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[2620:137:e000::1:20]) by mx.google.com with ESMTP id jj13-20020a170903048d00b0019d2142ffffsi116853plb.295.2023.03.16.13.34.03; Thu, 16 Mar 2023 13:34:40 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@chromium.org header.s=google header.b=TibbCxby; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=chromium.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230304AbjCPUV1 (ORCPT + 99 others); Thu, 16 Mar 2023 16:21:27 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51828 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230202AbjCPUVX (ORCPT ); Thu, 16 Mar 2023 16:21:23 -0400 Received: from mail-pj1-x102c.google.com (mail-pj1-x102c.google.com [IPv6:2607:f8b0:4864:20::102c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 640E5900A9 for ; Thu, 16 Mar 2023 13:21:21 -0700 (PDT) Received: by mail-pj1-x102c.google.com with SMTP id f6-20020a17090ac28600b0023b9bf9eb63so2781422pjt.5 for ; Thu, 16 Mar 2023 13:21:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1678998081; 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=g57LqyNVPd4QtvwDpadq5p0zhAPNVIWZbBGClF8fQN4=; b=TibbCxbyBEZEYx/uzkmczi2osDWuyysnFNb7UXs3hCFZQtiCLHPDBLo+h0TaUIqtSS LXN+A7+bVvfxR3164Co4ZTPPvbcvJHJD6RwZamz7cg69L8SZXrOluqktWQwOCjLyhsL1 VmUKIBoqTGOaQ3RiLfTTD6lsheEfjtiptn5bo= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1678998081; 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=g57LqyNVPd4QtvwDpadq5p0zhAPNVIWZbBGClF8fQN4=; b=NRl+gP5omCpQyb+HWo9SKqxMxfJmuM6mb5Yg5633wuHci4sH2We/Duk5UwTa4cJk7Q t2FeXbF/Qo+eSk6bjYTHxCm9VtCWLjkUk93gDlrow/OGWXgcTs7AdpC5aH0y+Hx2/ba7 auMClDJxMPZdLHnKPzqMk+Vai6lJmdjokq0jGRgi9Q6PsKWQm9H5hGPQvaD1yXOqjasy hcEvbRdIFj/D8InRZUNcliFAiYKskFxmH/iOx/897GRP07SqAY04GkC8cGU8KxaMc2Mx YWR9fihB/cnzmV9U4Og3MVzS9t2NR+eR7ESb7rNN2jJQ2Lby7CB6X6Rc8nI957/d7Wfp BJeA== X-Gm-Message-State: AO0yUKX4hpCnCjmX/cRj2OMrLwBH1cfPwQBKtYKOIGbqcDaVTlx5Se1Q lxip0G8mKkPUhcnZ7tZDUcHQZQ== X-Received: by 2002:a17:90a:1903:b0:233:76bd:9faa with SMTP id 3-20020a17090a190300b0023376bd9faamr5352705pjg.47.1678998080936; Thu, 16 Mar 2023 13:21:20 -0700 (PDT) Received: from tictac2.mtv.corp.google.com ([2620:15c:9d:2:4db6:6f23:6ad2:998d]) by smtp.gmail.com with ESMTPSA id b4-20020a17090a5a0400b0023acdac248dsm24114pjd.15.2023.03.16.13.21.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 16 Mar 2023 13:21:20 -0700 (PDT) From: Douglas Anderson To: Bjorn Andersson , Greg Kroah-Hartman Cc: linux-arm-msm@vger.kernel.org, Jiri Slaby , Bartosz Golaszewski , Daniel Thompson , kgdb-bugreport@lists.sourceforge.net, Konrad Dybcio , linux-serial@vger.kernel.org, Douglas Anderson , linux-kernel@vger.kernel.org Subject: [RESEND PATCH 1/2] serial: uart_poll_init() should power on the UART Date: Thu, 16 Mar 2023 13:20:56 -0700 Message-Id: <20230316132027.RESEND.1.I106c39498d8094c6f5e7ada42c7db17aa5c64e48@changeid> X-Mailer: git-send-email 2.40.0.rc1.284.g88254d51c5-goog In-Reply-To: <20230316202057.4070382-1-dianders@chromium.org> References: <20230316202057.4070382-1-dianders@chromium.org> MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1760557930804157951?= X-GMAIL-MSGID: =?utf-8?q?1760557930804157951?= On Qualcomm devices which use the "geni" serial driver, kdb/kgdb won't be very happy if you use it but the resources of the port haven't been powered on. Today kdb/kgdb rely on someone else powering the port on. This could be the normal kernel console or an agetty running. Let's fix this to explicitly power things on when setting up a polling driver. Signed-off-by: Douglas Anderson --- drivers/tty/serial/serial_core.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index 2bd32c8ece39..b14b5ed6fff4 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -2593,6 +2593,7 @@ static int uart_poll_init(struct tty_driver *driver, int line, char *options) { struct uart_driver *drv = driver->driver_state; struct uart_state *state = drv->state + line; + enum uart_pm_state pm_state; struct tty_port *tport; struct uart_port *port; int baud = 9600; @@ -2610,6 +2611,9 @@ static int uart_poll_init(struct tty_driver *driver, int line, char *options) goto out; } + pm_state = state->pm_state; + uart_change_pm(state, UART_PM_STATE_ON); + if (port->ops->poll_init) { /* * We don't set initialized as we only initialized the hw, @@ -2626,6 +2630,8 @@ static int uart_poll_init(struct tty_driver *driver, int line, char *options) console_list_unlock(); } out: + if (ret) + uart_change_pm(state, pm_state); mutex_unlock(&tport->mutex); return ret; }