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openwrt/target/linux/bcm27xx/patches-5.15/950-0365-media-i2c-ov9281-Add-support-for-8-bit-readout.patch
Álvaro Fernández Rojas 20ea6adbf1 bcm27xx: add support for linux v5.15 
Build system: x86_64
Build-tested: bcm2708, bcm2709, bcm2710, bcm2711
Run-tested: bcm2708/RPiB+, bcm2709/RPi3B, bcm2710/RPi3B, bcm2711/RPi4B

Signed-off-by: Marty Jones <mj8263788@gmail.com>
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
2022-05-17 15:11:22 +02:00

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From 86e3f6d35527608611176b6591bc6a80bfc0f7cf Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.com>
Date: Tue, 7 Jul 2020 18:29:10 +0100
Subject: [PATCH] media: i2c: ov9281: Add support for 8 bit readout
The sensor supports 8 bit mode as well as 10bit, so add the
relevant code to allow selection of this.
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
drivers/media/i2c/ov9281.c | 66 ++++++++++++++++++++++++++++++--------
1 file changed, 52 insertions(+), 14 deletions(-)
--- a/drivers/media/i2c/ov9281.c
+++ b/drivers/media/i2c/ov9281.c
@@ -29,11 +29,12 @@
#define OV9281_LINK_FREQ_400MHZ 400000000
#define OV9281_LANES 2
-#define OV9281_BITS_PER_SAMPLE 10
/* pixel rate = link frequency * 2 * lanes / BITS_PER_SAMPLE */
-#define OV9281_PIXEL_RATE (OV9281_LINK_FREQ_400MHZ * 2 * \
- OV9281_LANES / OV9281_BITS_PER_SAMPLE)
+#define OV9281_PIXEL_RATE_10BIT (OV9281_LINK_FREQ_400MHZ * 2 * \
+ OV9281_LANES / 10)
+#define OV9281_PIXEL_RATE_8BIT (OV9281_LINK_FREQ_400MHZ * 2 * \
+ OV9281_LANES / 8)
#define OV9281_XVCLK_FREQ 24000000
#define CHIP_ID 0x9281
@@ -122,24 +123,25 @@ struct ov9281 {
struct v4l2_ctrl *digi_gain;
struct v4l2_ctrl *hblank;
struct v4l2_ctrl *vblank;
+ struct v4l2_ctrl *pixel_rate;
struct v4l2_ctrl *test_pattern;
struct mutex mutex;
bool streaming;
bool power_on;
const struct ov9281_mode *cur_mode;
+ u32 code;
};
#define to_ov9281(sd) container_of(sd, struct ov9281, subdev)
/*
* Xclk 24Mhz
- * max_framerate 120fps
+ * max_framerate 120fps for 10 bit, 144fps for 8 bit.
* mipi_datarate per lane 800Mbps
*/
static const struct regval ov9281_1280x800_regs[] = {
{0x0103, 0x01},
{0x0302, 0x32},
- {0x030d, 0x50},
{0x030e, 0x02},
{0x3001, 0x00},
{0x3004, 0x00},
@@ -168,7 +170,6 @@ static const struct regval ov9281_1280x8
{0x3620, 0x6f},
{0x3632, 0x56},
{0x3633, 0x78},
- {0x3662, 0x05},
{0x3666, 0x00},
{0x366f, 0x5a},
{0x3680, 0x84},
@@ -235,6 +236,18 @@ static const struct regval ov9281_1280x8
{REG_NULL, 0x00},
};
+static const struct regval op_10bit[] = {
+ {0x030d, 0x50},
+ {0x3662, 0x05},
+ {REG_NULL, 0x00},
+};
+
+static const struct regval op_8bit[] = {
+ {0x030d, 0x60},
+ {0x3662, 0x07},
+ {REG_NULL, 0x00},
+};
+
static const struct ov9281_mode supported_modes[] = {
{
.width = 1280,
@@ -374,12 +387,13 @@ static int ov9281_set_fmt(struct v4l2_su
{
struct ov9281 *ov9281 = to_ov9281(sd);
const struct ov9281_mode *mode;
- s64 h_blank, vblank_def;
+ s64 h_blank, vblank_def, pixel_rate;
mutex_lock(&ov9281->mutex);
mode = ov9281_find_best_fit(fmt);
- fmt->format.code = MEDIA_BUS_FMT_Y10_1X10;
+ if (fmt->format.code != MEDIA_BUS_FMT_Y8_1X8)
+ fmt->format.code = MEDIA_BUS_FMT_Y10_1X10;
fmt->format.width = mode->width;
fmt->format.height = mode->height;
fmt->format.field = V4L2_FIELD_NONE;
@@ -396,6 +410,7 @@ static int ov9281_set_fmt(struct v4l2_su
*v4l2_subdev_get_try_format(sd, cfg, fmt->pad) = fmt->format;
} else {
ov9281->cur_mode = mode;
+ ov9281->code = fmt->format.code;
h_blank = mode->hts_def - mode->width;
__v4l2_ctrl_modify_range(ov9281->hblank, h_blank,
h_blank, 1, h_blank);
@@ -405,6 +420,11 @@ static int ov9281_set_fmt(struct v4l2_su
OV9281_VTS_MAX - mode->height,
1, vblank_def);
__v4l2_ctrl_s_ctrl(ov9281->vblank, vblank_def);
+
+ pixel_rate = (fmt->format.code == MEDIA_BUS_FMT_Y10_1X10) ?
+ OV9281_PIXEL_RATE_10BIT : OV9281_PIXEL_RATE_8BIT;
+ __v4l2_ctrl_modify_range(ov9281->pixel_rate, pixel_rate,
+ pixel_rate, 1, pixel_rate);
}
mutex_unlock(&ov9281->mutex);
@@ -425,7 +445,7 @@ static int ov9281_get_fmt(struct v4l2_su
} else {
fmt->format.width = mode->width;
fmt->format.height = mode->height;
- fmt->format.code = MEDIA_BUS_FMT_Y10_1X10;
+ fmt->format.code = ov9281->code;
fmt->format.field = V4L2_FIELD_NONE;
fmt->format.colorspace = V4L2_COLORSPACE_SRGB;
fmt->format.ycbcr_enc =
@@ -446,9 +466,16 @@ static int ov9281_enum_mbus_code(struct
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_mbus_code_enum *code)
{
- if (code->index)
+ switch (code->index) {
+ default:
return -EINVAL;
- code->code = MEDIA_BUS_FMT_Y10_1X10;
+ case 0:
+ code->code = MEDIA_BUS_FMT_Y10_1X10;
+ break;
+ case 1:
+ code->code = MEDIA_BUS_FMT_Y8_1X8;
+ break;
+ }
return 0;
}
@@ -460,7 +487,8 @@ static int ov9281_enum_frame_sizes(struc
if (fse->index >= ARRAY_SIZE(supported_modes))
return -EINVAL;
- if (fse->code != MEDIA_BUS_FMT_Y10_1X10)
+ if (fse->code != MEDIA_BUS_FMT_Y10_1X10 &&
+ fse->code != MEDIA_BUS_FMT_Y8_1X8)
return -EINVAL;
fse->min_width = supported_modes[fse->index].width;
@@ -543,6 +571,13 @@ static int __ov9281_start_stream(struct
if (ret)
return ret;
+ if (ov9281->code == MEDIA_BUS_FMT_Y10_1X10)
+ ret = ov9281_write_array(ov9281->client, op_10bit);
+ else
+ ret = ov9281_write_array(ov9281->client, op_8bit);
+ if (ret)
+ return ret;
+
/* In case these controls are set before streaming */
mutex_unlock(&ov9281->mutex);
ret = v4l2_ctrl_handler_setup(&ov9281->ctrl_handler);
@@ -849,8 +884,11 @@ static int ov9281_initialize_controls(st
if (ctrl)
ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
- v4l2_ctrl_new_std(handler, NULL, V4L2_CID_PIXEL_RATE,
- 0, OV9281_PIXEL_RATE, 1, OV9281_PIXEL_RATE);
+ ov9281->pixel_rate = v4l2_ctrl_new_std(handler, NULL,
+ V4L2_CID_PIXEL_RATE,
+ OV9281_PIXEL_RATE_10BIT,
+ OV9281_PIXEL_RATE_10BIT, 1,
+ OV9281_PIXEL_RATE_10BIT);
h_blank = mode->hts_def - mode->width;
ov9281->hblank = v4l2_ctrl_new_std(handler, NULL, V4L2_CID_HBLANK,
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