2_subdev_format *format)
-{
- struct vimc_scaler_device *vscaler = v4l2_get_subdevdata(sd);
-
- format->format = *vimc_scaler_pad_format(vscaler, sd_state, format->pad,
- format->which);
- return 0;
-}
-
static int vimc_scaler_set_fmt(struct v4l2_subdev *sd,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_format *format)
@@ -176,7 +150,7 @@ static int vimc_scaler_set_fmt(struct v4l2_subdev *sd,
if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE && vscaler->src_frame)
return -EBUSY;
- fmt = vimc_scaler_pad_format(vscaler, sd_state, format->pad,
format->which);
+ fmt = v4l2_subdev_state_get_format(sd_state, format->pad);
/*
* The media bus code and colorspace can only be changed on the sink
@@ -214,14 +188,13 @@ static int vimc_scaler_set_fmt(struct v4l2_subdev *sd,
struct v4l2_mbus_framefmt *src_fmt;
struct v4l2_rect *crop;
- crop = vimc_scaler_pad_crop(vscaler, sd_state, format->which);
+ crop = v4l2_subdev_state_get_crop(sd_state, VIMC_SCALER_SINK);
crop->width = fmt->width;
crop->height = fmt->height;
crop->top = 0;
crop->left = 0;
- src_fmt = vimc_scaler_pad_format(vscaler, sd_state,
VIMC_SCALER_SRC,
- format->which);
+ src_fmt = v4l2_subdev_state_get_format(sd_state,
VIMC_SCALER_SRC);
*src_fmt = *fmt;
}
@@ -234,7 +207,6 @@ static int vimc_scaler_get_selection(struct v4l2_subdev *sd,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_selection *sel)
{
- struct vimc_scaler_device *vscaler = v4l2_get_subdevdata(sd);
struct v4l2_mbus_framefmt *sink_fmt;
if (VIMC_IS_SRC(sel->pad))
@@ -242,11 +214,10 @@ static int vimc_scaler_get_selection(struct v4l2_subdev
*sd,
switch (sel->target) {
case V4L2_SEL_TGT_CROP:
- sel->r = *vimc_scaler_pad_crop(vscaler, sd_state, sel->which);
+ sel->r = *v4l2_subdev_state_get_crop(sd_state,
VIMC_SCALER_SINK);
break;
case V4L2_SEL_TGT_CROP_BOUNDS:
- sink_fmt = vimc_scaler_pad_format(vscaler, sd_state,
VIMC_SCALER_SINK,
- sel->which);
+ sink_fmt = v4l2_subdev_state_get_format(sd_state,
VIMC_SCALER_SINK);
sel->r = vimc_scaler_get_crop_bound_sink(sink_fmt);
break;
default:
@@ -282,9 +253,8 @@ static int vimc_scaler_set_selection(struct v4l2_subdev *sd,
if (sel->which == V4L2_SUBDEV_FORMAT_ACTIVE && vscaler->src_frame)
return -EBUSY;
- crop_rect = vimc_scaler_pad_crop(vscaler, sd_state, sel->which);
- sink_fmt = vimc_scaler_pad_format(vscaler, sd_state, VIMC_SCALER_SINK,
- sel->which);
+ crop_rect = v4l2_subdev_state_get_crop(sd_state, VIMC_SCALER_SINK);
+ sink_fmt = v4l2_subdev_state_get_format(sd_state, VIMC_SCALER_SINK);
vimc_scaler_adjust_sink_crop(&sel->r, sink_fmt);
*crop_rect = sel->r;
@@ -294,7 +264,7 @@ static int vimc_scaler_set_selection(struct v4l2_subdev *sd,
static const struct v4l2_subdev_pad_ops vimc_scaler_pad_ops = {
.enum_mbus_code = vimc_scaler_enum_mbus_code,
.enum_frame_size = vimc_scaler_enum_frame_size,
- .get_fmt = vimc_scaler_get_fmt,
+ .get_fmt = v4l2_subdev_get_fmt,
.set_fmt = vimc_scaler_set_fmt,
.get_selection = vimc_scaler_get_selection,
.set_selection = vimc_scaler_set_selection,
@@ -305,27 +275,38 @@ static int vimc_scaler_s_stream(struct v4l2_subdev *sd,
int enable)
struct vimc_scaler_device *vscaler = v4l2_get_subdevdata(sd);
if (enable) {
- const struct vimc_pix_map *vpix;
+ struct v4l2_subdev_state *state;
+ const struct v4l2_mbus_framefmt *format;
+ const struct v4l2_rect *rect;
unsigned int frame_size;
if (vscaler->src_frame)
return 0;
- /* Save the bytes per pixel of the sink */
- vpix =
vimc_pix_map_by_code(vscaler->fmt[VIMC_SCALER_SINK].code);
- vscaler->bpp = vpix->bpp;
+ state = v4l2_subdev_lock_and_get_active_state(sd);
+
+ /* Save the bytes per pixel of the sink. */
+ format = v4l2_subdev_state_get_format(state, VIMC_SCALER_SINK);
+ vscaler->hw.sink_fmt = *format;
+ vscaler->hw.bpp = vimc_pix_map_by_code(format->code)->bpp;
+
+ /* Calculate the frame size of the source pad. */
+ format = v4l2_subdev_state_get_format(state, VIMC_SCALER_SRC);
+ vscaler->hw.src_fmt = *format;
+ frame_size = format->width * format->height * vscaler->hw.bpp;
+
+ rect = v4l2_subdev_state_get_crop(state, VIMC_SCALER_SINK);
+ vscaler->hw.sink_crop = *rect;
- /* Calculate the frame size of the source pad */
- frame_size = vscaler->fmt[VIMC_SCALER_SRC].width
- * vscaler->fmt[VIMC_SCALER_SRC].height *
vscaler->bpp;
+ v4l2_subdev_unlock_state(state);
- /* Allocate the frame buffer. Use vmalloc to be able to
- * allocate a large amount of memory
+ /*
+ * Allocate the frame buffer. Use vmalloc to be able to allocate
+ * a large amount of memory.
*/
vscaler->src_frame = vmalloc(frame_size);
if (!vscaler->src_frame)
return -ENOMEM;
-
} else {
if (!vscaler->src_frame)
return 0;
@@ -353,9 +334,9 @@ static const struct v4l2_subdev_internal_ops
vimc_scaler_internal_ops = {
static void vimc_scaler_fill_src_frame(const struct vimc_scaler_device *const
vscaler,
const u8 *const sink_frame)
{
- const struct v4l2_mbus_framefmt *src_fmt =
&vscaler->fmt[VIMC_SCALER_SRC];
- const struct v4l2_rect *r = &vscaler->crop_rect;
- unsigned int snk_width = vscaler->fmt[VIMC_SCALER_SINK].width;
+ const struct v4l2_mbus_framefmt *sink_fmt = &vscaler->hw.sink_fmt;
+ const struct v4l2_mbus_framefmt *src_fmt = &vscaler->hw.src_fmt;
+ const struct v4l2_rect *r = &vscaler->hw.sink_crop;
unsigned int src_x, src_y;
u8 *walker = vscaler->src_frame;
@@ -364,16 +345,16 @@ static void vimc_scaler_fill_src_frame(const struct
vimc_scaler_device *const vs
unsigned int snk_y, y_offset;
snk_y = (src_y * r->height) / src_fmt->height + r->top;
- y_offset = snk_y * snk_width * vscaler->bpp;
+ y_offset = snk_y * sink_fmt->width * vscaler->hw.bpp;
for (src_x = 0; src_x < src_fmt->width; src_x++) {
unsigned int snk_x, x_offset, index;
snk_x = (src_x * r->width) / src_fmt->width + r->left;
- x_offset = snk_x * vscaler->bpp;
+ x_offset = snk_x * vscaler->hw.bpp;
index = y_offset + x_offset;
- memcpy(walker, &sink_frame[index], vscaler->bpp);
- walker += vscaler->bpp;
+ memcpy(walker, &sink_frame[index], vscaler->hw.bpp);
+ walker += vscaler->hw.bpp;
}
}
}
@@ -432,13 +413,6 @@ static struct vimc_ent_device *vimc_scaler_add(struct
vimc_device *vimc,
vscaler->ved.process_frame = vimc_scaler_process_frame;
vscaler->ved.dev = vimc->mdev.dev;
- /* Initialize the frame format */
- vscaler->fmt[VIMC_SCALER_SINK] = fmt_default;
- vscaler->fmt[VIMC_SCALER_SRC] = fmt_default;
-
- /* Initialize the crop selection */
- vscaler->crop_rect = crop_rect_default;
-
return &vscaler->ved;
}
