From: Ajay Gupta <ajayg@xxxxxxxxxx>
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 <ajayg@xxxxxxxxxx>
---
Changes from v4->v5:
- Removed extra comments for gpu_i2c_suspend() based on
Wolfram's comment.
drivers/i2c/busses/i2c-nvidia-gpu.c | 22 +++++++++++++++++++++-
1 file changed, 21 insertions(+), 1 deletion(-)
diff --git a/drivers/i2c/busses/i2c-nvidia-gpu.c b/drivers/i2c/busses/i2c-nvidia-gpu.c
index 7678a460bf9a..364244ffb5bf 100644
--- a/drivers/i2c/busses/i2c-nvidia-gpu.c
+++ b/drivers/i2c/busses/i2c-nvidia-gpu.c
@@ -176,6 +176,7 @@ 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 */
@@ -217,6 +218,8 @@ static int gpu_i2c_master_xfer(struct i2c_adapter *adap,
if (status2 < 0)
dev_err(i2cd->dev, "i2c stop failed %d\n", status2);
}
+ pm_runtime_mark_last_busy(i2cd->dev);
+ pm_runtime_put_autosuspend(i2cd->dev);
return status;
}
@@ -336,6 +339,11 @@ 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:
@@ -349,10 +357,21 @@ 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);
}
+/*
+ * We need gpu_i2c_suspend() even if it is stub, for runtime pm to work
+ * correctly. Without it, lspci shows runtime pm status as "D0" for the card.
+ * Documentation/power/pci.txt also insists for driver to provide this.
+ */
+static __maybe_unused 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);
@@ -361,7 +380,8 @@ 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
