linux-kernel - Re: [PATCH v3 4/6] drm/msm/dsi: Use the new regulator bulk feature to specify the load

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Date:   Wed, 3 Aug 2022 10:12:07 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Douglas Anderson <dianders@...omium.org>,
        Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>
Cc:     dri-devel@...ts.freedesktop.org, Mark Brown <broonie@...nel.org>,
        linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Jonathan Marek <jonathan@...ek.ca>,
        Rajeev Nandan <quic_rajeevny@...cinc.com>,
        Sean Paul <sean@...rly.run>,
        Stephen Boyd <swboyd@...omium.org>,
        Vinod Koul <vkoul@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 4/6] drm/msm/dsi: Use the new regulator bulk feature to
 specify the load

On 03/08/2022 01:37, Douglas Anderson wrote:
> As of commit 6eabfc018e8d ("regulator: core: Allow specifying an
> initial load w/ the bulk API") we can now specify the initial load in
> the bulk data rather than having to manually call regulator_set_load()
> on each regulator. Let's use it.
> 
> Signed-off-by: Douglas Anderson <dianders@...omium.org>

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

It might have been better, if the previous patch had only removed the 
load_setting on disable and inlined the dsi_host_regulator_disable(). 
Then this patch would drop the regulator_set_load() from 
dsi_host_regulator_enable() path and inline it. Then it would have been 
more obvious that after these two changes the time when we set loads is 
not changed.

> ---
> 
> Changes in v3:
> - Update commit message to point at the git hash of the regulator change.
> 
> Changes in v2:
> - ("Use the new regulator bulk feature to specify the load") new for v2.
> 
>   drivers/gpu/drm/msm/dsi/dsi_host.c    | 13 +++----------
>   drivers/gpu/drm/msm/dsi/phy/dsi_phy.c | 13 +++----------
>   2 files changed, 6 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
> index 9df278d39559..a0a1b6d61d05 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
> @@ -260,8 +260,10 @@ static int dsi_regulator_init(struct msm_dsi_host *msm_host)
>   	int num = msm_host->cfg_hnd->cfg->reg_cfg.num;
>   	int i, ret;
>   
> -	for (i = 0; i < num; i++)
> +	for (i = 0; i < num; i++) {
>   		s[i].supply = regs[i].name;
> +		s[i].init_load_uA = regs[i].enable_load;
> +	}
>   
>   	ret = devm_regulator_bulk_get(&msm_host->pdev->dev, num, s);
>   	if (ret < 0) {
> @@ -270,15 +272,6 @@ static int dsi_regulator_init(struct msm_dsi_host *msm_host)
>   		return ret;
>   	}
>   
> -	for (i = 0; i < num; i++) {
> -		if (regs[i].enable_load >= 0) {
> -			ret = regulator_set_load(s[i].consumer,
> -						 regs[i].enable_load);
> -			if (ret < 0)
> -				return ret;
> -		}
> -	}
> -
>   	return 0;
>   }
>   
> diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
> index 7c105120d73e..efb6b1726cdb 100644
> --- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
> +++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
> @@ -515,8 +515,10 @@ static int dsi_phy_regulator_init(struct msm_dsi_phy *phy)
>   	int num = phy->cfg->reg_cfg.num;
>   	int i, ret;
>   
> -	for (i = 0; i < num; i++)
> +	for (i = 0; i < num; i++) {
>   		s[i].supply = regs[i].name;
> +		s[i].init_load_uA = regs[i].enable_load;
> +	}
>   
>   	ret = devm_regulator_bulk_get(dev, num, s);
>   	if (ret < 0) {
> @@ -529,15 +531,6 @@ static int dsi_phy_regulator_init(struct msm_dsi_phy *phy)
>   		return ret;
>   	}
>   
> -	for (i = 0; i < num; i++) {
> -		if (regs[i].enable_load >= 0) {
> -			ret = regulator_set_load(s[i].consumer,
> -							regs[i].enable_load);
> -			if (ret < 0)
> -				return ret;
> -		}
> -	}
> -
>   	return 0;
>   }
>   


-- 
With best wishes
Dmitry