linux-kernel - Re: [PATCH v2] PCI: thunder-pem: Add support for cn81xx and cn83xx SoCs.

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Message-ID: <20170112220219.GG8312@bhelgaas-glaptop.roam.corp.google.com>
Date:   Thu, 12 Jan 2017 16:02:19 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     David Daney <ddaney.cavm@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-arm-kernel@...ts.infradead.org,
        David Daney <david.daney@...ium.com>
Subject: Re: [PATCH v2] PCI: thunder-pem: Add support for cn81xx and cn83xx
 SoCs.

On Wed, Jan 11, 2017 at 11:22:11AM -0800, David Daney wrote:
> From: David Daney <david.daney@...ium.com>
> 
> The pci-thunder-pem driver was initially developed for cn88xx SoCs.
> The cn81xx and cn83xx members of the same family of SoCs has a
> slightly different configuration of interrupt resources in the PEM
> hardware, which prevents the INTA legacy interrupt source from
> functioning with the current driver.
> 
> There are two fixes required:
> 
> 1) Don't fixup the PME interrupt on the newer SoCs as it already has
> the proper value.
> 
> 2) Report MSI-X Capability Table Size of 2 for the newer SoCs, so the
> core MSI-X code doesn't inadvertently clobber the INTA machinery that
> happens to reside immediately following the table.
> 
> Signed-off-by: David Daney <david.daney@...ium.com>

Applied to pci/host-thunder for v4.11, thanks!

> ---
> 
> Changes from v1: Fixed comment typo.
> 
>  drivers/pci/host/pci-thunder-pem.c | 25 ++++++++++++++++++++-----
>  1 file changed, 20 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/pci/host/pci-thunder-pem.c b/drivers/pci/host/pci-thunder-pem.c
> index af722eb..52b5bdc 100644
> --- a/drivers/pci/host/pci-thunder-pem.c
> +++ b/drivers/pci/host/pci-thunder-pem.c
> @@ -36,7 +36,7 @@ struct thunder_pem_pci {
>  static int thunder_pem_bridge_read(struct pci_bus *bus, unsigned int devfn,
>  				   int where, int size, u32 *val)
>  {
> -	u64 read_val;
> +	u64 read_val, tmp_val;
>  	struct pci_config_window *cfg = bus->sysdata;
>  	struct thunder_pem_pci *pem_pci = (struct thunder_pem_pci *)cfg->priv;
>  
> @@ -65,13 +65,28 @@ static int thunder_pem_bridge_read(struct pci_bus *bus, unsigned int devfn,
>  		read_val |= 0x00007000; /* Skip MSI CAP */
>  		break;
>  	case 0x70: /* Express Cap */
> -		/* PME interrupt on vector 2*/
> -		read_val |= (2u << 25);
> +		/*
> +		 * Change PME interrupt to vector 2 on T88 where it
> +		 * reads as 0, else leave it alone.
> +		 */
> +		if (!(read_val & (0x1f << 25)))
> +			read_val |= (2u << 25);
>  		break;
>  	case 0xb0: /* MSI-X Cap */
> -		/* TableSize=4, Next Cap is EA */
> +		/* TableSize=2 or 4, Next Cap is EA */
>  		read_val &= 0xc00000ff;
> -		read_val |= 0x0003bc00;
> +		/*
> +		 * If Express Cap(0x70) raw PME vector reads as 0 we are on
> +		 * T88 and TableSize is reported as 4, else TableSize
> +		 * is 2.
> +		 */
> +		writeq(0x70, pem_pci->pem_reg_base + PEM_CFG_RD);
> +		tmp_val = readq(pem_pci->pem_reg_base + PEM_CFG_RD);
> +		tmp_val >>= 32;
> +		if (!(tmp_val & (0x1f << 25)))
> +			read_val |= 0x0003bc00;
> +		else
> +			read_val |= 0x0001bc00;
>  		break;
>  	case 0xb4:
>  		/* Table offset=0, BIR=0 */
> -- 
> 2.9.3
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

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