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Message-ID: <a538052a-fc4e-496b-ae71-033ff8d87204@linaro.org>
Date: Mon, 16 Jun 2025 09:13:08 +0100
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Jorge Ramirez <jorge.ramirez@....qualcomm.com>
Cc: quic_vgarodia@...cinc.com, quic_dikshita@...cinc.com, mchehab@...nel.org,
robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
stanimir.varbanov@...aro.org, linux-arm-msm@...r.kernel.org,
linux-media@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5] media: venus: vdec: ar50_lite video core support
On 15/06/2025 12:38, Jorge Ramirez wrote:
> On 13/06/25 15:18:02, Bryan O'Donoghue wrote:
>> On 13/06/2025 15:04, Jorge Ramirez-Ortiz wrote:
>>> The AR50_LITE is a streamlined variant of the AR50 video core, designed
>>> for power and cost-efficient platforms.
>>>
>>> It supports hardware-accelerated decoding of H.264, HEVC, and VP9
>>> formats.
>>>
>>> Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez@....qualcomm.com>
>>> ---
>>> drivers/media/platform/qcom/venus/core.c | 11 ++-
>>> drivers/media/platform/qcom/venus/core.h | 5 +-
>>> drivers/media/platform/qcom/venus/firmware.c | 8 +-
>>> drivers/media/platform/qcom/venus/helpers.c | 81 +++++++++++++++++++
>>> drivers/media/platform/qcom/venus/helpers.h | 2 +
>>> .../media/platform/qcom/venus/hfi_helper.h | 10 ++-
>>> drivers/media/platform/qcom/venus/hfi_venus.c | 14 ++--
>>> .../media/platform/qcom/venus/pm_helpers.c | 1 +
>>> drivers/media/platform/qcom/venus/vdec.c | 15 ++--
>>> 9 files changed, 123 insertions(+), 24 deletions(-)
>>>
>>> diff --git a/drivers/media/platform/qcom/venus/core.c b/drivers/media/platform/qcom/venus/core.c
>>> index d305d74bb152..736ef53d988d 100644
>>> --- a/drivers/media/platform/qcom/venus/core.c
>>> +++ b/drivers/media/platform/qcom/venus/core.c
>>> @@ -254,14 +254,19 @@ static int venus_enumerate_codecs(struct venus_core *core, u32 type)
>>> static void venus_assign_register_offsets(struct venus_core *core)
>>> {
>>> - if (IS_IRIS2(core) || IS_IRIS2_1(core)) {
>>> - core->vbif_base = core->base + VBIF_BASE;
>>> + if (IS_IRIS2(core) || IS_IRIS2_1(core) || IS_AR50_LITE(core)) {
>>
>> Is there a property that IS_IRIS_2_1 || IS_AR50_LITE that we could use
>> instead of expanding this IS_THING list ?
>
> I know what you mean but I think looking for possible comonalities
> between cores will just make the partitioning more obscure.
>
> we could perhaps define a different type of macro ie, something like
> IS_CORE(core, IRIS2, IRIS2_1, AR50_LITE) ? shall I go ahead with this
> type of macro instead?
It feels like a nit-picky point to be making but, I'm just thinking
about adding another say two or three SoCs that need this conditional.
In that case this statement would start to look long and ungainley. It
would be nice to come up with some common conditional for it.
>>
>>
>>> core->cpu_base = core->base + CPU_BASE_V6;
>>> core->cpu_cs_base = core->base + CPU_CS_BASE_V6;
>>> core->cpu_ic_base = core->base + CPU_IC_BASE_V6;
>>> core->wrapper_base = core->base + WRAPPER_BASE_V6;
>>> core->wrapper_tz_base = core->base + WRAPPER_TZ_BASE_V6;
>>> - core->aon_base = core->base + AON_BASE_V6;
>>> + if (IS_AR50_LITE(core)) {
>>> + core->vbif_base = NULL;
>>> + core->aon_base = NULL;
>>> + } else {
>>> + core->vbif_base = core->base + VBIF_BASE;
>>> + core->aon_base = core->base + AON_BASE_V6;
>>> + }
>>> } else {
>>> core->vbif_base = core->base + VBIF_BASE;
>>> core->cpu_base = core->base + CPU_BASE;
>>> diff --git a/drivers/media/platform/qcom/venus/core.h b/drivers/media/platform/qcom/venus/core.h
>>> index b412e0c5515a..122441f9600a 100644
>>> --- a/drivers/media/platform/qcom/venus/core.h
>>> +++ b/drivers/media/platform/qcom/venus/core.h
>>> @@ -382,6 +382,7 @@ enum venus_inst_modes {
>>> * @lock: instance lock
>>> * @core: a reference to the core struct
>>> * @clk_data: clock data per core ID
>>> + * @eosbufs: a lit of EOS buffers
>>> * @dpbbufs: a list of decoded picture buffers
>>> * @internalbufs: a list of internal bufferes
>>> * @registeredbufs: a list of registered capture bufferes
>>> @@ -450,6 +451,7 @@ struct venus_inst {
>>> struct mutex lock;
>>> struct venus_core *core;
>>> struct clock_data clk_data;
>>> + struct list_head eosbufs;
>>> struct list_head dpbbufs;
>>> struct list_head internalbufs;
>>> struct list_head registeredbufs;
>>> @@ -520,7 +522,8 @@ struct venus_inst {
>>> #define IS_V1(core) ((core)->res->hfi_version == HFI_VERSION_1XX)
>>> #define IS_V3(core) ((core)->res->hfi_version == HFI_VERSION_3XX)
>>> #define IS_V4(core) ((core)->res->hfi_version == HFI_VERSION_4XX)
>>> -#define IS_V6(core) ((core)->res->hfi_version == HFI_VERSION_6XX)
>>> +#define IS_V6(core) (((core)->res->hfi_version == HFI_VERSION_6XX) || \
>>> + ((core)->res->hfi_version == HFI_VERSION_6XX_LITE))
>>> #define IS_AR50(core) ((core)->res->vpu_version == VPU_VERSION_AR50)
>>> #define IS_AR50_LITE(core) ((core)->res->vpu_version == VPU_VERSION_AR50_LITE)
>>> diff --git a/drivers/media/platform/qcom/venus/firmware.c b/drivers/media/platform/qcom/venus/firmware.c
>>> index 66a18830e66d..f8dcef0426ac 100644
>>> --- a/drivers/media/platform/qcom/venus/firmware.c
>>> +++ b/drivers/media/platform/qcom/venus/firmware.c
>>> @@ -30,7 +30,7 @@ static void venus_reset_cpu(struct venus_core *core)
>>> u32 fw_size = core->fw.mapped_mem_size;
>>> void __iomem *wrapper_base;
>>> - if (IS_IRIS2_1(core))
>>> + if (IS_IRIS2_1(core) || IS_AR50_LITE(core))
>>
>> For example here.
>>
>>> wrapper_base = core->wrapper_tz_base;
>>> else
>>> wrapper_base = core->wrapper_base;
>>> @@ -42,7 +42,7 @@ static void venus_reset_cpu(struct venus_core *core)
>>> writel(fw_size, wrapper_base + WRAPPER_NONPIX_START_ADDR);
>>> writel(fw_size, wrapper_base + WRAPPER_NONPIX_END_ADDR);
>>> - if (IS_IRIS2_1(core)) {
>>> + if (IS_IRIS2_1(core) || IS_AR50_LITE(core)) {
>>> /* Bring XTSS out of reset */
>>> writel(0, wrapper_base + WRAPPER_TZ_XTSS_SW_RESET);
>>> } else {
>>> @@ -68,7 +68,7 @@ int venus_set_hw_state(struct venus_core *core, bool resume)
>>> if (resume) {
>>> venus_reset_cpu(core);
>>> } else {
>>> - if (IS_IRIS2_1(core))
>>> + if (IS_IRIS2_1(core) || IS_AR50_LITE(core))
>>> writel(WRAPPER_XTSS_SW_RESET_BIT,
>>> core->wrapper_tz_base + WRAPPER_TZ_XTSS_SW_RESET);
>>> else
>>> @@ -181,7 +181,7 @@ static int venus_shutdown_no_tz(struct venus_core *core)
>>> void __iomem *wrapper_base = core->wrapper_base;
>>> void __iomem *wrapper_tz_base = core->wrapper_tz_base;
>>> - if (IS_IRIS2_1(core)) {
>>> + if (IS_IRIS2_1(core) || IS_AR50_LITE(core)) {
>>> /* Assert the reset to XTSS */
>>> reg = readl(wrapper_tz_base + WRAPPER_TZ_XTSS_SW_RESET);
>>> reg |= WRAPPER_XTSS_SW_RESET_BIT;
>>> diff --git a/drivers/media/platform/qcom/venus/helpers.c b/drivers/media/platform/qcom/venus/helpers.c
>>> index 8295542e1a7c..ae89369c6a07 100644
>>> --- a/drivers/media/platform/qcom/venus/helpers.c
>>> +++ b/drivers/media/platform/qcom/venus/helpers.c
>>> @@ -230,6 +230,80 @@ int venus_helper_alloc_dpb_bufs(struct venus_inst *inst)
>>> }
>>> EXPORT_SYMBOL_GPL(venus_helper_alloc_dpb_bufs);
>>> +static void free_eos_buf(struct venus_inst *inst, struct intbuf *buf)
>>> +{
>>> + list_del_init(&buf->list);
>>> + dma_free_attrs(inst->core->dev, buf->size, buf->va, buf->da,
>>> + buf->attrs);
>>> + kfree(buf);
>>> +}
>>> +
>>> +int venus_helper_free_eos_bufs(struct venus_inst *inst)
>>> +{
>>> + struct intbuf *buf, *n;
>>> +
>>> + list_for_each_entry_safe(buf, n, &inst->eosbufs, list) {
>>> + free_eos_buf(inst, buf);
>>> + }
>>> +
>>> + if (list_empty(&inst->eosbufs))
>>> + INIT_LIST_HEAD(&inst->eosbufs);
>>> +
>>> + return 0;
>>> +
>>> +}
>>> +EXPORT_SYMBOL_GPL(venus_helper_free_eos_bufs);
>>
>> These EOS buf things look like they are not specific to ar50, could you add
>> these in a preceding patch to this ?
>
> um, previous cores seemed to tolerate passing empty pointers to the VPU
> firmware without issue. Unfortunately, with the AR50_LITE, this results
> in segmentation faults in the _firmware_. The purpose of this function is
> to add support for AR50_LITE while preserving the existing behaviour for
> other cores...introducing a dedicated function felt cleaner than
> further complicating the existing conditional.
> Given that the previous conditional was just an if/else I don’t really
> see a lot of benefit in refactoring the earlier conditionals _before_
> adding the AR50_LITE logic. Would you be OK if we keep it as proposed?
ok
>
>>
>>> +
>>> +int venus_helper_alloc_eos_buf(struct venus_inst *inst,
>>> + struct hfi_frame_data *data)
>>> +{
>>> + struct venus_core *core = inst->core;
>>> + struct device *dev = core->dev;
>>> + struct intbuf *buf;
>>> + int ret = 0;
>>> +
>>> + memset(data, 0, sizeof(*data));
>>> +
>>> + data->buffer_type = HFI_BUFFER_INPUT;
>>> + data->flags = HFI_BUFFERFLAG_EOS;
>>> +
>>> + if (IS_AR50_LITE(inst->core)) {
>>> + /* We must send valid sizes and addresses */
>>> + buf = kzalloc(sizeof(*buf), GFP_KERNEL);
>>> + if (!buf) {
>>> + ret = -ENOMEM;
>>> + goto fail;
>>> + }
>>> +
>>> + buf->type = HFI_BUFFER_INPUT;
>>> + buf->size = SZ_4K;
>>> + buf->attrs = DMA_ATTR_NO_KERNEL_MAPPING;
>>> + buf->va = dma_alloc_attrs(dev, buf->size, &buf->da, GFP_KERNEL,
>>> + buf->attrs);
>>> + if (!buf->va) {
>>> + ret = -ENOMEM;
>>> + goto fail;
>>> + }
>>> +
>>> + list_add_tail(&buf->list, &inst->eosbufs);
>>> +
>>> + data->alloc_len = buf->size;
>>> + data->device_addr = buf->da;
>>> +
>>> + } else if (IS_V6(inst->core) &&
>>> + is_fw_rev_or_older(inst->core, 1, 0, 87)) {
>>> + data->device_addr = 0;
>>> + } else {
>>> + data->device_addr = 0xdeadb000;
>>> + }
>>> +
>>> + return 0;
>>> +fail:
>>> + kfree(buf);
>>> + return ret;
>>> +}
>>> +EXPORT_SYMBOL_GPL(venus_helper_alloc_eos_buf);
>>
>> I think the series would be nicer if the EOS buf decomposition stuff went
>> into a patch that preceded this one, and then you add the IS_AR50_LITE() in
>> the next patch progressively.
>
> see above
>
>>
>>> +
>>> static int intbufs_set_buffer(struct venus_inst *inst, u32 type)
>>> {
>>> struct venus_core *core = inst->core;
>>> @@ -630,6 +704,13 @@ static int platform_get_bufreq(struct venus_inst *inst, u32 buftype,
>>> if (!hfi_plat || !hfi_plat->bufreq)
>>> return -EINVAL;
>>> + /* Firmware buffer requirements for internal buffers only */
>>> + if (IS_AR50_LITE(inst->core))
>>> + if ((buftype != HFI_BUFFER_INPUT) &&
>>> + (buftype != HFI_BUFFER_OUTPUT) &&
>>> + (buftype != HFI_BUFFER_OUTPUT2))
>>> + return -EINVAL;
>>> +
>>> params.version = version;
>>> params.num_vpp_pipes = inst->core->res->num_vpp_pipes;
>>> diff --git a/drivers/media/platform/qcom/venus/helpers.h b/drivers/media/platform/qcom/venus/helpers.h
>>> index 358e4f39c9c0..bf55fe3b8747 100644
>>> --- a/drivers/media/platform/qcom/venus/helpers.h
>>> +++ b/drivers/media/platform/qcom/venus/helpers.h
>>> @@ -58,6 +58,8 @@ int venus_helper_get_out_fmts(struct venus_inst *inst, u32 fmt, u32 *out_fmt,
>>> bool venus_helper_check_format(struct venus_inst *inst, u32 v4l2_pixfmt);
>>> int venus_helper_alloc_dpb_bufs(struct venus_inst *inst);
>>> int venus_helper_free_dpb_bufs(struct venus_inst *inst);
>>> +int venus_helper_alloc_eos_buf(struct venus_inst *inst, struct hfi_frame_data *data);
>>> +int venus_helper_free_eos_bufs(struct venus_inst *inst);
>>> int venus_helper_intbufs_alloc(struct venus_inst *inst);
>>> int venus_helper_intbufs_free(struct venus_inst *inst);
>>> int venus_helper_intbufs_realloc(struct venus_inst *inst);
>>> diff --git a/drivers/media/platform/qcom/venus/hfi_helper.h b/drivers/media/platform/qcom/venus/hfi_helper.h
>>> index f44059f19505..128ddf8e3cd5 100644
>>> --- a/drivers/media/platform/qcom/venus/hfi_helper.h
>>> +++ b/drivers/media/platform/qcom/venus/hfi_helper.h
>>> @@ -397,13 +397,16 @@
>>> #define HFI_BUFFER_INTERNAL_PERSIST_1 0x5
>>> #define HFI_BUFFER_INTERNAL_SCRATCH(ver) \
>>> (((ver) == HFI_VERSION_4XX || \
>>> - (ver) == HFI_VERSION_6XX) ? 0x6 : 0x1000001)
>>> + (ver) == HFI_VERSION_6XX || (ver) == HFI_VERSION_6XX_LITE) \
>>> + ? 0x6 : 0x1000001)
>>> #define HFI_BUFFER_INTERNAL_SCRATCH_1(ver) \
>>> (((ver) == HFI_VERSION_4XX || \
>>> - (ver) == HFI_VERSION_6XX) ? 0x7 : 0x1000005)
>>> + (ver) == HFI_VERSION_6XX || (ver) == HFI_VERSION_6XX_LITE) \
>>> + ? 0x7 : 0x1000005)
>>> #define HFI_BUFFER_INTERNAL_SCRATCH_2(ver) \
>>> (((ver) == HFI_VERSION_4XX || \
>>> - (ver) == HFI_VERSION_6XX) ? 0x8 : 0x1000006)
>>> + (ver) == HFI_VERSION_6XX || (ver) == HFI_VERSION_6XX_LITE) \
>>> + ? 0x8 : 0x1000006)
>>> #define HFI_BUFFER_EXTRADATA_INPUT(ver) \
>>> (((ver) == HFI_VERSION_4XX) ? 0xc : 0x1000002)
>>> #define HFI_BUFFER_EXTRADATA_OUTPUT(ver) \
>>> @@ -561,6 +564,7 @@ enum hfi_version {
>>> HFI_VERSION_3XX,
>>> HFI_VERSION_4XX,
>>> HFI_VERSION_6XX,
>>> + HFI_VERSION_6XX_LITE,
>>> };
>>> struct hfi_buffer_info {
>>> diff --git a/drivers/media/platform/qcom/venus/hfi_venus.c b/drivers/media/platform/qcom/venus/hfi_venus.c
>>> index b5f2ea879950..302776bf8fe6 100644
>>> --- a/drivers/media/platform/qcom/venus/hfi_venus.c
>>> +++ b/drivers/media/platform/qcom/venus/hfi_venus.c
>>> @@ -497,7 +497,7 @@ static int venus_boot_core(struct venus_hfi_device *hdev)
>>> if (count >= max_tries)
>>> ret = -ETIMEDOUT;
>>> - if (IS_IRIS2(hdev->core) || IS_IRIS2_1(hdev->core)) {
>>> + if (IS_IRIS2(hdev->core) || IS_IRIS2_1(hdev->core) || IS_AR50_LITE(hdev->core)) {
>>> writel(0x1, cpu_cs_base + CPU_CS_H2XSOFTINTEN_V6);
>>> writel(0x0, cpu_cs_base + CPU_CS_X2RPMH_V6);
>>> }
>>> @@ -565,6 +565,9 @@ static int venus_halt_axi(struct venus_hfi_device *hdev)
>>> u32 mask_val;
>>> int ret;
>>> + if (IS_AR50_LITE(hdev->core))
>>> + return 0;
>>> +
>>> if (IS_IRIS2(hdev->core) || IS_IRIS2_1(hdev->core)) {
>>> writel(0x3, cpu_cs_base + CPU_CS_X2RPMH_V6);
>>> @@ -1134,7 +1137,8 @@ static irqreturn_t venus_isr(struct venus_core *core)
>>> wrapper_base = hdev->core->wrapper_base;
>>> status = readl(wrapper_base + WRAPPER_INTR_STATUS);
>>> - if (IS_IRIS2(core) || IS_IRIS2_1(core)) {
>>> +
>>> + if (IS_IRIS2(core) || IS_IRIS2_1(core) || IS_AR50_LITE(core)) {
>>> if (status & WRAPPER_INTR_STATUS_A2H_MASK ||
>>> status & WRAPPER_INTR_STATUS_A2HWD_MASK_V6 ||
>>> status & CPU_CS_SCIACMDARG0_INIT_IDLE_MSG_MASK)
>>> @@ -1146,7 +1150,7 @@ static irqreturn_t venus_isr(struct venus_core *core)
>>> hdev->irq_status = status;
>>> }
>>> writel(1, cpu_cs_base + CPU_CS_A2HSOFTINTCLR);
>>> - if (!(IS_IRIS2(core) || IS_IRIS2_1(core)))
>>> + if (!(IS_IRIS2(core) || IS_IRIS2_1(core) || IS_AR50_LITE(core)))
>>> writel(status, wrapper_base + WRAPPER_INTR_CLEAR);
>>> return IRQ_WAKE_THREAD;
>>> @@ -1531,7 +1535,7 @@ static bool venus_cpu_and_video_core_idle(struct venus_hfi_device *hdev)
>>> void __iomem *cpu_cs_base = hdev->core->cpu_cs_base;
>>> u32 ctrl_status, cpu_status;
>>> - if (IS_IRIS2(hdev->core) || IS_IRIS2_1(hdev->core))
>>> + if (IS_IRIS2(hdev->core) || IS_IRIS2_1(hdev->core) || IS_AR50_LITE(hdev->core))
>>> cpu_status = readl(wrapper_tz_base + WRAPPER_TZ_CPU_STATUS_V6);
>>> else
>>> cpu_status = readl(wrapper_base + WRAPPER_CPU_STATUS);
>>> @@ -1551,7 +1555,7 @@ static bool venus_cpu_idle_and_pc_ready(struct venus_hfi_device *hdev)
>>> void __iomem *cpu_cs_base = hdev->core->cpu_cs_base;
>>> u32 ctrl_status, cpu_status;
>>> - if (IS_IRIS2(hdev->core) || IS_IRIS2_1(hdev->core))
>>> + if (IS_IRIS2(hdev->core) || IS_IRIS2_1(hdev->core) || IS_AR50_LITE(hdev->core))
>>> cpu_status = readl(wrapper_tz_base + WRAPPER_TZ_CPU_STATUS_V6);
>>> else
>>> cpu_status = readl(wrapper_base + WRAPPER_CPU_STATUS);
>>> diff --git a/drivers/media/platform/qcom/venus/pm_helpers.c b/drivers/media/platform/qcom/venus/pm_helpers.c
>>> index 409aa9bd0b5d..5d9dfe3fd043 100644
>>> --- a/drivers/media/platform/qcom/venus/pm_helpers.c
>>> +++ b/drivers/media/platform/qcom/venus/pm_helpers.c
>>> @@ -1168,6 +1168,7 @@ const struct venus_pm_ops *venus_pm_get(enum hfi_version version)
>>> return &pm_ops_v3;
>>> case HFI_VERSION_4XX:
>>> case HFI_VERSION_6XX:
>>> + case HFI_VERSION_6XX_LITE:
>>> return &pm_ops_v4;
>>> }
>>> diff --git a/drivers/media/platform/qcom/venus/vdec.c b/drivers/media/platform/qcom/venus/vdec.c
>>> index 99ce5fd41577..87c7901b280e 100644
>>> --- a/drivers/media/platform/qcom/venus/vdec.c
>>> +++ b/drivers/media/platform/qcom/venus/vdec.c
>>> @@ -550,7 +550,7 @@ vdec_decoder_cmd(struct file *file, void *fh, struct v4l2_decoder_cmd *cmd)
>>> {
>>> struct venus_inst *inst = to_inst(file);
>>> struct vb2_queue *dst_vq;
>>> - struct hfi_frame_data fdata = {0};
>>> + struct hfi_frame_data fdata;
>>> int ret;
>>> ret = v4l2_m2m_ioctl_try_decoder_cmd(file, fh, cmd);
>>> @@ -561,18 +561,15 @@ vdec_decoder_cmd(struct file *file, void *fh, struct v4l2_decoder_cmd *cmd)
>>> if (cmd->cmd == V4L2_DEC_CMD_STOP) {
>>> /*
>>> - * Implement V4L2_DEC_CMD_STOP by enqueue an empty buffer on
>>> + * Implement V4L2_DEC_CMD_STOP by enqueue a buffer on
>>> * decoder input to signal EOS.
>>> */
>>> if (!(inst->streamon_out && inst->streamon_cap))
>>> goto unlock;
>>> - fdata.buffer_type = HFI_BUFFER_INPUT;
>>> - fdata.flags |= HFI_BUFFERFLAG_EOS;
>>> - if (IS_V6(inst->core) && is_fw_rev_or_older(inst->core, 1, 0, 87))
>>> - fdata.device_addr = 0;
>>> - else
>>> - fdata.device_addr = 0xdeadb000;
>>> + ret = venus_helper_alloc_eos_buf(inst, &fdata);
>>> + if (ret)
>>> + goto unlock;
>>> ret = hfi_session_process_buf(inst, &fdata);
>>> @@ -1332,6 +1329,7 @@ static void vdec_session_release(struct venus_inst *inst)
>>> hfi_session_abort(inst);
>>> venus_helper_free_dpb_bufs(inst);
>>> + venus_helper_free_eos_bufs(inst);
>>> venus_pm_load_scale(inst);
>>> INIT_LIST_HEAD(&inst->registeredbufs);
>>> mutex_unlock(&inst->lock);
>>> @@ -1682,6 +1680,7 @@ static int vdec_open(struct file *file)
>>> if (!inst)
>>> return -ENOMEM;
>>> + INIT_LIST_HEAD(&inst->eosbufs);
>>> INIT_LIST_HEAD(&inst->dpbbufs);
>>> INIT_LIST_HEAD(&inst->registeredbufs);
>>> INIT_LIST_HEAD(&inst->internalbufs);
>> Otherwise LGTM.
>>
>> ---
>> bod
>>
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
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