From mboxrd@z Thu Jan 1 00:00:00 1970 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 5D1C1491591 for ; Thu, 17 Sep 2026 07:08:52 +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=1789628934; cv=none; b=bU7IuRDVkksZ5trYHQBGa6qwpUHHn477UCX1ijS5EWtpu9+si/P96ztTuoF0u2/XfQmEuyBz5CQG79+IE+taBoQYlCopU+rUT9NfmRdCo66jLCRFFBKo2CPJDlShCb4Xewc5l3zF4LItVu0oskyaKrFhw56C4pWYjEySecO6ysE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789628934; c=relaxed/simple; bh=PDFtCkUMe5xgCgX5ms0kKIDJuV9MuZTF0CtXgl87Z4k=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=gRORGpggxpOlmcbrxL0rjSKOcvLSvdzga0KJtF2XNJt9XWxKIMfakWzX9GUR69Eyk6IghVYb+7F0M8Bw1rBlIycpGSLl3AeSy6zQRX4LIHFs4+N8IUHTbwdth3gTJLrCAz3eBR+4UgeRkm/Ko8K/kCSy0c3XMiOaljlUdY9C3og= 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=RW44YZoU; dkim=pass (2048-bit key) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com header.b=RmDF9igX; 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="RW44YZoU"; dkim=pass (2048-bit key) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com header.b="RmDF9igX" Received: from pps.filterd (m0279872.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 68H61ESR133120 for ; Thu, 17 Sep 2026 07:08:51 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=qualcomm.com; h= cc:content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=qcppdkim1; bh= A7dL3ucP/imtNL8M2nWHaBKLW8DZgN5o/nieYjIGjzM=; b=RW44YZoU3AwpllwT pQCrFOiX60XozoBmw1eJYYb7ZQ0Wk5SXjZ2XAPtk55HJckrPWMMRQGPoX9RFFhdF a8ph/wt18EnO7/5L63OruGjTiDgn+hIUzmCY2NZNuj4T2S+7yk338Ii8QeLM864N upp/Bv6QkzF5Og27a64k4jgASi74gF3zV9lj2pycx+oLrX4+GBVDzBcaDlprQ2UT MPh79tPzebPXyQhdDl6WeB+nKDwkAZDvHoAsa/lcLs6QTA5z6ElSvwtD+FxAqtKG rGisxZpunCqQ25GlJV4Gdmbqw1XqKtqceZlTCUEnewl4zNlMOnUHxojv3cjgVoz2 viINAQ== Received: from mail-pj1-f72.google.com (mail-pj1-f72.google.com [209.85.216.72]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 4gqtn549nh-1 (version=TLSv1.3 cipher=TLS_AES_128_GCM_SHA256 bits=128 verify=NOT) for ; Thu, 17 Sep 2026 07:08:51 +0000 (GMT) Received: by mail-pj1-f72.google.com with SMTP id 98e67ed59e1d1-39e3f521346so422374a91.0 for ; Thu, 17 Sep 2026 00:08:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oss.qualcomm.com; s=google; t=1789628930; x=1790233730; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :content-type:mime-version:subject:date:from:from:to:cc:subject:date :message-id:reply-to:content-type; bh=A7dL3ucP/imtNL8M2nWHaBKLW8DZgN5o/nieYjIGjzM=; b=RmDF9igXxld/SLpUhR58DdkAIWIxTMESeNlZ1WZ+92GtLIJCK7aTaPDeH4mN7PJo7p XV4nbAR5SxJ4kGXrNYdh042FXRjhk21XTNxP1nxulCHZOVsJUmUfpOsPMVuOwrYb8AMb hIeNBW0IOnWDySAsHa7mjC6+YBuKZtGtnTFsQXSpob3QehUJtU6kIQTNXScLI3PkfHvG Ilehsw6BWk9vXYIvVtRaNmFXnwjrrLnjCvTiPxXLYXQoXSB4MrvYG8YeLo0P8JjlP1hU S2wdx1MxxRCbb0KucU7X86xCQUGpgO6oJbykq8Z7kL2wtoUPK3lKfAPccI7i0J5+Xq7/ 22Ng== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1789628930; x=1790233730; h=cc:to:in-reply-to:references: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=A7dL3ucP/imtNL8M2nWHaBKLW8DZgN5o/nieYjIGjzM=; b=iZVRfwryzxQIQPOoLhRkV56IQYy3bE/lGs8QrkL6HABMw5IKnr/oPVzCIJ5q20qAmq A5Qwyl8odUz4FnWK4ztBSRBUCul6velNdhCTYEIEW+IXbGUyK+hVwa2QPvU5sEnIOMxO dLcWeH4lV6J16C4A3UxdLpP+/UfFNt3J/GfIUCW8f0twlX12vQ6ftjBYR9bmm/WbCSX5 SGiZxxzAXaoXeufo+5GXRtvnsKVqDCyvI3D/KqyJMEEGMdAs5/GcL7sY3DYVfpG2ZQBb q7zVY4VzJukQVHvoyUHPEYZ9wXdTm3Cg4ux4eoWgKa8BMdzJftkG788CYzubtpErYVvl rCGA== X-Forwarded-Encrypted: i=1; AKwUvBydZ5jbjW2TPOQlP5bi4V732bxk0WbEOFe9h3r1B4xTh5IvP6mh642dTaaivnYEjMBTbc1HRZLah8ogZCI=@vger.kernel.org X-Gm-Message-State: AFuF++kHwKjzC3Ddrdzqh6dFABTrrblQhKUKipTBdysICxLumWGRk1E2 QUr8qXHf09HzY3+l3sRNN0UqdrlHK2vH7y63Uol1sHq05/T/+DpONeBdRBSTaSYkq8goXP4oaWo HUXPpy3yAS1v1xY+wLR8wk2DbkgHForvqQkgjMN3+SPvm1Bzw61DZg1eYUPFu0Xd+x1s= X-Gm-Gg: AYBFou0J6FeCMa57IX8lXA9tWGUzTxjDsLzMqVlKdXYqGIzqNCnmtZPQQt1VwnQYJjp Dn5FSu1dRPteVFG2id4BBqKLZZldTX2uPh2lrlQsGVgbvu8pLc/mhhyEJ6TiFBLc3K+nGSKxasH aurvdx0lPcYdcpy3ghy6MlxTYCBG8QCaE+H6wz52oQHODilyiNYxvlgyZeg0m/VWgpdCp7/Pkr1 xroyZRaSpdUUpXseKWK0ZawAh1WDHnvZTiJfqzYeSjvmh6T7R0nx9urdT12+8ltzL9P3W1GxLtG SFM99NzJ6Q+bdxIjAr2ly/C2kyqyw12RmraXs3cULmCzayUpf6b32j0WiPpa5kXDbM2l+Pppunh hzUEVBPtNYOXNL1HMgowZ5QD7+K+fcar6e7A= X-Received: by 2002:a17:90b:3ccb:b0:398:ba9e:75ff with SMTP id 98e67ed59e1d1-39e1e52627bmr13473456a91.21.1789628930273; Thu, 17 Sep 2026 00:08:50 -0700 (PDT) X-Received: by 2002:a17:90b:3ccb:b0:398:ba9e:75ff with SMTP id 98e67ed59e1d1-39e1e52627bmr13473403a91.21.1789628929744; Thu, 17 Sep 2026 00:08:49 -0700 (PDT) Received: from hu-krichai-hyd.qualcomm.com ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-33bf5e40494sm13280835eec.15.2026.09.17.00.08.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 17 Sep 2026 00:08:49 -0700 (PDT) From: Krishna Chaitanya Chundru Date: Thu, 17 Sep 2026 12:38:07 +0530 Subject: [PATCH v3 6/6] bus: mhi: host: mhi_phc: Update the Time sync logic to read 64 bit register value 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: 7bit Message-Id: <20260917-tsc_timesync-v3-6-6826d5d2d527@oss.qualcomm.com> References: <20260917-tsc_timesync-v3-0-6826d5d2d527@oss.qualcomm.com> In-Reply-To: <20260917-tsc_timesync-v3-0-6826d5d2d527@oss.qualcomm.com> To: Manivannan Sadhasivam , Jeff Hugo , Richard Cochran Cc: mhi@lists.linux.dev, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, Krishna Chaitanya Chundru X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1789628904; l=2155; i=krishna.chundru@oss.qualcomm.com; s=20230907; h=from:subject:message-id; bh=PDFtCkUMe5xgCgX5ms0kKIDJuV9MuZTF0CtXgl87Z4k=; b=buSyD+p+9ce7wxdFM3rWvxg7ISBYYLinSYPJpFZVQ/JTKyPD8HFIu4l89pamZwcXJ5OCHBlsx jU9mJ2iYS1iA7Yf4OdTsqm10MM0aO66EN6OZRTSTOs+sENrXkfM0pEk X-Developer-Key: i=krishna.chundru@oss.qualcomm.com; a=ed25519; pk=10CL2pdAKFyzyOHbfSWHCD0X0my7CXxj8gJScmn1FAg= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTE3MDA5NCBTYWx0ZWRfX1OIGXNeDnLLK yZXVVvVEz3qlKKnxahOmfh35IqKlpRTZw6AXp7sXTxO5xKq37c1guVQjeEfxfbBnMJKfukYpkVG yy2erdSKL6TVOceLNKZDCTUseOr5TmNJBf2JQa3nUHt/YbXXUYZ4NXosd8zxm//ahO7MxbKGL1Q 8EwRZBqYqH5iN/u2hg5eEbsGvnr2eEDWS31/EFPJUV5TcrXFcTFO8hbAM99s9oprIMtqiXZwV6a leWh6rNmLAsyg1zSb5Ht511KHt4Ck4rAztA6pIFv8fMuLe1mdYUQ4iTljs0mzSP4qirqE8GCuBO 2rDfQmmw+VWxFCgZ4L6Mb/ID/6tmdaqkroFYcVb50KuCpBOf7PD/4poRTqvV179HPan11vxx86E 6Vur9WKJ/zKSD7OdLSM6/K4rB0A/vpwwR/TErAcHAm9Yi9acOjtUVJy4k8+fTA6FNxnYvDaMG3T efIAAG5h0o9Bm+PXbhQ== X-Proofpoint-Spam-Info: AW1haW4tMjYwOTE3MDA5NCBTYWx0ZWRfX1lE+hSS71qKM qyfH+cMDgRsnNXMngb5NG9QIgj4wRGQkoMUkmRa99aN0J7RmwFG3XDzG7zpUYhb/ttVMa+RSekq LQ+nv/FZweXAwShTbckvvmTWqCFsFrM= X-Proofpoint-ORIG-GUID: _Z6dOQ9JQ9Zk1ZFQqW2At5BgpYWxz5bg X-Authority-Analysis: v=2.4 cv=K7O3jCWI c=1 sm=1 tr=0 ts=6aab9203 cx=c_pps a=RP+M6JBNLl+fLTcSJhASfg==:117 a=ZePRamnt/+rB5gQjfz0u9A==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yx91gb_oNiZeI1HMLzn7:22 a=EUspDBNiAAAA:8 a=-ftiAGXnolOcdJctExEA:9 a=QEXdDO2ut3YA:10 a=iS9zxrgQBfv6-_F4QbHw:22 X-Proofpoint-GUID: _Z6dOQ9JQ9Zk1ZFQqW2At5BgpYWxz5bg X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-17_01,2026-09-16_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 impostorscore=0 phishscore=0 bulkscore=0 priorityscore=1501 lowpriorityscore=0 spamscore=0 adultscore=0 suspectscore=0 clxscore=1015 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609170094 Instead of reading low and high of the mhi registers twice use 64 bit register value to avoid any time penalty. Signed-off-by: Krishna Chaitanya Chundru --- drivers/bus/mhi/host/mhi_phc.c | 47 ++++++++++++++++++++++++------------------ 1 file changed, 27 insertions(+), 20 deletions(-) diff --git a/drivers/bus/mhi/host/mhi_phc.c b/drivers/bus/mhi/host/mhi_phc.c index 783f05b5d144..b1d10431bd30 100644 --- a/drivers/bus/mhi/host/mhi_phc.c +++ b/drivers/bus/mhi/host/mhi_phc.c @@ -57,26 +57,33 @@ static int mhi_get_remote_tsc_time_sync(struct mhi_device *mhi_dev, struct mhi_t ptp_read_system_prets(sts); - /* - * Read the high dword twice around the low dword and retry if it - * changed, to avoid a torn read across a device-side rollover. - */ - do { - ret = mhi_read_reg(mhi_cntrl, mhi_tsync->time_reg, - TSC_TIMESYNC_TIME_HIGH_OFFSET, &hi); - if (ret) - break; - - ret = mhi_read_reg(mhi_cntrl, mhi_tsync->time_reg, - TSC_TIMESYNC_TIME_LOW_OFFSET, &lo); - if (ret) - break; - - ret = mhi_read_reg(mhi_cntrl, mhi_tsync->time_reg, - TSC_TIMESYNC_TIME_HIGH_OFFSET, &time->t_dev_hi); - } while (!ret && hi != time->t_dev_hi); - - time->t_dev_lo = lo; + if (mhi_cntrl->read_reg64) { + ret = mhi_read_reg64(mhi_cntrl, mhi_tsync->time_reg, + TSC_TIMESYNC_TIME_LOW_OFFSET, &val); + time->t_dev_lo = (u32)val; + time->t_dev_hi = (u32)(val >> 32); + } else { + /* + * Read the high dword twice around the low dword and retry if it + * changed, to avoid a torn read across a device-side rollover. + */ + do { + ret = mhi_read_reg(mhi_cntrl, mhi_tsync->time_reg, + TSC_TIMESYNC_TIME_HIGH_OFFSET, &hi); + if (ret) + break; + + ret = mhi_read_reg(mhi_cntrl, mhi_tsync->time_reg, + TSC_TIMESYNC_TIME_LOW_OFFSET, &lo); + if (ret) + break; + + ret = mhi_read_reg(mhi_cntrl, mhi_tsync->time_reg, + TSC_TIMESYNC_TIME_HIGH_OFFSET, &time->t_dev_hi); + } while (!ret && hi != time->t_dev_hi); + + time->t_dev_lo = lo; + } ptp_read_system_postts(sts); -- 2.34.1