From patchwork Wed Oct 2 02:31:18 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Chuang X-Patchwork-Id: 11170199 X-Patchwork-Delegate: kvalo@adurom.com Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E7D0A912 for ; Wed, 2 Oct 2019 02:31:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C837520815 for ; Wed, 2 Oct 2019 02:31:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729724AbfJBCbj (ORCPT ); Tue, 1 Oct 2019 22:31:39 -0400 Received: from rtits2.realtek.com ([211.75.126.72]:45995 "EHLO rtits2.realtek.com.tw" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729030AbfJBCbj (ORCPT ); Tue, 1 Oct 2019 22:31:39 -0400 Authenticated-By: X-SpamFilter-By: BOX Solutions SpamTrap 5.62 with qID x922VW5E031831, This message is accepted by code: ctloc85258 Received: from mail.realtek.com (RTITCASV01.realtek.com.tw[172.21.6.18]) by rtits2.realtek.com.tw (8.15.2/2.57/5.78) with ESMTPS id x922VW5E031831 (version=TLSv1 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT); Wed, 2 Oct 2019 10:31:32 +0800 Received: from localhost.localdomain (172.21.68.126) by RTITCASV01.realtek.com.tw (172.21.6.18) with Microsoft SMTP Server id 14.3.468.0; Wed, 2 Oct 2019 10:31:32 +0800 From: To: CC: , Subject: [PATCH v2 02/12] rtw88: pci: reset H2C queue indexes in a single write Date: Wed, 2 Oct 2019 10:31:18 +0800 Message-ID: <20191002023128.12090-3-yhchuang@realtek.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20191002023128.12090-1-yhchuang@realtek.com> References: <20191002023128.12090-1-yhchuang@realtek.com> MIME-Version: 1.0 X-Originating-IP: [172.21.68.126] Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Yan-Hsuan Chuang If the driver doesn't reset the host's and device's indexes in a single write, the indexes will become different in a short period. And it will confuse the DMA engine, make it start to process non-existed entries. Better to Write-1-to-reset the indexes, for the DMA engine to know that this is a reset of the H2C queue, not a kick off. Signed-off-by: Yan-Hsuan Chuang --- v1 -> v2 - rebase on top of wireless-drivers-next drivers/net/wireless/realtek/rtw88/pci.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/realtek/rtw88/pci.c b/drivers/net/wireless/realtek/rtw88/pci.c index d90928be663b..509743cfd70a 100644 --- a/drivers/net/wireless/realtek/rtw88/pci.c +++ b/drivers/net/wireless/realtek/rtw88/pci.c @@ -457,9 +457,9 @@ static void rtw_pci_reset_buf_desc(struct rtw_dev *rtwdev) /* reset read/write point */ rtw_write32(rtwdev, RTK_PCI_TXBD_RWPTR_CLR, 0xffffffff); - /* rest H2C Queue index */ - rtw_write32_set(rtwdev, RTK_PCI_TXBD_H2CQ_CSR, BIT_CLR_H2CQ_HOST_IDX); - rtw_write32_set(rtwdev, RTK_PCI_TXBD_H2CQ_CSR, BIT_CLR_H2CQ_HW_IDX); + /* reset H2C Queue index in a single write */ + rtw_write32_set(rtwdev, RTK_PCI_TXBD_H2CQ_CSR, + BIT_CLR_H2CQ_HOST_IDX | BIT_CLR_H2CQ_HW_IDX); } static void rtw_pci_reset_trx_ring(struct rtw_dev *rtwdev)