linux-kernel - Re: [PATCH v4 00/28] Qualcomm iris video decoder driver

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Message-ID: <ba4620df-7933-3730-eb9a-ffdd5cd98adb@quicinc.com>
Date: Tue, 15 Oct 2024 12:56:34 +0530
From: Dikshita Agarwal <quic_dikshita@...cinc.com>
To: Krzysztof Kozlowski <krzk@...nel.org>,
        Vikash Garodia
	<quic_vgarodia@...cinc.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        "Mauro Carvalho Chehab" <mchehab@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>
CC: Hans Verkuil <hverkuil@...all.nl>,
        Sebastian Fricke
	<sebastian.fricke@...labora.com>,
        <linux-arm-msm@...r.kernel.org>, <linux-media@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Vedang Nagar <quic_vnagar@...cinc.com>
Subject: Re: [PATCH v4 00/28] Qualcomm iris video decoder driver



On 10/14/2024 5:24 PM, Krzysztof Kozlowski wrote:
> On 14/10/2024 11:07, Dikshita Agarwal wrote:
>> Introduce support for Qualcomm new video acceleration hardware i.e.
>> iris, used for video stream decoding.
>>
>> Iris is a multi pipe based hardware that offloads video stream decoding
>> from the application processor (AP). It supports H.264 decoding.
>> The AP communicates with hardware through a well defined protocol,
>> called as host firmware interface (HFI), which provides fine-grained
>> and asynchronous control over individual hardware features.
>>
>> This driver implements upgraded HFI gen2 to communicate with firmware.
>> It supports SM8550 which is based out of HFI gen 2. It also supports
>> SM8250 which is based out of HFI gen1.
>>
>> This driver comes with below capabilities:
>> - V4L2 complaint video driver with M2M and STREAMING capability.
>> - Supports H264 decoder.
>>
>> This driver comes with below features:
>> - Centralized resource management.
>> - Centralized management of core and instance states.
>> - Defines platform specific capabilities and features. As a results, it
>>   provides a single point of control to enable/disable a given feature
>>   depending on specific platform capabilities.
>> - Handles various video recommended sequences, like DRC, Drain, Seek,
>>   EOS.
>> - Implements asynchronous communication with hardware to achieve better
>>   experience in low latency usecases.
>> - Output and capture planes are controlled independently. Thereby
>>   providing a way to reconfigure individual plane.
>> - Native hardware support of LAST flag which is mandatory to align with
>>   port reconfiguration and DRAIN sequence as per V4L guidelines.
>>
>> Changes since v3:
> 
> You send the patches with b4, so why do you strip the link to previous
> series? It makes out life just more difficult. Include the link, how the
> b4 instructs you.
> 
Sure, Noted.

Link to v3 -
https://lore.kernel.org/linux-media/9b116753-9a21-4f9c-b86f-dded20713b53@linaro.org/

Thanks,
Dikshita

> Best regards,
> Krzysztof
>