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

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Date:   Sun, 16 Oct 2022 18:22:21 +0200
From:   Martin Kaiser <martin@...ser.cx>
To:     Michael Straube <straube.linux@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        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
Subject: Re: [PATCH 01/10] staging: r8188eu: fix led register settings

Hi Michael,

Thus wrote Michael Straube (straube.linux@...il.com):

> 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

thanks for testing with yet another device! Good to hear that the
settings work there as well.

Best regards,
Martin