linux-kernel - Re: [PATCH] agp/intel: Fix dma mask for Sandybridge

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Date:	Mon, 23 Aug 2010 08:02:42 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Zhenyu Wang <zhenyuw@...ux.intel.com>
Cc:	Eric Anholt <eric@...olt.net>, David Airlie <airlied@...ux.ie>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] agp/intel: Fix dma mask for Sandybridge

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@...ux.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@...ux.intel.com>
> Signed-off-by: Eric Anholt <eric@...olt.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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