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

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Message-ID: <23ho25gl3iwyi2jspb6a2x5bv76fco5pkg2x5ct4gu3c44dbiq@yec6evx5sihm>
Date: Sat, 23 Nov 2024 02:05:24 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Taniya Das <quic_tdas@...cinc.com>
Cc: Renjiang Han <quic_renjiang@...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_vgarodia@...cinc.com>, Bryan O'Donoghue <bryan.odonoghue@...aro.org>, 
	Mauro Carvalho Chehab <mchehab@...nel.org>, linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org, 
	linux-kernel@...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 Fri, Nov 22, 2024 at 10:25:44PM +0530, Taniya Das wrote:
> 
> 
> On 11/22/2024 4:29 PM, Dmitry Baryshkov wrote:
> > On Fri, Nov 22, 2024 at 04:01:45PM +0530, Renjiang Han wrote:
> > > From: Taniya Das <quic_tdas@...cinc.com>
> > > 
> > > The video driver will be using the newly introduced
> > 
> > 'will be' or 'is using'? Or will be using it for these platforms? Is
> > there any kind of dependency between two patches in the series?
> > 
> The video driver will not be able to work without the clock side changes.

Will enabling this flag break the video driver until it is updated?

> 
> > > dev_pm_genpd_set_hwmode() API to switch the video GDSC to HW and SW
> > > control modes at runtime.
> > > Hence use HW_CTRL_TRIGGER flag instead of HW_CTRL for video GDSC's for
> > > Qualcomm SoC SC7180 and SDM845.
> > 
> > Is it applicable to any other platforms? Why did you select just these
> > two?
> > 
> 
> The V6 version of Video driver is already using them, now the video driver
> wants to migrate to v4 version of the HW to use the new flag.

I mean slightly different issue. We have following drivers:

videocc-sa8775p.c - already uses HW_CTRL_TRIGGER
videocc-sc7180.c - being converted now
videocc-sc7280.c - already uses HW_CTRL_TRIGGER
videocc-sdm845.c - being converted now
videocc-sm7150.c
videocc-sm8150.c
videocc-sm8250.c - already uses HW_CTRL_TRIGGER
videocc-sm8350.c - already uses HW_CTRL_TRIGGER
videocc-sm8450.c
videocc-sm8550.c - already uses HW_CTRL_TRIGGER

This leaves sm7150, sm8150 and sm8450 untouched. Don't they also need to
use HW_CTRL_TRIGGER?

> 
> > > 
> > > Signed-off-by: Taniya Das <quic_tdas@...cinc.com>
> > > Signed-off-by: Renjiang Han <quic_renjiang@...cinc.com>
> > > ---
> > >   drivers/clk/qcom/videocc-sc7180.c | 2 +-
> > >   drivers/clk/qcom/videocc-sdm845.c | 4 ++--
> > >   2 files changed, 3 insertions(+), 3 deletions(-)
> > > 
> > > diff --git a/drivers/clk/qcom/videocc-sc7180.c b/drivers/clk/qcom/videocc-sc7180.c
> > > index d7f84548039699ce6fdd7c0f6675c168d5eaf4c1..dd2441d6aa83bd7cff17deeb42f5d011c1e9b134 100644
> > > --- a/drivers/clk/qcom/videocc-sc7180.c
> > > +++ b/drivers/clk/qcom/videocc-sc7180.c
> > > @@ -166,7 +166,7 @@ static struct gdsc vcodec0_gdsc = {
> > >   	.pd = {
> > >   		.name = "vcodec0_gdsc",
> > >   	},
> > > -	.flags = HW_CTRL,
> > > +	.flags = HW_CTRL_TRIGGER,
> > >   	.pwrsts = PWRSTS_OFF_ON,
> > >   };
> > > diff --git a/drivers/clk/qcom/videocc-sdm845.c b/drivers/clk/qcom/videocc-sdm845.c
> > > index f77a0777947773dc8902c92098acff71b9b8f10f..6dedc80a8b3e18eca82c08a5bcd7e1fdc374d4b5 100644
> > > --- a/drivers/clk/qcom/videocc-sdm845.c
> > > +++ b/drivers/clk/qcom/videocc-sdm845.c
> > > @@ -260,7 +260,7 @@ static struct gdsc vcodec0_gdsc = {
> > >   	},
> > >   	.cxcs = (unsigned int []){ 0x890, 0x930 },
> > >   	.cxc_count = 2,
> > > -	.flags = HW_CTRL | POLL_CFG_GDSCR,
> > > +	.flags = HW_CTRL_TRIGGER | POLL_CFG_GDSCR,
> > >   	.pwrsts = PWRSTS_OFF_ON,
> > >   };
> > > @@ -271,7 +271,7 @@ static struct gdsc vcodec1_gdsc = {
> > >   	},
> > >   	.cxcs = (unsigned int []){ 0x8d0, 0x950 },
> > >   	.cxc_count = 2,
> > > -	.flags = HW_CTRL | POLL_CFG_GDSCR,
> > > +	.flags = HW_CTRL_TRIGGER | POLL_CFG_GDSCR,
> > >   	.pwrsts = PWRSTS_OFF_ON,
> > >   };
> > > 
> > > -- 
> > > 2.34.1
> > > 
> > 
> 
> -- 
> Thanks & Regards,
> Taniya Das.

-- 
With best wishes
Dmitry