linux-kernel - Re: [PATCH v2 4/4] fbdev: sh_mobile_lcdc: use dma_mmap

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Date:	Thu, 26 Jul 2012 13:20:44 +0200
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Hideki EIRAKU <hdk@...l.co.jp>
Cc:	Russell King <linux@....linux.org.uk>,
	Pawel Osciak <pawel@...iak.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	Florian Tobias Schandinat <FlorianSchandinat@....de>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org, linux-fbdev@...r.kernel.org,
	alsa-devel@...a-project.org, Katsuya MATSUBARA <matsu@...l.co.jp>
Subject: Re: [PATCH v2 4/4] fbdev: sh_mobile_lcdc: use dma_mmap_coherent if available

Hi Eiraku-san,

On Thursday 26 July 2012 20:13:11 Hideki EIRAKU wrote:
> fb_mmap() implemented in fbmem.c uses smem_start as the physical
> address of the frame buffer.  In the sh_mobile_lcdc driver, the
> smem_start is a dma_addr_t that is not a physical address when IOMMU is
> enabled.  dma_mmap_coherent() maps the address correctly.  It is
> available on ARM platforms.
> 
> Signed-off-by: Hideki EIRAKU <hdk@...l.co.jp>

Acked-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

-- 
Regards,

Laurent Pinchart

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