From 71ee0d565985cbcf9f9c5c6b046e6d4ad52d0b3f Mon Sep 17 00:00:00 2001 From: Chin-Yen Lee Date: Mon, 27 Oct 2025 15:02:59 +0800 Subject: [PATCH] wifi: rtw88: 8822c: use fixed rate and bandwidth to reply CSI packets AP could trigger beamform and send NDPA packet with 6Mbps rate on bandwidth 80MHz, but RTL8822C can't reply CSI packet with the same setting. Therefore, force to use OFDM rate and bandwidth 20MHz instead. Signed-off-by: Chin-Yen Lee Signed-off-by: Ping-Ke Shih Link: https://patch.msgid.link/20251027070259.18931-1-pkshih@realtek.com --- drivers/net/wireless/realtek/rtw88/bf.c | 8 +++++++- drivers/net/wireless/realtek/rtw88/bf.h | 7 +++++++ 2 files changed, 14 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/realtek/rtw88/bf.c b/drivers/net/wireless/realtek/rtw88/bf.c index c827c4a2814b5..0d0ccbc7d00ca 100644 --- a/drivers/net/wireless/realtek/rtw88/bf.c +++ b/drivers/net/wireless/realtek/rtw88/bf.c @@ -124,8 +124,11 @@ void rtw_bf_init_bfer_entry_mu(struct rtw_dev *rtwdev, void rtw_bf_cfg_sounding(struct rtw_dev *rtwdev, struct rtw_vif *vif, enum rtw_trx_desc_rate rate) { + u8 csi_rsc = CSI_RSC_FOLLOW_RX_PACKET_BW; u32 psf_ctl = 0; - u8 csi_rsc = 0x1; + + if (rtwdev->chip->id == RTW_CHIP_TYPE_8822C) + csi_rsc = CSI_RSC_PRIMARY_20M_BW; psf_ctl = rtw_read32(rtwdev, REG_BBPSF_CTRL) | BIT_WMAC_USE_NDPARATE | @@ -387,6 +390,9 @@ void rtw_bf_cfg_csi_rate(struct rtw_dev *rtwdev, u8 rssi, u8 cur_rate, csi_cfg = rtw_read32(rtwdev, REG_BBPSF_CTRL) & ~BIT_MASK_CSI_RATE; cur_rrsr = rtw_read16(rtwdev, REG_RRSR); + if (rtwdev->chip->id == RTW_CHIP_TYPE_8822C) + csi_cfg |= BIT_CSI_FORCE_RATE; + if (rssi >= 40) { if (cur_rate != DESC_RATE54M) { cur_rrsr |= BIT(DESC_RATE54M); diff --git a/drivers/net/wireless/realtek/rtw88/bf.h b/drivers/net/wireless/realtek/rtw88/bf.h index 7b40c2c038560..a5d3010e6be6e 100644 --- a/drivers/net/wireless/realtek/rtw88/bf.h +++ b/drivers/net/wireless/realtek/rtw88/bf.h @@ -33,6 +33,7 @@ #define BIT_SHIFT_R_MU_RL 12 #define BIT_SHIFT_WMAC_TXMU_ACKPOLICY 4 #define BIT_SHIFT_CSI_RATE 24 +#define BIT_CSI_FORCE_RATE BIT(15) #define BIT_MASK_R_MU_RL (R_MU_RL << BIT_SHIFT_R_MU_RL) #define BIT_MASK_R_MU_TABLE_VALID 0x3f @@ -48,6 +49,12 @@ #define RTW_SND_CTRL_REMOVE 0x98 #define RTW_SND_CTRL_SOUNDING 0x9B +enum csi_rsc { + CSI_RSC_PRIMARY_20M_BW = 0, + CSI_RSC_FOLLOW_RX_PACKET_BW = 1, + CSI_RSC_DUPLICATE_MODE = 2, +}; + enum csi_seg_len { HAL_CSI_SEG_4K = 0, HAL_CSI_SEG_8K = 1, -- 2.47.3