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media: atomisp: gc0310: Add link-frequency and pixelrate controls

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Add support for the pixelrate control as expected by libcamera,
while at it also add the link-frequency control.

Signed-off-by: Hans de Goede <hansg@kernel.org>
Link: https://lore.kernel.org/r/20250517114106.43494-8-hdegoede@redhat.com
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Hans de Goede 2025-07-06 11:53:15 +02:00 committed by Mauro Carvalho Chehab
parent 5446808037
commit cd3a72c643
1 changed files with 31 additions and 2 deletions
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33
drivers/staging/media/atomisp/i2c/atomisp-gc0310.c
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@ -24,6 +24,17 @@
#define GC0310_NATIVE_WIDTH 656
#define GC0310_NATIVE_HEIGHT 496
/*
* The actual PLL output rate is unknown, the datasheet
* says that the formula for the frame-time in pixels is:
* rowtime = win-width + hblank + sh-delay + 4
* frametime = rowtime * (win-height + vblank)
* Filling this in and multiplying by 30 fps gives:
* pixelrate = (660 + 178 + 42 + 4) * (498 + 27) * 30 = 13923000
*/
#define GC0310_PIXELRATE 13923000
/* single lane, bus-format is 8 bpp, CSI-2 is double data rate */
#define GC0310_LINK_FREQ (GC0310_PIXELRATE * 8 / 2)
#define GC0310_FPS 30
#define GC0310_SKIP_FRAMES 3
@ -76,6 +87,8 @@ struct gc0310_device {
struct v4l2_ctrl_handler handler;
struct v4l2_ctrl *exposure;
struct v4l2_ctrl *gain;
struct v4l2_ctrl *link_freq;
struct v4l2_ctrl *pixel_rate;
} ctrls;
};
@ -251,6 +264,10 @@ static const struct reg_sequence gc0310_VGA_30fps[] = {
{ 0xfe, 0x00 },
};
static const s64 link_freq_menu_items[] = {
GC0310_LINK_FREQ,
};
static int gc0310_gain_set(struct gc0310_device *sensor, u32 gain)
{
u8 again, dgain;
@ -546,7 +563,7 @@ static int gc0310_init_controls(struct gc0310_device *sensor)
{
struct v4l2_ctrl_handler *hdl = &sensor->ctrls.handler;
v4l2_ctrl_handler_init(hdl, 2);
v4l2_ctrl_handler_init(hdl, 4);
/* Use the same lock for controls as for everything else */
hdl->lock = &sensor->input_lock;
@ -559,7 +576,19 @@ static int gc0310_init_controls(struct gc0310_device *sensor)
sensor->ctrls.gain =
v4l2_ctrl_new_std(hdl, &ctrl_ops, V4L2_CID_ANALOGUE_GAIN, 0, 95, 1, 31);
return hdl->error;
sensor->ctrls.link_freq =
v4l2_ctrl_new_int_menu(hdl, NULL, V4L2_CID_LINK_FREQ,
0, 0, link_freq_menu_items);
sensor->ctrls.pixel_rate =
v4l2_ctrl_new_std(hdl, NULL, V4L2_CID_PIXEL_RATE, 0,
GC0310_PIXELRATE, 1, GC0310_PIXELRATE);
if (hdl->error)
return hdl->error;
sensor->ctrls.pixel_rate->flags |= V4L2_CTRL_FLAG_READ_ONLY;
sensor->ctrls.link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
return 0;
}
static void gc0310_remove(struct i2c_client *client)