Hi Ezequiel,
As mentioned in irc: run v4l2-compliance -s and v4l2-compliance -f.
I quickly tried it and v4l2-compliance fails:
Test input 0:
Control ioctls:
test VIDIOC_QUERY_EXT_CTRL/QUERYMENU: OK
test VIDIOC_QUERYCTRL: OK
test VIDIOC_G/S_CTRL: OK
test VIDIOC_G/S/TRY_EXT_CTRLS: OK
test VIDIOC_(UN)SUBSCRIBE_EVENT/DQEVENT: OK
test VIDIOC_G/S_JPEGCOMP: OK (Not Supported)
Standard Controls: 7 Private Controls: 0
Format ioctls:
test VIDIOC_ENUM_FMT/FRAMESIZES/FRAMEINTERVALS: OK
test VIDIOC_G/S_PARM: OK
test VIDIOC_G_FBUF: OK (Not Supported)
test VIDIOC_G_FMT: OK
fail: v4l2-test-formats.cpp(422): !pix.width || !pix.height
fail: v4l2-test-formats.cpp(726): Video Capture is valid, but TRY_FMT failed to return a format
test VIDIOC_TRY_FMT: FAIL
fail: v4l2-test-formats.cpp(422): !pix.width || !pix.height
fail: v4l2-test-formats.cpp(942): Video Capture is valid, but no S_FMT was implemented
test VIDIOC_S_FMT: FAIL
test VIDIOC_G_SLICED_VBI_CAP: OK (Not Supported)
test Cropping: OK (Not Supported)
test Composing: OK (Not Supported)
and it ends with a segfault and this in the kernel log:
[ 180.135178] stk1160: width 720, height 480
[ 180.135187] stk1160: width 0, height 0
[ 180.135240] stk1160: width 0, height 0
[ 180.135317] stk1160: decimate 0x1f, column units -721, row units -481
[ 180.135450] stk1160: width 1, height 1
[ 180.135524] stk1160: decimate 0x1f, column units 719, row units 479
[ 180.135572] stk1160: width 720, height 480
[ 180.135701] stk1160: decimate 0x10, column units 0, row units 0
[ 180.135750] divide error: 0000 [#1] PREEMPT SMP
[ 180.135773] Modules linked in: stk1160 ivtv_alsa tuner_simple tuner_types tda9887 tda8290 tuner msp3400 saa7127 ivtv saa7115 videobuf2_vmalloc tveeprom videobuf2_memops videobuf2_core cx2341x v4l2_common videodev media x86_pkg_temp_thermal processor button [last unloaded: stk1160]
[ 180.135851] CPU: 2 PID: 7391 Comm: v4l2-compliance Not tainted 4.1.0-rc3-koryphon #837
[ 180.135862] Hardware name: ASUSTeK COMPUTER INC. Z10PA-U8 Series/Z10PA-U8 Series, BIOS 0303 11/20/2014
[ 180.135873] task: ffff8810364b1830 ti: ffff88100c794000 task.ti: ffff88100c794000
[ 180.135882] RIP: 0010:[<ffffffffa003ed9a>] [<ffffffffa003ed9a>] stk1160_try_fmt.isra.5+0x1ba/0x1e0 [stk1160]
[ 180.135902] RSP: 0018:ffff88100c797bd8 EFLAGS: 00010202
[ 180.135910] RAX: 00000000000002d0 RBX: 0000000000000000 RCX: ffff88100c797c14
[ 180.135918] RDX: 0000000000000000 RSI: ffff8810364107c0 RDI: 00000000000001e0
[ 180.135927] RBP: ffff88100c797bf8 R08: ffff881036537500 R09: 00000000000001e0
[ 180.135939] R10: 0000000000000000 R11: 0000000000000005 R12: 0000000000000000
[ 180.135948] R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
[ 180.135958] FS: 00007f7acbad8740(0000) GS:ffff88107fc80000(0000) knlGS:0000000000000000
[ 180.135968] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 180.135975] CR2: 00007faa881e4148 CR3: 000000102974d000 CR4: 00000000001406e0
[ 180.135984] Stack:
[ 180.136003] ffff881036410000 0000000000000000 ffff881036537500 ffff881036536c00
[ 180.136018] ffff88100c797c48 ffffffffa003ee4b ffff88100c797c58 ffff000081a0dbc2
[ 180.136033] 0000000100000001 0000000000000000 ffff88100c797c48 ffff881036537500
[ 180.136048] Call Trace:
[ 180.136057] [<ffffffffa003ee4b>] vidioc_s_fmt_vid_cap+0x4b/0xf0 [stk1160]
[ 180.136073] [<ffffffffa074e163>] v4l_s_fmt+0x123/0x490 [videodev]
[ 180.136086] [<ffffffffa074d294>] __video_do_ioctl+0x274/0x310 [videodev]
[ 180.136099] [<ffffffffa074ee4a>] ? video_usercopy+0x2fa/0x4c0 [videodev]
[ 180.136111] [<ffffffffa074ee86>] video_usercopy+0x336/0x4c0 [videodev]
[ 180.136122] [<ffffffffa074d020>] ? v4l_querycap+0x60/0x60 [videodev]
[ 180.136135] [<ffffffff813dea63>] ? __this_cpu_preempt_check+0x13/0x20
[ 180.136146] [<ffffffff810d325f>] ? __srcu_read_lock+0x5f/0xa0
[ 180.136157] [<ffffffffa074f020>] video_ioctl2+0x10/0x20 [videodev]
[ 180.136168] [<ffffffffa07486a0>] v4l2_ioctl+0xd0/0xf0 [videodev]
[ 180.136179] [<ffffffff8118fc60>] do_vfs_ioctl+0x2e0/0x4e0
[ 180.136187] [<ffffffff8117bccc>] ? vfs_write+0x14c/0x1b0
[ 180.136196] [<ffffffff8118fee1>] SyS_ioctl+0x81/0xa0
[ 180.136208] [<ffffffff81a1266e>] system_call_fastpath+0x12/0x71
[ 180.136216] Code: 31 d2 41 89 c1 41 89 40 0c e9 d0 fe ff ff 0f 1f 00 44 89 d0 41 be 01 00 00 00 45 31 ed c1 e8 1f 44 01 d0 d1 f8 05 d0 02 00 00 99 <41> f7 fa 31 d2 41 89 c2 44 8d 60 ff b8 d0 02 00 00 41 f7 f2 41
[ 180.136354] RIP [<ffffffffa003ed9a>] stk1160_try_fmt.isra.5+0x1ba/0x1e0 [stk1160]
[ 180.136366] RSP <ffff88100c797bd8>
[ 180.139977] ---[ end trace a699ade0cf2b43de ]---
So this needs a bit more work... Remember: v4l2-compliance is your friend! :-)
I didn't review the patch, this should be fixed first.
BTW, I noticed that this driver is logging a lot in the kernel log. Normal
operation of a driver shouldn't log anything, so can you fix this while you're
at it?
Thanks,
Hans
On 05/29/2015 12:19 AM, Ezequiel Garcia wrote:
> This commit implements frame decimation for stk1160, which allows
> to support format changes instead of a static frame size.
>
> The stk1160 supports independent row and column decimation, in two
> different modes:
> * set a number of rows/columns units to skip for each unit sent.
> * set a number of rows/columns units to send for each unit skipped.
>
> This effectively allows to achieve different frame scaling ratios.
>
> The unit number can be set to either two row/columns sent/skipped,
> or four row/columns sent/skipped. Since the video format (UYVY)
> has 4-bytes, using a unit number of two row/columns, results
> in frame color 'shifting'.
>
> Signed-off-by: Michael Stegemann <michael@xxxxxxxxxxxx>
> Signed-off-by: Dale Hamel <dale.hamel@xxxxxxxxxx>
> Signed-off-by: Ezequiel Garcia <ezequiel@xxxxxxxxxxxxxxxxxxxx>
> ---
> drivers/media/usb/stk1160/stk1160-reg.h | 34 ++++++
> drivers/media/usb/stk1160/stk1160-v4l.c | 178 +++++++++++++++++++++++++++-----
> 2 files changed, 184 insertions(+), 28 deletions(-)
>
> diff --git a/drivers/media/usb/stk1160/stk1160-reg.h b/drivers/media/usb/stk1160/stk1160-reg.h
> index 3e49da6..81ff3a1 100644
> --- a/drivers/media/usb/stk1160/stk1160-reg.h
> +++ b/drivers/media/usb/stk1160/stk1160-reg.h
> @@ -33,6 +33,40 @@
> */
> #define STK1160_DCTRL 0x100
>
> +/*
> + * Decimation Control Register:
> + * Byte 104: Horizontal Decimation Line Unit Count
> + * Byte 105: Vertical Decimation Line Unit Count
> + * Byte 106: Decimation Control
> + * Bit 0 - Horizontal Decimation Control
> + * 0 Horizontal decimation is disabled.
> + * 1 Horizontal decimation is enabled.
> + * Bit 1 - Decimates Half or More Column
> + * 0 Decimates less than half from original column,
> + * send count unit (0x105) before each unit skipped.
> + * 1 Decimates half or more from original column,
> + * skip count unit (0x105) before each unit sent.
> + * Bit 2 - Vertical Decimation Control
> + * 0 Vertical decimation is disabled.
> + * 1 Vertical decimation is enabled.
> + * Bit 3 - Vertical Greater or Equal to Half
> + * 0 Decimates less than half from original row,
> + * send count unit (0x105) before each unit skipped.
> + * 1 Decimates half or more from original row,
> + * skip count unit (0x105) before each unit sent.
> + * Bit 4 - Decimation Unit
> + * 0 Decimation will work with 2 rows or columns per unit.
> + * 1 Decimation will work with 4 rows or columns per unit.
> + */
> +#define STK1160_DMCTRL_H_UNITS 0x104
> +#define STK1160_DMCTRL_V_UNITS 0x105
> +#define STK1160_DMCTRL 0x106
> +#define STK1160_H_DEC_EN BIT(0)
> +#define STK1160_H_DEC_MODE BIT(1)
> +#define STK1160_V_DEC_EN BIT(2)
> +#define STK1160_V_DEC_MODE BIT(3)
> +#define STK1160_DEC_UNIT_SIZE BIT(4)
> +
> /* Capture Frame Start Position */
> #define STK116_CFSPO 0x110
> #define STK116_CFSPO_STX_L 0x110
> diff --git a/drivers/media/usb/stk1160/stk1160-v4l.c b/drivers/media/usb/stk1160/stk1160-v4l.c
> index 749ad56..5b0a3ac 100644
> --- a/drivers/media/usb/stk1160/stk1160-v4l.c
> +++ b/drivers/media/usb/stk1160/stk1160-v4l.c
> @@ -42,6 +42,17 @@ static bool keep_buffers;
> module_param(keep_buffers, bool, 0644);
> MODULE_PARM_DESC(keep_buffers, "don't release buffers upon stop streaming");
>
> +enum stk1160_decimate_mode {
> + STK1160_DECIMATE_MORE_THAN_HALF,
> + STK1160_DECIMATE_LESS_THAN_HALF,
> +};
> +
> +struct stk1160_decimate_ctrl {
> + bool col_en, row_en;
> + enum stk1160_decimate_mode col_mode, row_mode;
> + unsigned int col_n, row_n;
> +};
> +
> /* supported video standards */
> static struct stk1160_fmt format[] = {
> {
> @@ -106,6 +117,37 @@ static void stk1160_set_std(struct stk1160 *dev)
>
> }
>
> +static void stk1160_set_fmt(struct stk1160 *dev,
> + struct stk1160_decimate_ctrl *ctrl)
> +{
> + u32 val = 0;
> +
> + if (ctrl) {
> + /*
> + * Since the format is UYVY, the device must skip or send
> + * a number of rows/columns multiple of four. This way, the
> + * colour format is preserved. The STK1160_DEC_UNIT_SIZE bit
> + * does exactly this.
> + */
> + val |= STK1160_DEC_UNIT_SIZE;
> + val |= ctrl->col_en ? STK1160_H_DEC_EN : 0;
> + val |= ctrl->row_en ? STK1160_V_DEC_EN : 0;
> + val |= ctrl->col_mode == STK1160_DECIMATE_MORE_THAN_HALF ? STK1160_H_DEC_MODE : 0;
> + val |= ctrl->row_mode == STK1160_DECIMATE_MORE_THAN_HALF ? STK1160_V_DEC_MODE : 0;
> +
> + /* Horizontal count units */
> + stk1160_write_reg(dev, STK1160_DMCTRL_H_UNITS, ctrl->col_n);
> + /* Vertical count units */
> + stk1160_write_reg(dev, STK1160_DMCTRL_V_UNITS, ctrl->row_n);
> +
> + stk1160_dbg("decimate 0x%x, column units %d, row units %d\n",
> + val, ctrl->col_n, ctrl->row_n);
> + }
> +
> + /* Decimation control */
> + stk1160_write_reg(dev, STK1160_DMCTRL, val);
> +}
> +
> /*
> * Set a new alternate setting.
> * Returns true is dev->max_pkt_size has changed, false otherwise.
> @@ -321,26 +363,111 @@ static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
> return 0;
> }
>
> -static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
> - struct v4l2_format *f)
> +static void stk1160_try_fmt(struct stk1160 *dev, struct v4l2_format *f,
> + struct stk1160_decimate_ctrl *ctrl)
> {
> - struct stk1160 *dev = video_drvdata(file);
> + int height = f->fmt.pix.height;
> + int width = f->fmt.pix.width;
> + int base_width, base_height;
> + unsigned int col_n, row_n;
> + enum stk1160_decimate_mode col_mode, row_mode;
> + bool col_en, row_en;
> +
> + base_width = 720;
> + base_height = (dev->norm & V4L2_STD_525_60) ? 480 : 576;
> +
> + if (width >= base_width) {
> + col_en = false;
> + col_mode = STK1160_DECIMATE_LESS_THAN_HALF;
> + col_n = 0;
> + f->fmt.pix.width = base_width;
> + } else if (width > base_width / 2) {
> + /*
> + * The device will send count units for each
> + * unit skipped. This means count unit is:
> + *
> + * n = width / (frame width - width)
> + *
> + * And the width is:
> + *
> + * width = (n / n + 1) * frame width
> + */
> + col_en = true;
> + col_mode = STK1160_DECIMATE_LESS_THAN_HALF;
> + col_n = DIV_ROUND_CLOSEST(width, base_width - width);
> + f->fmt.pix.width = (base_width * col_n) / (col_n + 1);
>
> - /*
> - * User can't choose size at his own will,
> - * so we just return him the current size chosen
> - * at standard selection.
> - * TODO: Implement frame scaling?
> - */
> + } else if (width <= base_width / 2) {
> +
> + /*
> + * The device will skip count units for each
> + * unit sent. This means count is:
> + *
> + * n = (frame width / width) - 1
> + *
> + * And the width is:
> + *
> + * width = frame width / (n + 1)
> + */
> + col_en = true;
> + col_mode = STK1160_DECIMATE_MORE_THAN_HALF;
> + col_n = DIV_ROUND_CLOSEST(base_width, width) - 1;
> + f->fmt.pix.width = base_width / (col_n + 1);
> + } else {
> + col_en = false;
> + col_mode = STK1160_DECIMATE_LESS_THAN_HALF;
> + col_n = 0;
> + f->fmt.pix.width = base_width;
> + }
> +
> + if (height >= base_height) {
> + row_en = false;
> + row_mode = STK1160_DECIMATE_LESS_THAN_HALF;
> + row_n = 0;
> + f->fmt.pix.height = base_height;
> + } else if (height > base_height / 2) {
> + row_en = true;
> + row_mode = STK1160_DECIMATE_LESS_THAN_HALF;
> + row_n = DIV_ROUND_CLOSEST(height, base_height - height);
> + f->fmt.pix.height = (base_height * row_n) / (row_n + 1);
> +
> + } else if (height <= base_height / 2) {
> + row_en = true;
> + row_mode = STK1160_DECIMATE_MORE_THAN_HALF;
> + row_n = DIV_ROUND_CLOSEST(base_height, height) - 1;
> + f->fmt.pix.height = base_height / (row_n + 1);
> + } else {
> + row_en = false;
> + row_mode = STK1160_DECIMATE_LESS_THAN_HALF;
> + row_n = 0;
> + f->fmt.pix.height = base_height;
> + }
>
> f->fmt.pix.pixelformat = dev->fmt->fourcc;
> - f->fmt.pix.width = dev->width;
> - f->fmt.pix.height = dev->height;
> f->fmt.pix.field = V4L2_FIELD_INTERLACED;
> - f->fmt.pix.bytesperline = dev->width * 2;
> - f->fmt.pix.sizeimage = dev->height * f->fmt.pix.bytesperline;
> + f->fmt.pix.bytesperline = f->fmt.pix.width * 2;
> + f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
> f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
>
> + if (ctrl) {
> + ctrl->col_en = col_en;
> + ctrl->col_n = col_n;
> + ctrl->col_mode = col_mode;
> + ctrl->row_en = row_en;
> + ctrl->row_n = row_n;
> + ctrl->row_mode = row_mode;
> + }
> +
> + stk1160_dbg("width %d, height %d\n",
> + f->fmt.pix.width, f->fmt.pix.height);
> +}
> +
> +static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
> + struct v4l2_format *f)
> +{
> + struct stk1160 *dev = video_drvdata(file);
> +
> + stk1160_try_fmt(dev, f, NULL);
> return 0;
> }
>
> @@ -349,13 +476,15 @@ static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
> {
> struct stk1160 *dev = video_drvdata(file);
> struct vb2_queue *q = &dev->vb_vidq;
> + struct stk1160_decimate_ctrl ctrl;
>
> if (vb2_is_busy(q))
> return -EBUSY;
>
> - vidioc_try_fmt_vid_cap(file, priv, f);
> -
> - /* We don't support any format changes */
> + stk1160_try_fmt(dev, f, &ctrl);
> + dev->width = f->fmt.pix.width;
> + dev->height = f->fmt.pix.height;
> + stk1160_set_fmt(dev, &ctrl);
>
> return 0;
> }
> @@ -391,22 +520,15 @@ static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id norm)
> return -ENODEV;
>
> /* We need to set this now, before we call stk1160_set_std */
> + dev->width = 720;
> + dev->height = (norm & V4L2_STD_525_60) ? 480 : 576;
> dev->norm = norm;
>
> - /* This is taken from saa7115 video decoder */
> - if (dev->norm & V4L2_STD_525_60) {
> - dev->width = 720;
> - dev->height = 480;
> - } else if (dev->norm & V4L2_STD_625_50) {
> - dev->width = 720;
> - dev->height = 576;
> - } else {
> - stk1160_err("invalid standard\n");
> - return -EINVAL;
> - }
> -
> stk1160_set_std(dev);
>
> + /* Calling with NULL disables frame decimation */
> + stk1160_set_fmt(dev, NULL);
> +
> v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_std,
> dev->norm);
>
>
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