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[RFC,v1,15/19] rtw88: main: Reserve 8 bytes of extra TX headroom for SDIO based cards

Message ID 20221227233020.284266-16-martin.blumenstingl@googlemail.com (mailing list archive)
State RFC
Delegated to: Kalle Valo
Headers show
Series rtw88: Add SDIO support | expand

Commit Message

Martin Blumenstingl Dec. 27, 2022, 11:30 p.m. UTC 
For SDIO host controllers with DMA support the TX buffer physical memory
address need to be aligned at an 8-byte boundary. Reserve 8 bytes of
extra TX headroom so we can align the data without re-allocating the
transmit buffer.

While here, also remove the TODO comment regarding extra headroom for
USB and SDIO. For SDIO the extra headroom is now handled and for USB it
was not needed so far.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
 drivers/net/wireless/realtek/rtw88/main.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/net/wireless/realtek/rtw88/main.c b/drivers/net/wireless/realtek/rtw88/main.c
index 9435cb43d1dc..bcdf1f8c8450 100644
--- a/drivers/net/wireless/realtek/rtw88/main.c
+++ b/drivers/net/wireless/realtek/rtw88/main.c
@@ -2161,9 +2161,11 @@  int rtw_register_hw(struct rtw_dev *rtwdev, struct ieee80211_hw *hw)
 	int max_tx_headroom = 0;
 	int ret;
 
-	/* TODO: USB & SDIO may need extra room? */
 	max_tx_headroom = rtwdev->chip->tx_pkt_desc_sz;
 
+	if (rtw_hci_type(rtwdev) == RTW_HCI_TYPE_SDIO)
+		max_tx_headroom += RTW_SDIO_DATA_PTR_ALIGN;
+
 	hw->extra_tx_headroom = max_tx_headroom;
 	hw->queues = IEEE80211_NUM_ACS;
 	hw->txq_data_size = sizeof(struct rtw_txq);