netdev - Re: [PATCH] net/macb: fix ISR clear-on-write behavior only for some SoC

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Date:	Tue, 14 May 2013 07:52:56 +0200
From:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
To:	Hein Tibosch <hein_tibosch@...oo.es>
Cc:	Nicolas Ferre <nicolas.ferre@...el.com>, michal.simek@...inx.com,
	Ludovic Desroches <ludovic.desroches@...el.com>,
	s.trumtrar@...gutronix.de, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] net/macb: fix ISR clear-on-write behavior only for
 some SoC

On 08:58 Tue 14 May     , Hein Tibosch wrote:
> On 5/14/2013 12:05 AM, Jean-Christophe PLAGNIOL-VILLARD wrote:
> > On May 14, 2013, at 12:05 AM, Nicolas Ferre <nicolas.ferre@...el.com> wrote:
> >
> >> Commit 749a2b6 (net/macb: clear tx/rx completion flags in ISR)
> >> introduces clear-on-write on ISR register. This behavior is not always
> >> implemented when using Cadence MACB/GEM and is breaking other platforms.
> >> We are using a new Device Tree compatibility string and a capability
> >> property to actually activate this clear-on-write behavior on ISR.
> >>
> >> Reported-by: Hein Tibosch <hein_tibosch@...oo.es>
> >> Signed-off-by: Nicolas Ferre <nicolas.ferre@...el.com>
> > can we detect it via the IP?
> 
> This was my first proposal, have it based on the value of MACB's
> register 'MID' (offset 0x00fc, lower 16 bits).
> On avr32 it reads: 0x0000010D, on Zynq it reports 0x00000119
> 
> So for the moment, CAPS_ISR_CLEAR_ON_WRITE could be set if the revision
> equals to 0x00000119?
so no it will not work

as the gem on sama5 is 00020119

so version 0x119 too

nico 
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>

Best Regards,
J.
> 
> >> ---
> >> Documentation/devicetree/bindings/net/macb.txt |  2 ++
> >> drivers/net/ethernet/cadence/macb.c            | 15 +++++++++++++--
> >> drivers/net/ethernet/cadence/macb.h            |  5 +++++
> >> 3 files changed, 20 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/Documentation/devicetree/bindings/net/macb.txt b/Documentation/devicetree/bindings/net/macb.txt
> >> index 44afa0e..13ec4f6 100644
> >>
> >> <snip>
> >>
> >> @@ -1474,6 +1476,10 @@ static const struct of_device_id macb_dt_ids[] = {
> >> 	{ .compatible = "cdns,macb" },
> >> 	{ .compatible = "cdns,pc302-gem" },
> >> 	{ .compatible = "cdns,gem" },
> >> +	{
> >> +		.compatible = "cdns,zynq-7000-gem",
> >> +		.data = (void *)MACB_CAPS_ISR_CLEAR_ON_WRITE,
> >> +	},
> >> 	{ /* sentinel */ }
> >> };
> >> MODULE_DEVICE_TABLE(of, macb_dt_ids);
> >> @@ -1484,6 +1490,7 @@ static int __init macb_probe(struct platform_device *pdev)
> >> 	struct macb_platform_data *pdata;
> >> 	struct resource *regs;
> >> 	struct net_device *dev;
> >> +	const struct of_device_id *dev_id;
> >> 	struct macb *bp;
> >> 	struct phy_device *phydev;
> >> 	u32 config;
> >> @@ -1558,6 +1565,10 @@ static int __init macb_probe(struct platform_device *pdev)
> >>
> >> 	dev->base_addr = regs->start;
> >>
> >> +	dev_id = of_match_device(macb_dt_ids, &pdev->dev);
> As avr32 doesn't yet define CONFIG_OF:
>     macb.c:1601: error:  'macb_dt_ids' undeclared
> 
> Hein
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