linux-kernel - Re: [PATCH v2 00/34] Qualcomm video encoder and decoder driver

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Message-ID: <e9a3eede-f910-4bd9-afd7-1b6117cf6eff@linaro.org>
Date: Fri, 12 Apr 2024 14:52:57 +0100
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Hyunjun Ko <zzoon@...lia.com>, quic_dikshita@...cinc.com
Cc: agross@...nel.org, andersson@...nel.org, konrad.dybcio@...aro.org,
 linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-media@...r.kernel.org, mchehab@...nel.org, quic_abhinavk@...cinc.com,
 quic_vgarodia@...cinc.com, stanimir.k.varbanov@...il.com
Subject: Re: [PATCH v2 00/34] Qualcomm video encoder and decoder driver

On 12/04/2024 08:13, Hyunjun Ko wrote:
> Hi,
> 
> I'm trying this series of patches for enabling /dev/video0 on sm8650 hdk but failed.
> After modprobing, lsmod says just like the follwoing:
> 
> root@...8650:/lib/modules/6.7.0-rc3+# lsmod
> Module                  Size  Used by
> iris                  110592  -2
> v4l2_mem2mem           20480  -2
> videobuf2_memops       12288  -2
> videobuf2_v4l2         20480  -2
> videobuf2_common       45056  -2
> videodev              176128  -2
> 
> 
> This series looks for sm8550 device though, my question is that this series have been tested on the device (sm8650 hdk)? or do you expect this should work on it?
> 

Different SoCs so despite how close they look in version numbers, you'd 
expect at a minimum some clock and/or power-domain churn - even if there 
is a 1:1 mapping in register numbers and offsets.

We wouldn't ordinarily expect to be able to be able to move SoC versions 
so easily - 8550 and 8650 have similar SoC version numbers but, this is 
not necessarily an indicator of silicon IP block version reuse.

---
bod