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Date: Sat, 14 Sep 2013 18:49:08 +0200
From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
To: Boris BREZILLON <b.brezillon@...rkiz.com>
Cc: Rob Herring <rob.herring@...xeda.com>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Stephen Warren <swarren@...dotorg.org>,
Ian Campbell <ian.campbell@...rix.com>,
Rob Landley <rob@...dley.net>,
Linus Walleij <linus.walleij@...aro.org>,
Grant Likely <grant.likely@...aro.org>,
Nicolas Ferre <nicolas.ferre@...el.com>,
Richard Genoud <richard.genoud@...il.com>,
Jiri Kosina <jkosina@...e.cz>, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-doc@...r.kernel.org
Subject: Re: [RFC PATCH 2/4] pinctrl: at91: fix sam9x5 debounce/deglitch
functions
On 09:47 Fri 13 Sep , Boris BREZILLON wrote:
> Replace at91_mux_get_deglitch with at91_mux_pio3_get_deglitch when using
> sam9x5 (pio3) IP.
> at91_mux_get_deglitch only test the activation of the "Input Filter" which
> may be overloaded by the activation of the "Input Filter Slow Clock" to use
> the input filter as a debounce filter instead of a deglitch filter.
>
> Fix at91_mux_pio3_get_debounce to test the activation of the Input Filter
> before testing the activation of the debounce filter (Input Filter Slow
> Clock depends on Input Filter).
>
> Fix at91_mux_pio3_set_debounce function to avoid disabling the deglitch
> filter ("Input Filter") when debounce filter is disabled.
>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
> Signed-off-by: Boris BREZILLON <b.brezillon@...rkiz.com>
> ---
> drivers/pinctrl/pinctrl-at91.c | 18 +++++++++++++-----
> 1 file changed, 13 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/pinctrl/pinctrl-at91.c b/drivers/pinctrl/pinctrl-at91.c
> index 50b555a..6624bce 100644
> --- a/drivers/pinctrl/pinctrl-at91.c
> +++ b/drivers/pinctrl/pinctrl-at91.c
> @@ -417,6 +417,14 @@ static void at91_mux_set_deglitch(void __iomem *pio, unsigned mask, bool is_on)
> __raw_writel(mask, pio + (is_on ? PIO_IFER : PIO_IFDR));
> }
>
> +static bool at91_mux_pio3_get_deglitch(void __iomem *pio, unsigned pin)
> +{
> + if ((__raw_readl(pio + PIO_IFSR) >> pin) & 0x1)
> + return !((__raw_readl(pio + PIO_IFSCSR) >> pin) & 0x1);
> +
> + return false;
> +}
> +
> static void at91_mux_pio3_set_deglitch(void __iomem *pio, unsigned mask, bool is_on)
> {
> if (is_on)
> @@ -428,7 +436,8 @@ static bool at91_mux_pio3_get_debounce(void __iomem *pio, unsigned pin, u32 *div
> {
> *div = __raw_readl(pio + PIO_SCDR);
>
> - return (__raw_readl(pio + PIO_IFSCSR) >> pin) & 0x1;
> + return ((__raw_readl(pio + PIO_IFSR) >> pin) & 0x1) &&
> + ((__raw_readl(pio + PIO_IFSCSR) >> pin) & 0x1);
> }
>
> static void at91_mux_pio3_set_debounce(void __iomem *pio, unsigned mask,
> @@ -438,9 +447,8 @@ static void at91_mux_pio3_set_debounce(void __iomem *pio, unsigned mask,
> __raw_writel(mask, pio + PIO_IFSCER);
> __raw_writel(div & PIO_SCDR_DIV, pio + PIO_SCDR);
> __raw_writel(mask, pio + PIO_IFER);
> - } else {
> - __raw_writel(mask, pio + PIO_IFDR);
> - }
> + } else
> + __raw_writel(mask, pio + PIO_IFSCDR);
> }
>
> static bool at91_mux_pio3_get_pulldown(void __iomem *pio, unsigned pin)
> @@ -478,7 +486,7 @@ static struct at91_pinctrl_mux_ops at91sam9x5_ops = {
> .mux_B_periph = at91_mux_pio3_set_B_periph,
> .mux_C_periph = at91_mux_pio3_set_C_periph,
> .mux_D_periph = at91_mux_pio3_set_D_periph,
> - .get_deglitch = at91_mux_get_deglitch,
> + .get_deglitch = at91_mux_pio3_get_deglitch,
> .set_deglitch = at91_mux_pio3_set_deglitch,
> .get_debounce = at91_mux_pio3_get_debounce,
> .set_debounce = at91_mux_pio3_set_debounce,
> --
> 1.7.9.5
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
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