[PATCH v4 0/3] media: qcom: iris: add multi slice support

[PATCH v4 0/3] media: qcom: iris: add multi slice support

[Sachin Kumar Garg]

This series adds support for multi-slice encoding in the Qualcomm Iris
driver.

Multi-slice mode allows encoding a single frame into multiple slices,
which can improve error resilience and enable parallel processing.
The feature supports two slice modes:
- MAX_MB mode: slices are created based on macroblock count, controlled
  via V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB
- MAX_BYTES mode: slices are created based on byte size, controlled via
  V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES

Clients can enable slice mode using the V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE
control.

Patch 1 is a prerequisite fix: iris_set_stage() computes a work_mode
but never caches it back into inst->fw_caps[STAGE].value, leaving
buffer-size and clock-frequency calculations based on a stale value.

Patch 2 is another prerequisite fix: iris_set_stage() currently always
selects STAGE_2 work mode for encoder sessions, but CBR rate control
requires STAGE_1. This is fixed by forcing STAGE_1 when BITRATE_MODE is
set to CBR.

Patch 3 adds the multi-slice support itself for Iris HFI Gen2 based
targets (qcs8300, sm8550 and other SM8550-derived targets).
Support for HFI Gen1 targets will be added in a follow-up series.

This series has been verified with GST level testing.
Command used:
gst-launch-1.0 -v videotestsrc ! video/x-raw,format=NV12, \
width=1280,height=720,framerate=30/1 ! v4l2h264enc output-io-mode=4 |
capture-io-mode=4 extra-controls="controls,video_bitrate_mode=1, \
slice_partitioning_method=1,number_of_mbs_in_a_slice=460;" \
! filesink location=/opt/test_enc.h264

Changes in v4:
- Split out a new prerequisite patch (patch 1) to cache the computed
  work_mode into inst->fw_caps[STAGE].value in iris_set_stage(), since
  this fixes a pre-existing bug independent of the CBR change and
  needed its own Fixes tag.
- Deduplicated the per-target slice capability limits that were
  previously repeated identically across platform_inst_cap_qcs8300 and
  platform_inst_cap_sm8550. Introduced struct platform_inst_slice_caps
  and moved it to iris_platform_data (one level up from
  platform_inst_caps), since all Iris HFI Gen2 targets share the same
  encoder capability table and hence the same slice limits; a single
  default_slice_caps_vpu3x instance is now referenced by all Gen2
  platforms.
- Link to v3: https://lore.kernel.org/r/20260721-iris_multi_slice-v3-0-adc61a687e7e@oss.qualcomm.com

Changes in v3:
- Patch 1 (force stage 1 work mode for CBR RC): cache the computed
  work_mode into inst->fw_caps[STAGE].value so buffer-size and
  clock-frequency calculations stay consistent with what is actually
  configured on firmware.
- Patch 2 (multi-slice support):
  - Use inst->hfi_rc_type instead of the raw V4L2 BITRATE_MODE value
    when validating/deriving slice parameters, avoiding a mismatch
    between V4L2 and firmware rate-control enums.
  - Round up (instead of truncate) when computing the minimum
    MAX_MB and MAX_BYTES slice size floors, so the hardware's
    max-slices-per-frame limit is never exceeded.

Changes in v2:
- Added a prerequisite patch to force STAGE_1 work mode for CBR rate
  control on the encoder, required for multi-slice encoding to work
  correctly.
- Addressed review comments on the multi-slice patch (updated commit
  subject and description).

Signed-off-by: Sachin Kumar Garg <sachin.garg@oss.qualcomm.com>
---
Sachin Kumar Garg (3):
      media: iris: cache work mode after computing it in iris_set_stage
      media: iris: force stage 1 work mode for CBR RC on encoder
      media: iris: add support for multi_slice in iris encoder

 drivers/media/platform/qcom/iris/iris_ctrls.c      | 84 ++++++++++++++++++++++
 drivers/media/platform/qcom/iris/iris_ctrls.h      |  1 +
 drivers/media/platform/qcom/iris/iris_hfi_gen2.c   | 33 ++++++++-
 .../platform/qcom/iris/iris_hfi_gen2_defines.h     |  2 +
 .../platform/qcom/iris/iris_platform_common.h      | 16 +++++
 .../media/platform/qcom/iris/iris_platform_vpu3x.c | 17 +++++
 6 files changed, 152 insertions(+), 1 deletion(-)
---
base-commit: 42f83a32259a82c4481d3cccf560c3bfeb32c892
change-id: 20260716-iris_multi_slice-5647287a9563

Best regards,
-- 
Sachin Kumar Garg <sachin.garg@oss.qualcomm.com>

[PATCH v4 1/3] media: iris: cache work mode after computing it in iris_set_stage

[Sachin Kumar Garg]

iris_set_stage() computes work_mode and sends it to firmware but
never updates inst->fw_caps[STAGE].value, leaving the cached STAGE
value stale. iris_vpu_enc_bin_size() and
iris_vpu3x_vpu4x_calculate_frequency() read this cached value, so a
stale default causes them to miscalculate buffer size and clock
frequency for sessions actually running in a different stage than
the cached one.

Update inst->fw_caps[cap_id].value with the computed work_mode
before sending it to firmware, keeping the cache consistent with
what is actually configured.

Fixes: 3a19d7b9e08b ("media: iris: implement set properties to firmware during streamon")
Signed-off-by: Sachin Kumar Garg <sachin.garg@oss.qualcomm.com>
---
 drivers/media/platform/qcom/iris/iris_ctrls.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/media/platform/qcom/iris/iris_ctrls.c b/drivers/media/platform/qcom/iris/iris_ctrls.c
index 10e33b8a73f6..58d195d2ab87 100644
--- a/drivers/media/platform/qcom/iris/iris_ctrls.c
+++ b/drivers/media/platform/qcom/iris/iris_ctrls.c
@@ -521,6 +521,8 @@ int iris_set_stage(struct iris_inst *inst, enum platform_inst_fw_cap_type cap_id
 			work_mode = STAGE_1;
 	}
 
+	inst->fw_caps[cap_id].value = work_mode;
+
 	return hfi_ops->session_set_property(inst, hfi_id,
 					     HFI_HOST_FLAGS_NONE,
 					     iris_get_port_info(inst, cap_id),

-- 
2.34.1

Re: [PATCH v4 1/3] media: iris: cache work mode after computing it in iris_set_stage

[Vikash Garodia]

On 7/23/2026 3:51 PM, Sachin Kumar Garg wrote:
> iris_set_stage() computes work_mode and sends it to firmware but
> never updates inst->fw_caps[STAGE].value, leaving the cached STAGE
> value stale. iris_vpu_enc_bin_size() and
> iris_vpu3x_vpu4x_calculate_frequency() read this cached value, so a
> stale default causes them to miscalculate buffer size and clock
> frequency for sessions actually running in a different stage than
> the cached one.
> 
> Update inst->fw_caps[cap_id].value with the computed work_mode
> before sending it to firmware, keeping the cache consistent with
> what is actually configured.
> 
> Fixes: 3a19d7b9e08b ("media: iris: implement set properties to firmware during streamon")
> Signed-off-by: Sachin Kumar Garg<sachin.garg@oss.qualcomm.com>
> ---
>   drivers/media/platform/qcom/iris/iris_ctrls.c | 2 ++
>   1 file changed, 2 insertions(+)

Reviewed-by: Vikash Garodia <vikash.garodia@oss.qualcomm.com>

[PATCH v4 2/3] media: iris: force stage 1 work mode for CBR RC on encoder

[Sachin Kumar Garg]

iris_set_stage() currently always picks STAGE_2 for encoder sessions.
CBR rate control requires stage 1 operation, so force STAGE_1 when
BITRATE_MODE is set to CBR.

The BITRATE_MODE fw_cap value is used instead of inst->hfi_rc_type
since STAGE precedes BITRATE_MODE in enum platform_inst_fw_cap_type,
so iris_set_properties() would still see the previous hfi_rc_type
when iris_set_stage() runs during initial config

Reviewed-by: Vishnu Reddy <busanna.reddy@oss.qualcomm.com>
Signed-off-by: Sachin Kumar Garg <sachin.garg@oss.qualcomm.com>
---
 drivers/media/platform/qcom/iris/iris_ctrls.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/media/platform/qcom/iris/iris_ctrls.c b/drivers/media/platform/qcom/iris/iris_ctrls.c
index 58d195d2ab87..d7cbf6c3614a 100644
--- a/drivers/media/platform/qcom/iris/iris_ctrls.c
+++ b/drivers/media/platform/qcom/iris/iris_ctrls.c
@@ -519,6 +519,9 @@ int iris_set_stage(struct iris_inst *inst, enum platform_inst_fw_cap_type cap_id
 	if (inst->domain == DECODER) {
 		if (iris_res_is_less_than(width, height, 1280, 720))
 			work_mode = STAGE_1;
+	} else if (inst->domain == ENCODER) {
+		if (inst->fw_caps[BITRATE_MODE].value == V4L2_MPEG_VIDEO_BITRATE_MODE_CBR)
+			work_mode = STAGE_1;
 	}
 
 	inst->fw_caps[cap_id].value = work_mode;

-- 
2.34.1

Re: [PATCH v4 2/3] media: iris: force stage 1 work mode for CBR RC on encoder

[Vikash Garodia]

On 7/23/2026 3:51 PM, Sachin Kumar Garg wrote:
> iris_set_stage() currently always picks STAGE_2 for encoder sessions.
> CBR rate control requires stage 1 operation, so force STAGE_1 when
> BITRATE_MODE is set to CBR.
> 
> The BITRATE_MODE fw_cap value is used instead of inst->hfi_rc_type
> since STAGE precedes BITRATE_MODE in enum platform_inst_fw_cap_type,
> so iris_set_properties() would still see the previous hfi_rc_type
> when iris_set_stage() runs during initial config
> 
> Reviewed-by: Vishnu Reddy<busanna.reddy@oss.qualcomm.com>
> Signed-off-by: Sachin Kumar Garg<sachin.garg@oss.qualcomm.com>
> ---
>   drivers/media/platform/qcom/iris/iris_ctrls.c | 3 +++
>   1 file changed, 3 insertions(+)

Reviewed-by: Vikash Garodia <vikash.garodia@oss.qualcomm.com>

[PATCH v4 3/3] media: iris: add support for multi_slice in iris encoder

[Sachin Kumar Garg]

Add multi-slice encoding support with MAX_MB and MAX_BYTES modes.

Clients can enable slice mode using V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE
control and configure slice size via V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB
or V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES controls.

Signed-off-by: Sachin Kumar Garg <sachin.garg@oss.qualcomm.com>
---
 drivers/media/platform/qcom/iris/iris_ctrls.c      | 79 ++++++++++++++++++++++
 drivers/media/platform/qcom/iris/iris_ctrls.h      |  1 +
 drivers/media/platform/qcom/iris/iris_hfi_gen2.c   | 33 ++++++++-
 .../platform/qcom/iris/iris_hfi_gen2_defines.h     |  2 +
 .../platform/qcom/iris/iris_platform_common.h      | 16 +++++
 .../media/platform/qcom/iris/iris_platform_vpu3x.c | 17 +++++
 6 files changed, 147 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/qcom/iris/iris_ctrls.c b/drivers/media/platform/qcom/iris/iris_ctrls.c
index d7cbf6c3614a..ed7ed4b89a5a 100644
--- a/drivers/media/platform/qcom/iris/iris_ctrls.c
+++ b/drivers/media/platform/qcom/iris/iris_ctrls.c
@@ -154,6 +154,12 @@ static enum platform_inst_fw_cap_type iris_get_cap_id(u32 id)
 		return LAYER4_BITRATE_HEVC;
 	case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L5_BR:
 		return LAYER5_BITRATE_HEVC;
+	case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
+		return SLICE_MODE;
+	case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES:
+		return SLICE_MAX_BYTES;
+	case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB:
+		return SLICE_MAX_MB;
 	default:
 		return INST_FW_CAP_MAX;
 	}
@@ -297,6 +303,12 @@ static u32 iris_get_v4l2_id(enum platform_inst_fw_cap_type cap_id)
 		return V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L4_BR;
 	case LAYER5_BITRATE_HEVC:
 		return V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L5_BR;
+	case SLICE_MODE:
+		return V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE;
+	case SLICE_MAX_BYTES:
+		return V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES;
+	case SLICE_MAX_MB:
+		return V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB;
 	default:
 		return 0;
 	}
@@ -1482,6 +1494,73 @@ int iris_set_layer_bitrate(struct iris_inst *inst, enum platform_inst_fw_cap_typ
 					     &bitrate, sizeof(u32));
 }
 
+int iris_set_slice_count(struct iris_inst *inst, enum platform_inst_fw_cap_type cap_id)
+{
+	const struct iris_hfi_session_ops *hfi_ops = inst->hfi_session_ops;
+	const struct platform_inst_slice_caps *slice_caps =
+		inst->core->iris_platform_data->slice_caps;
+	u32 slice_mode = inst->fw_caps[SLICE_MODE].value;
+	u32 bitrate = inst->fw_caps[BITRATE].value;
+	u32 rc_type = inst->hfi_rc_type;
+	u32 fps = inst->frame_rate;
+	u32 output_width = inst->fmt_dst->fmt.pix_mp.width;
+	u32 output_height = inst->fmt_dst->fmt.pix_mp.height;
+	u32 mbpf = NUM_MBS_PER_FRAME(output_height, output_width);
+	u32 max_width, max_height, min_width, min_height;
+	u32 max_avg_slicesize, hfi_value, hfi_id;
+
+	if (slice_mode == V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_SINGLE) {
+		dev_dbg(inst->core->dev, "slice mode is: %u, ignore setting to fw\n", slice_mode);
+		return 0;
+	}
+	if (fps > slice_caps->max_slice_frame_rate ||
+	    (rc_type != HFI_RC_OFF && rc_type != HFI_RC_CBR_CFR &&
+	    rc_type != HFI_RC_CBR_VFR && rc_type != HFI_RC_VBR_CFR)) {
+		dev_err(inst->core->dev, "slice unsupported, fps: %u, rc_type: %#x\n",
+			fps, rc_type);
+		return -EINVAL;
+	}
+
+	max_width = (slice_mode == V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_MB) ?
+			slice_caps->max_mb_slice_width : slice_caps->max_bytes_slice_width;
+	max_height = (slice_mode == V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_MB) ?
+			slice_caps->max_mb_slice_height : slice_caps->max_bytes_slice_height;
+	min_width = (inst->codec == V4L2_PIX_FMT_HEVC) ?
+			slice_caps->min_hevc_slice_width : slice_caps->min_avc_slice_width;
+	min_height = slice_caps->min_slice_height;
+
+	if (output_width < min_width || output_height < min_height ||
+	    output_width > max_width || output_height > max_height) {
+		dev_err(inst->core->dev, "slice unsupported, codec: %#x wxh: [%dx%d]\n",
+			inst->codec, output_width, output_height);
+		return -EINVAL;
+	}
+
+	if (slice_mode == V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_MB) {
+		hfi_value = inst->fw_caps[SLICE_MAX_MB].value;
+		hfi_value = max(hfi_value, DIV_ROUND_UP(mbpf, slice_caps->max_slices_per_frame));
+		if (inst->codec == V4L2_PIX_FMT_HEVC)
+			hfi_value = (hfi_value + 3) / 4;
+		hfi_id = inst->fw_caps[SLICE_MAX_MB].hfi_id;
+	} else if (slice_mode == V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_BYTES) {
+		hfi_value = inst->fw_caps[SLICE_MAX_BYTES].value;
+		if (rc_type != HFI_RC_OFF) {
+			max_avg_slicesize = DIV_ROUND_UP((bitrate / fps) / 8,
+							 slice_caps->max_slices_per_frame);
+			hfi_value = max(hfi_value, max_avg_slicesize);
+		}
+		hfi_id = inst->fw_caps[SLICE_MAX_BYTES].hfi_id;
+	} else {
+		return -EINVAL;
+	}
+
+	return hfi_ops->session_set_property(inst, hfi_id,
+					     HFI_HOST_FLAGS_NONE,
+					     iris_get_port_info(inst, cap_id),
+					     HFI_PAYLOAD_U32,
+					     &hfi_value, sizeof(u32));
+}
+
 int iris_set_properties(struct iris_inst *inst, u32 plane)
 {
 	const struct iris_hfi_session_ops *hfi_ops = inst->hfi_session_ops;
diff --git a/drivers/media/platform/qcom/iris/iris_ctrls.h b/drivers/media/platform/qcom/iris/iris_ctrls.h
index 3c462ec9190b..5a73c7c49d36 100644
--- a/drivers/media/platform/qcom/iris/iris_ctrls.h
+++ b/drivers/media/platform/qcom/iris/iris_ctrls.h
@@ -47,6 +47,7 @@ int iris_set_layer_type(struct iris_inst *inst, enum platform_inst_fw_cap_type c
 int iris_set_layer_count_gen1(struct iris_inst *inst, enum platform_inst_fw_cap_type cap_id);
 int iris_set_layer_count_gen2(struct iris_inst *inst, enum platform_inst_fw_cap_type cap_id);
 int iris_set_layer_bitrate(struct iris_inst *inst, enum platform_inst_fw_cap_type cap_id);
+int iris_set_slice_count(struct iris_inst *inst, enum platform_inst_fw_cap_type cap_id);
 int iris_set_properties(struct iris_inst *inst, u32 plane);
 
 #endif
diff --git a/drivers/media/platform/qcom/iris/iris_hfi_gen2.c b/drivers/media/platform/qcom/iris/iris_hfi_gen2.c
index acc0ed8adda1..fcbebced05c3 100644
--- a/drivers/media/platform/qcom/iris/iris_hfi_gen2.c
+++ b/drivers/media/platform/qcom/iris/iris_hfi_gen2.c
@@ -12,6 +12,8 @@
 
 #define VIDEO_ARCH_LX 1
 #define BITRATE_MAX				245000000
+#define MAX_SLICE_MB_SIZE         \
+	(((4096 + 15) >> 4) * ((2160 + 15) >> 4))
 
 static const struct platform_inst_fw_cap inst_fw_cap_sm8550_dec[] = {
 	{
@@ -937,7 +939,36 @@ static const struct platform_inst_fw_cap inst_fw_cap_sm8550_enc[] = {
 		.flags = CAP_FLAG_OUTPUT_PORT | CAP_FLAG_INPUT_PORT |
 			CAP_FLAG_DYNAMIC_ALLOWED,
 		.set = iris_set_layer_bitrate,
-	}
+	},
+	{
+		.cap_id = SLICE_MODE,
+		.min = V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_SINGLE,
+		.max = V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_BYTES,
+		.step_or_mask = BIT(V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_SINGLE) |
+					BIT(V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_MB) |
+					BIT(V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_BYTES),
+		.value = V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_SINGLE,
+		.flags = CAP_FLAG_OUTPUT_PORT | CAP_FLAG_MENU,
+		.set = iris_set_slice_count,
+	},
+	{
+		.cap_id = SLICE_MAX_BYTES,
+		.min = 512,
+		.max = BITRATE_MAX >> 3,
+		.step_or_mask = 1,
+		.value = 512,
+		.hfi_id = HFI_PROP_MULTI_SLICE_BYTES_COUNT,
+		.flags = CAP_FLAG_OUTPUT_PORT,
+	},
+	{
+		.cap_id = SLICE_MAX_MB,
+		.min = 1,
+		.max = MAX_SLICE_MB_SIZE,
+		.step_or_mask = 1,
+		.value = 1,
+		.hfi_id = HFI_PROP_MULTI_SLICE_MB_COUNT,
+		.flags = CAP_FLAG_OUTPUT_PORT,
+	},
 };
 
 static const u32 sm8550_vdec_input_config_params_default[] = {
diff --git a/drivers/media/platform/qcom/iris/iris_hfi_gen2_defines.h b/drivers/media/platform/qcom/iris/iris_hfi_gen2_defines.h
index 776b21cd11b2..226894b99dcc 100644
--- a/drivers/media/platform/qcom/iris/iris_hfi_gen2_defines.h
+++ b/drivers/media/platform/qcom/iris/iris_hfi_gen2_defines.h
@@ -71,6 +71,8 @@ enum hfi_rate_control {
 #define HFI_PROP_MIN_QP_PACKED			0x0300012f
 #define HFI_PROP_MAX_QP_PACKED			0x03000130
 #define HFI_PROP_IR_RANDOM_PERIOD		0x03000131
+#define HFI_PROP_MULTI_SLICE_MB_COUNT		0x03000132
+#define HFI_PROP_MULTI_SLICE_BYTES_COUNT	0x03000133
 #define HFI_PROP_LTR_COUNT			0x03000134
 #define HFI_PROP_LTR_MARK			0x03000135
 #define HFI_PROP_LTR_USE			0x03000136
diff --git a/drivers/media/platform/qcom/iris/iris_platform_common.h b/drivers/media/platform/qcom/iris/iris_platform_common.h
index c9256f2323dc..ad9f2b20cd90 100644
--- a/drivers/media/platform/qcom/iris/iris_platform_common.h
+++ b/drivers/media/platform/qcom/iris/iris_platform_common.h
@@ -88,6 +88,18 @@ struct tz_cp_config {
 	u32 cp_nonpixel_size;
 };
 
+struct platform_inst_slice_caps {
+	u32 max_slices_per_frame;
+	u32 max_slice_frame_rate;
+	u32 max_mb_slice_width;
+	u32 max_mb_slice_height;
+	u32 max_bytes_slice_width;
+	u32 max_bytes_slice_height;
+	u32 min_hevc_slice_width;
+	u32 min_avc_slice_width;
+	u32 min_slice_height;
+};
+
 struct platform_inst_caps {
 	u32 min_frame_width;
 	u32 max_frame_width;
@@ -183,6 +195,9 @@ enum platform_inst_fw_cap_type {
 	LAYER3_BITRATE_HEVC,
 	LAYER4_BITRATE_HEVC,
 	LAYER5_BITRATE_HEVC,
+	SLICE_MODE,
+	SLICE_MAX_BYTES,
+	SLICE_MAX_MB,
 	INST_FW_CAP_MAX,
 };
 
@@ -315,6 +330,7 @@ struct iris_platform_data {
 	const u32 *inst_iris_fmts;
 	u32 inst_iris_fmts_size;
 	struct platform_inst_caps *inst_caps;
+	const struct platform_inst_slice_caps *slice_caps;
 	const struct tz_cp_config *tz_cp_config_data;
 	u32 tz_cp_config_data_size;
 	u32 num_vpp_pipe;
diff --git a/drivers/media/platform/qcom/iris/iris_platform_vpu3x.c b/drivers/media/platform/qcom/iris/iris_platform_vpu3x.c
index 2c63adbc5579..6e44bed5ebff 100644
--- a/drivers/media/platform/qcom/iris/iris_platform_vpu3x.c
+++ b/drivers/media/platform/qcom/iris/iris_platform_vpu3x.c
@@ -12,6 +12,18 @@
 #include "iris_vpu_buffer.h"
 #include "iris_vpu_common.h"
 
+static const struct platform_inst_slice_caps default_slice_caps_vpu3x = {
+	.max_slices_per_frame = 128,
+	.max_slice_frame_rate = 60,
+	.max_mb_slice_width = 4096,
+	.max_mb_slice_height = 2160,
+	.max_bytes_slice_width = 1920,
+	.max_bytes_slice_height = 1088,
+	.min_hevc_slice_width = 384,
+	.min_avc_slice_width = 192,
+	.min_slice_height = 128,
+};
+
 #include "iris_platform_qcs8300.h"
 #include "iris_platform_sm8550.h"
 #include "iris_platform_sm8650.h"
@@ -110,6 +122,7 @@ const struct iris_platform_data qcs8300_data = {
 	.inst_iris_fmts = iris_fmts_vpu3x_dec,
 	.inst_iris_fmts_size = ARRAY_SIZE(iris_fmts_vpu3x_dec),
 	.inst_caps = &platform_inst_cap_qcs8300,
+	.slice_caps = &default_slice_caps_vpu3x,
 	.tz_cp_config_data = tz_cp_config_vpu3,
 	.tz_cp_config_data_size = ARRAY_SIZE(tz_cp_config_vpu3),
 	.num_vpp_pipe = 2,
@@ -139,6 +152,7 @@ const struct iris_platform_data sm8550_data = {
 	.inst_iris_fmts = iris_fmts_vpu3x_dec,
 	.inst_iris_fmts_size = ARRAY_SIZE(iris_fmts_vpu3x_dec),
 	.inst_caps = &platform_inst_cap_sm8550,
+	.slice_caps = &default_slice_caps_vpu3x,
 	.tz_cp_config_data = tz_cp_config_vpu3,
 	.tz_cp_config_data_size = ARRAY_SIZE(tz_cp_config_vpu3),
 	.num_vpp_pipe = 4,
@@ -176,6 +190,7 @@ const struct iris_platform_data sm8650_data = {
 	.inst_iris_fmts = iris_fmts_vpu3x_dec,
 	.inst_iris_fmts_size = ARRAY_SIZE(iris_fmts_vpu3x_dec),
 	.inst_caps = &platform_inst_cap_sm8550,
+	.slice_caps = &default_slice_caps_vpu3x,
 	.tz_cp_config_data = tz_cp_config_vpu3,
 	.tz_cp_config_data_size = ARRAY_SIZE(tz_cp_config_vpu3),
 	.num_vpp_pipe = 4,
@@ -205,6 +220,7 @@ const struct iris_platform_data sm8750_data = {
 	.inst_iris_fmts = iris_fmts_vpu3x_dec,
 	.inst_iris_fmts_size = ARRAY_SIZE(iris_fmts_vpu3x_dec),
 	.inst_caps = &platform_inst_cap_sm8550,
+	.slice_caps = &default_slice_caps_vpu3x,
 	.tz_cp_config_data = tz_cp_config_vpu3,
 	.tz_cp_config_data_size = ARRAY_SIZE(tz_cp_config_vpu3),
 	.num_vpp_pipe = 4,
@@ -240,6 +256,7 @@ const struct iris_platform_data x1p42100_data = {
 	.inst_iris_fmts = iris_fmts_vpu3x_dec,
 	.inst_iris_fmts_size = ARRAY_SIZE(iris_fmts_vpu3x_dec),
 	.inst_caps = &platform_inst_cap_sm8550,
+	.slice_caps = &default_slice_caps_vpu3x,
 	.tz_cp_config_data = tz_cp_config_vpu3,
 	.tz_cp_config_data_size = ARRAY_SIZE(tz_cp_config_vpu3),
 	.num_vpp_pipe = 1,

-- 
2.34.1

Re: [PATCH v4 3/3] media: iris: add support for multi_slice in iris encoder

[Vikash Garodia]

On 7/23/2026 3:51 PM, Sachin Kumar Garg wrote:
> Add multi-slice encoding support with MAX_MB and MAX_BYTES modes.
> 
> Clients can enable slice mode using V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE
> control and configure slice size via V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB
> or V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES controls.
> 
> Signed-off-by: Sachin Kumar Garg <sachin.garg@oss.qualcomm.com>
> ---
>   drivers/media/platform/qcom/iris/iris_ctrls.c      | 79 ++++++++++++++++++++++
>   drivers/media/platform/qcom/iris/iris_ctrls.h      |  1 +
>   drivers/media/platform/qcom/iris/iris_hfi_gen2.c   | 33 ++++++++-
>   .../platform/qcom/iris/iris_hfi_gen2_defines.h     |  2 +
>   .../platform/qcom/iris/iris_platform_common.h      | 16 +++++
>   .../media/platform/qcom/iris/iris_platform_vpu3x.c | 17 +++++
>   6 files changed, 147 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/qcom/iris/iris_ctrls.c b/drivers/media/platform/qcom/iris/iris_ctrls.c
> index d7cbf6c3614a..ed7ed4b89a5a 100644
> --- a/drivers/media/platform/qcom/iris/iris_ctrls.c
> +++ b/drivers/media/platform/qcom/iris/iris_ctrls.c
> @@ -154,6 +154,12 @@ static enum platform_inst_fw_cap_type iris_get_cap_id(u32 id)
>   		return LAYER4_BITRATE_HEVC;
>   	case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L5_BR:
>   		return LAYER5_BITRATE_HEVC;
> +	case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
> +		return SLICE_MODE;
> +	case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES:
> +		return SLICE_MAX_BYTES;
> +	case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB:
> +		return SLICE_MAX_MB;
>   	default:
>   		return INST_FW_CAP_MAX;
>   	}
> @@ -297,6 +303,12 @@ static u32 iris_get_v4l2_id(enum platform_inst_fw_cap_type cap_id)
>   		return V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L4_BR;
>   	case LAYER5_BITRATE_HEVC:
>   		return V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L5_BR;
> +	case SLICE_MODE:
> +		return V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE;
> +	case SLICE_MAX_BYTES:
> +		return V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES;
> +	case SLICE_MAX_MB:
> +		return V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB;
>   	default:
>   		return 0;
>   	}
> @@ -1482,6 +1494,73 @@ int iris_set_layer_bitrate(struct iris_inst *inst, enum platform_inst_fw_cap_typ
>   					     &bitrate, sizeof(u32));
>   }
>   
> +int iris_set_slice_count(struct iris_inst *inst, enum platform_inst_fw_cap_type cap_id)
> +{
> +	const struct iris_hfi_session_ops *hfi_ops = inst->hfi_session_ops;
> +	const struct platform_inst_slice_caps *slice_caps =
> +		inst->core->iris_platform_data->slice_caps;
> +	u32 slice_mode = inst->fw_caps[SLICE_MODE].value;

..[cap_id].value;

> +	u32 bitrate = inst->fw_caps[BITRATE].value;

if used only once, can be used directly instead of a new variable.

> +	u32 rc_type = inst->hfi_rc_type;
> +	u32 fps = inst->frame_rate;
> +	u32 output_width = inst->fmt_dst->fmt.pix_mp.width;
> +	u32 output_height = inst->fmt_dst->fmt.pix_mp.height;
> +	u32 mbpf = NUM_MBS_PER_FRAME(output_height, output_width);
> +	u32 max_width, max_height, min_width, min_height;
> +	u32 max_avg_slicesize, hfi_value, hfi_id;

follow reverse christmas tree

> +
> +	if (slice_mode == V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_SINGLE) {
> +		dev_dbg(inst->core->dev, "slice mode is: %u, ignore setting to fw\n", slice_mode);

we know here that the logic returned due to single slice, print it 
directly saying the same, there is no other possibility.

> +		return 0;
> +	}
> +	if (fps > slice_caps->max_slice_frame_rate ||
> +	    (rc_type != HFI_RC_OFF && rc_type != HFI_RC_CBR_CFR &&
> +	    rc_type != HFI_RC_CBR_VFR && rc_type != HFI_RC_VBR_CFR)) {
> +		dev_err(inst->core->dev, "slice unsupported, fps: %u, rc_type: %#x\n",
> +			fps, rc_type);
> +		return -EINVAL;
> +	}
> +
> +	max_width = (slice_mode == V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_MB) ?
> +			slice_caps->max_mb_slice_width : slice_caps->max_bytes_slice_width;
> +	max_height = (slice_mode == V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_MB) ?
> +			slice_caps->max_mb_slice_height : slice_caps->max_bytes_slice_height;
> +	min_width = (inst->codec == V4L2_PIX_FMT_HEVC) ?
> +			slice_caps->min_hevc_slice_width : slice_caps->min_avc_slice_width;
> +	min_height = slice_caps->min_slice_height;
> +
> +	if (output_width < min_width || output_height < min_height ||
> +	    output_width > max_width || output_height > max_height) {
> +		dev_err(inst->core->dev, "slice unsupported, codec: %#x wxh: [%dx%d]\n",
> +			inst->codec, output_width, output_height);
> +		return -EINVAL;
> +	}
> +
> +	if (slice_mode == V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_MB) {
> +		hfi_value = inst->fw_caps[SLICE_MAX_MB].value;
> +		hfi_value = max(hfi_value, DIV_ROUND_UP(mbpf, slice_caps->max_slices_per_frame));
> +		if (inst->codec == V4L2_PIX_FMT_HEVC)
> +			hfi_value = (hfi_value + 3) / 4;
> +		hfi_id = inst->fw_caps[SLICE_MAX_MB].hfi_id;
> +	} else if (slice_mode == V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_BYTES) {
> +		hfi_value = inst->fw_caps[SLICE_MAX_BYTES].value;
> +		if (rc_type != HFI_RC_OFF) {
> +			max_avg_slicesize = DIV_ROUND_UP((bitrate / fps) / 8,
> +							 slice_caps->max_slices_per_frame);
> +			hfi_value = max(hfi_value, max_avg_slicesize);
> +		}

for RC_OFF case, the value would be 512 and could lead to huge number of 
slice per frame. Could you check if thats the desired case ?

> +		hfi_id = inst->fw_caps[SLICE_MAX_BYTES].hfi_id;
> +	} else {
> +		return -EINVAL;
> +	}
> +
> +	return hfi_ops->session_set_property(inst, hfi_id,
> +					     HFI_HOST_FLAGS_NONE,
> +					     iris_get_port_info(inst, cap_id),
> +					     HFI_PAYLOAD_U32,
> +					     &hfi_value, sizeof(u32));
> +}
> +
>   int iris_set_properties(struct iris_inst *inst, u32 plane)
>   {
>   	const struct iris_hfi_session_ops *hfi_ops = inst->hfi_session_ops;
> diff --git a/drivers/media/platform/qcom/iris/iris_ctrls.h b/drivers/media/platform/qcom/iris/iris_ctrls.h
> index 3c462ec9190b..5a73c7c49d36 100644
> --- a/drivers/media/platform/qcom/iris/iris_ctrls.h
> +++ b/drivers/media/platform/qcom/iris/iris_ctrls.h
> @@ -47,6 +47,7 @@ int iris_set_layer_type(struct iris_inst *inst, enum platform_inst_fw_cap_type c
>   int iris_set_layer_count_gen1(struct iris_inst *inst, enum platform_inst_fw_cap_type cap_id);
>   int iris_set_layer_count_gen2(struct iris_inst *inst, enum platform_inst_fw_cap_type cap_id);
>   int iris_set_layer_bitrate(struct iris_inst *inst, enum platform_inst_fw_cap_type cap_id);
> +int iris_set_slice_count(struct iris_inst *inst, enum platform_inst_fw_cap_type cap_id);
>   int iris_set_properties(struct iris_inst *inst, u32 plane);
>   
>   #endif
> diff --git a/drivers/media/platform/qcom/iris/iris_hfi_gen2.c b/drivers/media/platform/qcom/iris/iris_hfi_gen2.c
> index acc0ed8adda1..fcbebced05c3 100644
> --- a/drivers/media/platform/qcom/iris/iris_hfi_gen2.c
> +++ b/drivers/media/platform/qcom/iris/iris_hfi_gen2.c
> @@ -12,6 +12,8 @@
>   
>   #define VIDEO_ARCH_LX 1
>   #define BITRATE_MAX				245000000
> +#define MAX_SLICE_MB_SIZE         \
> +	(((4096 + 15) >> 4) * ((2160 + 15) >> 4))
>   
>   static const struct platform_inst_fw_cap inst_fw_cap_sm8550_dec[] = {
>   	{
> @@ -937,7 +939,36 @@ static const struct platform_inst_fw_cap inst_fw_cap_sm8550_enc[] = {
>   		.flags = CAP_FLAG_OUTPUT_PORT | CAP_FLAG_INPUT_PORT |
>   			CAP_FLAG_DYNAMIC_ALLOWED,
>   		.set = iris_set_layer_bitrate,
> -	}
> +	},
> +	{
> +		.cap_id = SLICE_MODE,
> +		.min = V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_SINGLE,
> +		.max = V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_BYTES,
> +		.step_or_mask = BIT(V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_SINGLE) |
> +					BIT(V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_MB) |
> +					BIT(V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_BYTES),
> +		.value = V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_SINGLE,
> +		.flags = CAP_FLAG_OUTPUT_PORT | CAP_FLAG_MENU,
> +		.set = iris_set_slice_count,
> +	},
> +	{
> +		.cap_id = SLICE_MAX_BYTES,
> +		.min = 512,
> +		.max = BITRATE_MAX >> 3,
> +		.step_or_mask = 1,
> +		.value = 512,

refer my above comment on rc_off aspect.

> +		.hfi_id = HFI_PROP_MULTI_SLICE_BYTES_COUNT,
> +		.flags = CAP_FLAG_OUTPUT_PORT,
> +	},
> +	{
> +		.cap_id = SLICE_MAX_MB,
> +		.min = 1,
> +		.max = MAX_SLICE_MB_SIZE,
> +		.step_or_mask = 1,
> +		.value = 1,
> +		.hfi_id = HFI_PROP_MULTI_SLICE_MB_COUNT,
> +		.flags = CAP_FLAG_OUTPUT_PORT,
> +	},
>   };
>   
>   static const u32 sm8550_vdec_input_config_params_default[] = {
> diff --git a/drivers/media/platform/qcom/iris/iris_hfi_gen2_defines.h b/drivers/media/platform/qcom/iris/iris_hfi_gen2_defines.h
> index 776b21cd11b2..226894b99dcc 100644
> --- a/drivers/media/platform/qcom/iris/iris_hfi_gen2_defines.h
> +++ b/drivers/media/platform/qcom/iris/iris_hfi_gen2_defines.h
> @@ -71,6 +71,8 @@ enum hfi_rate_control {
>   #define HFI_PROP_MIN_QP_PACKED			0x0300012f
>   #define HFI_PROP_MAX_QP_PACKED			0x03000130
>   #define HFI_PROP_IR_RANDOM_PERIOD		0x03000131
> +#define HFI_PROP_MULTI_SLICE_MB_COUNT		0x03000132
> +#define HFI_PROP_MULTI_SLICE_BYTES_COUNT	0x03000133
>   #define HFI_PROP_LTR_COUNT			0x03000134
>   #define HFI_PROP_LTR_MARK			0x03000135
>   #define HFI_PROP_LTR_USE			0x03000136
> diff --git a/drivers/media/platform/qcom/iris/iris_platform_common.h b/drivers/media/platform/qcom/iris/iris_platform_common.h
> index c9256f2323dc..ad9f2b20cd90 100644
> --- a/drivers/media/platform/qcom/iris/iris_platform_common.h
> +++ b/drivers/media/platform/qcom/iris/iris_platform_common.h
> @@ -88,6 +88,18 @@ struct tz_cp_config {
>   	u32 cp_nonpixel_size;
>   };
>   
> +struct platform_inst_slice_caps {
> +	u32 max_slices_per_frame;
> +	u32 max_slice_frame_rate;
> +	u32 max_mb_slice_width;
> +	u32 max_mb_slice_height;
> +	u32 max_bytes_slice_width;
> +	u32 max_bytes_slice_height;
> +	u32 min_hevc_slice_width;
> +	u32 min_avc_slice_width;
> +	u32 min_slice_height;
> +};
> +
>   struct platform_inst_caps {
>   	u32 min_frame_width;
>   	u32 max_frame_width;
> @@ -183,6 +195,9 @@ enum platform_inst_fw_cap_type {
>   	LAYER3_BITRATE_HEVC,
>   	LAYER4_BITRATE_HEVC,
>   	LAYER5_BITRATE_HEVC,
> +	SLICE_MODE,
> +	SLICE_MAX_BYTES,
> +	SLICE_MAX_MB,
>   	INST_FW_CAP_MAX,
>   };
>   
> @@ -315,6 +330,7 @@ struct iris_platform_data {
>   	const u32 *inst_iris_fmts;
>   	u32 inst_iris_fmts_size;
>   	struct platform_inst_caps *inst_caps;
> +	const struct platform_inst_slice_caps *slice_caps;
>   	const struct tz_cp_config *tz_cp_config_data;
>   	u32 tz_cp_config_data_size;
>   	u32 num_vpp_pipe;
> diff --git a/drivers/media/platform/qcom/iris/iris_platform_vpu3x.c b/drivers/media/platform/qcom/iris/iris_platform_vpu3x.c
> index 2c63adbc5579..6e44bed5ebff 100644
> --- a/drivers/media/platform/qcom/iris/iris_platform_vpu3x.c
> +++ b/drivers/media/platform/qcom/iris/iris_platform_vpu3x.c
> @@ -12,6 +12,18 @@
>   #include "iris_vpu_buffer.h"
>   #include "iris_vpu_common.h"
>   
> +static const struct platform_inst_slice_caps default_slice_caps_vpu3x = {
> +	.max_slices_per_frame = 128,
> +	.max_slice_frame_rate = 60,
> +	.max_mb_slice_width = 4096,
> +	.max_mb_slice_height = 2160,
> +	.max_bytes_slice_width = 1920,
> +	.max_bytes_slice_height = 1088,
> +	.min_hevc_slice_width = 384,
> +	.min_avc_slice_width = 192,
> +	.min_slice_height = 128,
> +};
> +
>   #include "iris_platform_qcs8300.h"
>   #include "iris_platform_sm8550.h"
>   #include "iris_platform_sm8650.h"
> @@ -110,6 +122,7 @@ const struct iris_platform_data qcs8300_data = {
>   	.inst_iris_fmts = iris_fmts_vpu3x_dec,
>   	.inst_iris_fmts_size = ARRAY_SIZE(iris_fmts_vpu3x_dec),
>   	.inst_caps = &platform_inst_cap_qcs8300,
> +	.slice_caps = &default_slice_caps_vpu3x,

please keep it as slice_caps_.., drop the default keyword to keep it 
consistent with others.

>   	.tz_cp_config_data = tz_cp_config_vpu3,
>   	.tz_cp_config_data_size = ARRAY_SIZE(tz_cp_config_vpu3),
>   	.num_vpp_pipe = 2,
> @@ -139,6 +152,7 @@ const struct iris_platform_data sm8550_data = {
>   	.inst_iris_fmts = iris_fmts_vpu3x_dec,
>   	.inst_iris_fmts_size = ARRAY_SIZE(iris_fmts_vpu3x_dec),
>   	.inst_caps = &platform_inst_cap_sm8550,
> +	.slice_caps = &default_slice_caps_vpu3x,
>   	.tz_cp_config_data = tz_cp_config_vpu3,
>   	.tz_cp_config_data_size = ARRAY_SIZE(tz_cp_config_vpu3),
>   	.num_vpp_pipe = 4,
> @@ -176,6 +190,7 @@ const struct iris_platform_data sm8650_data = {
>   	.inst_iris_fmts = iris_fmts_vpu3x_dec,
>   	.inst_iris_fmts_size = ARRAY_SIZE(iris_fmts_vpu3x_dec),
>   	.inst_caps = &platform_inst_cap_sm8550,
> +	.slice_caps = &default_slice_caps_vpu3x,
>   	.tz_cp_config_data = tz_cp_config_vpu3,
>   	.tz_cp_config_data_size = ARRAY_SIZE(tz_cp_config_vpu3),
>   	.num_vpp_pipe = 4,
> @@ -205,6 +220,7 @@ const struct iris_platform_data sm8750_data = {
>   	.inst_iris_fmts = iris_fmts_vpu3x_dec,
>   	.inst_iris_fmts_size = ARRAY_SIZE(iris_fmts_vpu3x_dec),
>   	.inst_caps = &platform_inst_cap_sm8550,
> +	.slice_caps = &default_slice_caps_vpu3x,
>   	.tz_cp_config_data = tz_cp_config_vpu3,
>   	.tz_cp_config_data_size = ARRAY_SIZE(tz_cp_config_vpu3),
>   	.num_vpp_pipe = 4,
> @@ -240,6 +256,7 @@ const struct iris_platform_data x1p42100_data = {
>   	.inst_iris_fmts = iris_fmts_vpu3x_dec,
>   	.inst_iris_fmts_size = ARRAY_SIZE(iris_fmts_vpu3x_dec),
>   	.inst_caps = &platform_inst_cap_sm8550,
> +	.slice_caps = &default_slice_caps_vpu3x,
>   	.tz_cp_config_data = tz_cp_config_vpu3,
>   	.tz_cp_config_data_size = ARRAY_SIZE(tz_cp_config_vpu3),
>   	.num_vpp_pipe = 1,
> 

Regards,
Vikash