linux-kernel - Re: [PATCH v3 0/5] Introduce "non-pixel" sub node within iris video node

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Message-ID: <25afe22d-5165-4f6f-95a5-09d318b07eec@linaro.org>
Date: Wed, 2 Jul 2025 09:59:31 +0200
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Vikash Garodia <quic_vgarodia@...cinc.com>,
 Dikshita Agarwal <quic_dikshita@...cinc.com>,
 Abhinav Kumar <abhinav.kumar@...ux.dev>,
 Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
 Mauro Carvalho Chehab <mchehab@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>
Cc: linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/5] Introduce "non-pixel" sub node within iris video
 node

On 01/07/2025 18:11, Vikash Garodia wrote:
> 
> On 7/1/2025 6:49 PM, Neil Armstrong wrote:
>> Hi,
>>
>> On 01/07/2025 12:23, Vikash Garodia wrote:
>>>
>>> On 6/30/2025 11:34 PM, neil.armstrong@...aro.org wrote:
>>>> On 27/06/2025 17:48, Vikash Garodia wrote:
>>>>> This series introduces a sub node "non-pixel" within iris video node.
>>>>> Video driver registers this sub node as a platform device and configure
>>>>> it for DMA operations. All non pixel buffers, i.e bitstream, HFI queues
>>>>> and internal buffers related to bitstream processing, would be managed
>>>>> by this non_pixel device.
>>>>>
>>>>> Purpose to add this sub-node:
>>>>> Iris device limits the IOVA to an addressable range of 4GiB, and even
>>>>> within that range, some of the space is used by IO registers, thereby
>>>>> limiting the available IOVA to even lesser. For certain video usecase,
>>>>> this limited range in not sufficient enough, hence it brings the need to
>>>>> extend the possibility of higher IOVA range.
>>>>>
>>>>> Video hardware is designed to emit different stream-ID for pixel and
>>>>> non-pixel buffers, thereby introduce a non-pixel sub node to handle
>>>>> non-pixel stream-ID into a separate platform device.
>>>>> With this, both iris and non-pixel device can have IOVA range of
>>>>> approximately 0-4GiB individually for each device, thereby doubling the
>>>>> range of addressable IOVA.
>>>>>
>>>>> Tested on SM8550 and SA8775p hardwares.
>>>>>
>>>>> Signed-off-by: Vikash Garodia <quic_vgarodia@...cinc.com>
>>>>> ---
>>>>> Changes in v3:
>>>>> - Add info about change in iommus binding (Thanks Krzysztof)
>>>>> - Link to v2:
>>>>> https://lore.kernel.org/r/20250627-video_cb-v2-0-3931c3f49361@quicinc.com
>>>>>
>>>>> Changes in v2:
>>>>> - Add ref to reserve-memory schema and drop it from redefining it in
>>>>> iris schema (Thanks Krzysztof)
>>>>> - Drop underscores and add info about non pixel buffers (Thanks Dmitry)
>>>>> - Link to v1:
>>>>> https://lore.kernel.org/r/20250620-video_cb-v1-0-9bcac1c8800c@quicinc.com
>>>>>
>>>>> ---
>>>>> Vikash Garodia (5):
>>>>>          media: dt-bindings: add non-pixel property in iris schema
>>>>>          media: iris: register and configure non-pixel node as platform device
>>>>>          media: iris: use np_dev as preferred DMA device in HFI queue management
>>>>>          media: iris: select appropriate DMA device for internal buffers
>>>>>          media: iris: configure DMA device for vb2 queue on OUTPUT plane
>>>>>
>>>>>     .../bindings/media/qcom,sm8550-iris.yaml           | 40 ++++++++++++++++-
>>>>>     drivers/media/platform/qcom/iris/iris_buffer.c     | 15 ++++++-
>>>>>     drivers/media/platform/qcom/iris/iris_core.h       |  2 +
>>>>>     drivers/media/platform/qcom/iris/iris_hfi_queue.c  | 20 ++++++---
>>>>>     drivers/media/platform/qcom/iris/iris_probe.c      | 50
>>>>> +++++++++++++++++++++-
>>>>>     drivers/media/platform/qcom/iris/iris_vb2.c        |  4 ++
>>>>>     6 files changed, 119 insertions(+), 12 deletions(-)
>>>>> ---
>>>>> base-commit: 8d2b7fde56597ca912f5daaf3ab58915458ba1fc
>>>>> change-id: 20250619-video_cb-ea872d6e6627
>>>>>
>>>>> Best regards,
>>>>
>>>> I tried the patchset on SM8550 QRD and SM8650 QRD/HDK and the system just
>>>> reboots
>>>> a few millisecond after probing iris, no error messages nor reboot to sahara
>>>> mode.
>>>>
>>>> The DT changeset for reference:
>>>> https://git.codelinaro.org/neil.armstrong/linux/-/commit/e1b3628469c038559a60d310386f006f353e3d59
>>>
>>> I was able to repro this case, the issue was due to a incorrect node name in
>>> driver. Fixing the name as per binding, fixes the issue for me. I have made the
>>> comment in your code branch [1], which should fix it for you as well. Please
>>> share your observations.
>>
>> Indeed, with:
>> ============><========================================
>> diff --git a/arch/arm64/boot/dts/qcom/sm8550.dtsi
>> b/arch/arm64/boot/dts/qcom/sm8550.dtsi
>> index 8da2b780395d..06657b42da49 100644
>> --- a/arch/arm64/boot/dts/qcom/sm8550.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/sm8550.dtsi
>> @@ -3264,6 +3264,9 @@ &config_noc SLAVE_VENUS_CFG QCOM_ICC_TAG_ACTIVE_ONLY>,
>>                          iommus = <&apps_smmu 0x1947 0>;
>>                          dma-coherent;
>>
>> +                       #address-cells = <2>;
>> +                       #size-cells = <2>;
>> +
>>                          /*
>>                           * IRIS firmware is signed by vendors, only
>>                           * enable in boards where the proper signed firmware
>> diff --git a/arch/arm64/boot/dts/qcom/sm8650.dtsi
>> b/arch/arm64/boot/dts/qcom/sm8650.dtsi
>> index b53a9aa5adbf..7ada62ee411e 100644
>> --- a/arch/arm64/boot/dts/qcom/sm8650.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/sm8650.dtsi
>> @@ -5011,6 +5011,9 @@ &config_noc SLAVE_VENUS_CFG QCOM_ICC_TAG_ACTIVE_ONLY>,
>>
>>                          dma-coherent;
>>
>> +                       #address-cells = <2>;
>> +                       #size-cells = <2>;
>> +
>>                          /*
>>                           * IRIS firmware is signed by vendors, only
>>                           * enable in boards where the proper signed firmware
>> diff --git a/drivers/media/platform/qcom/iris/iris_probe.c
>> b/drivers/media/platform/qcom/iris/iris_probe.c
>> index 8fe87e30bd40..c57645a60bc4 100644
>> --- a/drivers/media/platform/qcom/iris/iris_probe.c
>> +++ b/drivers/media/platform/qcom/iris/iris_probe.c
>> @@ -136,7 +136,7 @@ static int iris_init_non_pixel_node(struct iris_core *core)
>>          struct device_node *np_node;
>>          int ret;
>>
>> -       np_node = of_get_child_by_name(core->dev->of_node, "non_pixel");
>> +       np_node = of_get_child_by_name(core->dev->of_node, "non-pixel");
>>          if (!np_node)
>>                  return 0;
>>
>> ============><========================================
>>
>> It boots again and I can run some decodes on 8550 and 8650.
> Nice. Thank you for your efforts in trying out the patches. Would that be ok
> with you if i can put the tested-by tags in next revision with the amendments ?

Sure please add:

Tested-by: Neil Armstrong <neil.armstrong@...aro.org>

with those changes

Neil

> 
> Regards,
> Vikash
>>
>> Thanks,
>> Neil
>>
>>>
>>> Regards,
>>> Vikash
>>>
>>> [1]
>>> https://git.codelinaro.org/neil.armstrong/linux/-/commit/e1b3628469c038559a60d310386f006f353e3d59#note_23930047
>>>
>>>>
>>>> Neil
>>