This is needed in order to make USB RX aggregation work with RTL8811CU
(and presumably RTL8822BU and RTL8822CU also).
I don't know what BIT_DMA_BURST_CNT, BIT_DMA_MODE, and BIT_DROP_DATA_EN
are doing.
Tested with RTL8811CU and RTL8723DU.
The RX speed is unchanged in my tests.
Tested-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
Signed-off-by: Bitterblue Smith <rtl8821cerfe2@xxxxxxxxx>
---
v3:
- Add Tested-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
v2:
- Move the code to rtw_usb_interface_cfg.
- Let RTL8723DU and all other USB devices use it, not just RTL8822CU,
RTL8822BU, and RTL8821CU.
- Use the speed member of struct usb_device to determine the USB speed
instead of reading hardware registers.
- Update the subject line.
- Add more information to the commit message.
- Rebase on top of the latest rtw-next.
---
drivers/net/wireless/realtek/rtw88/reg.h | 6 ++++++
drivers/net/wireless/realtek/rtw88/usb.c | 23 ++++++++++++++++++++++-
2 files changed, 28 insertions(+), 1 deletion(-)
diff --git a/drivers/net/wireless/realtek/rtw88/reg.h b/drivers/net/wireless/realtek/rtw88/reg.h
index e7b24465f549..4d9b8668e8b0 100644
--- a/drivers/net/wireless/realtek/rtw88/reg.h
+++ b/drivers/net/wireless/realtek/rtw88/reg.h
@@ -322,6 +322,12 @@
#define REG_RXDMA_DPR 0x028C
#define REG_RXDMA_MODE 0x0290
#define BIT_DMA_MODE BIT(1)
+#define BIT_DMA_BURST_CNT GENMASK(3, 2)
+#define BIT_DMA_BURST_SIZE GENMASK(5, 4)
+#define BIT_DMA_BURST_SIZE_64 2
+#define BIT_DMA_BURST_SIZE_512 1
+#define BIT_DMA_BURST_SIZE_1024 0
+
#define REG_RXPKTNUM 0x02B0
#define REG_INT_MIG 0x0304
diff --git a/drivers/net/wireless/realtek/rtw88/usb.c b/drivers/net/wireless/realtek/rtw88/usb.c
index 9145c11a063e..1c40d46a7eb4 100644
--- a/drivers/net/wireless/realtek/rtw88/usb.c
+++ b/drivers/net/wireless/realtek/rtw88/usb.c
@@ -720,9 +720,30 @@ static void rtw_usb_link_ps(struct rtw_dev *rtwdev, bool enter)
/* empty function for rtw_hci_ops */
}
+static void rtw_usb_init_burst_pkt_len(struct rtw_dev *rtwdev)
+{
+ struct rtw_usb *rtwusb = rtw_get_usb_priv(rtwdev);
+ enum usb_device_speed speed = rtwusb->udev->speed;
+ u8 rxdma, burst_size;
+
+ rxdma = BIT_DMA_BURST_CNT | BIT_DMA_MODE;
+
+ if (speed == USB_SPEED_SUPER)
+ burst_size = BIT_DMA_BURST_SIZE_1024;
+ else if (speed == USB_SPEED_HIGH)
+ burst_size = BIT_DMA_BURST_SIZE_512;
+ else
+ burst_size = BIT_DMA_BURST_SIZE_64;
+
+ u8p_replace_bits(&rxdma, burst_size, BIT_DMA_BURST_SIZE);
+
+ rtw_write8(rtwdev, REG_RXDMA_MODE, rxdma);
+ rtw_write16_set(rtwdev, REG_TXDMA_OFFSET_CHK, BIT_DROP_DATA_EN);
+}
+
static void rtw_usb_interface_cfg(struct rtw_dev *rtwdev)
{
- /* empty function for rtw_hci_ops */
+ rtw_usb_init_burst_pkt_len(rtwdev);
}
static struct rtw_hci_ops rtw_usb_ops = {
--
2.45.2
