From: Mark Rutland <mark.rutland@arm.com>
To: Chen Baozi <cbz@baozis.org>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>
Subject: Re: [PATCH 3/3] stmmac: Add AXI burst length support to platform device.
Date: Mon, 9 Feb 2015 12:04:43 +0000 [thread overview]
Message-ID: <20150209120443.GF4250@leverpostej> (raw)
In-Reply-To: <1423285636-8623-4-git-send-email-cbz@baozis.org>
On Sat, Feb 07, 2015 at 05:07:16AM +0000, Chen Baozi wrote:
> The AXI Bus Mode Register controls the AXI master behavior. It is mainly
> used to control the burst splitting and the number of outstanding requests.
> This register is present and valid only in GMAC-AXI configuration. The old
> driver only supports this feature on PCI devices. This patch adds an
> 'snps,apl' properties in DT to enable it on platform devices.
>
> Signed-off-by: Chen Baozi <chenbaozi@kylinos.com.cn>
> ---
> Documentation/devicetree/bindings/net/stmmac.txt | 1 +
> drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 1 +
> 2 files changed, 2 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/net/stmmac.txt b/Documentation/devicetree/bindings/net/stmmac.txt
> index c41afd9..8f3c834 100644
> --- a/Documentation/devicetree/bindings/net/stmmac.txt
> +++ b/Documentation/devicetree/bindings/net/stmmac.txt
> @@ -43,6 +43,7 @@ Optional properties:
> available this clock is used for programming the Timestamp Addend Register.
> If not passed then the system clock will be used and this is fine on some
> platforms.
> +- snps,abl: AXI Burst Length
This is not a good name (though I see it follows "snps,pbl", which is
also not a good name)...
Why does this need to be in the DT? Is this required for correctness? Or
performance?
Thanks,
Mark.
>
> Examples:
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> index 3039de2..abbc897 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> @@ -230,6 +230,7 @@ static int stmmac_probe_config_dt(struct platform_device *pdev,
> return -ENOMEM;
> plat->dma_cfg = dma_cfg;
> of_property_read_u32(np, "snps,pbl", &dma_cfg->pbl);
> + of_property_read_u32(np, "snps,abl", &dma_cfg->burst_len);
> dma_cfg->fixed_burst =
> of_property_read_bool(np, "snps,fixed-burst");
> dma_cfg->mixed_burst =
> --
> 2.1.4
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>
next prev parent reply other threads:[~2015-02-09 12:04 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1423285636-8623-1-git-send-email-cbz@baozis.org>
2015-02-07 5:07 ` [PATCH 3/3] stmmac: Add AXI burst length support to platform device Chen Baozi
2015-02-09 12:04 ` Mark Rutland [this message]
2015-02-10 0:02 ` Chen Baozi
[not found] <20150210020734.GE7920@cbz-thinkpad>
[not found] ` <20150210114837.GC6659@leverpostej>
2015-02-11 11:11 ` Chen Baozi
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