linux-kernel - Re: [PATCH][next] rtw88: 8723d: fix incorrect setting of ldo

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Date:   Fri, 15 May 2020 00:26:14 +0000
From:   Pkshih <pkshih@...ltek.com>
To:     Tony Chuang <yhchuang@...ltek.com>,
        "colin.king@...onical.com" <colin.king@...onical.com>,
        "kvalo@...eaurora.org" <kvalo@...eaurora.org>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH][next] rtw88: 8723d: fix incorrect setting of ldo_pwr

On Thu, 2020-05-14 at 18:13 +0000, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Currently ldo_pwr has the LDO25 voltage bits set to zero and then
> it is overwritten with the new voltage setting. The assignment
> looks incorrect, it should be bit-wise or'ing in the new voltage
> setting rather than a direct assignment.
> 
> Addresses-Coverity: ("Unused value")
> Fixes: 1afb5eb7a00d ("rtw88: 8723d: Add cfg_ldo25 to control LDO25")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Thank you for your fix.

Acked-by: Ping-Ke Shih <pkshih@...ltek.com>

> ---
>  drivers/net/wireless/realtek/rtw88/rtw8723d.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/wireless/realtek/rtw88/rtw8723d.c
> b/drivers/net/wireless/realtek/rtw88/rtw8723d.c
> index b517af417e0e..2c6e417c5bca 100644
> --- a/drivers/net/wireless/realtek/rtw88/rtw8723d.c
> +++ b/drivers/net/wireless/realtek/rtw88/rtw8723d.c
> @@ -561,7 +561,7 @@ static void rtw8723d_cfg_ldo25(struct rtw_dev *rtwdev,
> bool enable)
>  	ldo_pwr = rtw_read8(rtwdev, REG_LDO_EFUSE_CTRL + 3);
>  	if (enable) {
>  		ldo_pwr &= ~BIT_MASK_LDO25_VOLTAGE;
> -		ldo_pwr = (BIT_LDO25_VOLTAGE_V25 << 4) | BIT_LDO25_EN;
> +		ldo_pwr |= (BIT_LDO25_VOLTAGE_V25 << 4) | BIT_LDO25_EN;
>  	} else {
>  		ldo_pwr &= ~BIT_LDO25_EN;
>  	}
> -- 
> 2.25.1
> 
> 
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