linux-kernel - Re: [PATCH V13 01/12] PCI: Add #defines for some of PCIe spec r4.0 features

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Message-ID: <20190710201433.GC35486@google.com>
Date:   Wed, 10 Jul 2019 15:14:34 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Vidya Sagar <vidyas@...dia.com>
Cc:     lorenzo.pieralisi@....com, robh+dt@...nel.org,
        mark.rutland@....com, thierry.reding@...il.com,
        jonathanh@...dia.com, kishon@...com, catalin.marinas@....com,
        will.deacon@....com, jingoohan1@...il.com,
        gustavo.pimentel@...opsys.com, digetx@...il.com,
        mperttunen@...dia.com, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        kthota@...dia.com, mmaddireddy@...dia.com, sagar.tv@...il.com
Subject: Re: [PATCH V13 01/12] PCI: Add #defines for some of PCIe spec r4.0
 features

On Wed, Jul 10, 2019 at 11:52:01AM +0530, Vidya Sagar wrote:
> Add #defines only for the Data Link Feature and Physical Layer 16.0 GT/s
> features as defined in PCIe spec r4.0, sec 7.7.4 for Data Link Feature and
> sec 7.7.5 for Physical Layer 16.0 GT/s.
> 
> Signed-off-by: Vidya Sagar <vidyas@...dia.com>
> Reviewed-by: Thierry Reding <treding@...dia.com>

Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>

Looks good, thanks!

> ---
> V13:
> * Updated commit message to include references from spec
> * Removed unused defines and moved some from pcie-tegra194.c file
> * Addressed review comments from Bjorn
> 
> V12:
> * None
> 
> V11:
> * None
> 
> V10:
> * None
> 
> V9:
> * None
> 
> V8:
> * None
> 
> V7:
> * None
> 
> V6:
> * None
> 
> V5:
> * None
> 
> V4:
> * None
> 
> V3:
> * Updated commit message and description to explicitly mention that defines are
>   added only for some of the features and not all.
> 
> V2:
> * None
> 
>  include/uapi/linux/pci_regs.h | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h
> index f28e562d7ca8..d28d0319d932 100644
> --- a/include/uapi/linux/pci_regs.h
> +++ b/include/uapi/linux/pci_regs.h
> @@ -713,7 +713,9 @@
>  #define PCI_EXT_CAP_ID_DPC	0x1D	/* Downstream Port Containment */
>  #define PCI_EXT_CAP_ID_L1SS	0x1E	/* L1 PM Substates */
>  #define PCI_EXT_CAP_ID_PTM	0x1F	/* Precision Time Measurement */
> -#define PCI_EXT_CAP_ID_MAX	PCI_EXT_CAP_ID_PTM
> +#define PCI_EXT_CAP_ID_DLF	0x25	/* Data Link Feature */
> +#define PCI_EXT_CAP_ID_PL_16GT	0x26	/* Physical Layer 16.0 GT/s */
> +#define PCI_EXT_CAP_ID_MAX	PCI_EXT_CAP_ID_PL_16GT
>  
>  #define PCI_EXT_CAP_DSN_SIZEOF	12
>  #define PCI_EXT_CAP_MCAST_ENDPOINT_SIZEOF 40
> @@ -1053,4 +1055,14 @@
>  #define  PCI_L1SS_CTL1_LTR_L12_TH_SCALE	0xe0000000  /* LTR_L1.2_THRESHOLD_Scale */
>  #define PCI_L1SS_CTL2		0x0c	/* Control 2 Register */
>  
> +/* Data Link Feature */
> +#define PCI_DLF_CAP		0x04	/* Capabilities Register */
> +#define  PCI_DLF_EXCHANGE_ENABLE	0x80000000  /* Data Link Feature Exchange Enable */
> +
> +/* Physical Layer 16.0 GT/s */
> +#define PCI_PL_16GT_LE_CTRL	0x20	/* Lane Equalization Control Register */
> +#define  PCI_PL_16GT_LE_CTRL_DSP_TX_PRESET_MASK		0x0000000F
> +#define  PCI_PL_16GT_LE_CTRL_USP_TX_PRESET_MASK		0x000000F0
> +#define  PCI_PL_16GT_LE_CTRL_USP_TX_PRESET_SHIFT	4
> +
>  #endif /* LINUX_PCI_REGS_H */
> -- 
> 2.17.1
>