[PATCH v8 14/32] i2c: tegra: Clean up probe function

Dmitry Osipenko
2020-09-22T22:54:21Z

The driver's probe function code is a bit difficult to read. This patch
reorders code of the probe function, forming groups of code that are easy
to work with. The probe tear-down order now matches the driver-removal
order.

Reviewed-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
drivers/i2c/busses/i2c-tegra.c | 100 ++++++++++++++++-----------------
1 file changed, 49 insertions(+), 51 deletions(-)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 9486fcba655c..56981a5506ae 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -440,6 +440,9 @@ static int tegra_i2c_init_dma(struct tegra_i2c_dev *i2c_dev)

i2c_dev->tx_dma_chan = chan;

+ i2c_dev->dma_buf_size = i2c_dev->hw->quirks->max_write_len +
+ I2C_PACKET_HEADER_SIZE;
+
dma_buf = dma_alloc_coherent(i2c_dev->dev, i2c_dev->dma_buf_size,
&dma_phys, GFP_KERNEL | __GFP_NOWARN);
if (!dma_buf) {
@@ -1694,34 +1697,42 @@ static int tegra_i2c_probe(struct platform_device *pdev)
struct device *dev = &pdev->dev;
struct tegra_i2c_dev *i2c_dev;
struct resource *res;
- void __iomem *base;
- phys_addr_t base_phys;
- int irq;
int ret;

- base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
- if (IS_ERR(base))
- return PTR_ERR(base);
-
- base_phys = res->start;
-
- irq = platform_get_irq(pdev, 0);
- if (irq < 0)
- return irq;
-
i2c_dev = devm_kzalloc(&pdev->dev, sizeof(*i2c_dev), GFP_KERNEL);
if (!i2c_dev)
return -ENOMEM;

- i2c_dev->base = base;
- i2c_dev->base_phys = base_phys;
- i2c_dev->adapter.algo = &tegra_i2c_algo;
- i2c_dev->adapter.retries = 1;
- i2c_dev->adapter.timeout = 6 * HZ;
- i2c_dev->irq = irq;
+ platform_set_drvdata(pdev, i2c_dev);
+
+ init_completion(&i2c_dev->msg_complete);
+ init_completion(&i2c_dev->dma_complete);
+
+ i2c_dev->hw = of_device_get_match_data(&pdev->dev);
i2c_dev->cont_id = pdev->id;
i2c_dev->dev = &pdev->dev;

+ i2c_dev->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
+ if (IS_ERR(i2c_dev->base))
+ return PTR_ERR(i2c_dev->base);
+
+ i2c_dev->base_phys = res->start;
+
+ ret = platform_get_irq(pdev, 0);
+ if (ret < 0)
+ return ret;
+
+ i2c_dev->irq = ret;
+
+ /* interrupt will be enabled during of transfer time */
+ irq_set_status_flags(i2c_dev->irq, IRQ_NOAUTOEN);
+
+ ret = devm_request_irq(&pdev->dev, i2c_dev->irq, tegra_i2c_isr,
+ IRQF_NO_SUSPEND, dev_name(&pdev->dev),
+ i2c_dev);
+ if (ret)
+ return ret;
+
i2c_dev->rst = devm_reset_control_get_exclusive(&pdev->dev, "i2c");
if (IS_ERR(i2c_dev->rst)) {
dev_err_probe(&pdev->dev, PTR_ERR(i2c_dev->rst),
@@ -1735,14 +1746,9 @@ static int tegra_i2c_probe(struct platform_device *pdev)
if (ret)
return ret;

- i2c_dev->hw = of_device_get_match_data(&pdev->dev);
- i2c_dev->adapter.quirks = i2c_dev->hw->quirks;
- i2c_dev->dma_buf_size = i2c_dev->adapter.quirks->max_write_len +
- I2C_PACKET_HEADER_SIZE;
- init_completion(&i2c_dev->msg_complete);
- init_completion(&i2c_dev->dma_complete);
-
- platform_set_drvdata(pdev, i2c_dev);
+ ret = tegra_i2c_init_dma(i2c_dev);
+ if (ret)
+ goto release_clocks;

/*
* VI I2C is in VE power domain which is not always on and not
@@ -1760,49 +1766,41 @@ static int tegra_i2c_probe(struct platform_device *pdev)
goto put_rpm;
}

- if (i2c_dev->hw->supports_bus_clear)
- i2c_dev->adapter.bus_recovery_info = &tegra_i2c_recovery_info;
-
- ret = tegra_i2c_init_dma(i2c_dev);
- if (ret < 0)
- goto put_rpm;
-
ret = tegra_i2c_init(i2c_dev);
- if (ret) {
- dev_err(&pdev->dev, "Failed to initialize i2c controller\n");
- goto release_dma;
- }
-
- irq_set_status_flags(i2c_dev->irq, IRQ_NOAUTOEN);
-
- ret = devm_request_irq(&pdev->dev, i2c_dev->irq, tegra_i2c_isr,
- IRQF_NO_SUSPEND, dev_name(&pdev->dev), i2c_dev);
if (ret)
- goto release_dma;
+ goto put_rpm;

i2c_set_adapdata(&i2c_dev->adapter, i2c_dev);
+ i2c_dev->adapter.dev.of_node = pdev->dev.of_node;
+ i2c_dev->adapter.dev.parent = &pdev->dev;
+ i2c_dev->adapter.retries = 1;
+ i2c_dev->adapter.timeout = 6 * HZ;
+ i2c_dev->adapter.quirks = i2c_dev->hw->quirks;
i2c_dev->adapter.owner = THIS_MODULE;
i2c_dev->adapter.class = I2C_CLASS_DEPRECATED;
+ i2c_dev->adapter.algo = &tegra_i2c_algo;
+ i2c_dev->adapter.nr = pdev->id;
+
+ if (i2c_dev->hw->supports_bus_clear)
+ i2c_dev->adapter.bus_recovery_info = &tegra_i2c_recovery_info;
+
strlcpy(i2c_dev->adapter.name, dev_name(&pdev->dev),
sizeof(i2c_dev->adapter.name));
- i2c_dev->adapter.dev.parent = &pdev->dev;
- i2c_dev->adapter.nr = pdev->id;
- i2c_dev->adapter.dev.of_node = pdev->dev.of_node;

ret = i2c_add_numbered_adapter(&i2c_dev->adapter);
if (ret)
- goto release_dma;
+ goto put_rpm;

pm_runtime_put(&pdev->dev);

return 0;

-release_dma:
- tegra_i2c_release_dma(i2c_dev);
-
put_rpm:
pm_runtime_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
+
+ tegra_i2c_release_dma(i2c_dev);
+release_clocks:
tegra_i2c_release_clocks(i2c_dev);

return ret;
--
2.27.0