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Message-ID: <7ac52a23-a732-4ac8-a00a-cc9084493f38@linaro.org>
Date: Tue, 13 Jan 2026 09:39:11 +0100
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Dikshita Agarwal <dikshita.agarwal@....qualcomm.com>,
Vikash Garodia <vikash.garodia@....qualcomm.com>,
Abhinav Kumar <abhinav.kumar@...ux.dev>, Bryan O'Donoghue <bod@...nel.org>,
Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
linux-kernel@...r.kernel.org,
Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Subject: Re: [PATCH v2 3/3] media: iris: Add support for QC08C format for
encoder
Hi,
On 1/9/26 15:28, Neil Armstrong wrote:
> Hi,
>
> On 10/8/25 11:52, Dikshita Agarwal wrote:
>> Introduce handling for the QC08C format in the encoder. QC08C
>> format is NV12 with UBWC compression. Update format checks and
>> configuration to enable encoding to QC08C streams.
>
> I'm late to the party but I've been trying the new encoder features patchset
> on top of v6.19-rc4 on the SM8650-HDK, but the result was wrong like if something
> was wrong in the planes offsets, leading the the UV colors moving in the background.
Gentle ping, I've trying to understand what causes this, could you help fix this ?
Thanks,
Neil
>
> The encoding was fine on v6.18 final release.
>
> Here's a screenshot:
> https://pasteboard.co/t8HmeNaIFMDR.png
>
> The command I use are:
>
> ffmpeg -f lavfi -i testsrc=duration=10:size=1920x1080:rate=30 -pix_fmt nv12 test_video_1080_10s.yuv
> v4l2-ctl --verbose --set-fmt-video-out=width=1920,height=1080,pixelformat=NV12 --set-selection-output target=crop,top=0,left=0,width=1920,height=1080 --set-fmt-video=pixelformat=H264 --stream-mmap --stream-out-mmap --stream-from=test_video_1080_10s.yuv --stream-to=test_video_1080_10s.h264 -d /dev/video1
>
>
> I did a bisect and it did lead to the very change:
> # bad: [9ace4753a5202b02191d54e9fdf7f9e3d02b85eb] Linux 6.19-rc4
> # good: [7d0a66e4bb9081d75c82ec4957c50034cb0ea449] Linux 6.18
> git bisect start 'v6.19-rc4' 'v6.18' 'drivers/media/platform/qcom/iris/'
> # bad: [6dfafbd0299a60bfb5d5e277fdf100037c7ded07] Merge tag 'drm-next-2025-12-03' of https://gitlab.freedesktop.org/drm/kernel
> git bisect bad 6dfafbd0299a60bfb5d5e277fdf100037c7ded07
> # good: [8f7aa3d3c7323f4ca2768a9e74ebbe359c4f8f88] Merge tag 'net-next-6.19' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
> git bisect good 8f7aa3d3c7323f4ca2768a9e74ebbe359c4f8f88
> # good: [490fd9336650a39c57ce2a652676a8cb9dc6c842] Merge tag 'drm-misc-next-2025-11-14-1' of https://gitlab.freedesktop.org/drm/misc/kernel into drm-next
> git bisect good 490fd9336650a39c57ce2a652676a8cb9dc6c842
> # good: [559e608c46553c107dbba19dae0854af7b219400] Merge tag 'ntfs3_for_6.19' of https://github.com/Paragon-Software-Group/linux-ntfs3
> git bisect good 559e608c46553c107dbba19dae0854af7b219400
> # good: [b3239df349c2c2c94686674489c9629c89ca49a1] Merge tag 'drm-misc-next-2025-12-01-1' of https://gitlab.freedesktop.org/drm/misc/kernel into drm-next
> git bisect good b3239df349c2c2c94686674489c9629c89ca49a1
> # good: [6e971cfe62e7a56593b22ab1ad0050ac49551696] media: venus: drop bogus probe deferrals
> git bisect good 6e971cfe62e7a56593b22ab1ad0050ac49551696
> # bad: [f53fb31a388901cfe11b95a3a2cf1594355321e4] media: rockchip: add driver for the rockchip camera interface
> git bisect bad f53fb31a388901cfe11b95a3a2cf1594355321e4
> # bad: [e687f5cae591dba4a0a968c24cbe7b6141027d93] media: imx-mipi-csis: Support active data lanes differing from maximum
> git bisect bad e687f5cae591dba4a0a968c24cbe7b6141027d93
> # bad: [c33f7e61a1c9e9255597102e61add4b4fe91668c] media: qcom: camss: Add CSIPHY 2.2.0 lane configuration for SM8650
> git bisect bad c33f7e61a1c9e9255597102e61add4b4fe91668c
> # bad: [542e3540ddd75f0a46dd365978476bcc1dda5b5a] media: iris: enable support for SC7280 platform
> git bisect bad 542e3540ddd75f0a46dd365978476bcc1dda5b5a
> # bad: [e5894eeefdebf5a6d7512cd23efec78071985738] media: iris: turn platform caps into constants
> git bisect bad e5894eeefdebf5a6d7512cd23efec78071985738
> # good: [7c1f3bd58fa02f427ff4ef611fa49b56bc6f8f76] media: iris: Add support for HFI_PROP_OPB_ENABLE to control split mode
> git bisect good 7c1f3bd58fa02f427ff4ef611fa49b56bc6f8f76
> # bad: [456c99da41cb6f39c5c8420710b72fb9fd1450b4] media: iris: Add support for QC08C format for encoder
> git bisect bad 456c99da41cb6f39c5c8420710b72fb9fd1450b4
> # good: [cfd71b14b0d6f62d97338a524c858c63cf699c3f] media: iris: Add support for QC08C format for decoder
> git bisect good cfd71b14b0d6f62d97338a524c858c63cf699c3f
> # first bad commit: [456c99da41cb6f39c5c8420710b72fb9fd1450b4] media: iris: Add support for QC08C format for encoder
>
> I don't see what would be causing this.
>
> Thanks,
> Neil
>
>>
>> Signed-off-by: Dikshita Agarwal <dikshita.agarwal@....qualcomm.com>
>> ---
>> drivers/media/platform/qcom/iris/iris_buffer.c | 12 ++++-
>> .../platform/qcom/iris/iris_hfi_gen1_command.c | 3 +-
>> .../platform/qcom/iris/iris_hfi_gen2_command.c | 3 +-
>> drivers/media/platform/qcom/iris/iris_venc.c | 59 ++++++++++++++++++----
>> 4 files changed, 63 insertions(+), 14 deletions(-)
>>
>> diff --git a/drivers/media/platform/qcom/iris/iris_buffer.c b/drivers/media/platform/qcom/iris/iris_buffer.c
>> index 83dcf49e57ec1473bc4edd26c48ab0b247d23818..b89b1ee06cce151e7c04a80956380d154643c116 100644
>> --- a/drivers/media/platform/qcom/iris/iris_buffer.c
>> +++ b/drivers/media/platform/qcom/iris/iris_buffer.c
>> @@ -171,9 +171,14 @@ static u32 iris_yuv_buffer_size_nv12(struct iris_inst *inst)
>> static u32 iris_yuv_buffer_size_qc08c(struct iris_inst *inst)
>> {
>> u32 y_plane, uv_plane, y_stride, uv_stride;
>> - struct v4l2_format *f = inst->fmt_dst;
>> u32 uv_meta_stride, uv_meta_plane;
>> u32 y_meta_stride, y_meta_plane;
>> + struct v4l2_format *f = NULL;
>> +
>> + if (inst->domain == DECODER)
>> + f = inst->fmt_dst;
>> + else
>> + f = inst->fmt_src;
>> y_meta_stride = ALIGN(DIV_ROUND_UP(f->fmt.pix_mp.width, META_STRIDE_ALIGNED >> 1),
>> META_STRIDE_ALIGNED);
>> @@ -273,7 +278,10 @@ int iris_get_buffer_size(struct iris_inst *inst,
>> } else {
>> switch (buffer_type) {
>> case BUF_INPUT:
>> - return iris_yuv_buffer_size_nv12(inst);
>> + if (inst->fmt_src->fmt.pix_mp.pixelformat == V4L2_PIX_FMT_QC08C)
>> + return iris_yuv_buffer_size_qc08c(inst);
>> + else
>> + return iris_yuv_buffer_size_nv12(inst);
>> case BUF_OUTPUT:
>> return iris_enc_bitstream_buffer_size(inst);
>> default:
>> diff --git a/drivers/media/platform/qcom/iris/iris_hfi_gen1_command.c b/drivers/media/platform/qcom/iris/iris_hfi_gen1_command.c
>> index e458d3349ce09aadb75d056ae84e3aab95f03078..52da7ef7bab08fb1cb2ac804ccc6e3c7f9677890 100644
>> --- a/drivers/media/platform/qcom/iris/iris_hfi_gen1_command.c
>> +++ b/drivers/media/platform/qcom/iris/iris_hfi_gen1_command.c
>> @@ -795,7 +795,8 @@ static int iris_hfi_gen1_set_raw_format(struct iris_inst *inst, u32 plane)
>> } else {
>> pixelformat = inst->fmt_src->fmt.pix_mp.pixelformat;
>> fmt.buffer_type = HFI_BUFFER_INPUT;
>> - fmt.format = pixelformat == V4L2_PIX_FMT_NV12 ? HFI_COLOR_FORMAT_NV12 : 0;
>> + fmt.format = pixelformat == V4L2_PIX_FMT_NV12 ?
>> + HFI_COLOR_FORMAT_NV12 : HFI_COLOR_FORMAT_NV12_UBWC;
>> ret = hfi_gen1_set_property(inst, ptype, &fmt, sizeof(fmt));
>> }
>> diff --git a/drivers/media/platform/qcom/iris/iris_hfi_gen2_command.c b/drivers/media/platform/qcom/iris/iris_hfi_gen2_command.c
>> index 5ad202d3fcdc57a2b7b43de15763a686ce0f7bd7..6a772db2ec33fb002d8884753a41dc98b3a8439d 100644
>> --- a/drivers/media/platform/qcom/iris/iris_hfi_gen2_command.c
>> +++ b/drivers/media/platform/qcom/iris/iris_hfi_gen2_command.c
>> @@ -447,7 +447,8 @@ static int iris_hfi_gen2_set_colorformat(struct iris_inst *inst, u32 plane)
>> HFI_COLOR_FMT_NV12 : HFI_COLOR_FMT_NV12_UBWC;
>> } else {
>> pixelformat = inst->fmt_src->fmt.pix_mp.pixelformat;
>> - hfi_colorformat = pixelformat == V4L2_PIX_FMT_NV12 ? HFI_COLOR_FMT_NV12 : 0;
>> + hfi_colorformat = pixelformat == V4L2_PIX_FMT_NV12 ?
>> + HFI_COLOR_FMT_NV12 : HFI_COLOR_FMT_NV12_UBWC;
>> }
>> return iris_hfi_gen2_session_set_property(inst,
>> diff --git a/drivers/media/platform/qcom/iris/iris_venc.c b/drivers/media/platform/qcom/iris/iris_venc.c
>> index 099bd5ed4ae0294725860305254c4cad1ec88d7e..95e3ceb22d8c3a46c1bf3eb87e7c1cc5ccf3039f 100644
>> --- a/drivers/media/platform/qcom/iris/iris_venc.c
>> +++ b/drivers/media/platform/qcom/iris/iris_venc.c
>> @@ -80,7 +80,7 @@ void iris_venc_inst_deinit(struct iris_inst *inst)
>> kfree(inst->fmt_src);
>> }
>> -static const struct iris_fmt iris_venc_formats[] = {
>> +static const struct iris_fmt iris_venc_formats_cap[] = {
>> [IRIS_FMT_H264] = {
>> .pixfmt = V4L2_PIX_FMT_H264,
>> .type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE,
>> @@ -91,12 +91,35 @@ static const struct iris_fmt iris_venc_formats[] = {
>> },
>> };
>> +static const struct iris_fmt iris_venc_formats_out[] = {
>> + [IRIS_FMT_NV12] = {
>> + .pixfmt = V4L2_PIX_FMT_NV12,
>> + .type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE,
>> + },
>> + [IRIS_FMT_QC08C] = {
>> + .pixfmt = V4L2_PIX_FMT_QC08C,
>> + .type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE,
>> + },
>> +};
>> +
>> static const struct iris_fmt *
>> find_format(struct iris_inst *inst, u32 pixfmt, u32 type)
>> {
>> - const struct iris_fmt *fmt = iris_venc_formats;
>> - unsigned int size = ARRAY_SIZE(iris_venc_formats);
>> + const struct iris_fmt *fmt = NULL;
>> + unsigned int size = 0;
>> unsigned int i;
>> + switch (type) {
>> + case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
>> + fmt = iris_venc_formats_out;
>> + size = ARRAY_SIZE(iris_venc_formats_out);
>> + break;
>> + case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
>> + fmt = iris_venc_formats_cap;
>> + size = ARRAY_SIZE(iris_venc_formats_cap);
>> + break;
>> + default:
>> + return NULL;
>> + }
>> for (i = 0; i < size; i++) {
>> if (fmt[i].pixfmt == pixfmt)
>> @@ -112,8 +135,21 @@ find_format(struct iris_inst *inst, u32 pixfmt, u32 type)
>> static const struct iris_fmt *
>> find_format_by_index(struct iris_inst *inst, u32 index, u32 type)
>> {
>> - const struct iris_fmt *fmt = iris_venc_formats;
>> - unsigned int size = ARRAY_SIZE(iris_venc_formats);
>> + const struct iris_fmt *fmt = NULL;
>> + unsigned int size = 0;
>> +
>> + switch (type) {
>> + case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
>> + fmt = iris_venc_formats_out;
>> + size = ARRAY_SIZE(iris_venc_formats_out);
>> + break;
>> + case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
>> + fmt = iris_venc_formats_cap;
>> + size = ARRAY_SIZE(iris_venc_formats_cap);
>> + break;
>> + default:
>> + return NULL;
>> + }
>> if (index >= size || fmt[index].type != type)
>> return NULL;
>> @@ -127,9 +163,11 @@ int iris_venc_enum_fmt(struct iris_inst *inst, struct v4l2_fmtdesc *f)
>> switch (f->type) {
>> case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
>> - if (f->index)
>> + fmt = find_format_by_index(inst, f->index, f->type);
>> + if (!fmt)
>> return -EINVAL;
>> - f->pixelformat = V4L2_PIX_FMT_NV12;
>> +
>> + f->pixelformat = fmt->pixfmt;
>> break;
>> case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
>> fmt = find_format_by_index(inst, f->index, f->type);
>> @@ -156,7 +194,7 @@ int iris_venc_try_fmt(struct iris_inst *inst, struct v4l2_format *f)
>> fmt = find_format(inst, pixmp->pixelformat, f->type);
>> switch (f->type) {
>> case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
>> - if (f->fmt.pix_mp.pixelformat != V4L2_PIX_FMT_NV12) {
>> + if (!fmt) {
>> f_inst = inst->fmt_src;
>> f->fmt.pix_mp.width = f_inst->fmt.pix_mp.width;
>> f->fmt.pix_mp.height = f_inst->fmt.pix_mp.height;
>> @@ -221,7 +259,7 @@ static int iris_venc_s_fmt_input(struct iris_inst *inst, struct v4l2_format *f)
>> iris_venc_try_fmt(inst, f);
>> - if (f->fmt.pix_mp.pixelformat != V4L2_PIX_FMT_NV12)
>> + if (!(find_format(inst, f->fmt.pix_mp.pixelformat, f->type)))
>> return -EINVAL;
>> fmt = inst->fmt_src;
>> @@ -289,7 +327,8 @@ int iris_venc_validate_format(struct iris_inst *inst, u32 pixelformat)
>> {
>> const struct iris_fmt *fmt = NULL;
>> - if (pixelformat != V4L2_PIX_FMT_NV12) {
>> + fmt = find_format(inst, pixelformat, V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE);
>> + if (!fmt) {
>> fmt = find_format(inst, pixelformat, V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE);
>> if (!fmt)
>> return -EINVAL;
>>
>
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