linux-kernel - Re: [PATCH 01/10] staging: r8188eu: fix led register settings

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Message-ID: <c8c03bd1-9fa4-fc79-d4fe-727753e1df2c@gmail.com>
Date:   Sun, 16 Oct 2022 11:13:22 +0200
From:   Michael Straube <straube.linux@...il.com>
To:     Martin Kaiser <martin@...ser.cx>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Larry Finger <Larry.Finger@...inger.net>,
        Phillip Potter <phil@...lpotter.co.uk>,
        Pavel Skripkin <paskripkin@...il.com>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, straube.linux@...il.com
Subject: Re: [PATCH 01/10] staging: r8188eu: fix led register settings

On 10/15/22 17:11, Martin Kaiser wrote:
> Using an InterTech DMG-02 dongle, the led remains on when the system goes
> into standby mode. After wakeup, it's no longer possible to control the
> led.
> 
> It turned out that the register settings to enable or disable the led were
> not correct. They worked for some dongles like the Edimax V2 but not for
> others like the InterTech DMG-02.
> 
> This patch fixes the register settings. Bit 3 in the led_cfg2 register
> controls the led status, bit 5 must always be set to be able to control
> the led, bit 6 has no influence on the led. Setting the mac_pinmux_cfg
> register is not necessary.
> 
> These settings were tested with Edimax V2 and InterTech DMG-02.
> 
> Cc: stable@...r.kernel.org
> Fixes: 8cd574e6af54 ("staging: r8188eu: introduce new hal dir for RTL8188eu driver")
> Suggested-by: Michael Straube <straube.linux@...il.com>
> Signed-off-by: Martin Kaiser <martin@...ser.cx>
> ---
>   drivers/staging/r8188eu/core/rtw_led.c | 25 ++-----------------------
>   1 file changed, 2 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/staging/r8188eu/core/rtw_led.c b/drivers/staging/r8188eu/core/rtw_led.c
> index 2527c252c3e9..5b214488571b 100644
> --- a/drivers/staging/r8188eu/core/rtw_led.c
> +++ b/drivers/staging/r8188eu/core/rtw_led.c
> @@ -31,40 +31,19 @@ static void ResetLedStatus(struct led_priv *pLed)
>   
>   static void SwLedOn(struct adapter *padapter, struct led_priv *pLed)
>   {
> -	u8	LedCfg;
> -	int res;
> -
>   	if (padapter->bDriverStopped)
>   		return;
>   
> -	res = rtw_read8(padapter, REG_LEDCFG2, &LedCfg);
> -	if (res)
> -		return;
> -
> -	rtw_write8(padapter, REG_LEDCFG2, (LedCfg & 0xf0) | BIT(5) | BIT(6)); /*  SW control led0 on. */
> +	rtw_write8(padapter, REG_LEDCFG2, BIT(5)); /*  SW control led0 on. */
>   	pLed->bLedOn = true;
>   }
>   
>   static void SwLedOff(struct adapter *padapter, struct led_priv *pLed)
>   {
> -	u8	LedCfg;
> -	int res;
> -
>   	if (padapter->bDriverStopped)
>   		goto exit;
>   
> -	res = rtw_read8(padapter, REG_LEDCFG2, &LedCfg);/* 0x4E */
> -	if (res)
> -		goto exit;
> -
> -	LedCfg &= 0x90; /*  Set to software control. */
> -	rtw_write8(padapter, REG_LEDCFG2, (LedCfg | BIT(3)));
> -	res = rtw_read8(padapter, REG_MAC_PINMUX_CFG, &LedCfg);
> -	if (res)
> -		goto exit;
> -
> -	LedCfg &= 0xFE;
> -	rtw_write8(padapter, REG_MAC_PINMUX_CFG, LedCfg);
> +	rtw_write8(padapter, REG_LEDCFG2, BIT(5) | BIT(3));
>   exit:
>   	pLed->bLedOn = false;
>   }

I tested this also with a TP-Link TL-WN725N now and it works fine.

Tested-by: Michael Straube <straube.linux@...il.com> # InterTech DMG-02, 
TP-Link TL-WN725N