Re: [PATCH V2 2/9] PCI: Add TPH related register definition

[Bjorn Helgaas <helgaas@kernel.org>]

On Fri, May 31, 2024 at 04:38:34PM -0500, Wei Huang wrote:
> Linux has some basic, but incomplete, definition for the TPH Requester
> capability registers. Also the control registers of TPH Requester and
> the TPH Completer are missing. This patch adds all required definitions
> to support TPH enablement.

s/This patch adds/Add/

> +#define PCI_EXP_DEVCAP2_TPH_COMP_SHIFT		12
> +#define PCI_EXP_DEVCAP2_TPH_COMP_NONE		0x0 /* None */
> +#define PCI_EXP_DEVCAP2_TPH_COMP_TPH_ONLY	0x1 /* TPH only */
> +#define PCI_EXP_DEVCAP2_TPH_COMP_TPH_AND_EXT	0x3 /* TPH and Extended TPH */

Drop the _SHIFT definitions and use FIELD_GET() and FIELD_PREP()
instead.

>  /* TPH Requester */
>  #define PCI_TPH_CAP		4	/* capability register */
> +#define  PCI_TPH_CAP_NO_ST	0x1	/* no ST mode supported */
> +#define  PCI_TPH_CAP_NO_ST_SHIFT	0x0	/* no ST mode supported shift */

Drop _SHIFT and show full register width for PCI_TPH_CAP_NO_ST, e.g.,

  #define  PCI_TPH_CAP_NO_ST 0x00000001

The existing PCI_TPH_CAP_* definitions don't follow that convention,
but the rest of the file does, and this should match.