On 23/08/2022 17:56, Tharun Kumar P wrote:
> Microchip PCI1XXXX is an unmanaged PCIe3.1a Switch for Consumer,
> Industrial and Automotive applications. This switch has multiple
> downstream ports. In one of the Switch's Downstream port, there
> is a multifunction endpoint for peripherals which includes an I2C
> host controller. The I2C function in the endpoint operates at 100KHz,
> 400KHz and 1 MHz and has buffer depth of 128 bytes.
> This patch provides the I2C controller driver for the I2C endpoint
> of the switch.
(...)
> +static int pci1xxxx_i2c_suspend(struct device *dev)
> +{
> + struct pci1xxxx_i2c *i2c = dev_get_drvdata(dev);
> + struct pci_dev *pdev = to_pci_dev(dev);
> + u32 regval;
> +
> + i2c_mark_adapter_suspended(&i2c->adap);
> +
> + while ((i2c->i2c_xfer_in_progress))
> + msleep(20);
> +
> + pci1xxxx_i2c_config_high_level_intr(i2c,
> + SMBALERT_WAKE_INTR_MASK,
> + true);
> +
> + /*Enable the PERST_DIS bit to mask the PERST from
> + *resetting the core regs
> + */
Use Linux coding style comments. Everywhere...
(...)
> +
> +static int pci1xxxx_i2c_probe_pci(struct pci_dev *pdev,
> + const struct pci_device_id *ent)
> +{
> + struct pci1xxxx_i2c *i2c;
> + int ret;
> +
> + i2c = devm_kzalloc(&pdev->dev, sizeof(*i2c), GFP_KERNEL);
> + if (!i2c)
> + return -ENOMEM;
> +
> + pci_set_drvdata(pdev, i2c);
> +
> + i2c->i2c_xfer_in_progress = false;
> +
> + ret = pcim_enable_device(pdev);
> + if (ret)
> + return ret;
> +
> + pci_set_master(pdev);
> +
> + /* we are getting the base address of the SMB core. SMB core uses
> + * BAR0 and 32K is the size here pci_resource_len returns 32K by
> + * reading BAR0
> + */
> +
> + ret = pcim_iomap_regions(pdev, BIT(0), pci_name(pdev));
> + if (ret < 0)
> + return -ENOMEM;
> +
> + i2c->i2c_base = pcim_iomap_table(pdev)[0];
> +
> + init_completion(&i2c->i2c_xfer_done);
> +
> + pci1xxxx_i2c_init(i2c);
> +
> + dev_info(&pdev->dev, "i2c clock freq: %d\n", i2c->freq);
That's not a helpful print. Don't pollute dmesg.
> +
> + ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
> + if (ret < 0)
> + return ret;
> +
> + /*Register the isr. we are not using any isr flags here.*/
Use Linux coding style comments. Everywhere...
> + ret = devm_request_irq(&pdev->dev, pci_irq_vector(pdev, 0),
> + pci1xxxx_i2c_isr, PCI1XXXX_IRQ_FLAGS,
> + pci_name(pdev), i2c);
> + if (ret)
> + goto err_free_region;
> +
> + i2c->adap = pci1xxxx_i2c_ops;
> + i2c->adap.class = I2C_CLASS_SPD;
> + i2c->adap.dev.parent = &pdev->dev;
> +
> + snprintf(i2c->adap.name, sizeof(i2c->adap.name),
> + "MCHP PCI1xxxx i2c adapter at %s", pci_name(pdev));
> +
> + i2c_set_adapdata(&i2c->adap, i2c);
> +
> + ret = i2c_add_adapter(&i2c->adap);
> + if (ret) {
> + dev_err(&pdev->dev, "i2c add adapter failed = %d\n", ret);
> + pci1xxxx_i2c_shutdown(i2c);
Why do you call here pci1xxxx_i2c_shutdown() but not in previous error path?
> + goto err_free_region;
> + }
> +
> + return 0;
> +
> +err_free_region:
> + pci_free_irq_vectors(pdev);
> + return ret;
> +}
> +
> +static void pci1xxxx_i2c_remove_pci(struct pci_dev *pdev)
> +{
> + struct pci1xxxx_i2c *i2c = pci_get_drvdata(pdev);
No need for pci_free_irq_vectors()?
> +
> + i2c_del_adapter(&i2c->adap);
> + pci1xxxx_i2c_shutdown(i2c);
> +}
> +
Best regards,
Krzysztof
