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[129.46.96.20]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-b4cd366f95asm8559358a12.51.2025.08.31.23.58.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 31 Aug 2025 23:58:21 -0700 (PDT) From: Yuanfang Zhang Date: Sun, 31 Aug 2025 23:58:15 -0700 Subject: [PATCH v4 3/3] coresight-tnoc: Add runtime PM support for Interconnect TNOC 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: <20250831-itnoc-v4-3-f0fb0ef822a5@oss.qualcomm.com> References: <20250831-itnoc-v4-0-f0fb0ef822a5@oss.qualcomm.com> In-Reply-To: <20250831-itnoc-v4-0-f0fb0ef822a5@oss.qualcomm.com> To: Suzuki K Poulose , Mike Leach , James Clark , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Alexander Shishkin Cc: kernel@oss.qualcomm.com, coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Yuanfang Zhang X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1756709897; l=1698; i=yuanfang.zhang@oss.qualcomm.com; s=20250814; h=from:subject:message-id; bh=ZRqDRcqJUID9wiPQfpPR1WcEMamloLO0sgtrKILAjZ4=; b=RoLU+Iza7O5TpoVvMZwc23uQWSolFpj4SfzRxppOcKkPY6mZ4URDE1xbKH8DIs3/Ssnphy84n Npq7139DM2lCGohtCNFwcX+JVdamp1E/bBCAR9t71gZwSWk7If4/s7j X-Developer-Key: i=yuanfang.zhang@oss.qualcomm.com; a=ed25519; pk=9oS/FoPW5k0CsqSDDrPlnV+kVIOUaAe0O5pr4M1wHgY= X-Authority-Analysis: v=2.4 cv=OemYDgTY c=1 sm=1 tr=0 ts=68b5440f cx=c_pps a=oF/VQ+ItUULfLr/lQ2/icg==:117 a=ouPCqIW2jiPt+lZRy3xVPw==:17 a=IkcTkHD0fZMA:10 a=yJojWOMRYYMA:10 a=EUspDBNiAAAA:8 a=qearADheJa7ujHrKWl4A:9 a=QEXdDO2ut3YA:10 a=3WC7DwWrALyhR5TkjVHa:22 X-Proofpoint-GUID: lYnSev6SQ_PJO_NVTrVLUtSV3IuLJUCd X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwODMwMDAyNCBTYWx0ZWRfX7Ow8Vb178XZJ 8DP4F/bSE/yrfPl5ZW6yEO6R066WQX2l7BWeBUsSGtvj0k8/GNJnX01Y/rUTRMCXNgsprbQzDEE +3CswWoxUZio8hHUYMUYrggGKfV++HSQxX0hxfmHSCqF/csYDO4Tl6kBNmipb+j4UZal0HjXEo5 nETQwhJvJzmGTL1leT2V+aCEjjnyMn4z59IkiALold4cn3R3fZG6sExN58a5YKs+9aYpCXZG3dz CBtOnIdIjYpHqfq4FdYfievopIOW4acoi6oMZT7qL/KT4tfD82i4La+h17lxCwfFp1SOkJBlkTb Xayby+y1+hduBpd+HoPOkU8SRwPyvH2HtbdSN8iK1GJhYMKgwdJuYHv9sM5f4JDLcjdTIrShvkr FfuvbbdC X-Proofpoint-ORIG-GUID: lYnSev6SQ_PJO_NVTrVLUtSV3IuLJUCd X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-09-01_03,2025-08-28_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 suspectscore=0 spamscore=0 bulkscore=0 priorityscore=1501 adultscore=0 clxscore=1015 phishscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2507300000 definitions=main-2508300024 This patch adds runtime power management support for platform-based CoreSight Interconnect TNOC (ITNOC) devices. It introduces suspend and resume callbacks to manage the APB clock (`pclk`) during device runtime transitions. Signed-off-by: Yuanfang Zhang --- drivers/hwtracing/coresight/coresight-tnoc.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/drivers/hwtracing/coresight/coresight-tnoc.c b/drivers/hwtracing/coresight/coresight-tnoc.c index 5be882300d79bc0173aa6a19d7da1d48c4aaca9c..2c5370497076536bfa868f0d80db775ef242968b 100644 --- a/drivers/hwtracing/coresight/coresight-tnoc.c +++ b/drivers/hwtracing/coresight/coresight-tnoc.c @@ -301,6 +301,28 @@ static void itnoc_remove(struct platform_device *pdev) pm_runtime_disable(&pdev->dev); } +#ifdef CONFIG_PM +static int itnoc_runtime_suspend(struct device *dev) +{ + struct trace_noc_drvdata *drvdata = dev_get_drvdata(dev); + + clk_disable_unprepare(drvdata->pclk); + + return 0; +} + +static int itnoc_runtime_resume(struct device *dev) +{ + struct trace_noc_drvdata *drvdata = dev_get_drvdata(dev); + + return clk_prepare_enable(drvdata->pclk); +} +#endif + +static const struct dev_pm_ops itnoc_dev_pm_ops = { + SET_RUNTIME_PM_OPS(itnoc_runtime_suspend, itnoc_runtime_resume, NULL) +}; + static const struct of_device_id itnoc_of_match[] = { { .compatible = "qcom,coresight-itnoc" }, {} @@ -314,6 +336,7 @@ static struct platform_driver itnoc_driver = { .name = "coresight-itnoc", .of_match_table = itnoc_of_match, .suppress_bind_attrs = true, + .pm = &itnoc_dev_pm_ops, }, }; -- 2.34.1