linux-kernel - Re: [PATCH] ARM: rockchip: disable dapswjdp during suspend

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Message-ID: <2083913.tsdTRJp6Sn@diego>
Date:	Sat, 25 Apr 2015 02:14:58 +0200
From:	Heiko Stübner <heiko@...ech.de>
To:	Chris Zhong <zyw@...k-chips.com>
Cc:	dianders@...omium.org, dtor@...omium.org, sonnyrao@...omium.org,
	linux-rockchip@...ts.infradead.org,
	Russell King <linux@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: rockchip: disable dapswjdp during suspend

Am Mittwoch, 15. April 2015, 13:57:11 schrieb Chris Zhong:
> Reset dapswjdp is controlled by JTAG_TRSTN, if the iomux of this pin is
> not "jtag_trstn". the AP would think this pin is always high, so it can
> not reset before resume. When system resume, but the dapswjdp is not in
> a default state, it may Access some illegal address, it cause system
> crash during resume.
> Let's disable this jtag function by clear the dapdeviceen bit, it
> prohibit the dapswjdp to access memory and registers. This bit would
> be enable in MASKROM, so we need clear it in suspend everytime.
> 
> Signed-off-by: Chris Zhong <zyw@...k-chips.com>

applied to a fixes branch for 4.1


Thanks
Heiko
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