linux-kernel - Re: [linux-sunxi] [PATCH v3 2/2] media: cedrus: Add H264 decoding support

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Message-ID: <20190212104314.slytpbufwhf5ujv7@flea>
Date:   Tue, 12 Feb 2019 11:43:14 +0100
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Jernej Škrabec <jernej.skrabec@...il.com>
Cc:     linux-sunxi@...glegroups.com, hans.verkuil@...co.com,
        acourbot@...omium.org, sakari.ailus@...ux.intel.com,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        tfiga@...omium.org, posciak@...omium.org,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        nicolas.dufresne@...labora.com, jenskuske@...il.com,
        jonas@...boo.se, ezequiel@...labora.com,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [linux-sunxi] [PATCH v3 2/2] media: cedrus: Add H264 decoding
 support

Hi,

On Mon, Feb 11, 2019 at 08:21:31PM +0100, Jernej Škrabec wrote:
> > +	reg = 0;
> > +	/*
> > +	 * FIXME: This bit tells the video engine to use the default
> > +	 * quantization matrices. This will obviously need to be
> > +	 * changed to support the profiles supporting custom
> > +	 * quantization matrices.
> > +	 */
> > +	reg |= VE_H264_SHS_QP_SCALING_MATRIX_DEFAULT;
> 
> This flag should not be needed anymore. From what I see, you correctly set 
> scaling matrix every time.

The scaling matrix control is optional, so I guess we should protect
that by a check on whether that control has been set or not. What do
you think?

Thanks!
Maxime

-- 
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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