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NVIDIA: SAUCE: i2c: tegra: resume explicitly if pm_runtime is disabled

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BugLink: https://bugs.launchpad.net/bugs/2080908

This is a WAR to handle NOIRQ suspend/resume in I2C client devices.
runtime_pm is disabled during system suspend and enabled on resume.
Some client devices trigger I2C transfers before the I2C driver has
resumed completely which causes the I2C transfers to fail. Do
runtime_resume explicitly then so that I2C can work.

http://nvbugs/4765610

Signed-off-by: Akhil R <akhilrajeev@nvidia.com>
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Acked-by: Noah Wager <noah.wager@canonical.com>
Acked-by: Jacob Martin <jacob.martin@canonical.com>
Signed-off-by: Noah Wager <noah.wager@canonical.com>
This commit is contained in:
Akhil R
2024-08-09 10:37:13 +05:30
committed by Noah Wager
parent 72a38fe889
commit eaea3c248f
1 changed files with 15 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/i2c/busses/i2c-tegra.c
+15 -3
View File
@@ -313,6 +313,9 @@ static u32 dvc_readl(struct tegra_i2c_dev *i2c_dev, unsigned int reg)
return readl_relaxed(i2c_dev->base + reg);
}
static int tegra_i2c_runtime_resume(struct device *dev);
static int tegra_i2c_runtime_suspend(struct device *dev);
/*
* If necessary, i2c_writel() and i2c_readl() will offset the register
* in order to talk to the I2C block inside the DVC block.
@@ -1427,10 +1430,16 @@ static int tegra_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[],
struct tegra_i2c_dev *i2c_dev = i2c_get_adapdata(adap);
int i, ret;
ret = pm_runtime_get_sync(i2c_dev->dev);
if (pm_runtime_enabled(i2c_dev->dev))
ret = pm_runtime_get_sync(i2c_dev->dev);
else
ret = tegra_i2c_runtime_resume(i2c_dev->dev);
if (ret < 0) {
if (pm_runtime_enabled(i2c_dev->dev))
pm_runtime_put_noidle(i2c_dev->dev);
dev_err(i2c_dev->dev, "runtime resume failed %d\n", ret);
pm_runtime_put_noidle(i2c_dev->dev);
return ret;
}
@@ -1458,7 +1467,10 @@ static int tegra_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[],
break;
}
pm_runtime_put(i2c_dev->dev);
if (pm_runtime_enabled(i2c_dev->dev))
pm_runtime_put(i2c_dev->dev);
else
tegra_i2c_runtime_suspend(i2c_dev->dev);
return ret ?: i;
}