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[216.228.112.21]) by smtp.gmail.com with ESMTPSA id z7sm10513791pgh.81.2019.05.17.09.39.49 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 17 May 2019 09:39:49 -0700 (PDT) From: Ajay Gupta X-Google-Original-From: Ajay Gupta To: heikki.krogerus@linux.intel.com Cc: linux-usb@vger.kernel.org, linux-i2c@vger.kernel.org, Ajay Gupta Subject: [PATCH 1/4] i2c: nvidia-gpu: add runtime pm support Date: Fri, 17 May 2019 09:38:15 -0700 Message-Id: <20190517163818.5007-2-ajayg@nvidia.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190517163818.5007-1-ajayg@nvidia.com> References: <20190517163818.5007-1-ajayg@nvidia.com> X-NVConfidentiality: public Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org From: Ajay Gupta Enable runtime pm support with autosuspend delay of three second. This is to make sure I2C client device Cypress CCGx has completed all transaction. Signed-off-by: Ajay Gupta --- drivers/i2c/busses/i2c-nvidia-gpu.c | 24 +++++++++++++++++++++--- 1 file changed, 21 insertions(+), 3 deletions(-) diff --git a/drivers/i2c/busses/i2c-nvidia-gpu.c b/drivers/i2c/busses/i2c-nvidia-gpu.c index 1c8f708f212b..9d347583f8dc 100644 --- a/drivers/i2c/busses/i2c-nvidia-gpu.c +++ b/drivers/i2c/busses/i2c-nvidia-gpu.c @@ -175,6 +175,7 @@ static int gpu_i2c_master_xfer(struct i2c_adapter *adap, * The controller supports maximum 4 byte read due to known * limitation of sending STOP after every read. */ + pm_runtime_get_sync(i2cd->dev); for (i = 0; i < num; i++) { if (msgs[i].flags & I2C_M_RD) { /* program client address before starting read */ @@ -189,7 +190,7 @@ static int gpu_i2c_master_xfer(struct i2c_adapter *adap, status = gpu_i2c_start(i2cd); if (status < 0) { if (i == 0) - return status; + goto exit; goto stop; } @@ -206,13 +207,18 @@ static int gpu_i2c_master_xfer(struct i2c_adapter *adap, } status = gpu_i2c_stop(i2cd); if (status < 0) - return status; + goto exit; + pm_runtime_mark_last_busy(i2cd->dev); + pm_runtime_put_autosuspend(i2cd->dev); return i; stop: status2 = gpu_i2c_stop(i2cd); if (status2 < 0) dev_err(i2cd->dev, "i2c stop failed %d\n", status2); +exit: + pm_runtime_mark_last_busy(i2cd->dev); + pm_runtime_put_autosuspend(i2cd->dev); return status; } @@ -332,6 +338,11 @@ static int gpu_i2c_probe(struct pci_dev *pdev, const struct pci_device_id *id) goto del_adapter; } + pm_runtime_set_autosuspend_delay(&pdev->dev, 3000); + pm_runtime_use_autosuspend(&pdev->dev); + pm_runtime_put_autosuspend(&pdev->dev); + pm_runtime_allow(&pdev->dev); + return 0; del_adapter: @@ -345,10 +356,16 @@ static void gpu_i2c_remove(struct pci_dev *pdev) { struct gpu_i2c_dev *i2cd = dev_get_drvdata(&pdev->dev); + pm_runtime_get_noresume(i2cd->dev); i2c_del_adapter(&i2cd->adapter); pci_free_irq_vectors(pdev); } +static int gpu_i2c_suspend(struct device *dev) +{ + return 0; +} + static __maybe_unused int gpu_i2c_resume(struct device *dev) { struct gpu_i2c_dev *i2cd = dev_get_drvdata(dev); @@ -357,7 +374,8 @@ static __maybe_unused int gpu_i2c_resume(struct device *dev) return 0; } -static UNIVERSAL_DEV_PM_OPS(gpu_i2c_driver_pm, NULL, gpu_i2c_resume, NULL); +static UNIVERSAL_DEV_PM_OPS(gpu_i2c_driver_pm, gpu_i2c_suspend, gpu_i2c_resume, + NULL); static struct pci_driver gpu_i2c_driver = { .name = "nvidia-gpu", -- 2.17.1