From nobody Sat Jul 25 03:05:31 2026 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 620483D1A8E for ; Mon, 20 Jul 2026 08:58:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.180.131 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784537887; cv=none; b=HqA8KJ+vfQ3ECqftSvN5FZUVGoyWA/JHOChoJZUP/1hVzQpmXIAyScnVxRSNoTosyag9KreAOw3/3b7oCgkIEOAf3PP3wiJK+RZt/LdRAtaPkfW4tLohwjf+DT11He0uREI1+1MA69eeLZiIoJz3h5tQVRSSXUxQt/A3Q7ydHWg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784537887; c=relaxed/simple; bh=owc/8QgSOr6t/UTWViEctCyxHem2AxUNXf9WbTkfbnw=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:To:Cc; b=d0Hh7XD4PfsSvvQh4Lo0+7c/u20J0phl3eIGi1sArIoALVtltzu37GuUG8Zla1jN5fg8LVlulNNoYmEPq9UqMEj8/bnYc/sHUuAUArXgXV5JZTB9qDtqxigi9CFCkbNUjAQ8M+k2+3dMnafCXyWdkulOaS8FFgbzXtCFbQu4p28= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oss.qualcomm.com; spf=pass smtp.mailfrom=oss.qualcomm.com; dkim=pass (2048-bit key) header.d=qualcomm.com header.i=@qualcomm.com header.b=ZMaPAWic; dkim=pass (2048-bit key) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com header.b=RmzJXj5E; arc=none smtp.client-ip=205.220.180.131 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oss.qualcomm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=oss.qualcomm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=qualcomm.com header.i=@qualcomm.com header.b="ZMaPAWic"; dkim=pass (2048-bit key) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com header.b="RmzJXj5E" Received: from pps.filterd (m0279871.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 66K6Ri8E1774889 for ; Mon, 20 Jul 2026 08:58:05 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=qualcomm.com; h= cc:content-transfer-encoding:content-type:date:from:message-id :mime-version:subject:to; s=qcppdkim1; bh=a5whM6vhtBpazDXtf1CdxM P8lSS5QwhAYXs3vVOgpWQ=; b=ZMaPAWicmbjTLS6vvz93LVomKHw0Bdvhr/bv+j ZlSQNEn350JfP6YoO0NwsOI2BRSwhtsgfjMmXUotbfgvqcdRpgXQpsq0+NTyf3/H nAi8lSYFXB52rCgqBDoXSqf1ZyUaVim/lryR8Jr2/BFmf/uTrj65EuQyPoIBzNPN hQLeoUU3eavcJvOdausQdVJH/oO0aXmCvYRg4p63ZcPP3Vjv/X1WQvVL7Ve/C71e vbkw6PLPXCkE9qwUTq4AVfVBpuSt8liwT1WwCPiKyBUgSjtfx+Cd+FO4D/a5QN6s nGfyeV7YUfsWa5dUh2BjkSuhSZKwlPpaTA4mAoFlWbl1iamw== Received: from mail-pl1-f200.google.com (mail-pl1-f200.google.com [209.85.214.200]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 4fg2af59xs-1 (version=TLSv1.3 cipher=TLS_AES_128_GCM_SHA256 bits=128 verify=NOT) for ; Mon, 20 Jul 2026 08:58:05 +0000 (GMT) Received: by mail-pl1-f200.google.com with SMTP id d9443c01a7336-2cce870a060so173192555ad.2 for ; Mon, 20 Jul 2026 01:58:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oss.qualcomm.com; s=google; t=1784537884; x=1785142684; darn=vger.kernel.org; h=cc:to:message-id:content-transfer-encoding:content-type :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to:content-type; bh=a5whM6vhtBpazDXtf1CdxMP8lSS5QwhAYXs3vVOgpWQ=; b=RmzJXj5En74/cgotmeBu53gALtHa2YsZHEDjk/BACvCFA3BZFBOdG5oVgZ9JoSFRiI 7pbYbm9+KJ9j3PA4fp6K8sjPUVtgQEWcF7ukCL3mCGGHeFFM2nEV5+47kQHobSMU30+u bcC4g8R+8rXH9tkZ6TIGEMyAx7T0S35Fxvar2By+gRp5kW2TawrMhY2vpSvFiNTHbwHJ RBnzfnSvYQ+sNjwZDDkVQCuPsDOI524tmAlO0R2++lHvYdA8PdizQCUj3ix9xAhyuQQX DmPdRQjTLQGQwLm3s2Y2RlpIupfAY2snStXRdjMVv6Z2JD+8SiWWTWo/6CkEEAVdUWwM +bYA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1784537884; x=1785142684; h=cc:to:message-id:content-transfer-encoding:content-type :mime-version:subject:date:from:x-gm-gg:x-gm-message-state:from:to :cc:subject:date:message-id:reply-to:content-type; bh=a5whM6vhtBpazDXtf1CdxMP8lSS5QwhAYXs3vVOgpWQ=; b=T4ajEblNnxfQX2QkmXMB2wu84UdOYIBshhGes9WcSTArnLo6BWD1/tkOLen6gcm6E+ Saa1XVWSt5A8dWYu/bCtHxVoGxk6l4zgmI+ihI9kr0XI7hEDyOMdBu8NEtJieqbE4+BU Xwtc8wcl0sUuZBFkeDOK5TtC+GmdJ12CKTWXeQe3WOGAC/lrYelAdoRlxmb6mxaBw2ui bxq4SPHovDoxI3pLupzH1990PI0i5EE9dNw45V8uycOWLi7fyRZLBtFsnQ2vUw7dMwNm LvkNpXicmtz4bqUbyLuXsqrgWCLgLTb49bYfYQM9mIE/DaiRRiK5Ki8BJUIQRlX1SeUb DRRQ== X-Forwarded-Encrypted: i=1; AHgh+RqmOiup96D6RLZSkqPRfr6DTcm7S1Sx6qbcdTrBiTRIGc3gcV/HC+C0hhO6X5xqYZ2qCwPjVgye3yyvJPo=@vger.kernel.org X-Gm-Message-State: AOJu0YxMPCSDtKMtCS6BbPvifbCl81HTb6g03N4gqwXJHUheXq5LNAvn W4gfarTTIq0mLJijG09Uf98yTfG2SVuKST6r0AKU0t9YJ2o3mek7rR4DLqtz+CE2MXUfdRsjWDg 28Ghok39+8p3Q1b1md1Q6UCEVPj2TqWvxSawJn1bG56mK2UyELP4gANd4YrFC0p1BOu0= X-Gm-Gg: AfdE7clBfmAlHjqB5LvzrmiBzd+IyLB6iqCMcOuuqUm75f2qrqZhMEXLj9jsFinytmB hDg+WfYQ7lWcYzaWkuy661MHsQZMY8txO6KIkIfM+r4Q85zmAxLeLVfBWIXb9yVZq/3HQHRQGoG cuOqkMtrd1btapnvttYgA6keBS/xsNJuOriJ51A86Or/gKF7iJuClLR16PmYlNMVpl5IOdK4rvw eNT3mvFXvWIjwC5XzbP2tJU+H6JE1yKXD9uiYlfam8/61ucU2Kxk0VAlYL634LXfXZsOm8NSyWH MXhOWcVFhJAUFOwne9iMDvFQIZfF6vvIhHRUaSzR5B5m8sY/jOiZyZ6HdqW7IepZO+zLwalBS3a CcmZMhzI3JTDJDJ6CEH2328NPhY+yg57wwQ== X-Received: by 2002:a17:903:a8f:b0:2c9:abe1:c352 with SMTP id d9443c01a7336-2cf3485335emr151177255ad.13.1784537883970; Mon, 20 Jul 2026 01:58:03 -0700 (PDT) X-Received: by 2002:a17:903:a8f:b0:2c9:abe1:c352 with SMTP id d9443c01a7336-2cf3485335emr151176885ad.13.1784537883376; Mon, 20 Jul 2026 01:58:03 -0700 (PDT) Received: from hu-ptalari-hyd.qualcomm.com ([202.46.22.19]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2cf346db036sm54076405ad.46.2026.07.20.01.57.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Jul 2026 01:58:02 -0700 (PDT) From: Praveen Talari Date: Mon, 20 Jul 2026 14:27:52 +0530 Subject: [PATCH v2] serial: qcom-geni: remove .pm callback, use runtime PM in startup/shutdown Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260720-remove_uart_change_state-v2-1-30153ce4333b@oss.qualcomm.com> X-B4-Tracking: v=1; b=H4sIAA/jXWoC/3WNQQ6CMBBFr0K6tqStBqor7mEIGWCQGqHaKY2Gc HcLuHUzyUve/DczQmeQ2CWZmcNgyNgxgjokrOlhvCE3bWSmhMpELs7c4WADVhM4X+1GRR48cpB djrk+AtaCxfenw868t+lruTNN9R0bv+6tRm/IW/fZ2kGu3i8jxf9MkFxyjfqU6RaUAllYovQ1w aOxw5DGw8plWb5vn9Fu2QAAAA== X-Change-ID: 20260709-remove_uart_change_state-a1f7e783aeb0 To: Greg Kroah-Hartman , Jiri Slaby , bjorn.andersson@oss.qualcomm.com, Konrad Dybcio , Andy Shevchenko Cc: linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, Mukesh Kumar Savaliya , aniket.randive@oss.qualcomm.com, chandana.chiluveru@oss.qualcomm.com, Praveen Talari X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1784537879; l=4575; i=praveen.talari@oss.qualcomm.com; s=20251114; h=from:subject:message-id; bh=owc/8QgSOr6t/UTWViEctCyxHem2AxUNXf9WbTkfbnw=; b=Vl3G6ilyAR2jQ0jxmV2tZIf+WmGPV5XTiuyFPmeWvw+Z/1/swJ4a+JLnRfhAZK/Y5RR0jLxtp xtwFSemKEAxA9DJcnNmvxvr0J3xCasyTPFvt/1SfxJWw6XKV9qCpzrz X-Developer-Key: i=praveen.talari@oss.qualcomm.com; a=ed25519; pk=NGK/88fjyHXgfhIKwag7+uIytOmyOypvZ/hDFaYPEss= X-Proofpoint-Spam-Info: AW1haW4tMjYwNzIwMDA5OSBTYWx0ZWRfX0r1ZjdDbxv+L 2zkrjhLSudQUYWy1f+jVrlaNbykeXih+AJWjSYaXke18lHJcDhhTmpR/K2ZDGFai4ea/v33Jc0f f8/LVVAwKC1aAVpOFRoNxtm9xPWnjZ4= X-Proofpoint-GUID: GD9MU9eB8KyamWw1WvpudckYt8sUqpLS X-Proofpoint-ORIG-GUID: GD9MU9eB8KyamWw1WvpudckYt8sUqpLS X-Authority-Analysis: v=2.4 cv=a+sAM0SF c=1 sm=1 tr=0 ts=6a5de31d cx=c_pps a=IZJwPbhc+fLeJZngyXXI0A==:117 a=fChuTYTh2wq5r3m49p7fHw==:17 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=3WHJM1ZQz_JShphwDgj5:22 a=bC-a23v3AAAA:8 a=EUspDBNiAAAA:8 a=Lm143-4zXO_JaeHAvGEA:9 a=QEXdDO2ut3YA:10 a=uG9DUKGECoFWVXl0Dc02:22 a=FO4_E8m0qiDe52t0p3_H:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzIwMDA5OSBTYWx0ZWRfX7PfEhZDm+NJO KWq+s/bynlaiufpkvynQNbx3pVxkgxbU8b3SLqmBjVoZoi6b8TK7KG6vMK8b0C9L5Z0lwyLZtDK 7cprkGtmCL3NhaqbUKjqM4JY8Fi+qsHcJ4cHZchMuVj9cgjG3ltwnVNpZhnRJMhOqCT1A6eJTyq MPBHL/vpHBosR0boOUUdvStdbeNQDJZaRGPTtkRdN8m1jfK1xNQq01dmTQ5tNOyE6z6ZjpJi5KD onUUFhxv1XdgY9Vg5ugPYrXZ6KDS6/R+b6v+JO07oKFbUpIvRFvNNE0U+GQQA1jN1X5+cxyaOnX J2Q5YuCwDloUzSi+EzshACxCVMFs8/lvM9JeXuAefnK0gKYPWGPfzcpMZ6/K11coVdXL9h/t9xL A3yO83SoYEfSr40CoU/mNYEuBoJ/0lrsjsyUiObEp9Thj3Vhnw9T6IpPMA4Y5R+8+uVRxWe7aFh zrJ/jUcZtyXduGfdwMw== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-20_01,2026-07-17_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 clxscore=1015 impostorscore=0 malwarescore=0 spamscore=0 phishscore=0 priorityscore=1501 lowpriorityscore=0 adultscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607200099 The driver currently relies on qcom_geni_serial_pm() through the uart_ops.pm callback to manage runtime PM references. However, the callback has a void return type, so failures from pm_runtime_resume_and_get() cannot be propagated to the caller. As a result, startup() may continue and access hardware even when the runtime PM resume operation failed, leading to register accesses while the device is not powered. Move runtime PM acquisition to qcom_geni_serial_startup() and release it to qcom_geni_serial_shutdown(). Since startup() can return an error, PM resume failures are now detected and propagated before any hardware initialization is performed. The startup/shutdown pair also provides a natural place to balance runtime PM references for normal port usage. During probe, uart_add_one_port() may configure the port before any user opens the TTY, meaning startup() has not yet been called. To keep the hardware powered during port registration, acquire a runtime PM reference with pm_runtime_resume_and_get() before uart_add_one_port() and release it with pm_runtime_put() afterwards. By moving runtime PM handling out of uart_ops.pm, resume failures are no longer silently ignored and all hardware accesses are guaranteed to occur while the device is powered. Signed-off-by: Praveen Talari --- Changes in v2: - Resolved clnag build error. - Link to v1: https://patch.msgid.link/20260710-remove_uart_change_state-v1= -1-8e8468da22a1@oss.qualcomm.com --- drivers/tty/serial/qcom_geni_serial.c | 37 +++++++++++++++++--------------= ---- 1 file changed, 18 insertions(+), 19 deletions(-) diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qco= m_geni_serial.c index 7ead87b4eb65..e7095f391397 100644 --- a/drivers/tty/serial/qcom_geni_serial.c +++ b/drivers/tty/serial/qcom_geni_serial.c @@ -1178,6 +1178,8 @@ static void qcom_geni_serial_shutdown(struct uart_por= t *uport) =20 qcom_geni_serial_cancel_tx_cmd(uport); uart_port_unlock_irq(uport); + + pm_runtime_put_sync(uport->dev); } =20 static void qcom_geni_serial_flush_buffer(struct uart_port *uport) @@ -1246,10 +1248,18 @@ static int qcom_geni_serial_startup(struct uart_por= t *uport) int ret; struct qcom_geni_serial_port *port =3D to_dev_port(uport); =20 + ret =3D pm_runtime_resume_and_get(uport->dev); + if (ret < 0) { + dev_err(uport->dev, "Failed to resume and get %d\n", ret); + return ret; + } + if (!port->setup) { ret =3D qcom_geni_serial_port_setup(uport); - if (ret) + if (ret) { + pm_runtime_put_sync(uport->dev); return ret; + } } =20 uart_port_lock_irq(uport); @@ -1724,22 +1734,6 @@ static int geni_serial_resource_init(struct uart_por= t *uport) return 0; } =20 -static void qcom_geni_serial_pm(struct uart_port *uport, - unsigned int new_state, unsigned int old_state) -{ - - /* If we've never been called, treat it as off */ - if (old_state =3D=3D UART_PM_STATE_UNDEFINED) - old_state =3D UART_PM_STATE_OFF; - - if (new_state =3D=3D UART_PM_STATE_ON && old_state =3D=3D UART_PM_STATE_O= FF) - pm_runtime_resume_and_get(uport->dev); - else if (new_state =3D=3D UART_PM_STATE_OFF && - old_state =3D=3D UART_PM_STATE_ON) - pm_runtime_put_sync(uport->dev); - -} - /** * qcom_geni_rs485_config - Configure RS485 settings for the UART port * @uport: Pointer to the UART port structure @@ -1778,7 +1772,6 @@ static const struct uart_ops qcom_geni_console_pops = =3D { .poll_put_char =3D qcom_geni_serial_poll_put_char, .poll_init =3D qcom_geni_serial_poll_init, #endif - .pm =3D qcom_geni_serial_pm, }; =20 static const struct uart_ops qcom_geni_uart_pops =3D { @@ -1795,7 +1788,6 @@ static const struct uart_ops qcom_geni_uart_pops =3D { .type =3D qcom_geni_serial_get_type, .set_mctrl =3D qcom_geni_serial_set_mctrl, .get_mctrl =3D qcom_geni_serial_get_mctrl, - .pm =3D qcom_geni_serial_pm, }; =20 static int qcom_geni_serial_probe(struct platform_device *pdev) @@ -1921,7 +1913,14 @@ static int qcom_geni_serial_probe(struct platform_de= vice *pdev) =20 devm_pm_runtime_enable(port->se.dev); =20 + ret =3D pm_runtime_resume_and_get(uport->dev); + if (ret < 0) { + dev_err(uport->dev, "Failed to resume and get %d\n", ret); + goto error; + } + ret =3D uart_add_one_port(drv, uport); + pm_runtime_put(uport->dev); if (ret) goto error; =20 --- base-commit: b9810cd75b9fb56a3425d391cba3f608502bd474 change-id: 20260709-remove_uart_change_state-a1f7e783aeb0 Best regards, -- =20 Praveen Talari