linux-kernel - Re: [PATCH v2 2/2] venus: pm_helpers: Use dev_pm_genpd_set

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Message-ID: <5dexy2uc34b3kv532r45p6oaqn7v6bjohfdpwy42folvsdv6nd@skj7o35dflj2>
Date: Mon, 23 Dec 2024 13:41:32 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Renjiang Han <quic_renjiang@...cinc.com>
Cc: 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 v2 2/2] venus: pm_helpers: Use dev_pm_genpd_set_hwmode to
 switch GDSC mode on V4

On Mon, Dec 23, 2024 at 02:32:42PM +0530, Renjiang Han wrote:
> The POWER_CONTROL register addresses are not constant and can vary across
> the variants. Also as per the HW recommendation, the GDSC mode switching
> needs to be controlled from respective GDSC register and this is a uniform
> approach across all the targets. Hence use dev_pm_genpd_set_hwmode() API
> which controls GDSC mode switching using its respective GDSC register.
> 
> In venus v4 variants, the vcodec gdsc gets enabled in SW mode by default
> with new HW_CTRL_TRIGGER flag and there is no need to switch it to SW mode
> again after enable, hence add check to avoid switching gdsc to SW mode
> again after gdsc enable. Similarly add check to avoid switching GDSC to HW
> mode before disabling the GDSC, so GDSC gets enabled in SW mode in the
> next enable.
> 
> Signed-off-by: Renjiang Han <quic_renjiang@...cinc.com>
> ---
>  drivers/media/platform/qcom/venus/pm_helpers.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/media/platform/qcom/venus/pm_helpers.c b/drivers/media/platform/qcom/venus/pm_helpers.c
> index 33a5a659c0ada0ca97eebb5522c5f349f95c49c7..a2062b366d4aedba3eb5e4be456a005847eaec0b 100644
> --- a/drivers/media/platform/qcom/venus/pm_helpers.c
> +++ b/drivers/media/platform/qcom/venus/pm_helpers.c
> @@ -412,7 +412,7 @@ static int vcodec_control_v4(struct venus_core *core, u32 coreid, bool enable)
>  	u32 val;
>  	int ret;
>  
> -	if (IS_V6(core))
> +	if (IS_V6(core) || IS_V4(core))
>  		return dev_pm_genpd_set_hwmode(core->pmdomains->pd_devs[coreid], !enable);

It is being called only for v4 and v6 targets. Drop the rest of the
function and inline the result. I'd suggest keeping it as two patches
though: this one which adds IS_V4() all over the place and the next one
which performs cleanup of the dead code.

>  	else if (coreid == VIDC_CORE_ID_1) {
>  		ctrl = core->wrapper_base + WRAPPER_VCODEC0_MMCC_POWER_CONTROL;
> @@ -450,7 +450,7 @@ static int poweroff_coreid(struct venus_core *core, unsigned int coreid_mask)
>  
>  		vcodec_clks_disable(core, core->vcodec0_clks);
>  
> -		if (!IS_V6(core)) {
> +		if (!IS_V6(core) && !IS_V4(core)) {
>  			ret = vcodec_control_v4(core, VIDC_CORE_ID_1, false);
>  			if (ret)
>  				return ret;
> @@ -468,7 +468,7 @@ static int poweroff_coreid(struct venus_core *core, unsigned int coreid_mask)
>  
>  		vcodec_clks_disable(core, core->vcodec1_clks);
>  
> -		if (!IS_V6(core)) {
> +		if (!IS_V6(core) && !IS_V4(core)) {
>  			ret = vcodec_control_v4(core, VIDC_CORE_ID_2, false);

The poweron_coreid() and poweroff_coreid() functions are called only for
v4 and v6. The v6 case was masked out earlier. Now you've removed the v4
case too. Can we drop such vcodec_control_v4() calls completely?

>  			if (ret)
>  				return ret;
> @@ -491,7 +491,7 @@ static int poweron_coreid(struct venus_core *core, unsigned int coreid_mask)
>  		if (ret < 0)
>  			return ret;
>  
> -		if (!IS_V6(core)) {
> +		if (!IS_V6(core) && !IS_V4(core)) {
>  			ret = vcodec_control_v4(core, VIDC_CORE_ID_1, true);
>  			if (ret)
>  				return ret;
> @@ -511,7 +511,7 @@ static int poweron_coreid(struct venus_core *core, unsigned int coreid_mask)
>  		if (ret < 0)
>  			return ret;
>  
> -		if (!IS_V6(core)) {
> +		if (!IS_V6(core) && !IS_V4(core)) {
>  			ret = vcodec_control_v4(core, VIDC_CORE_ID_2, true);
>  			if (ret)
>  				return ret;
> 
> -- 
> 2.34.1
> 

-- 
With best wishes
Dmitry