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Thu, 09 Nov 2023 09:32:11 +0000 Received: from nalasex01a.na.qualcomm.com (nalasex01a.na.qualcomm.com [10.47.209.196]) by NALASPPMTA05.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 3A99WApj002213 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 9 Nov 2023 09:32:10 GMT Received: from [10.217.219.216] (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.39; Thu, 9 Nov 2023 01:32:05 -0800 Message-ID: <65d2bba9-b04c-f91b-100a-ffb07e9b615a@quicinc.com> Date: Thu, 9 Nov 2023 15:02:01 +0530 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.13.1 Subject: Re: [PATCH v2 0/3] phy: qcom-qmp-pcie: Add support to keep refclk always on Content-Language: en-US To: Konrad Dybcio , Andy Gross , Bjorn Andersson , Vinod Koul , "Kishon Vijay Abraham I" , Rob Herring , Krzysztof Kozlowski , Conor Dooley CC: , , , , , , , , , References: <20231107-refclk_always_on-v2-0-de23962fc4b3@quicinc.com> <8a12ccba-908d-405a-8fcb-411d50a66ebe@linaro.org> From: Krishna Chaitanya Chundru In-Reply-To: <8a12ccba-908d-405a-8fcb-411d50a66ebe@linaro.org> X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nalasex01a.na.qualcomm.com (10.47.209.196) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: 8cMpDyCswSDpKModc_41BgKMsQz2H4aa X-Proofpoint-ORIG-GUID: 8cMpDyCswSDpKModc_41BgKMsQz2H4aa X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.987,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-11-09_08,2023-11-08_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 phishscore=0 adultscore=0 mlxlogscore=760 priorityscore=1501 suspectscore=0 malwarescore=0 bulkscore=0 clxscore=1015 spamscore=0 mlxscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311060000 definitions=main-2311090075 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231109_013225_912488_C5DEB5BB X-CRM114-Status: GOOD ( 17.47 ) X-BeenThere: linux-phy@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux Phy Mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-phy" Errors-To: linux-phy-bounces+linux-phy=archiver.kernel.org@lists.infradead.org On 11/8/2023 3:27 AM, Konrad Dybcio wrote: > > > On 11/7/23 13:26, Krishna chaitanya chundru wrote: >> This series adds support to provide refclk to endpoint even in low >> power states. >> >> Due to some platform specific issues with CLKREQ signal, it is not being >> propagated to the host and as host doesn't know the clkreq signal >> host is >> not sending refclk. Due to this endpoint is seeing linkdown and going >> to bad state. >> To avoid those ref clk should be provided always to the endpoint. The >> issue is coming only when ep intiates the L1.1 or L1.2 exit and clkreq >> is not being propagated properly to the host. > I'm gonna sound like a broken record, but: > > How much power does this consume? Would it matter if we kept this > clock always-on for all platforms with this version of the phy? > > Konrad We see about 22mw extra power consumption with refclk always on. We can't keep this property always on as there is impact on power consumption. - Krishna Chaitanya -- linux-phy mailing list linux-phy@lists.infradead.org https://lists.infradead.org/mailman/listinfo/linux-phy