From patchwork Wed Apr 5 20:07:21 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Martin Blumenstingl X-Patchwork-Id: 670753 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 03335C77B70 for ; Wed, 5 Apr 2023 20:07:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230465AbjDEUHq (ORCPT ); Wed, 5 Apr 2023 16:07:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44696 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233280AbjDEUHn (ORCPT ); Wed, 5 Apr 2023 16:07:43 -0400 Received: from mail-ed1-x52e.google.com (mail-ed1-x52e.google.com [IPv6:2a00:1450:4864:20::52e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 512A03C38; Wed, 5 Apr 2023 13:07:39 -0700 (PDT) Received: by mail-ed1-x52e.google.com with SMTP id y4so144054872edo.2; Wed, 05 Apr 2023 13:07:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=20210112; t=1680725257; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=WO38kEmYBLiR9apBDiKwyBSAdNe1y1sU2/3Yb1rUmYo=; b=jsrVBzby5D4BDCQbj3GR5B6c6T32GV99fkjthoYWR2b1cVxDM21r5HvI9R8Us9NVKJ CP2hxhw6lcnzqTwF8wROcO5xe0ve++moT1prhGs4+LLRIsdM8qj14izeg/H3+E9nRwFS 1vvrIV1nBmTIIuVKeXp9PIURKub2QR6DJ1F1Uc2nFv2LQXdzF0vywUrASg7t8zkERb14 BpCivtxpd0ZcRaBG0HlhYI8KFVKQXQqxjv9X3kToXvsV+5QuDn49Hr/iEcZCoX1lz0gk LsfLuvwyrODCVnBNEugwmh3a8aLZnDwJ45KOb7utvoJ1THTEcB/jM85F1Ju4csjHiijx 5MVg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1680725257; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=WO38kEmYBLiR9apBDiKwyBSAdNe1y1sU2/3Yb1rUmYo=; b=7gQ0egpQ5WTejuigI17jvN+pbIX1H6p+vEsqGUaUpKCdKEGPTfmo+kcrwrMrnt7WC6 6sivTcuimzObPOhrcrjDYAWfHzwQI091RBQLGK0rr239EU0MSpuHaF6iPkTYBHCSLyZT 6WCd0GZMbaqFU7PpHDp9sS2pYzc1SedbzjU7LGbXvBHuCmj9BVouFG4bfnSMKo08yEhN oJ2NdwapX4DrOOQVEbzH2ySJFUVCIN5Nxgx2Fk5SypsYS/K7xhO05dI2xCjIkj+0SBOG hwegCBGWsmBzXga/hdFcfJpdUyUECfsOy4e2ugg1DyrT7pWgtW1kE2gRRhUWRYlNRBC1 UYwA== X-Gm-Message-State: AAQBX9eUUq3VvGBP/sPyvWxuLDVrBLnl9dM9zCD8FxNPVS2imYoNf2Ko fLS1VIljX7g8YQ+SzvIzGt/qz0Up9ZEdvA== X-Google-Smtp-Source: AKy350ZyXvCoZGazUJThTS6AbtPbulJXy/HPU+72wR4lh+x/3oybHn8hN5z4AB68Bd9JlQd8+ZSDCA== X-Received: by 2002:a17:906:3c13:b0:947:895a:bd82 with SMTP id h19-20020a1709063c1300b00947895abd82mr4113693ejg.56.1680725257434; Wed, 05 Apr 2023 13:07:37 -0700 (PDT) Received: from localhost.localdomain (dynamic-2a01-0c22-7a4e-3100-0000-0000-0000-0e63.c22.pool.telefonica.de. [2a01:c22:7a4e:3100::e63]) by smtp.googlemail.com with ESMTPSA id a23-20020a170906369700b0092a59ee224csm7724873ejc.185.2023.04.05.13.07.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 05 Apr 2023 13:07:37 -0700 (PDT) From: Martin Blumenstingl To: linux-wireless@vger.kernel.org Cc: Yan-Hsuan Chuang , Kalle Valo , Ulf Hansson , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-mmc@vger.kernel.org, Chris Morgan , Nitin Gupta , Neo Jou , Pkshih , Jernej Skrabec , Larry Finger , =?utf-8?q?Pali_Roh=C3=A1r?= , Simon Horman , Martin Blumenstingl Subject: [PATCH v5 1/9] wifi: rtw88: Clear RTW_FLAG_POWERON early in rtw_mac_power_switch() Date: Wed, 5 Apr 2023 22:07:21 +0200 Message-Id: <20230405200729.632435-2-martin.blumenstingl@googlemail.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230405200729.632435-1-martin.blumenstingl@googlemail.com> References: <20230405200729.632435-1-martin.blumenstingl@googlemail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org The SDIO HCI implementation needs to know when the MAC is powered on. This is needed because 32-bit register access has to be split into 4x 8-bit register access when the MAC is not fully powered on or while powering off. When the MAC is powered on 32-bit register access can be used to reduce the number of transfers but splitting into 4x 8-bit register access still works in that case. During the power on sequence is how RTW_FLAG_POWERON is only set when the power on sequence has completed successfully. During power off however RTW_FLAG_POWERON is set. This means that the upcoming SDIO HCI implementation does not know that it has to use 4x 8-bit register accessors. Clear the RTW_FLAG_POWERON flag early when powering off the MAC so the whole power off sequence is processed with RTW_FLAG_POWERON unset. This will make it possible to use the RTW_FLAG_POWERON flag in the upcoming SDIO HCI implementation. Note that a failure in rtw_pwr_seq_parser() while applying chip->pwr_off_seq can theoretically result in the RTW_FLAG_POWERON flag being cleared while the chip is still powered on. However, depending on when the failure occurs in the power off sequence the chip may be on or off. Even the original approach of clearing RTW_FLAG_POWERON only when the power off sequence has been applied successfully could end up in some corner case where the chip is powered off but RTW_FLAG_POWERON was not cleared. Reviewed-by: Ping-Ke Shih Signed-off-by: Martin Blumenstingl --- Changes since v4: - none Changes since v3: - added Ping-Ke's reviewed-by (thank you!) Changes since v2: - improve patch description about corner cases when clearing RTW_FLAG_POWERON Changes since v1: - This replaces a previous patch called "rtw88: hci: Add an optional power_switch() callback to rtw_hci_ops" which added a new callback to the HCI ops. drivers/net/wireless/realtek/rtw88/mac.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/realtek/rtw88/mac.c b/drivers/net/wireless/realtek/rtw88/mac.c index f3a566cf979b..cfdfc8a2c836 100644 --- a/drivers/net/wireless/realtek/rtw88/mac.c +++ b/drivers/net/wireless/realtek/rtw88/mac.c @@ -273,6 +273,9 @@ static int rtw_mac_power_switch(struct rtw_dev *rtwdev, bool pwr_on) if (pwr_on == cur_pwr) return -EALREADY; + if (!pwr_on) + clear_bit(RTW_FLAG_POWERON, rtwdev->flags); + pwr_seq = pwr_on ? chip->pwr_on_seq : chip->pwr_off_seq; ret = rtw_pwr_seq_parser(rtwdev, pwr_seq); if (ret) @@ -280,8 +283,6 @@ static int rtw_mac_power_switch(struct rtw_dev *rtwdev, bool pwr_on) if (pwr_on) set_bit(RTW_FLAG_POWERON, rtwdev->flags); - else - clear_bit(RTW_FLAG_POWERON, rtwdev->flags); return 0; }