From mboxrd@z Thu Jan 1 00:00:00 1970 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9CFCFC433F5 for ; Mon, 15 Nov 2021 23:11:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 86BF561181 for ; Mon, 15 Nov 2021 23:11:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243924AbhKOXOH (ORCPT ); Mon, 15 Nov 2021 18:14:07 -0500 Received: from mail.kernel.org ([198.145.29.99]:39112 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244025AbhKOTIZ (ORCPT ); Mon, 15 Nov 2021 14:08:25 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 363AA63402; Mon, 15 Nov 2021 18:17:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1637000278; bh=968QfDD1pURssI5vp7c5C92KofDfJ4bAUDofdb6tsAY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ossZEH635yzLv4AfqME6mFfYB5I3fVOpiKjGBIl1bnOM7DsoOaY7L5NRCKa3VnO0R mRQmCYdRlQM/yZTwcTdwknYcHnsVVJResD6d372xUc2qnuJxfFUAXIVszbx5y8/Y4N rzNwlbpSBu0RbD8kLgvfO115SnVxIFDfwgghhg+U= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Tony Lindgren , Sasha Levin Subject: [PATCH 5.14 569/849] bus: ti-sysc: Fix timekeeping_suspended warning on resume Date: Mon, 15 Nov 2021 18:00:52 +0100 Message-Id: <20211115165439.495201728@linuxfoundation.org> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211115165419.961798833@linuxfoundation.org> References: <20211115165419.961798833@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Tony Lindgren [ Upstream commit b3e9431854e8f305385d5de225441c0477b936cb ] On resume we can get a warning at kernel/time/timekeeping.c:824 for timekeeping_suspended. Let's fix this by adding separate functions for sysc_poll_reset_sysstatus() and sysc_poll_reset_sysconfig() and have the new functions handle also timekeeping_suspended. If iopoll at some point supports timekeeping_suspended, we can just drop the custom handling from these functions. Fixes: d46f9fbec719 ("bus: ti-sysc: Use optional clocks on for enable and wait for softreset bit") Signed-off-by: Tony Lindgren Signed-off-by: Sasha Levin --- drivers/bus/ti-sysc.c | 65 +++++++++++++++++++++++++++++++++++-------- 1 file changed, 53 insertions(+), 12 deletions(-) diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c index 418ada474a85d..dd149cffe5e5b 100644 --- a/drivers/bus/ti-sysc.c +++ b/drivers/bus/ti-sysc.c @@ -17,6 +17,7 @@ #include #include #include +#include #include #include @@ -223,37 +224,77 @@ static u32 sysc_read_sysstatus(struct sysc *ddata) return sysc_read(ddata, offset); } -/* Poll on reset status */ -static int sysc_wait_softreset(struct sysc *ddata) +static int sysc_poll_reset_sysstatus(struct sysc *ddata) { - u32 sysc_mask, syss_done, rstval; - int syss_offset, error = 0; - - if (ddata->cap->regbits->srst_shift < 0) - return 0; - - syss_offset = ddata->offsets[SYSC_SYSSTATUS]; - sysc_mask = BIT(ddata->cap->regbits->srst_shift); + int error, retries; + u32 syss_done, rstval; if (ddata->cfg.quirks & SYSS_QUIRK_RESETDONE_INVERTED) syss_done = 0; else syss_done = ddata->cfg.syss_mask; - if (syss_offset >= 0) { + if (likely(!timekeeping_suspended)) { error = readx_poll_timeout_atomic(sysc_read_sysstatus, ddata, rstval, (rstval & ddata->cfg.syss_mask) == syss_done, 100, MAX_MODULE_SOFTRESET_WAIT); + } else { + retries = MAX_MODULE_SOFTRESET_WAIT; + while (retries--) { + rstval = sysc_read_sysstatus(ddata); + if ((rstval & ddata->cfg.syss_mask) == syss_done) + return 0; + udelay(2); /* Account for udelay flakeyness */ + } + error = -ETIMEDOUT; + } - } else if (ddata->cfg.quirks & SYSC_QUIRK_RESET_STATUS) { + return error; +} + +static int sysc_poll_reset_sysconfig(struct sysc *ddata) +{ + int error, retries; + u32 sysc_mask, rstval; + + sysc_mask = BIT(ddata->cap->regbits->srst_shift); + + if (likely(!timekeeping_suspended)) { error = readx_poll_timeout_atomic(sysc_read_sysconfig, ddata, rstval, !(rstval & sysc_mask), 100, MAX_MODULE_SOFTRESET_WAIT); + } else { + retries = MAX_MODULE_SOFTRESET_WAIT; + while (retries--) { + rstval = sysc_read_sysconfig(ddata); + if (!(rstval & sysc_mask)) + return 0; + udelay(2); /* Account for udelay flakeyness */ + } + error = -ETIMEDOUT; } return error; } +/* Poll on reset status */ +static int sysc_wait_softreset(struct sysc *ddata) +{ + int syss_offset, error = 0; + + if (ddata->cap->regbits->srst_shift < 0) + return 0; + + syss_offset = ddata->offsets[SYSC_SYSSTATUS]; + + if (syss_offset >= 0) + error = sysc_poll_reset_sysstatus(ddata); + else if (ddata->cfg.quirks & SYSC_QUIRK_RESET_STATUS) + error = sysc_poll_reset_sysconfig(ddata); + + return error; +} + static int sysc_add_named_clock_from_child(struct sysc *ddata, const char *name, const char *optfck_name) -- 2.33.0