linux-kernel - Re: [PATCH 4/9] drm/i915/intel_i2c: cleanup gmbus/gpio pin assignments

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Date:	Wed, 07 Mar 2012 12:17:30 +0000
From:	Chris Wilson <chris@...is-wilson.co.uk>
To:	Daniel Kurtz <djkurtz@...omium.org>,
	Keith Packard <keithp@...thp.com>,
	David Airlie <airlied@...ux.ie>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:	Benson Leung <bleung@...omium.org>,
	Yufeng Shen <miletus@...omium.org>,
	Sameer Nanda <snanda@...omium.org>,
	Daniel Kurtz <djkurtz@...omium.org>
Subject: Re: [PATCH 4/9] drm/i915/intel_i2c: cleanup gmbus/gpio pin assignments

On Wed,  7 Mar 2012 19:50:45 +0800, Daniel Kurtz <djkurtz@...omium.org> wrote:
> There is no "disabled" port 0.  So, don't even try to initialize/scan
> it, etc.  This saves a bit of time when initializing the driver, since
> the we can avoid a 50ms timeout waiting for a device to respond on
> a port that doesn't even exist.
> 
> Similarly, don't initialize the reserved port, either.

> @@ -150,32 +164,23 @@ static void set_data(void *data, int state_high)
>  static struct i2c_adapter *
>  intel_gpio_create(struct drm_i915_private *dev_priv, u32 pin)
>  {
> -	static const int map_pin_to_reg[] = {
> -		0,
> -		GPIOB,
> -		GPIOA,
> -		GPIOC,
> -		GPIOD,
> -		GPIOE,
> -		GPIOF,
> -		0,
> -	};
>  	struct intel_gpio *gpio;
>  
> -	if (pin >= ARRAY_SIZE(map_pin_to_reg) || !map_pin_to_reg[pin])

And that doesn't do what your changelog proposes? Why?
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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