by jacopo mondi

[permalink] [raw]

Subject: Re: [PATCH v5 05/13] media: atmel: atmel-sama5d2-isc: fix wrong mask in YUYV format check

Hi Eugen

On Thu, Feb 17, 2022 at 03:56:37PM +0200, Eugen Hristev wrote:
> While this does not happen in production, this check should be done
> versus the mask, as checking with the YCYC value may not include
> some bits that may be set.
> Is it correct and safe to check the whole mask.
>
> Fixes: 123aaf816b95 ("media: atmel: atmel-sama5d2-isc: fix YUYV format")
> Signed-off-by: Eugen Hristev <[email protected]>

I trust this
Reviewed-by: Jacopo Mondi <[email protected]>

Thanks
j
> ---
> drivers/media/platform/atmel/atmel-sama5d2-isc.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/media/platform/atmel/atmel-sama5d2-isc.c b/drivers/media/platform/atmel/atmel-sama5d2-isc.c
> index c244682ea22f..025c3e8a7e95 100644
> --- a/drivers/media/platform/atmel/atmel-sama5d2-isc.c
> +++ b/drivers/media/platform/atmel/atmel-sama5d2-isc.c
> @@ -291,7 +291,7 @@ static void isc_sama5d2_config_rlp(struct isc_device *isc)
> * Thus, if the YCYC mode is selected, replace it with the
> * sama5d2-compliant mode which is YYCC .
> */
> - if ((rlp_mode & ISC_RLP_CFG_MODE_YCYC) == ISC_RLP_CFG_MODE_YCYC) {
> + if ((rlp_mode & ISC_RLP_CFG_MODE_MASK) == ISC_RLP_CFG_MODE_YCYC) {
> rlp_mode &= ~ISC_RLP_CFG_MODE_MASK;
> rlp_mode |= ISC_RLP_CFG_MODE_YYCC;
> }
> --
> 2.25.1
>

2022-03-03 17:55:11

by Eugen Hristev

[permalink] [raw]

Subject: Re: [PATCH v5 08/13] media: atmel: atmel-isc: change format propagation to subdev into only verification

On 2/23/22 7:03 PM, Jacopo Mondi wrote:
> Hi Eugen
>
> On Thu, Feb 17, 2022 at 03:56:40PM +0200, Eugen Hristev wrote:
>> As a top MC video driver, the atmel-isc should not propagate the format to the
>> subdevice.
>> It should rather check at start_streaming() time if the subdev is properly
>> configured with a compatible format.
>> Removed the whole format finding logic, and reworked the format verification
>> at start_streaming time, such that the ISC will return an error if the subdevice
>> is not properly configured. To achieve this, media_pipeline_start
>> is called and a link_validate callback is created to check the formats.
>> With this being done, the module parameter 'sensor_preferred' makes no sense
>> anymore. The ISC should not decide which format the sensor is using. The
>> ISC should only cope with the situation and inform userspace if the streaming
>> is possible in the current configuration.
>> The redesign of the format propagation has also risen the question of the
>> enumfmt callback. If enumfmt is called with an mbus_code, the enumfmt handler
>> should only return the formats that are supported for this mbus_code.
>> Otherwise, the enumfmt will report all the formats that the ISC could output.
>> With this rework, the dynamic list of user formats is removed. It makes no
>> more sense to identify at complete time which formats the sensor could emit,
>> and add those into a separate dynamic list.
>> The ISC will start with a simple preconfigured default format, and at
>> link validate time, decide whether it can use the format that is configured
>> on the sink or not.
>>
>> Signed-off-by: Eugen Hristev <[email protected]>
>> ---
>> Changes in v5:
>> - removed user_formats dynamic list as it is now pointless
>> - greatly simplified the enum_fmt function
>> - removed some init code that was useless now
>>
>> Changes in v4:
>> - moved validation code into link_validate and used media_pipeline_start
>> - merged this patch with the enum_fmt patch which was previously in v3 of
>> the series
>>
>> Changes in v3:
>> - clamp to maximum resolution once the frame size from the subdev is found
>>
>> drivers/media/platform/atmel/atmel-isc-base.c | 427 ++++++++----------
>> .../media/platform/atmel/atmel-isc-scaler.c | 5 +
>> drivers/media/platform/atmel/atmel-isc.h | 13 +-
>> .../media/platform/atmel/atmel-sama5d2-isc.c | 20 +
>> .../media/platform/atmel/atmel-sama7g5-isc.c | 20 +
>> 5 files changed, 244 insertions(+), 241 deletions(-)
>>
>> diff --git a/drivers/media/platform/atmel/atmel-isc-base.c b/drivers/media/platform/atmel/atmel-isc-base.c
>> index 37c59bb4dc18..1a079ed9608d 100644
>> --- a/drivers/media/platform/atmel/atmel-isc-base.c
>> +++ b/drivers/media/platform/atmel/atmel-isc-base.c
>> @@ -36,11 +36,6 @@ static unsigned int debug;
>> module_param(debug, int, 0644);
>> MODULE_PARM_DESC(debug, "debug level (0-2)");
>>
>> -static unsigned int sensor_preferred = 1;
>> -module_param(sensor_preferred, uint, 0644);
>> -MODULE_PARM_DESC(sensor_preferred,
>> - "Sensor is preferred to output the specified format (1-on 0-off), default 1");
>> -
>> #define ISC_IS_FORMAT_RAW(mbus_code) \
>> (((mbus_code) & 0xf000) == 0x3000)
>>
>> @@ -337,6 +332,10 @@ static int isc_start_streaming(struct vb2_queue *vq, unsigned int count)
>> unsigned long flags;
>> int ret;
>>
>> + ret = media_pipeline_start(&isc->video_dev.entity, &isc->mpipe);
>> + if (ret)
>> + goto err_pipeline_start;
>> +
>> /* Enable stream on the sub device */
>> ret = v4l2_subdev_call(isc->current_subdev->sd, video, s_stream, 1);
>> if (ret && ret != -ENOIOCTLCMD) {
>> @@ -385,6 +384,9 @@ static int isc_start_streaming(struct vb2_queue *vq, unsigned int count)
>> v4l2_subdev_call(isc->current_subdev->sd, video, s_stream, 0);
>>
>> err_start_stream:
>> + media_pipeline_stop(&isc->video_dev.entity);
>> +
>> +err_pipeline_start:
>> spin_lock_irqsave(&isc->dma_queue_lock, flags);
>> list_for_each_entry(buf, &isc->dma_queue, list)
>> vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
>> @@ -423,6 +425,9 @@ static void isc_stop_streaming(struct vb2_queue *vq)
>> if (ret && ret != -ENOIOCTLCMD)
>> v4l2_err(&isc->v4l2_dev, "stream off failed in subdev\n");
>>
>> + /* Stop media pipeline */
>> + media_pipeline_stop(&isc->video_dev.entity);
>> +
>> /* Release all active buffers */
>> spin_lock_irqsave(&isc->dma_queue_lock, flags);
>> if (unlikely(isc->cur_frm)) {
>> @@ -453,22 +458,6 @@ static void isc_buffer_queue(struct vb2_buffer *vb)
>> spin_unlock_irqrestore(&isc->dma_queue_lock, flags);
>> }
>>
>> -static struct isc_format *find_format_by_fourcc(struct isc_device *isc,
>> - unsigned int fourcc)
>> -{
>> - unsigned int num_formats = isc->num_user_formats;
>> - struct isc_format *fmt;
>> - unsigned int i;
>> -
>> - for (i = 0; i < num_formats; i++) {
>> - fmt = isc->user_formats[i];
>> - if (fmt->fourcc == fourcc)
>> - return fmt;
>> - }
>> -
>> - return NULL;
>> -}
>> -
>> static const struct vb2_ops isc_vb2_ops = {
>> .queue_setup = isc_queue_setup,
>> .wait_prepare = vb2_ops_wait_prepare,
>> @@ -498,28 +487,63 @@ static int isc_enum_fmt_vid_cap(struct file *file, void *priv,
>> struct isc_device *isc = video_drvdata(file);
>> u32 index = f->index;
>> u32 i, supported_index;
>> + struct isc_format *fmt;
>>
>> - if (index < isc->controller_formats_size) {
>> - f->pixelformat = isc->controller_formats[index].fourcc;
>> - return 0;
>> - }
>> -
>> - index -= isc->controller_formats_size;
>> -
>> - supported_index = 0;
>
> You seem to have lost this one.
> You can initialize while declaring it
>
>> -
>> - for (i = 0; i < isc->formats_list_size; i++) {
>> - if (!ISC_IS_FORMAT_RAW(isc->formats_list[i].mbus_code) ||
>> - !isc->formats_list[i].sd_support)
>> - continue;
>> - if (supported_index == index) {
>> - f->pixelformat = isc->formats_list[i].fourcc;
>> + /*
>> + * If a specific mbus_code is requested, check if we support
>> + * this mbus_code as input for the ISC first.
>> + * If it's supported, then we report the corresponding pixelformat
>> + * as first possible option for the ISC.
>> + * E.g. mbus MEDIA_BUS_FMT_SGBRG12_1X12 and report
>
> Is this a good example, since you check for RAW in a separate loop ?
>
>> + * 'GB12' (12-bit Bayer GBGB/RGRG)
>> + */
>> + if (f->mbus_code) {
>> + fmt = isc_find_format_by_code(isc, f->mbus_code, &i);
>> + if (!fmt)
>> + return -EINVAL;
>> + if (index == supported_index) {
>> + f->pixelformat = fmt->fourcc;
>> return 0;
>> }
>
> Not sure I get this. Are there multiple pixel formats associated with
> a non-RAW mbus_code ? If not, your isc_find_format_by_code() call will always
> return a single pixelformat per mbus_code, so there is no need to
> check with supported index. If the ISC cannot convert between
> colorspaces (ie not YUYV->RGB) I think it would be easier to check for
> RAW first and enumerate all the non-RAW pixfmt the ISC can generate
> from RAW, then if mbus_code is non RAW just check if it's in the list
> of supported formats and return the corresponding pixfmt. Or can the
> ISC conver between different colorspaces and I didn't get this ?
>
>> supported_index++;
>> }
>>
>> - return -EINVAL;
>> + /*
>> + * We are asked for a specific mbus code, which is raw.
>> + * We have to search through the formats we can convert to.
>> + * We have to skip the raw formats, we cannot convert to raw.
>> + * E.g. 'AR12' (16-bit ARGB 4-4-4-4), 'AR15' (16-bit ARGB 1-5-5-5), etc.
>> + */
>> + if (f->mbus_code && ISC_IS_FORMAT_RAW(f->mbus_code)) {
>
> Won't this be hijacked by the previous loop ?
>
> if (f->mbus_code) {
>
> }
>
> if (f->mbus_code && ISC_IS_FORMAT_RAW(f->mbus_code)) {
>
> }
>
>> + for (i = 0; i < isc->controller_formats_size; i++)
>> + if (!isc->controller_formats[i].raw) {
>
> if (isc->controller_format[i].raw)
> continue;
>
> To save an indentation level
>
>> + if (index == supported_index) {
>
> Should supported_index be re-initialized before this loop ?
>
>> + f->pixelformat =
>> + isc->controller_formats[i].fourcc;
>
> You are enumerating -all- formats except RAW, right ?
> This mean you can convert RAW to all other formats ?
>
>> + return 0;
>> + }
>> + supported_index++;
>> + }
>> + }
>> +
>> + /*
>> + * If we are asked a specific mbus_code, we have no more formats to
>> + * report
>> + * e.g. if the format is not raw, we cannot do any more processing.
>> + */
>> + if (f->mbus_code)
>> + return -EINVAL;
>
> As suggested, if my understanding is correct, I would enumerate all
> formats generated from a RAW mbus_code. If the mbus_code is not RAW
> then look if it's supported with isc_find_format_by_code() (and only
> index==0 is valid, unless there will be multiple entries with the same
> mbus_code in your format list, but isc_find_format_by_code() doesn't
> seem to support that).

Hi Jacopo,

I reworked this code using your suggestions.

Basically, I want to have three cases:
1/ input non-RAW (YUYV, RGB565) -> can output the same format, and be
done with it.
2/ input Raw -> enum all possible formats, but not all the Raw formats,
only the corresponding one.
3/ no input -> output all formats that we can output

You can have a look in v6 that I will send soon to cover these cases,
basically in the following form:

case 1: if we are not asking a specific mbus code, list everything we
support as output:

# v4l2-ctl -d /dev/video0 --list-formats-ext
ioctl: VIDIOC_ENUM_FMT
Type: Video Capture

[0]: 'AR12' (16-bit ARGB 4-4-4-4)
Size: Continuous 16x16 - 3264x2464
[1]: 'AR15' (16-bit ARGB 1-5-5-5)
Size: Continuous 16x16 - 3264x2464
[2]: 'RGBP' (16-bit RGB 5-6-5)
Size: Continuous 16x16 - 3264x2464
[3]: 'AR24' (32-bit BGRA 8-8-8-8)
Size: Continuous 16x16 - 3264x2464
[4]: 'XR24' (32-bit BGRX 8-8-8-8)
Size: Continuous 16x16 - 3264x2464
[5]: 'YU12' (Planar YUV 4:2:0)
Size: Continuous 16x16 - 3264x2464
[6]: 'UYVY' (UYVY 4:2:2)
Size: Continuous 16x16 - 3264x2464
[7]: 'VYUY' (VYUY 4:2:2)
Size: Continuous 16x16 - 3264x2464
[8]: 'YUYV' (YUYV 4:2:2)
Size: Continuous 16x16 - 3264x2464
[9]: '422P' (Planar YUV 4:2:2)
Size: Continuous 16x16 - 3264x2464
[10]: 'GREY' (8-bit Greyscale)
Size: Continuous 16x16 - 3264x2464
[11]: 'Y10 ' (10-bit Greyscale)
Size: Continuous 16x16 - 3264x2464
[12]: 'Y16 ' (16-bit Greyscale)
Size: Continuous 16x16 - 3264x2464
[13]: 'BA81' (8-bit Bayer BGBG/GRGR)
Size: Continuous 16x16 - 3264x2464
[14]: 'GBRG' (8-bit Bayer GBGB/RGRG)
Size: Continuous 16x16 - 3264x2464
[15]: 'GRBG' (8-bit Bayer GRGR/BGBG)
Size: Continuous 16x16 - 3264x2464
[16]: 'RGGB' (8-bit Bayer RGRG/GBGB)
Size: Continuous 16x16 - 3264x2464
[17]: 'BG10' (10-bit Bayer BGBG/GRGR)
Size: Continuous 16x16 - 3264x2464
[18]: 'GB10' (10-bit Bayer GBGB/RGRG)
Size: Continuous 16x16 - 3264x2464
[19]: 'BA10' (10-bit Bayer GRGR/BGBG)
Size: Continuous 16x16 - 3264x2464
[20]: 'RG10' (10-bit Bayer RGRG/GBGB)
Size: Continuous 16x16 - 3264x2464
[21]: 'BG12' (12-bit Bayer BGBG/GRGR)
Size: Continuous 16x16 - 3264x2464
[22]: 'GB12' (12-bit Bayer GBGB/RGRG)
Size: Continuous 16x16 - 3264x2464
[23]: 'BA12' (12-bit Bayer GRGR/BGBG)
Size: Continuous 16x16 - 3264x2464
[24]: 'RG12' (12-bit Bayer RGRG/GBGB)
Size: Continuous 16x16 - 3264x2464

case 2: if we are asked a specific mbus, but non-raw: search the
corresponding format with isc_find_format_by_code (which still has to
return NULL in case it's not supported, such that we can advertise
nothing ): (e.g. 0x2007 is not supported at all )

# v4l2-ctl -d /dev/video0 --list-formats-ext 0x2008
ioctl: VIDIOC_ENUM_FMT
Type: Video Capture

[0]: 'YUYV' (YUYV 4:2:2)
Size: Continuous 16x16 - 3264x2464
# v4l2-ctl -d /dev/video0 --list-formats-ext 0x2007
ioctl: VIDIOC_ENUM_FMT
Type: Video Capture

#

case 3: if we are asked a specific mbus, but raw: search the
corresponding format with isc_find_format_by_code , to find exactly
which corresponding raw format we have to advertise, and then, advertise
all the non-raw formats , because we can convert from RAW to everything
else:

# v4l2-ctl -d /dev/video0 --list-formats-ext 0x3001
ioctl: VIDIOC_ENUM_FMT
Type: Video Capture

[0]: 'BA81' (8-bit Bayer BGBG/GRGR)
Size: Continuous 16x16 - 3264x2464
[1]: 'AR12' (16-bit ARGB 4-4-4-4)
Size: Continuous 16x16 - 3264x2464
[2]: 'AR15' (16-bit ARGB 1-5-5-5)
Size: Continuous 16x16 - 3264x2464
[3]: 'RGBP' (16-bit RGB 5-6-5)
Size: Continuous 16x16 - 3264x2464
[4]: 'AR24' (32-bit BGRA 8-8-8-8)
Size: Continuous 16x16 - 3264x2464
[5]: 'XR24' (32-bit BGRX 8-8-8-8)
Size: Continuous 16x16 - 3264x2464
[6]: 'YU12' (Planar YUV 4:2:0)
Size: Continuous 16x16 - 3264x2464
[7]: 'UYVY' (UYVY 4:2:2)
Size: Continuous 16x16 - 3264x2464
[8]: 'VYUY' (VYUY 4:2:2)
Size: Continuous 16x16 - 3264x2464
[9]: 'YUYV' (YUYV 4:2:2)
Size: Continuous 16x16 - 3264x2464
[10]: '422P' (Planar YUV 4:2:2)
Size: Continuous 16x16 - 3264x2464
[11]: 'GREY' (8-bit Greyscale)
Size: Continuous 16x16 - 3264x2464
[12]: 'Y10 ' (10-bit Greyscale)
Size: Continuous 16x16 - 3264x2464
[13]: 'Y16 ' (16-bit Greyscale)
Size: Continuous 16x16 - 3264x2464

>
>> +
>> + /*
>> + * And finally, without a specific mbus_code,
>> + * we have to report all our formats.
>> + */
>> + if (index >= isc->controller_formats_size)
>> + return -EINVAL;
>> +
>> + f->pixelformat = isc->controller_formats[index].fourcc;
>> +
>> + return 0;
>> }
>>
>> static int isc_g_fmt_vid_cap(struct file *file, void *priv,
>> @@ -584,20 +608,30 @@ static int isc_try_validate_formats(struct isc_device *isc)
>> break;
>> default:
>> /* any other different formats are not supported */
>> + v4l2_err(&isc->v4l2_dev, "Requested unsupported format.\n");
>> ret = -EINVAL;
>> }
>> v4l2_dbg(1, debug, &isc->v4l2_dev,
>> "Format validation, requested rgb=%u, yuv=%u, grey=%u, bayer=%u\n",
>> rgb, yuv, grey, bayer);
>>
>> - /* we cannot output RAW if we do not receive RAW */
>> - if ((bayer) && !ISC_IS_FORMAT_RAW(isc->try_config.sd_format->mbus_code))
>> + if (bayer &&
>> + !ISC_IS_FORMAT_RAW(isc->try_config.sd_format->mbus_code)) {
>> + v4l2_err(&isc->v4l2_dev, "Cannot output RAW if we do not receive RAW.\n");
>> return -EINVAL;
>> + }
>>
>> - /* we cannot output GREY if we do not receive RAW/GREY */
>> if (grey && !ISC_IS_FORMAT_RAW(isc->try_config.sd_format->mbus_code) &&
>> - !ISC_IS_FORMAT_GREY(isc->try_config.sd_format->mbus_code))
>> + !ISC_IS_FORMAT_GREY(isc->try_config.sd_format->mbus_code)) {
>> + v4l2_err(&isc->v4l2_dev, "Cannot output GREY if we do not receive RAW/GREY.\n");
>> return -EINVAL;
>> + }
>> +
>> + if ((rgb || bayer || yuv) &&
>> + ISC_IS_FORMAT_GREY(isc->try_config.sd_format->mbus_code)) {
>> + v4l2_err(&isc->v4l2_dev, "Cannot convert GREY to another format.\n");
>> + return -EINVAL;
>> + }
>>
>> return ret;
>> }
>> @@ -825,7 +859,7 @@ static void isc_try_fse(struct isc_device *isc,
>> * If we do not know yet which format the subdev is using, we cannot
>> * do anything.
>> */
>> - if (!isc->try_config.sd_format)
>> + if (!isc->config.sd_format)
>> return;
>>
>> fse.code = isc->try_config.sd_format->mbus_code;
>> @@ -846,180 +880,140 @@ static void isc_try_fse(struct isc_device *isc,
>> }
>> }
>>
>> -static int isc_try_fmt(struct isc_device *isc, struct v4l2_format *f,
>> - u32 *code)
>> +static int isc_try_fmt(struct isc_device *isc, struct v4l2_format *f)
>> {
>> - int i;
>> - struct isc_format *sd_fmt = NULL, *direct_fmt = NULL;
>> struct v4l2_pix_format *pixfmt = &f->fmt.pix;
>> - struct v4l2_subdev_pad_config pad_cfg = {};
>> - struct v4l2_subdev_state pad_state = {
>> - .pads = &pad_cfg
>> - };
>> - struct v4l2_subdev_format format = {
>> - .which = V4L2_SUBDEV_FORMAT_TRY,
>> - };
>> - u32 mbus_code;
>> - int ret;
>> - bool rlp_dma_direct_dump = false;
>> + unsigned int i;
>>
>> if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
>> return -EINVAL;
>>
>> - /* Step 1: find a RAW format that is supported */
>> - for (i = 0; i < isc->num_user_formats; i++) {
>> - if (ISC_IS_FORMAT_RAW(isc->user_formats[i]->mbus_code)) {
>> - sd_fmt = isc->user_formats[i];
>> + isc->try_config.fourcc = isc->controller_formats[0].fourcc;
>> +
>> + /* find if the format requested is supported */
>> + for (i = 0; i < isc->controller_formats_size; i++)
>> + if (isc->controller_formats[i].fourcc == pixfmt->pixelformat) {
>> + isc->try_config.fourcc = pixfmt->pixelformat;
>> break;
>> }
>> - }
>> - /* Step 2: We can continue with this RAW format, or we can look
>> - * for better: maybe sensor supports directly what we need.
>> - */
>> - direct_fmt = find_format_by_fourcc(isc, pixfmt->pixelformat);
>>
>> - /* Step 3: We have both. We decide given the module parameter which
>> - * one to use.
>> - */
>> - if (direct_fmt && sd_fmt && sensor_preferred)
>> - sd_fmt = direct_fmt;
>> -
>> - /* Step 4: we do not have RAW but we have a direct format. Use it. */
>> - if (direct_fmt && !sd_fmt)
>> - sd_fmt = direct_fmt;
>> -
>> - /* Step 5: if we are using a direct format, we need to package
>> - * everything as 8 bit data and just dump it
>> - */
>> - if (sd_fmt == direct_fmt)
>> - rlp_dma_direct_dump = true;
>> -
>> - /* Step 6: We have no format. This can happen if the userspace
>> - * requests some weird/invalid format.
>> - * In this case, default to whatever we have
>> - */
>> - if (!sd_fmt && !direct_fmt) {
>> - sd_fmt = isc->user_formats[isc->num_user_formats - 1];
>> - v4l2_dbg(1, debug, &isc->v4l2_dev,
>> - "Sensor not supporting %.4s, using %.4s\n",
>> - (char *)&pixfmt->pixelformat, (char *)&sd_fmt->fourcc);
>> - }
>> -
>> - if (!sd_fmt) {
>> - ret = -EINVAL;
>> - goto isc_try_fmt_err;
>> - }
>> -
>> - /* Step 7: Print out what we decided for debugging */
>> - v4l2_dbg(1, debug, &isc->v4l2_dev,
>> - "Preferring to have sensor using format %.4s\n",
>> - (char *)&sd_fmt->fourcc);
>> -
>> - /* Step 8: at this moment we decided which format the subdev will use */
>> - isc->try_config.sd_format = sd_fmt;
>> + isc_try_configure_rlp_dma(isc, false);
>>
>> /* Limit to Atmel ISC hardware capabilities */
>> - if (pixfmt->width > isc->max_width)
>> - pixfmt->width = isc->max_width;
>> - if (pixfmt->height > isc->max_height)
>> - pixfmt->height = isc->max_height;
>> -
>> - /*
>> - * The mbus format is the one the subdev outputs.
>> - * The pixels will be transferred in this format Sensor -> ISC
>> - */
>> - mbus_code = sd_fmt->mbus_code;
>> -
>> - /*
>> - * Validate formats. If the required format is not OK, default to raw.
>> - */
>> -
>> - isc->try_config.fourcc = pixfmt->pixelformat;
>> -
>> - if (isc_try_validate_formats(isc)) {
>> - pixfmt->pixelformat = isc->try_config.fourcc = sd_fmt->fourcc;
>> - /* Re-try to validate the new format */
>> - ret = isc_try_validate_formats(isc);
>> - if (ret)
>> - goto isc_try_fmt_err;
>> - }
>> -
>> - ret = isc_try_configure_rlp_dma(isc, rlp_dma_direct_dump);
>> - if (ret)
>> - goto isc_try_fmt_err;
>> -
>> - ret = isc_try_configure_pipeline(isc);
>> - if (ret)
>> - goto isc_try_fmt_err;
>> -
>> - /* Obtain frame sizes if possible to have crop requirements ready */
>> - isc_try_fse(isc, &pad_state);
>> -
>> - v4l2_fill_mbus_format(&format.format, pixfmt, mbus_code);
>> - ret = v4l2_subdev_call(isc->current_subdev->sd, pad, set_fmt,
>> - &pad_state, &format);
>> - if (ret < 0)
>> - goto isc_try_fmt_subdev_err;
>> -
>> - v4l2_fill_pix_format(pixfmt, &format.format);
>> + v4l_bound_align_image(&pixfmt->width, 16, isc->max_width, 0,
>> + &pixfmt->height, 16, isc->max_height, 0, 0);
>> + /* If we did not find the requested format, we will fallback here */
>> + pixfmt->pixelformat = isc->try_config.fourcc;
>> + pixfmt->colorspace = V4L2_COLORSPACE_SRGB;
>> + pixfmt->field = V4L2_FIELD_NONE;
>>
>> - /* Limit to Atmel ISC hardware capabilities */
>> - if (pixfmt->width > isc->max_width)
>> - pixfmt->width = isc->max_width;
>> - if (pixfmt->height > isc->max_height)
>> - pixfmt->height = isc->max_height;
>>
>> - pixfmt->field = V4L2_FIELD_NONE;
>> pixfmt->bytesperline = (pixfmt->width * isc->try_config.bpp_v4l2) >> 3;
>> pixfmt->sizeimage = ((pixfmt->width * isc->try_config.bpp) >> 3) *
>> pixfmt->height;
>>
>> - if (code)
>> - *code = mbus_code;
>> + isc->try_fmt = *f;
>>
>> return 0;
>> +}
>>
>> -isc_try_fmt_err:
>> - v4l2_err(&isc->v4l2_dev, "Could not find any possible format for a working pipeline\n");
>> -isc_try_fmt_subdev_err:
>> - memset(&isc->try_config, 0, sizeof(isc->try_config));
>> +static int isc_set_fmt(struct isc_device *isc, struct v4l2_format *f)
>> +{
>> + isc_try_fmt(isc, f);
>>
>> - return ret;
>> + /* make the try configuration active */
>> + isc->config = isc->try_config;
>> + isc->fmt = isc->try_fmt;
>> +
>> + v4l2_dbg(1, debug, &isc->v4l2_dev, "ISC set_fmt to %.4s @%dx%d\n",
>> + (char *)&f->fmt.pix.pixelformat,
>> + f->fmt.pix.width, f->fmt.pix.height);
>> +
>> + return 0;
>> }
>>
>> -static int isc_set_fmt(struct isc_device *isc, struct v4l2_format *f)
>> +static int isc_validate(struct isc_device *isc)
>> {
>> + int ret;
>> + int i;
>> + struct isc_format *sd_fmt = NULL;
>> + struct v4l2_pix_format *pixfmt = &isc->fmt.fmt.pix;
>> struct v4l2_subdev_format format = {
>> .which = V4L2_SUBDEV_FORMAT_ACTIVE,
>> + .pad = isc->remote_pad,
>> + };
>> + struct v4l2_subdev_pad_config pad_cfg = {};
>> + struct v4l2_subdev_state pad_state = {
>> + .pads = &pad_cfg,
>> };
>> - u32 mbus_code = 0;
>> - int ret;
>>
>> - ret = isc_try_fmt(isc, f, &mbus_code);
>> + /* Get current format from subdev */
>> + ret = v4l2_subdev_call(isc->current_subdev->sd, pad, get_fmt, NULL,
>> + &format);
>
> I think when v4l2_subdev_call_state_active() will land it will
> probably simplify calling the subdev driver operations.
>
>> if (ret)
>> return ret;
>>
>> - v4l2_fill_mbus_format(&format.format, &f->fmt.pix, mbus_code);
>> - ret = v4l2_subdev_call(isc->current_subdev->sd, pad,
>> - set_fmt, NULL, &format);
>> - if (ret < 0)
>> - return ret;
>> + /* Identify the subdev's format configuration */
>> + for (i = 0; i < isc->formats_list_size; i++)
>> + if (isc->formats_list[i].mbus_code == format.format.code) {
>> + sd_fmt = &isc->formats_list[i];
>> + break;
>> + }
>> +
>> + /* Check if the format is not supported */
>> + if (!sd_fmt) {
>> + v4l2_err(&isc->v4l2_dev,
>> + "Current subdevice is streaming a media bus code that is not supported 0x%x\n",
>> + format.format.code);
>> + return -EPIPE;
>> + }
>> +
>> + /* At this moment we know which format the subdev will use */
>> + isc->try_config.sd_format = sd_fmt;
>> +
>> + /* If the sensor is not RAW, we can only do a direct dump */
>> + if (!ISC_IS_FORMAT_RAW(isc->try_config.sd_format->mbus_code))
>> + isc_try_configure_rlp_dma(isc, true);
>
> This is done at try_format(). Is it intentionally repeated ?

Yes. It's reuse of that code, this time the second parameter is true,
because it's what I call a 'direct dump', e.g. YUYV directly to YUYV, no
processing.

>
>>
>> /* Limit to Atmel ISC hardware capabilities */
>> - if (f->fmt.pix.width > isc->max_width)
>> - f->fmt.pix.width = isc->max_width;
>> - if (f->fmt.pix.height > isc->max_height)
>> - f->fmt.pix.height = isc->max_height;
>> + v4l_bound_align_image(&format.format.width, 16, isc->max_width, 0,
>> + &format.format.height, 16, isc->max_height, 0, 0);
>>
>> - isc->fmt = *f;
>> + /* Check if the frame size is the same. Otherwise we may overflow */
>> + if (pixfmt->height != format.format.height ||
>> + pixfmt->width != format.format.width) {
>> + v4l2_err(&isc->v4l2_dev,
>> + "ISC not configured with the proper frame size: %dx%d\n",
>> + format.format.width, format.format.height);
>> + return -EPIPE;
>> + }
>> +
>> + v4l2_dbg(1, debug, &isc->v4l2_dev,
>> + "Identified subdev using format %.4s with %dx%d %d bpp\n",
>> + (char *)&sd_fmt->fourcc, pixfmt->width, pixfmt->height,
>> + isc->try_config.bpp);
>>
>> + /* Reset and restart AWB if the subdevice changed the format */
>> if (isc->try_config.sd_format && isc->config.sd_format &&
>> isc->try_config.sd_format != isc->config.sd_format) {
>> isc->ctrls.hist_stat = HIST_INIT;
>> isc_reset_awb_ctrls(isc);
>> isc_update_v4l2_ctrls(isc);
>> }
>> - /* make the try configuration active */
>> +
>> + /* Validate formats */
>> + ret = isc_try_validate_formats(isc);
>> + if (ret)
>> + return ret;
>> +
>> + /* Obtain frame sizes if possible to have crop requirements ready */
>> + isc_try_fse(isc, &pad_state);
>> +
>> + /* Configure ISC pipeline for the config */
>> + ret = isc_try_configure_pipeline(isc);
>> + if (ret)
>> + return ret;
>> +
>> isc->config = isc->try_config;
>>
>> v4l2_dbg(1, debug, &isc->v4l2_dev, "New ISC configuration in place\n");
>> @@ -1043,7 +1037,7 @@ static int isc_try_fmt_vid_cap(struct file *file, void *priv,
>> {
>> struct isc_device *isc = video_drvdata(file);
>>
>> - return isc_try_fmt(isc, f, NULL);
>> + return isc_try_fmt(isc, f);
>> }
>>
>> static int isc_enum_input(struct file *file, void *priv,
>> @@ -1098,10 +1092,6 @@ static int isc_enum_framesizes(struct file *file, void *fh,
>> if (fsize->index)
>> return -EINVAL;
>>
>> - for (i = 0; i < isc->num_user_formats; i++)
>> - if (isc->user_formats[i]->fourcc == fsize->pixel_format)
>> - ret = 0;
>> -
>> for (i = 0; i < isc->controller_formats_size; i++)
>> if (isc->controller_formats[i].fourcc == fsize->pixel_format)
>> ret = 0;
>> @@ -1782,52 +1772,6 @@ struct isc_format *isc_find_format_by_code(struct isc_device *isc,
>> }
>> EXPORT_SYMBOL_GPL(isc_find_format_by_code);
>>
>> -static int isc_formats_init(struct isc_device *isc)
>> -{
>> - struct isc_format *fmt;
>> - struct v4l2_subdev *subdev = isc->current_subdev->sd;
>> - unsigned int num_fmts, i, j;
>> - u32 list_size = isc->formats_list_size;
>> - struct v4l2_subdev_mbus_code_enum mbus_code = {
>> - .which = V4L2_SUBDEV_FORMAT_ACTIVE,
>> - };
>> -
>> - num_fmts = 0;
>> - while (!v4l2_subdev_call(subdev, pad, enum_mbus_code,
>> - NULL, &mbus_code)) {
>> - mbus_code.index++;
>> -
>> - fmt = isc_find_format_by_code(isc, mbus_code.code, &i);
>> - if (!fmt) {
>> - v4l2_warn(&isc->v4l2_dev, "Mbus code %x not supported\n",
>> - mbus_code.code);
>> - continue;
>> - }
>> -
>> - fmt->sd_support = true;
>> - num_fmts++;
>> - }
>> -
>> - if (!num_fmts)
>> - return -ENXIO;
>> -
>> - isc->num_user_formats = num_fmts;
>> - isc->user_formats = devm_kcalloc(isc->dev,
>> - num_fmts, sizeof(*isc->user_formats),
>> - GFP_KERNEL);
>> - if (!isc->user_formats)
>> - return -ENOMEM;
>> -
>> - fmt = &isc->formats_list[0];
>> - for (i = 0, j = 0; i < list_size; i++) {
>> - if (fmt->sd_support)
>> - isc->user_formats[j++] = fmt;
>> - fmt++;
>> - }
>> -
>> - return 0;
>> -}
>> -
>> static int isc_set_default_fmt(struct isc_device *isc)
>> {
>> struct v4l2_format f = {
>> @@ -1836,12 +1780,12 @@ static int isc_set_default_fmt(struct isc_device *isc)
>> .width = VGA_WIDTH,
>> .height = VGA_HEIGHT,
>> .field = V4L2_FIELD_NONE,
>> - .pixelformat = isc->user_formats[0]->fourcc,
>> + .pixelformat = isc->controller_formats[0].fourcc,
>> },
>> };
>> int ret;
>>
>> - ret = isc_try_fmt(isc, &f, NULL);
>> + ret = isc_try_fmt(isc, &f);
>> if (ret)
>> return ret;
>>
>> @@ -1896,13 +1840,6 @@ static int isc_async_complete(struct v4l2_async_notifier *notifier)
>> spin_lock_init(&isc->dma_queue_lock);
>> spin_lock_init(&isc->awb_lock);
>>
>> - ret = isc_formats_init(isc);
>> - if (ret < 0) {
>> - v4l2_err(&isc->v4l2_dev,
>> - "Init format failed: %d\n", ret);
>> - goto isc_async_complete_err;
>> - }
>> -
>> ret = isc_set_default_fmt(isc);
>> if (ret) {
>> v4l2_err(&isc->v4l2_dev, "Could not set default format\n");
>> @@ -2015,6 +1952,24 @@ int isc_pipeline_init(struct isc_device *isc)
>> }
>> EXPORT_SYMBOL_GPL(isc_pipeline_init);
>>
>> +int isc_link_validate(struct media_link *link)
>> +{
>> + struct video_device *vdev =
>> + media_entity_to_video_device(link->sink->entity);
>> + struct isc_device *isc = video_get_drvdata(vdev);
>> + int ret;
>> +
>> + ret = v4l2_subdev_link_validate(link);
>> + if (ret)
>> + return ret;
>> +
>> + return isc_validate(isc);
>> +}
>> +
>> +static const struct media_entity_operations isc_entity_operations = {
>> + .link_validate = isc_link_validate,
>> +};
>> +
>> int isc_mc_init(struct isc_device *isc, u32 ver)
>> {
>> const struct of_device_id *match;
>> @@ -2022,6 +1977,8 @@ int isc_mc_init(struct isc_device *isc, u32 ver)
>>
>> isc->video_dev.entity.function = MEDIA_ENT_F_IO_V4L;
>> isc->video_dev.entity.flags = MEDIA_ENT_FL_DEFAULT;
>> + isc->video_dev.entity.ops = &isc_entity_operations;
>> +
>> isc->pads[ISC_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
>>
>> ret = media_entity_pads_init(&isc->video_dev.entity, ISC_PADS_NUM,
>> diff --git a/drivers/media/platform/atmel/atmel-isc-scaler.c b/drivers/media/platform/atmel/atmel-isc-scaler.c
>> index 0c1f49db47b4..b0200bb44f8a 100644
>> --- a/drivers/media/platform/atmel/atmel-isc-scaler.c
>> +++ b/drivers/media/platform/atmel/atmel-isc-scaler.c
>> @@ -171,6 +171,10 @@ static const struct v4l2_subdev_pad_ops isc_scaler_pad_ops = {
>> .init_cfg = isc_scaler_init_cfg,
>> };
>>
>> +static const struct media_entity_operations isc_scaler_entity_ops = {
>> + .link_validate = v4l2_subdev_link_validate,
>> +};
>> +
>> static const struct v4l2_subdev_ops xisc_scaler_subdev_ops = {
>> .pad = &isc_scaler_pad_ops,
>> };
>> @@ -188,6 +192,7 @@ int isc_scaler_init(struct isc_device *isc)
>>
>> isc->scaler_sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
>> isc->scaler_sd.entity.function = MEDIA_ENT_F_PROC_VIDEO_SCALER;
>> + isc->scaler_sd.entity.ops = &isc_scaler_entity_ops;
>> isc->scaler_pads[ISC_SCALER_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
>> isc->scaler_pads[ISC_SCALER_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
>>
>> diff --git a/drivers/media/platform/atmel/atmel-isc.h b/drivers/media/platform/atmel/atmel-isc.h
>> index ac8c8679dd53..e2261ce99f4f 100644
>> --- a/drivers/media/platform/atmel/atmel-isc.h
>> +++ b/drivers/media/platform/atmel/atmel-isc.h
>> @@ -63,15 +63,16 @@ struct isc_subdev_entity {
>> * @cfa_baycfg: If this format is RAW BAYER, indicate the type of bayer.
>> this is either BGBG, RGRG, etc.
>> * @pfe_cfg0_bps: Number of hardware data lines connected to the ISC
>> + * @raw: If the format is raw bayer.
>> */
>>
>> struct isc_format {
>> u32 fourcc;
>> u32 mbus_code;
>> u32 cfa_baycfg;
>> -
>> - bool sd_support;
>> u32 pfe_cfg0_bps;
>> +
>> + bool raw;
>> };
>>
>> /* Pipeline bitmap */
>> @@ -216,8 +217,7 @@ enum isc_scaler_pads {
>> * @comp: completion reference that signals frame completion
>> *
>> * @fmt: current v42l format
>> - * @user_formats: list of formats that are supported and agreed with sd
>> - * @num_user_formats: how many formats are in user_formats
>> + * @try_fmt: current v4l2 try format
>> *
>> * @config: current ISC format configuration
>> * @try_config: the current ISC try format , not yet activated
>> @@ -272,6 +272,7 @@ enum isc_scaler_pads {
>> * @formats_list_size: size of formats_list array
>> * @pads: media controller pads for isc video entity
>> * @mdev: media device that is registered by the isc
>> + * @mpipe: media device pipeline used by the isc
>> * @remote_pad: remote pad on the connected subdevice
>> * @scaler_sd: subdevice for the scaler that isc registers
>> * @scaler_pads: media controller pads for the scaler subdevice
>> @@ -300,8 +301,7 @@ struct isc_device {
>> struct completion comp;
>>
>> struct v4l2_format fmt;
>> - struct isc_format **user_formats;
>> - unsigned int num_user_formats;
>> + struct v4l2_format try_fmt;
>>
>> struct fmt_config config;
>> struct fmt_config try_config;
>> @@ -371,6 +371,7 @@ struct isc_device {
>> struct {
>> struct media_pad pads[ISC_PADS_NUM];
>> struct media_device mdev;
>> + struct media_pipeline mpipe;
>>
>> u32 remote_pad;
>> };
>> diff --git a/drivers/media/platform/atmel/atmel-sama5d2-isc.c b/drivers/media/platform/atmel/atmel-sama5d2-isc.c
>> index d96ee3373889..2a651e237193 100644
>> --- a/drivers/media/platform/atmel/atmel-sama5d2-isc.c
>> +++ b/drivers/media/platform/atmel/atmel-sama5d2-isc.c
>> @@ -80,20 +80,40 @@ static const struct isc_format sama5d2_controller_formats[] = {
>> .fourcc = V4L2_PIX_FMT_Y10,
>> }, {
>> .fourcc = V4L2_PIX_FMT_SBGGR8,
>> + .raw = true,
>> }, {
>> .fourcc = V4L2_PIX_FMT_SGBRG8,
>> + .raw = true,
>> }, {
>> .fourcc = V4L2_PIX_FMT_SGRBG8,
>> + .raw = true,
>> }, {
>> .fourcc = V4L2_PIX_FMT_SRGGB8,
>> + .raw = true,
>> }, {
>> .fourcc = V4L2_PIX_FMT_SBGGR10,
>> + .raw = true,
>> }, {
>> .fourcc = V4L2_PIX_FMT_SGBRG10,
>> + .raw = true,
>> }, {
>> .fourcc = V4L2_PIX_FMT_SGRBG10,
>> + .raw = true,
>> }, {
>> .fourcc = V4L2_PIX_FMT_SRGGB10,
>> + .raw = true,
>> + }, {
>> + .fourcc = V4L2_PIX_FMT_SBGGR12,
>> + .raw = true,
>> + }, {
>> + .fourcc = V4L2_PIX_FMT_SGBRG12,
>> + .raw = true,
>> + }, {
>> + .fourcc = V4L2_PIX_FMT_SGRBG12,
>> + .raw = true,
>> + }, {
>> + .fourcc = V4L2_PIX_FMT_SRGGB12,
>> + .raw = true,
>
> Is the list zero-initialized ? Begin a static const I assume so (I
> should look at the C spec instead of asking :)

Yes this should be the case.

Thank you for your detailed review.
I will come up with v6 soon and it should behave like I described above.

Eugen
>
>> },
>> };
>>
>> diff --git a/drivers/media/platform/atmel/atmel-sama7g5-isc.c b/drivers/media/platform/atmel/atmel-sama7g5-isc.c
>> index e07ae188c15f..a0d60cfdba7b 100644
>> --- a/drivers/media/platform/atmel/atmel-sama7g5-isc.c
>> +++ b/drivers/media/platform/atmel/atmel-sama7g5-isc.c
>> @@ -89,20 +89,40 @@ static const struct isc_format sama7g5_controller_formats[] = {
>> .fourcc = V4L2_PIX_FMT_Y16,
>> }, {
>> .fourcc = V4L2_PIX_FMT_SBGGR8,
>> + .raw = true,
>> }, {
>> .fourcc = V4L2_PIX_FMT_SGBRG8,
>> + .raw = true,
>> }, {
>> .fourcc = V4L2_PIX_FMT_SGRBG8,
>> + .raw = true,
>> }, {
>> .fourcc = V4L2_PIX_FMT_SRGGB8,
>> + .raw = true,
>> }, {
>> .fourcc = V4L2_PIX_FMT_SBGGR10,
>> + .raw = true,
>> }, {
>> .fourcc = V4L2_PIX_FMT_SGBRG10,
>> + .raw = true,
>> }, {
>> .fourcc = V4L2_PIX_FMT_SGRBG10,
>> + .raw = true,
>> }, {
>> .fourcc = V4L2_PIX_FMT_SRGGB10,
>> + .raw = true,
>> + }, {
>> + .fourcc = V4L2_PIX_FMT_SBGGR12,
>> + .raw = true,
>> + }, {
>> + .fourcc = V4L2_PIX_FMT_SGBRG12,
>> + .raw = true,
>> + }, {
>> + .fourcc = V4L2_PIX_FMT_SGRBG12,
>> + .raw = true,
>> + }, {
>> + .fourcc = V4L2_PIX_FMT_SRGGB12,
>> + .raw = true,
>> },
>> };
>>
>> --
>> 2.25.1
>>