Re: [PATCH 13/19] wifi: rtw88: sdio: set up RX aggregation and interrupts for RTL8723BS

[Bitterblue Smith <rtl8821cerfe2@gmail.com>]

On 24/07/2026 21:32, luka.gejak@linux.dev wrote:
> From: Luka Gejak <luka.gejak@linux.dev>
> 
> Enable the existing RX aggregation setup for this chip and select the
> larger DMA aggregation mode it needs. The RTL8723BS does not raise
> CPWM1, so leave that source out of its interrupt mask, and set the SDIO
> TX control bit the vendor driver uses to have transfers always
> recognised.
> 
> Interrupt status is also acknowledged differently: write back only the
> bits that are actually defined, and for this chip only those that are
> unmasked, rather than writing the raw status word back. Writing back
> undefined bits leaves the RTL8723BS raising a persistent interrupt after
> resume. Note that restricting the acknowledgment to defined bits
> applies to the other SDIO parts as well.

Why does it apply to the others?

> 
> Signed-off-by: Luka Gejak <luka.gejak@linux.dev>
> ---
>  drivers/net/wireless/realtek/rtw88/sdio.c | 29 +++++++++++++++++++++--
>  drivers/net/wireless/realtek/rtw88/sdio.h |  9 +++++++
>  2 files changed, 36 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/wireless/realtek/rtw88/sdio.c b/drivers/net/wireless/realtek/rtw88/sdio.c
> index fcbb0ee601c1..1c2d8082f468 100644
> --- a/drivers/net/wireless/realtek/rtw88/sdio.c
> +++ b/drivers/net/wireless/realtek/rtw88/sdio.c
> @@ -866,7 +866,11 @@ static void rtw_sdio_init(struct rtw_dev *rtwdev)
>  {
>  	struct rtw_sdio *rtwsdio = (struct rtw_sdio *)rtwdev->priv;
>  
> -	rtwsdio->irq_mask = REG_SDIO_HIMR_RX_REQUEST | REG_SDIO_HIMR_CPWM1;
> +	if (rtw_is_8723bs(rtwdev))
> +		rtwsdio->irq_mask = REG_SDIO_HIMR_RX_REQUEST;
> +	else
> +		rtwsdio->irq_mask = REG_SDIO_HIMR_RX_REQUEST |
> +				       REG_SDIO_HIMR_CPWM1;
>  }
>  
>  static void rtw_sdio_enable_rx_aggregation(struct rtw_dev *rtwdev)
> @@ -874,6 +878,7 @@ static void rtw_sdio_enable_rx_aggregation(struct rtw_dev *rtwdev)
>  	u8 size, timeout;
>  
>  	switch (rtwdev->chip->id) {
> +	case RTW_CHIP_TYPE_8723B:
>  	case RTW_CHIP_TYPE_8703B:
>  	case RTW_CHIP_TYPE_8821A:
>  	case RTW_CHIP_TYPE_8812A:
> @@ -901,6 +906,8 @@ static void rtw_sdio_enable_rx_aggregation(struct rtw_dev *rtwdev)
>  		    FIELD_PREP(BIT_DMA_AGG_TO_V1, timeout));
>  
>  	rtw_write8_set(rtwdev, REG_RXDMA_MODE, BIT_DMA_MODE);
> +	if (rtw_is_8723bs(rtwdev))
> +		rtw_write8_set(rtwdev, REG_RXDMA_MODE, 3 << 2);
>  }
>  
>  static void rtw_sdio_enable_interrupt(struct rtw_dev *rtwdev)
> @@ -969,9 +976,19 @@ static void rtw_sdio_8723bs_check_rqpn(struct rtw_dev *rtwdev)
>  
>  static int rtw_sdio_start(struct rtw_dev *rtwdev)
>  {
> +	u32 clear;
> +
>  	rtw_sdio_8723bs_check_rqpn(rtwdev);
>  	rtw_sdio_init_free_txpg(rtwdev);
>  	rtw_sdio_enable_rx_aggregation(rtwdev);
> +
> +	if (rtw_is_8723bs(rtwdev)) {
> +		clear = rtw_read32(rtwdev, REG_SDIO_HISR) &
> +			RTW_SDIO_HISR_CLEAR_MASK;
> +		if (clear)
> +			rtw_write32(rtwdev, REG_SDIO_HISR, clear);
> +	}
> +
>  	rtw_sdio_enable_interrupt(rtwdev);
>  
>  	return 0;
> @@ -1051,6 +1068,8 @@ static void rtw_sdio_interface_cfg(struct rtw_dev *rtwdev)
>  
>  	val = rtw_read32(rtwdev, REG_SDIO_TX_CTRL);
>  	val &= 0xfff8;
> +	if (rtw_is_8723bs(rtwdev))
> +		val |= BIT_SDIO_TX_CTRL_ALWAYS_RECOGNIZE;
>  	rtw_write32(rtwdev, REG_SDIO_TX_CTRL, val);
>  }
>  
> @@ -1341,6 +1360,7 @@ static void rtw_sdio_handle_interrupt(struct sdio_func *sdio_func)
>  	struct ieee80211_hw *hw = sdio_get_drvdata(sdio_func);
>  	struct rtw_sdio *rtwsdio;
>  	struct rtw_dev *rtwdev;
> +	u32 clear;
>  	u32 hisr;
>  
>  	rtwdev = hw->priv;
> @@ -1357,7 +1377,12 @@ static void rtw_sdio_handle_interrupt(struct sdio_func *sdio_func)
>  		rtw_sdio_rx_isr(rtwdev);
>  	}
>  
> -	rtw_write32(rtwdev, REG_SDIO_HISR, hisr);
> +	if (rtw_is_8723bs(rtwdev))
> +		clear = hisr & rtwsdio->irq_mask & RTW_SDIO_HISR_CLEAR_MASK;
> +	else
> +		clear = hisr & RTW_SDIO_HISR_CLEAR_MASK;
> +	if (clear)
> +		rtw_write32(rtwdev, REG_SDIO_HISR, clear);
>  
>  	rtwsdio->irq_thread = NULL;
>  }
> diff --git a/drivers/net/wireless/realtek/rtw88/sdio.h b/drivers/net/wireless/realtek/rtw88/sdio.h
> index aa088c512b9c..208c91446f82 100644
> --- a/drivers/net/wireless/realtek/rtw88/sdio.h
> +++ b/drivers/net/wireless/realtek/rtw88/sdio.h
> @@ -22,6 +22,7 @@
>  
>  /* SDIO Tx Control */
>  #define REG_SDIO_TX_CTRL			(SDIO_LOCAL_OFFSET + 0x0000)
> +#define BIT_SDIO_TX_CTRL_ALWAYS_RECOGNIZE	BIT(4)
>  
>  /*SDIO status timeout*/
>  #define REG_SDIO_TIMEOUT			(SDIO_LOCAL_OFFSET + 0x0002)
> @@ -77,6 +78,14 @@
>  /* the following two are RTL8188 SDIO Specific */
>  #define REG_SDIO_HISR_MCU_ERR			BIT(28)
>  #define REG_SDIO_HISR_TSF_BIT32_TOGGLE		BIT(29)
> +#define RTW_SDIO_HISR_CLEAR_MASK		\
> +	(REG_SDIO_HISR_TXERR | REG_SDIO_HISR_RXERR | \
> +	 REG_SDIO_HISR_TXFOVW | REG_SDIO_HISR_RXFOVW | \
> +	 REG_SDIO_HISR_TXBCNOK | REG_SDIO_HISR_TXBCNERR | \
> +	 REG_SDIO_HISR_C2HCMD | REG_SDIO_HISR_CPWM1 | \
> +	 REG_SDIO_HISR_CPWM2 | REG_SDIO_HISR_HSISR_IND | \
> +	 REG_SDIO_HISR_GTINT3_IND | REG_SDIO_HISR_GTINT4_IND | \
> +	 REG_SDIO_HISR_PSTIMEOUT | REG_SDIO_HISR_OCPINT)
>  
>  /* HCI Current Power Mode */
>  #define REG_SDIO_HCPWM				(SDIO_LOCAL_OFFSET + 0x0019)