linux-kernel - Re: [PATCH v4 2/8] [media] VPU: mediatek: support Mediatek VPU

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Date:	Mon, 15 Feb 2016 19:27:36 +0800
From:	tiffany lin <tiffany.lin@...iatek.com>
To:	Hans Verkuil <hverkuil@...all.nl>
CC:	Hans Verkuil <hans.verkuil@...co.com>,
	<daniel.thompson@...aro.org>, "Rob Herring" <robh+dt@...nel.org>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Daniel Kurtz <djkurtz@...omium.org>,
	Pawel Osciak <posciak@...omium.org>,
	Eddie Huang <eddie.huang@...iatek.com>,
	Yingjoe Chen <yingjoe.chen@...iatek.com>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-media@...r.kernel.org>,
	<linux-mediatek@...ts.infradead.org>, <PoChun.Lin@...iatek.com>,
	Andrew-CT Chen <andrew-ct.chen@...iatek.com>
Subject: Re: [PATCH v4 2/8] [media] VPU: mediatek: support Mediatek VPU

On Mon, 2016-02-15 at 11:13 +0100, Hans Verkuil wrote:
> On 02/04/2016 12:34 PM, Tiffany Lin wrote:
> > The VPU driver for hw video codec embedded in Mediatek's MT8173 SOCs.
> > It is able to handle video decoding/encoding of in a range of formats.
> > The driver provides with VPU firmware download, memory management and
> > the communication interface between CPU and VPU.
> > For VPU initialization, it will create virtual memory for CPU access and
> > IOMMU address for vcodec hw device access. When a decode/encode instance
> > opens a device node, vpu driver will download vpu firmware to the device.
> > A decode/encode instant will decode/encode a frame using VPU
> > interface to interrupt vpu to handle decoding/encoding jobs.
> > 
> > Signed-off-by: Andrew-CT Chen <andrew-ct.chen@...iatek.com>
> > Signed-off-by: Tiffany Lin <tiffany.lin@...iatek.com>
> > ---
> >  drivers/media/platform/Kconfig           |    9 +
> >  drivers/media/platform/Makefile          |    2 +
> >  drivers/media/platform/mtk-vpu/Makefile  |    1 +
> >  drivers/media/platform/mtk-vpu/mtk_vpu.c |  994 ++++++++++++++++++++++++++++++
> >  drivers/media/platform/mtk-vpu/mtk_vpu.h |  167 +++++
> >  5 files changed, 1173 insertions(+)
> >  create mode 100644 drivers/media/platform/mtk-vpu/Makefile
> >  create mode 100644 drivers/media/platform/mtk-vpu/mtk_vpu.c
> >  create mode 100644 drivers/media/platform/mtk-vpu/mtk_vpu.h
> > 
> > diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
> > index ccbc974..ba812d6 100644
> > --- a/drivers/media/platform/Kconfig
> > +++ b/drivers/media/platform/Kconfig
> > @@ -148,6 +148,15 @@ config VIDEO_CODA
> >  	   Coda is a range of video codec IPs that supports
> >  	   H.264, MPEG-4, and other video formats.
> >  
> > +config VIDEO_MEDIATEK_VPU
> > +	tristate "Mediatek Video Processor Unit"
> > +	depends on VIDEO_DEV && VIDEO_V4L2 && ARCH_MEDIATEK
> > +	---help---
> > +	    This driver provides downloading VPU firmware and
> > +	    communicating with VPU. This driver for hw video
> > +	    codec embedded in new Mediatek's SOCs. It is able
> > +	    to handle video decoding/encoding in a range of formats.
> 
> Can you be more specific in this text and mention for which Mediatek SoCs
> this driver is for? Just like you did in the commit log.
> 
Got it. We will add more specific description in Kconfig in next
version.

> Also add something like this:
> 
>           To compile this driver as a module, choose M here: the module
>           will be called mtk-vpu.
> 
> I always find it useful if the Kconfig text mentions the module name.
> 
Got it. We will fix this. Thanks for sharing experience.


best regards,
Tiffany

> Regards,
> 
> 	Hans
> 
> > +
> >  config VIDEO_MEM2MEM_DEINTERLACE
> >  	tristate "Deinterlace support"
> >  	depends on VIDEO_DEV && VIDEO_V4L2 && DMA_ENGINE
>