Date: Mon, 23 Aug 2010 08:02:42 +0200
Message-ID: <s5hzkwddfy5.wl%tiwai@suse.de>
From: Takashi Iwai <tiwai@suse.de>
To: Zhenyu Wang <zhenyuw@linux.intel.com>
Cc: Eric Anholt <eric@anholt.net>, David Airlie <airlied@linux.ie>,
        dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] agp/intel: Fix dma mask for Sandybridge
In-Reply-To: <20100823054303.GC29442@zhen-devel.sh.intel.com>
References: <s5hlj81cn4n.wl%tiwai@suse.de>
	<20100823013507.GA29442@zhen-devel.sh.intel.com>
	<s5h62z1ew1y.wl%tiwai@suse.de>
	<20100823054303.GC29442@zhen-devel.sh.intel.com>
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At Mon, 23 Aug 2010 13:43:03 +0800,
Zhenyu Wang wrote:
> 
> On 2010.08.23 07:29:29 +0200, Takashi Iwai wrote:
> > > Sandybridge can do 40-bit dma mask. This has been fixed upstream now.
> > 
> > Could you point where is the upstream GIT tree and the corresponding
> > commit id?
> > 
> 
> Linus's tree:
> 
> commit 877fdacf8291d7627f339885b5ae52c2f6061734
> Author: Zhenyu Wang <zhenyuw@linux.intel.com>
> Date:   Thu Aug 19 09:46:13 2010 +0800
> 
> agp/intel: set 40-bit dma mask on Sandybridge
>         
> Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
> Signed-off-by: Eric Anholt <eric@anholt.net>

Thanks.

But, isn't it better to add .dma_mask field to struct
agp_bridge_driver?

Also, I don't understand the logic of 40bit addr calculation:

> static unsigned long intel_gen6_mask_memory(struct agp_bridge_data *bridge,
>                                             dma_addr_t addr, int type)
> {
>         /* Shift high bits down */
>        addr |= (addr >> 28) & 0xff;

Isn't it 0xff0?


Takashi
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