RE: [PATCH] wifi: rtl8xxxu: fix LED control code of RTL8192FU

[Ping-Ke Shih]

> -----Original Message-----
> From: Zenm Chen <zenmchen@xxxxxxxxx>
> Sent: Sunday, September 10, 2023 8:21 AM
> To: Jes.Sorensen@xxxxxxxxx
> Cc: kvalo@xxxxxxxxxx; linux-wireless@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> rtl8821cerfe2@xxxxxxxxx; Ping-Ke Shih <pkshih@xxxxxxxxxxx>; Zenm Chen <zenmchen@xxxxxxxxx>
> Subject: [PATCH] wifi: rtl8xxxu: fix LED control code of RTL8192FU
> 
> ASUS USB-N13 C1 is a wifi adapter based on a RTL8192FU chip and its LED
> doesn't blink with the rtl8xxxu driver. This patch fix this via writing
> the correct value to the register "REG_LEDCFG0".
> 
> This was tested with these two wifi adapters:
> ASUS USB-N13 C1 (vid=0x0b05, pid=0x18f1, rfe_type=0x1)
> MERCURY MW310UH (vid=0x0bda, pid=0xf192, rfe_type=0x5)

Did you ever try Linux vendor driver for software and hardware LED? 
Seemingly, the vendor driver is different from yours, but I'm pretty 
sure which one is correct because I don't have a RTL8192FU stick. 

> 
> Signed-off-by: Zenm Chen <zenmchen@xxxxxxxxx>
> ---
>  .../realtek/rtl8xxxu/rtl8xxxu_8192f.c         | 24 ++++++++-----------
>  1 file changed, 10 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192f.c
> b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192f.c
> index 28e93835e05a..ab6d4e4e228e 100644
> --- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192f.c
> +++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192f.c
> @@ -2014,26 +2014,22 @@ static int rtl8192fu_led_brightness_set(struct led_classdev *led_cdev,
>         struct rtl8xxxu_priv *priv = container_of(led_cdev,
>                                                   struct rtl8xxxu_priv,
>                                                   led_cdev);
> -       u16 ledcfg;
> +       u32 ledcfg;
> 
>         /* Values obtained by observing the USB traffic from the Windows driver. */
>         rtl8xxxu_write32(priv, REG_SW_GPIO_SHARE_CTRL_0, 0x20080);
>         rtl8xxxu_write32(priv, REG_SW_GPIO_SHARE_CTRL_1, 0x1b0000);
> 
> -       ledcfg = rtl8xxxu_read16(priv, REG_LEDCFG0);
> -
> -       if (brightness == LED_OFF) {
> -               /* Value obtained like above. */
> -               ledcfg = BIT(1) | BIT(7);
> -       } else if (brightness == LED_ON) {
> -               /* Value obtained like above. */
> -               ledcfg = BIT(1) | BIT(7) | BIT(11);
> -       } else if (brightness == RTL8XXXU_HW_LED_CONTROL) {
> -               /* Value obtained by brute force. */
> -               ledcfg = BIT(8) | BIT(9);
> -       }

The definitions are used by this driver: 

#define BIT_LED2EN BIT(21)
#define BIT_LED1SV BIT(11) // the same definition with BIT_LED0SV
#define BIT_LED1CM GENMASK(10, 8) // use the same value of BIT_LED0CM
#define BIT_LED0SV BIT(3)
#define BIT_LED0CM GENMASK(2, 0)
#define LED_MODE_TX_OR_RX_EVENTS 3
#define LED_MODE_SW_CTRL 0


> +       /* Enable LED0 GPIO and turn LED0/LED1 off. */
> +       ledcfg = (rtl8xxxu_read32(priv, REG_LEDCFG0) | BIT(21)) & ~0xffff;

Split this statement into multiple lines and use definitions I provide above.

> +
> +       /* Values obtained by brute force. */
> +       if (brightness == LED_ON)
> +               ledcfg |= BIT(3) | BIT(11);
> +       else if (brightness == RTL8XXXU_HW_LED_CONTROL)
> +               ledcfg |= BIT(0) | BIT(1) | BIT(8) | BIT(9);
> 
> -       rtl8xxxu_write16(priv, REG_LEDCFG0, ledcfg);
> +       rtl8xxxu_write32(priv, REG_LEDCFG0, ledcfg);
> 
>         return 0;
>  }
> --
> 2.42.0