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[129.46.96.20]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-246ed91ee20sm92497015ad.136.2025.08.28.02.27.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 Aug 2025 02:27:29 -0700 (PDT) From: Yuanfang Zhang Date: Thu, 28 Aug 2025 02:27:24 -0700 Subject: [PATCH v3 3/3] coresight-tnoc: Add runtime PM support for Interconnect TNOC Precedence: bulk X-Mailing-List: linux-arm-msm@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: <20250828-itnoc-v3-3-f1b55dea7a27@oss.qualcomm.com> References: <20250828-itnoc-v3-0-f1b55dea7a27@oss.qualcomm.com> In-Reply-To: <20250828-itnoc-v3-0-f1b55dea7a27@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=1756373245; l=1698; i=yuanfang.zhang@oss.qualcomm.com; s=20250814; h=from:subject:message-id; bh=o+5/ACwsPDXaRMmwhSug61zH+Sv2mKJhHu/g8cXlGAs=; b=ilhqjytLS638zwMPR8kFJ/BYFsh+0ivhmo7Xklxsa8n4A7l49eb/ttMdW9+Ms3EmE4w7v4fuG ep3zeVkPCiaAko6vEjW7vzVFmKwBjdMqQjwMaWGaHyNIzMJygusBs0P X-Developer-Key: i=yuanfang.zhang@oss.qualcomm.com; a=ed25519; pk=9oS/FoPW5k0CsqSDDrPlnV+kVIOUaAe0O5pr4M1wHgY= X-Authority-Analysis: v=2.4 cv=Z/vsHGRA c=1 sm=1 tr=0 ts=68b02103 cx=c_pps a=oF/VQ+ItUULfLr/lQ2/icg==:117 a=ouPCqIW2jiPt+lZRy3xVPw==:17 a=IkcTkHD0fZMA:10 a=2OwXVqhp2XgA:10 a=EUspDBNiAAAA:8 a=qearADheJa7ujHrKWl4A:9 a=QEXdDO2ut3YA:10 a=3WC7DwWrALyhR5TkjVHa:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwODIzMDAzMyBTYWx0ZWRfX6qUFGTjJwhhl S0byhj8NhfV0RHO8tx0eP224ZX0gYhDsmlPu+ukYZMdML+D4AlHvZJLee/iDA0caH8gxCdPmeeK GbKv+c095BFYcINDoYlRcEAY2iM8pCgXTHgQfhgC4k3bmbW4Kfa+/pLalknxkPF9eedXqbN2dHx NSVvZrKIUbUzOb+X+BbakWVBz6UZ1Kx/C0/rObaX1UNihkzFU29ks+XhDgSwbyQj9CPIu0PFG8X E5TnLJJ3EmsYIPtLKyAOdATwL9TvUiMp0SKZopIFS8hfzezffzrnTk/JbDwpVQeFXcwfu1or9YE tl4Q3ZC9Hm8+sA/W7GdZzph1bc/T2ax57ZULrKHC7WXK98m//O+hPDsbd9sa2Pr5FhXr4jEcsOO +bK5mJHT X-Proofpoint-GUID: CdX3HjNLwP04d5nmmPWDZ5BEFXap9oMA X-Proofpoint-ORIG-GUID: CdX3HjNLwP04d5nmmPWDZ5BEFXap9oMA 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=2025-08-28_02,2025-08-28_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 priorityscore=1501 malwarescore=0 phishscore=0 clxscore=1015 suspectscore=0 impostorscore=0 adultscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2507300000 definitions=main-2508230033 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 ca96c3e66d683d6c1d1215b1b48d2f7b7f58d5b0..b744354b47c861370a247e1a6ce88563aa01c4aa 100644 --- a/drivers/hwtracing/coresight/coresight-tnoc.c +++ b/drivers/hwtracing/coresight/coresight-tnoc.c @@ -300,6 +300,28 @@ 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" }, {} @@ -313,6 +335,7 @@ 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