linux-kernel - Re: [PATCH 1/2] clk: qcom: videocc: Use HW_CTRL

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Message-ID: <rtmrsvtfukekss4cccnuxgzsm53er5mvgsfshx7xvdwn5vsio2@hgiowygrsmgd>
Date: Mon, 25 Nov 2024 18:27:34 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: "Renjiang Han (QUIC)" <quic_renjiang@...cinc.com>
Cc: "bryan.odonoghue@...aro.org" <bryan.odonoghue@...aro.org>, 
	"Taniya Das (QUIC)" <quic_tdas@...cinc.com>, Bjorn Andersson <andersson@...nel.org>, 
	Michael Turquette <mturquette@...libre.com>, Stephen Boyd <sboyd@...nel.org>, 
	Stanimir Varbanov <stanimir.k.varbanov@...il.com>, "Vikash Garodia (QUIC)" <quic_vgarodia@...cinc.com>, 
	Mauro Carvalho Chehab <mchehab@...nel.org>, "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>, 
	"linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, 
	"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>
Subject: Re: [PATCH 1/2] clk: qcom: videocc: Use HW_CTRL_TRIGGER flag for
 video GDSC's

On Mon, Nov 25, 2024 at 03:14:27PM +0000, Renjiang Han (QUIC) wrote:
> On Monday, November 25, 2024 9:55 PM, Dmitry Baryshkov wrote:
> > On Mon, 25 Nov 2024 at 07:31, Renjiang Han (QUIC) <quic_renjiang@...cinc.com> wrote:
> > > On Saturday, November 23, 2024 8:17 AM, Bryan O'Donoghue wrote:
> > > > On 23/11/2024 00:05, Dmitry Baryshkov wrote:
> > > > > This leaves sm7150, sm8150 and sm8450 untouched. Don't they also 
> > > > > need to use HW_CTRL_TRIGGER?
> > >
> > > > I believe the correct list here is anything that is HFI_VERSION_4XX 
> > > > in
> > >
> > > > You can't apply the second patch in this series without ensuring the 
> > > > clock controllers for sdm845 and sm7180
> > >
> > > > grep HFI_VERSION_4XX drivers/media/platform/qcom/venus/core.c
> > >
> > > > drivers/clk/qcom/videocc-sdm845.c
> > > > drivers/clk/qcom/videocc-sc7180.c
> > >
> > > > Hmm.. that's what this patch does, to be fair my other email was flippant.
> > >
> > > > This is fine in general, once we can get some Tested-by: for it.
> > >
> > > > That's my question - what platforms has this change been tested on ?
> > >
> > > > I can do sdm845 but, we'll need to find someone with 7180 to verify IMO.
> > >
> > > Thanks for your comment. We have run video case with these two patches on sc7180. The result is fine.
> 
> > A single case, a thorough tests, a mixture of suspend&resume while playing video cases?
> 
> > Also, can I please reiterate my question: sm7150, sm8150 and sm8450 ?
> > Should they also be changed to use HW_CTRL_TRIGGER?
> > Next question, sdm660, msm8996, msm8998: do they support HW_CTRL_TRIGGER?
> 
> Thanks for your review. The video playback and recording cases include video
> pause and resume, and full video playback. The results are fine.
> Also, this change is only for v4 core (HFI_VERSION_4XX ). Therefore, we have only tested it
> on platforms using v4 core. We have not tried other platforms.
> sm7150, sm8150 and sm8450 should not use venus v4 core. So they needn't to use HW_CTRL_TRIGGER.

We don't have venus / iris support for those platforms at all.
This patch is not about venus, it is about the clock drivers. So
mentioning venus is quite useless here.
If these platforms will benefit from HW_CTRL_TRIGGER, then we should
change them at the same time, before somebody even gets venus/iris on
them.

-- 
With best wishes
Dmitry