Re: [PATCH 2/2] media: iris: Enable Gen2 HFI on SC7280

[Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>]

On 2/12/26 12:16 PM, Dikshita Agarwal wrote:
> 
> 
> On 2/9/2026 6:05 PM, Dmitry Baryshkov wrote:
>> On Mon, Feb 09, 2026 at 05:04:48PM +0530, Dikshita Agarwal wrote:
>>>
>>>
>>> On 2/9/2026 3:32 PM, Konrad Dybcio wrote:
>>>> On 2/9/26 10:45 AM, Dikshita Agarwal wrote:
>>>>> SC7280 supports both Gen1 and Gen2 HFI firmware. The driver continues to
>>>>> use Gen1 by default, but boards that intend to use Gen2 firmware can
>>>>> opt‑in by specifying a Gen2 image through the Device Tree
>>>>> 'firmware-name' property.
>>>>>
>>>>> Based on this property and the availability of the referenced
>>>>> firmware binary, the driver selects the appropriate HFI generation and
>>>>> updates its platform data accordingly. Boards that do not
>>>>> specify a Gen2 firmware, or where the firmware is not present,
>>>>> automatically fall back to Gen1.
>>>>>
>>>>> Signed-off-by: Dikshita Agarwal <dikshita.agarwal@oss.qualcomm.com>
>>>>> ---

[...]

>>> To avoid accidental matches, I can switch to an exact filename match
>>> instead. That way, only the specific Gen2 image (for example
>>> "qcom/vpu/vpu20_p1_gen2.mbn") will trigger the Gen2 path, and boards that
>>
>> How do you detect that for the OEM-signed firmware, which can have
>> random name?
>>
>>> want to use Gen2 can opt in by naming the firmware accordingly.
> 
> I Explored on suggested alternative approaches and seeing some limitation
> with the both of them:
> 
> 1. Detecting Gen1/Gen2 by scanning the firmware blob (fw->data)
> It is possible to parse QC_IMAGE_VERSION_STRING from the .mbn and  extract
> the version string. The issues with this approach :
> 
> - the version string has no explicit marker that identifies Gen1 vs Gen2.
> 
> - This prefix is not a formal ABI, and it is not consistent across SoCs.
> Each SoC family uses different naming patterns in the version string.
> 
> Example : For SC7280 Gen1 we currently see:
> QC_IMAGE_VERSION_STRING=video-firmware.1.0-<hash> while SM8250 has
> QC_IMAGE_VERSION_STRING=VIDEO.VPU.1.0-00119-<>
> 
> So the driver would need SoC‑specific string‑matching rules, which is hard
> to maintain if we are looking for a design to address all available SOCs.

The only SoC with such distinction today is kodiak. So we can simply check:

if (kodiak && strstr(fw->data, "VIDEO.VPU.1.0.")
	hfi = gen2;


Can we agree that VIDEO.VPU.x firmwares are hfigen2? If so, problem also
solved for <=8450

Konrad