linux-kernel - Re: [PATCH v2 1/2] pci: altera: Add Stratix10 PCIe support

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Message-ID: <20181231151730.GD159477@google.com>
Date:   Mon, 31 Dec 2018 09:17:30 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Ley Foon Tan <ley.foon.tan@...el.com>
Cc:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        lftan.linux@...il.com
Subject: Re: [PATCH v2 1/2] pci: altera: Add Stratix10 PCIe support

Run "git log --oneline --follow drivers/pci/controller/pcie-altera.c" and
make your subject line match in style, phrasing, and capitalization.

Hint:

  ............ pci: altera: Add Stratix10 PCIe support
  ef75369a5b9a PCI: altera: Fix platform_get_irq() error handling
  bfdbbf0e3c2a PCI: altera: Use size=4 IRQ domain for legacy INTx
  6ab380957838 PCI: altera: Drop pci_fixup_irqs()
  9815791319a0 PCI: altera: Convert PCI scan API to pci_scan_root_bus_bridge()
  2a7275a3d867 PCI: altera: Fix TLP_CFG_DW0 for TLP write

One of these is not like the others.

On Mon, Dec 31, 2018 at 04:24:52PM +0800, Ley Foon Tan wrote:
...
> +struct altera_pcie_data {
> +	int (*tlp_read_pkt)(struct altera_pcie *pcie, u32 *value);
> +	void (*tlp_write_pkt)(struct altera_pcie *pcie, u32 *headers,
> +			      u32 data, bool align);
> +	bool (*get_link_status)(struct altera_pcie *pcie);
> +	int (*rp_read_cfg)(struct altera_pcie *pcie, int where,
> +			   int size, u32 *value);
> +	int (*rp_write_cfg)(struct altera_pcie *pcie, u8 bus, int where,
> +			    int size, u32 value);
> +	bool s10_flag;		/* Stratix 10 */

This is OK if you only ever have two programming models (the original
and Stratix 10).  But if there's a possibility of more, an int model
type that can be tested with a switch is more extensible.

Personally I prefer bitfields over bool in structures, but ultimately
Lorenzo will take this and I don't know whether he has a preference.

https://lkml.kernel.org/r/CA+55aFxnePDimkVKVtv3gNmRGcwc8KQ5mHYvUxY8sAQg6yvVYg@mail.gmail.com
https://lkml.kernel.org/r/CA+55aFzKQ6Pj18TB8p4Yr0M4t+S+BsiHH=BJNmn=76-NcjTj-g@mail.gmail.com

Bjorn