linux-kernel - Re: [PATCH v8 11/26] PM / devfreq: rockchip-dfi: Handle LPDDR2 correctly

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Message-ID: <dd51feee-a44c-4d56-808f-6a26d69f2eb9@kernel.org>
Date:   Thu, 19 Oct 2023 00:06:43 +0900
From:   Chanwoo Choi <chanwoo@...nel.org>
To:     Sascha Hauer <s.hauer@...gutronix.de>,
        linux-rockchip@...ts.infradead.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, Heiko Stuebner <heiko@...ech.de>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>, kernel@...gutronix.de,
        Michael Riesch <michael.riesch@...fvision.net>,
        Robin Murphy <robin.murphy@....com>,
        Vincent Legoll <vincent.legoll@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, devicetree@...r.kernel.org,
        Sebastian Reichel <sebastian.reichel@...labora.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Chanwoo Choi <cw00.choi@...sung.com>
Subject: Re: [PATCH v8 11/26] PM / devfreq: rockchip-dfi: Handle LPDDR2
 correctly

On 23. 10. 18. 15:16, Sascha Hauer wrote:
> According to the downstream driver the DDRMON_CTRL_LPDDR23 bit must be
> set for both LPDDR2 and LPDDR3. Add the missing LPDDR2 case and while
> at it turn the if/else if/else into switch/case which makes it easier
> to read.
> 
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Reviewed-by: Sebastian Reichel <sebastian.reichel@...labora.com>
> Acked-by: Chanwoo Choi <cw00.choi@...sung.com>
> Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
> ---
>  drivers/devfreq/event/rockchip-dfi.c | 11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/devfreq/event/rockchip-dfi.c b/drivers/devfreq/event/rockchip-dfi.c
> index 571d72d1abd1c..8ce0191552ef1 100644
> --- a/drivers/devfreq/event/rockchip-dfi.c
> +++ b/drivers/devfreq/event/rockchip-dfi.c
> @@ -83,12 +83,19 @@ static void rockchip_dfi_start_hardware_counter(struct devfreq_event_dev *edev)
>  		       DDRMON_CTRL_HARDWARE_EN), dfi_regs + DDRMON_CTRL);
>  
>  	/* set ddr type to dfi */
> -	if (dfi->ddr_type == ROCKCHIP_DDRTYPE_LPDDR3)
> +	switch (dfi->ddr_type) {
> +	case ROCKCHIP_DDRTYPE_LPDDR2:
> +	case ROCKCHIP_DDRTYPE_LPDDR3:
>  		writel_relaxed(HIWORD_UPDATE(DDRMON_CTRL_LPDDR23, DDRMON_CTRL_DDR_TYPE_MASK),
>  			       dfi_regs + DDRMON_CTRL);
> -	else if (dfi->ddr_type == ROCKCHIP_DDRTYPE_LPDDR4)
> +		break;
> +	case ROCKCHIP_DDRTYPE_LPDDR4:
>  		writel_relaxed(HIWORD_UPDATE(DDRMON_CTRL_LPDDR4, DDRMON_CTRL_DDR_TYPE_MASK),
>  			       dfi_regs + DDRMON_CTRL);
> +		break;
> +	default:
> +		break;
> +	}
>  
>  	/* enable count, use software mode */
>  	writel_relaxed(HIWORD_UPDATE(DDRMON_CTRL_SOFTWARE_EN, DDRMON_CTRL_SOFTWARE_EN),

Acked-by: Chanwoo Choi <cw00.choi@...sung.com>

-- 
Best Regards,
Samsung Electronics
Chanwoo Choi