linux-kernel - Re: [PATCH 2/3 v2] gpio: Add support for Intel ICHx/3100/Series[56] GPIO

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Date:	Tue, 7 Feb 2012 23:07:41 +0100
From:	Jean Delvare <khali@...ux-fr.org>
To:	Aaron Sierra <asierra@...-inc.com>
Cc:	guenter roeck <guenter.roeck@...csson.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Tyser <ptyser@...-inc.com>
Subject: Re: [PATCH 2/3 v2] gpio: Add support for Intel ICHx/3100/Series[56]
 GPIO

On Tue, 07 Feb 2012 13:58:31 -0600 (CST), Aaron Sierra wrote:
> This driver works on many Intel chipsets, including the ICH6, ICH7,
> ICH8, ICH9, ICH10, 3100, Series 5/3400 (Ibex Peak), Series 6/C200
> (Cougar Point), and NM10 (Tiger Point).
> 
> Additional Intel chipsets should be easily supported if needed, eg the
> ICH1-5, EP80579, etc.
> 
> Tested on QM67 (Cougar Point), QM57 (Ibex Peak), 3100 (Whitmore Lake),
> and NM10 (Tiger Point).
> (...)
> +static int ichx_write_bit(int reg, unsigned nr, int val, int verify)
> +{
> +	unsigned long flags;
> +	u32 data, tmp;
> +	int reg_nr = nr / 32;
> +	int bit = nr & 0x1f;
> +	int ret = 0;
> +
> +	spin_lock_irqsave(&ichx_priv.lock, flags);
> +
> +	data = ICHX_READ(ichx_regs[reg][reg_nr], ichx_priv.gpio_base);
> +	data = (data & ~(1 << bit)) | (val << bit);

I posted a fix for this function last Sunday:

Subject: [PATCH] gpio-ich: Fix setting GPIO value
Date: Sun, 5 Feb 2012 21:44:44 +0100

Please apply it, otherwise your driver doesn't implement the gpio
driver API properly and code running on top of it (consumer drivers)
may fail.

> +	ICHX_WRITE(data, ichx_regs[reg][reg_nr], ichx_priv.gpio_base);
> +	tmp = ICHX_READ(ichx_regs[reg][reg_nr], ichx_priv.gpio_base);
> +	if (verify && (data != tmp))
> +		ret = -EPERM;
> +
> +	spin_unlock_irqrestore(&ichx_priv.lock, flags);
> +
> +	return ret;
> +}

-- 
Jean Delvare
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