linux-kernel - Re: [PATCH v4 13/14] soc: mediatek: mtk-svs: use common function to disable restore voltages

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Date:   Tue, 31 Jan 2023 14:40:20 +0100
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Roger Lu <roger.lu@...iatek.com>,
        Enric Balletbo Serra <eballetbo@...il.com>,
        Kevin Hilman <khilman@...nel.org>,
        Nicolas Boichat <drinkcat@...gle.com>
Cc:     Fan Chen <fan.chen@...iatek.com>,
        Jia-wei Chang <jia-wei.chang@...iatek.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v4 13/14] soc: mediatek: mtk-svs: use common function to
 disable restore voltages



On 11/01/2023 08:45, Roger Lu wrote:
> The timing of disabling SVS bank and restore default voltage is more
> than one place. Therefore, add a common function to use for removing
> the superfluous codes.
> 
> Signed-off-by: Roger Lu <roger.lu@...iatek.com>
> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Same here, change looks good. Could you please rebase and resend:

Reviewed-by: Matthias Brugger <matthias.bgg@...il.com>

> ---
>   drivers/soc/mediatek/mtk-svs.c | 54 ++++++++++++++--------------------
>   1 file changed, 22 insertions(+), 32 deletions(-)
> 
> diff --git a/drivers/soc/mediatek/mtk-svs.c b/drivers/soc/mediatek/mtk-svs.c
> index a7f0a6f02d52..89117807e85d 100644
> --- a/drivers/soc/mediatek/mtk-svs.c
> +++ b/drivers/soc/mediatek/mtk-svs.c
> @@ -648,6 +648,25 @@ static int svs_adjust_pm_opp_volts(struct svs_bank *svsb)
>   	return ret;
>   }
>   
> +static void svs_bank_disable_and_restore_default_volts(struct svs_platform *svsp,
> +						       struct svs_bank *svsb)
> +{
> +	unsigned long flags;
> +
> +	if (svsb->mode_support == SVSB_MODE_ALL_DISABLE)
> +		return;
> +
> +	spin_lock_irqsave(&svs_lock, flags);
> +	svsp->pbank = svsb;
> +	svs_switch_bank(svsp);
> +	svs_writel_relaxed(svsp, SVSB_PTPEN_OFF, SVSEN);
> +	svs_writel_relaxed(svsp, SVSB_INTSTS_VAL_CLEAN, INTSTS);
> +	spin_unlock_irqrestore(&svs_lock, flags);
> +
> +	svsb->phase = SVSB_PHASE_ERROR;
> +	svs_adjust_pm_opp_volts(svsb);
> +}
> +
>   #ifdef CONFIG_DEBUG_FS
>   static int svs_dump_debug_show(struct seq_file *m, void *p)
>   {
> @@ -724,7 +743,6 @@ static ssize_t svs_enable_debug_write(struct file *filp,
>   {
>   	struct svs_bank *svsb = file_inode(filp)->i_private;
>   	struct svs_platform *svsp = dev_get_drvdata(svsb->dev);
> -	unsigned long flags;
>   	int enabled, ret;
>   	char *buf = NULL;
>   
> @@ -740,16 +758,8 @@ static ssize_t svs_enable_debug_write(struct file *filp,
>   		return ret;
>   
>   	if (!enabled) {
> -		spin_lock_irqsave(&svs_lock, flags);
> -		svsp->pbank = svsb;
> +		svs_bank_disable_and_restore_default_volts(svsp, svsb);
>   		svsb->mode_support = SVSB_MODE_ALL_DISABLE;
> -		svs_switch_bank(svsp);
> -		svs_writel_relaxed(svsp, SVSB_PTPEN_OFF, SVSEN);
> -		svs_writel_relaxed(svsp, SVSB_INTSTS_VAL_CLEAN, INTSTS);
> -		spin_unlock_irqrestore(&svs_lock, flags);
> -
> -		svsb->phase = SVSB_PHASE_ERROR;
> -		svs_adjust_pm_opp_volts(svsb);
>   	}
>   
>   	kfree(buf);
> @@ -1532,16 +1542,7 @@ static int svs_init02(struct svs_platform *svsp)
>   out_of_init02:
>   	for (idx = 0; idx < svsp->bank_max; idx++) {
>   		svsb = &svsp->banks[idx];
> -
> -		spin_lock_irqsave(&svs_lock, flags);
> -		svsp->pbank = svsb;
> -		svs_switch_bank(svsp);
> -		svs_writel_relaxed(svsp, SVSB_PTPEN_OFF, SVSEN);
> -		svs_writel_relaxed(svsp, SVSB_INTSTS_VAL_CLEAN, INTSTS);
> -		spin_unlock_irqrestore(&svs_lock, flags);
> -
> -		svsb->phase = SVSB_PHASE_ERROR;
> -		svs_adjust_pm_opp_volts(svsb);
> +		svs_bank_disable_and_restore_default_volts(svsp, svsb);
>   	}
>   
>   	return ret;
> @@ -1587,7 +1588,6 @@ static int svs_suspend(struct device *dev)
>   {
>   	struct svs_platform *svsp = dev_get_drvdata(dev);
>   	struct svs_bank *svsb;
> -	unsigned long flags;
>   	int ret;
>   	u32 idx;
>   
> @@ -1599,17 +1599,7 @@ static int svs_suspend(struct device *dev)
>   
>   	for (idx = 0; idx < svsp->bank_max; idx++) {
>   		svsb = &svsp->banks[idx];
> -
> -		/* This might wait for svs_isr() process */
> -		spin_lock_irqsave(&svs_lock, flags);
> -		svsp->pbank = svsb;
> -		svs_switch_bank(svsp);
> -		svs_writel_relaxed(svsp, SVSB_PTPEN_OFF, SVSEN);
> -		svs_writel_relaxed(svsp, SVSB_INTSTS_VAL_CLEAN, INTSTS);
> -		spin_unlock_irqrestore(&svs_lock, flags);
> -
> -		svsb->phase = SVSB_PHASE_ERROR;
> -		svs_adjust_pm_opp_volts(svsb);
> +		svs_bank_disable_and_restore_default_volts(svsp, svsb);
>   	}
>   
>   	ret = reset_control_assert(svsp->rst);