linux-kernel - Re: [PATCH 5/9] drm: bridge/dw_hdmi: avoid being recursive in N calculation

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Message-ID: <CAD=FV=WJAm=EpugwnnBjPKJV1OOybyE6hkdhU2RrN0AR2qae6w@mail.gmail.com>
Date:	Fri, 4 Sep 2015 10:50:19 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Russell King <rmk+kernel@....linux.org.uk>
Cc:	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
	alsa-devel@...a-project.org,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Andy Yan <andy.yan@...k-chips.com>,
	Yakir Yang <ykk@...k-chips.com>,
	Fabio Estevam <fabio.estevam@...escale.com>,
	Mark Brown <broonie@...nel.org>, Takashi Iwai <tiwai@...e.de>,
	Jaroslav Kysela <perex@...ex.cz>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Jon Nettleton <jon.nettleton@...il.com>,
	David Airlie <airlied@...ux.ie>
Subject: Re: [PATCH 5/9] drm: bridge/dw_hdmi: avoid being recursive in N calculation

Russell,

On Sat, Aug 8, 2015 at 9:10 AM, Russell King
<rmk+kernel@....linux.org.uk> wrote:
> There's no need to be recursive when computing the N value for the ACR
> packet - we can instead calculate the multiplier prior to our switch()
> based lookup, and multiply the N value appropriately afterwards.
>
> Signed-off-by: Russell King <rmk+kernel@....linux.org.uk>
> ---
>  drivers/gpu/drm/bridge/dw_hdmi.c | 25 +++++++++----------------
>  1 file changed, 9 insertions(+), 16 deletions(-)

For what it's worth, I backported this change into my local 3.14-based
tree and it worked for me.  It also looks good to me.

Reviewed-by: Douglas Anderson <dianders@...omium.org>
Tested-by: Douglas Anderson <dianders@...omium.org>
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