linux-kernel - Re: [PATCH v2] mtd: nand: pxa3xx_nand: add register access debug

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Date:	Mon, 1 Feb 2016 10:00:03 -0800
From:	Brian Norris <computersforpeace@...il.com>
To:	Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
Cc:	Robert Jarzmik <robert.jarzmik@...e.fr>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	David Woodhouse <dwmw2@...radead.org>,
	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mtd: nand: pxa3xx_nand: add register access debug

On Fri, Jan 29, 2016 at 11:47:07AM -0300, Ezequiel Garcia wrote:
> On 25 Jan 09:29 PM, Robert Jarzmik wrote:
> > Add verbose debug for register accesses. This enables easier debugging
> > by following where and how hardware is stimulated, and how it answers.
> > 
> > Signed-off-by: Robert Jarzmik <robert.jarzmik@...e.fr>
> > ---
[...]
> 
> With verbose debug enabled, it looks like this:
> 
> [..]
> [   99.909883] pxa3xx-nand f10d0000.nand: pxa3xx_nand_irq():793 nand_readl(0x0014): 0x1
> [   99.909896] pxa3xx-nand f10d0000.nand: pxa3xx_nand_irq():843 nand_writel(0x1, 0x0014)
> [   99.909902] pxa3xx-nand f10d0000.nand: pxa3xx_nand_irq():857 nand_writel(0x300d3000, 0x0048)
> [   99.909909] pxa3xx-nand f10d0000.nand: pxa3xx_nand_irq():858 nand_writel(0x60000, 0x0048)
> [   99.909915] pxa3xx-nand f10d0000.nand: pxa3xx_nand_irq():859 nand_writel(0x0, 0x0048)
> [   99.909921] pxa3xx-nand f10d0000.nand: pxa3xx_nand_irq():863 nand_writel(0x820, 0x0048)
> [   99.910037] pxa3xx-nand f10d0000.nand: pxa3xx_nand_irq():793 nand_readl(0x0014): 0x2
> 
> Maybe it would look clearer with:
> 
> [   99.910037] pxa3xx-nand f10d0000.nand: pxa3xx_nand_irq():793 nand_readl(0x0014) = 0x2

Seems reasonable. I made that change myself, and applied it to
l2-mtd.git.

> But if you feel it's just bikeshedding then:

Maybe :)

> Acked-by: Ezequiel Garcia <ezequiel@...guardiasur.com.ar>

Thanks!