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Tue, 19 Nov 2024 14:30:53 +0000 Received: from APBLRPPMTA01.qualcomm.com (APBLRPPMTA01.qualcomm.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 4AJEUrOp010741; Tue, 19 Nov 2024 14:30:53 GMT Received: from hu-maiyas-hyd.qualcomm.com (hu-msavaliy-hyd.qualcomm.com [10.213.110.207]) by APBLRPPMTA01.qualcomm.com (PPS) with ESMTPS id 4AJEUrWm010739 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 19 Nov 2024 14:30:53 +0000 Received: by hu-maiyas-hyd.qualcomm.com (Postfix, from userid 429934) id 1B5EA24060; Tue, 19 Nov 2024 20:00:52 +0530 (+0530) From: Mukesh Kumar Savaliya To: andi.shyti@kernel.org, quic_bjorande@quicinc.com, linux-arm-msm@vger.kernel.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, --cc=konrad.dybcio@linaro.org, quic_vdadhani@quicinc.com, vkoul@kernel.org Cc: Mukesh Kumar Savaliya Subject: [PATCH v3] i2c: i2c-qcom-geni: Serve transfer during early resume stage Date: Tue, 19 Nov 2024 20:00:31 +0530 Message-Id: <20241119143031.3331753-1-quic_msavaliy@quicinc.com> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-QCInternal: smtphost X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: 1XYFHjsaLiahucoNLglRV-Y8FQPu3Jld X-Proofpoint-GUID: 1XYFHjsaLiahucoNLglRV-Y8FQPu3Jld X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-06_09,2024-09-06_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 spamscore=0 mlxlogscore=999 clxscore=1015 suspectscore=0 adultscore=0 priorityscore=1501 phishscore=0 impostorscore=0 bulkscore=0 lowpriorityscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2409260000 definitions=main-2411190106 pm_runtime_get_sync() function fails during PM early resume and returns -EACCES because runtime PM for the device is disabled at the early stage causing i2c transfer to fail. Make changes to serve transfer with forced resume. Few i2c clients like PCI OR touch may request i2c transfers during early resume stage. Any i2c client can keep transfer request very early resume stage like noirq phase of PM. To serve the transfer, register an interrupt with IRQF_EARLY_RESUME and IRQF_NO_SUSPEND flags to avoid timeout of transfer when IRQ is not enabled during early stage. pm_runtime_get_sync() fails when runtime PM is not enabled, then use pm_runtime_force_resume() and serve the transfer. Co-developed-by: Viken Dadhaniya Signed-off-by: Viken Dadhaniya Signed-off-by: Mukesh Kumar Savaliya --- Link to V2: https://lore.kernel.org/lkml/202410132233.P25W2vKq-lkp@intel.com/T/ v2 -> v3: - Updated exact usecase and scenario in the commit log description. - Removed bulleted points from technical description, added details in free flow. - Used pm_runtime_force_resume/suspend() instead customized local implementation. - Added debug log after pm_runtime_force_suspend(). --- Link to V1: https://patches.linaro.org/project/linux-i2c/patch/20240328123743.1713696-1-quic_msavaliy@quicinc.com/ v1 -> v2: - Changed gi2c->se.dev to dev during dev_dbg() calls. - Addressed review comments from Andi and Bjorn. - Returned 0 instead garbage inside geni_i2c_force_resume(). - Added comments explaining forced resume transfer when runtime PM remains disabled. --- drivers/i2c/busses/i2c-qcom-geni.c | 43 +++++++++++++++++++++--------- 1 file changed, 31 insertions(+), 12 deletions(-) diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c index 7a22e1f46e60..4fe5fa4532ca 100644 --- a/drivers/i2c/busses/i2c-qcom-geni.c +++ b/drivers/i2c/busses/i2c-qcom-geni.c @@ -695,17 +695,27 @@ static int geni_i2c_xfer(struct i2c_adapter *adap, int num) { struct geni_i2c_dev *gi2c = i2c_get_adapdata(adap); + struct device *dev = gi2c->se.dev; int ret; gi2c->err = 0; reinit_completion(&gi2c->done); - ret = pm_runtime_get_sync(gi2c->se.dev); - if (ret < 0) { - dev_err(gi2c->se.dev, "error turning SE resources:%d\n", ret); - pm_runtime_put_noidle(gi2c->se.dev); - /* Set device in suspended since resume failed */ - pm_runtime_set_suspended(gi2c->se.dev); - return ret; + /* Serve I2C transfer by forced resume if Runtime PM is enbled or not */ + if (!pm_runtime_enabled(dev) && gi2c->suspended) { + dev_dbg(dev, "Runtime PM is disabled hence force resume, pm_usage_count: %d\n", + atomic_read(&dev->power.usage_count)); + ret = pm_runtime_force_resume(dev); + if (ret) + return ret; + } else { + ret = pm_runtime_get_sync(gi2c->se.dev); + if (ret < 0) { + dev_err(gi2c->se.dev, "error turning SE resources:%d\n", ret); + pm_runtime_put_noidle(gi2c->se.dev); + /* Set device in suspended since resume failed */ + pm_runtime_set_suspended(gi2c->se.dev); + return ret; + } } qcom_geni_i2c_conf(gi2c); @@ -715,8 +725,18 @@ static int geni_i2c_xfer(struct i2c_adapter *adap, else ret = geni_i2c_fifo_xfer(gi2c, msgs, num); - pm_runtime_mark_last_busy(gi2c->se.dev); - pm_runtime_put_autosuspend(gi2c->se.dev); + /* if Runtime PM is disabled, do force_suspend() else autosuspend the driver */ + if (!pm_runtime_enabled(dev) && !gi2c->suspended) { + ret = pm_runtime_force_suspend(dev); + dev_dbg(dev, "Runtime PM is disabled hence force suspend, pm_usage_count: %d\n", + atomic_read(&dev->power.usage_count)); + if (ret) + return ret; + } else { + pm_runtime_mark_last_busy(gi2c->se.dev); + pm_runtime_put_autosuspend(gi2c->se.dev); + } + gi2c->cur = NULL; gi2c->err = 0; return ret; @@ -833,9 +853,8 @@ static int geni_i2c_probe(struct platform_device *pdev) init_completion(&gi2c->done); spin_lock_init(&gi2c->lock); platform_set_drvdata(pdev, gi2c); - - /* Keep interrupts disabled initially to allow for low-power modes */ - ret = devm_request_irq(dev, gi2c->irq, geni_i2c_irq, IRQF_NO_AUTOEN, + ret = devm_request_irq(dev, gi2c->irq, geni_i2c_irq, + IRQF_NO_AUTOEN | IRQF_EARLY_RESUME | IRQF_NO_SUSPEND, dev_name(dev), gi2c); if (ret) { dev_err(dev, "Request_irq failed:%d: err:%d\n",