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From:   <yhchuang@realtek.com>
To:     <kvalo@codeaurora.org>
CC:     <linux-wireless@vger.kernel.org>, <briannorris@chromium.org>
Subject: [PATCH v2 2/6] rtw88: pci: reset dma when reset pci trx ring
Date:   Mon, 9 Dec 2019 15:21:35 +0800
Message-ID: <20191209072139.26068-3-yhchuang@realtek.com>
In-Reply-To: <20191209072139.26068-1-yhchuang@realtek.com>
References: <20191209072139.26068-1-yhchuang@realtek.com>
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Sender: linux-wireless-owner@vger.kernel.org
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From: Chin-Yen Lee <timlee@realtek.com>

When PCI trx rings are reset, the DMA engine should also be reset.
Otherswise, the rx_tag of rx flow is not synchronous to hw.

Remove DMA reset when rtw_pci_start() as we added it in
rtw_pci_setup().

Signed-off-by: Chin-Yen Lee <timlee@realtek.com>
Signed-off-by: Yan-Hsuan Chuang <yhchuang@realtek.com>
---

v1 -> v2
 * remove duplicated rtw_pci_dma_reset()

 drivers/net/wireless/realtek/rtw88/pci.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtw88/pci.c b/drivers/net/wireless/realtek/rtw88/pci.c
index 068f1bec88e6..c394df494c95 100644
--- a/drivers/net/wireless/realtek/rtw88/pci.c
+++ b/drivers/net/wireless/realtek/rtw88/pci.c
@@ -486,13 +486,6 @@ static void rtw_pci_disable_interrupt(struct rtw_dev *rtwdev,
 	rtwpci->irq_enabled = false;
 }
 
-static int rtw_pci_setup(struct rtw_dev *rtwdev)
-{
-	rtw_pci_reset_trx_ring(rtwdev);
-
-	return 0;
-}
-
 static void rtw_pci_dma_reset(struct rtw_dev *rtwdev, struct rtw_pci *rtwpci)
 {
 	/* reset dma and rx tag */
@@ -501,6 +494,16 @@ static void rtw_pci_dma_reset(struct rtw_dev *rtwdev, struct rtw_pci *rtwpci)
 	rtwpci->rx_tag = 0;
 }
 
+static int rtw_pci_setup(struct rtw_dev *rtwdev)
+{
+	struct rtw_pci *rtwpci = (struct rtw_pci *)rtwdev->priv;
+
+	rtw_pci_reset_trx_ring(rtwdev);
+	rtw_pci_dma_reset(rtwdev, rtwpci);
+
+	return 0;
+}
+
 static void rtw_pci_dma_release(struct rtw_dev *rtwdev, struct rtw_pci *rtwpci)
 {
 	struct rtw_pci_tx_ring *tx_ring;
@@ -518,8 +521,6 @@ static int rtw_pci_start(struct rtw_dev *rtwdev)
 	struct rtw_pci *rtwpci = (struct rtw_pci *)rtwdev->priv;
 	unsigned long flags;
 
-	rtw_pci_dma_reset(rtwdev, rtwpci);
-
 	spin_lock_irqsave(&rtwpci->irq_lock, flags);
 	rtw_pci_enable_interrupt(rtwdev, rtwpci);
 	spin_unlock_irqrestore(&rtwpci->irq_lock, flags);
-- 
2.17.1