linux-kernel - Re: [PATCH] clk: rockchip: disable unused clocks

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Date:	Wed, 29 Oct 2014 22:53:32 +0100
From:	Heiko Stübner <heiko@...ech.de>
To:	Doug Anderson <dianders@...omium.org>
Cc:	Kever Yang <kever.yang@...k-chips.com>,
	Sonny Rao <sonnyrao@...omium.org>,
	Addy Ke <addy.ke@...k-chips.com>,
	Eddie Cai <cf@...k-chips.com>, Jianqun Xu <xjq@...k-chips.com>,
	han jiang <hj@...k-chips.com>,
	戴克霖 (Jack) <dkl@...k-chips.com>,
	Tao Huang <huangtao@...k-chips.com>,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
	Mike Turquette <mturquette@...aro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] clk: rockchip: disable unused clocks

Am Mittwoch, 29. Oktober 2014, 13:50:20 schrieb Doug Anderson:
> Kever,
> 
> On Wed, Oct 29, 2014 at 3:06 AM, Kever Yang <kever.yang@...k-chips.com> 
wrote:
> > The rockchip clock driver use CLK_IGNORE_UNUSED flag to make sure
> > all the clocks are available like default power on state.
> > We have implement the clock manage in most of rockchip drivers,
> > it is time to remove it for power save.
> > Instead we add CLK_IGNORE_UNUSED for some clock nodes which should
> > be on during boot or no module driver in kernel will initialize it.
> > 
> > Signed-off-by: Kever Yang <kever.yang@...k-chips.com>
> > ---
> > 
> >  drivers/clk/rockchip/clk-rk3188.c |  32 ++++-----
> >  drivers/clk/rockchip/clk-rk3288.c | 146
> >  +++++++++++++++++++------------------- drivers/clk/rockchip/clk.c       
> >  |   9 ---
> >  3 files changed, 90 insertions(+), 97 deletions(-)
> 
> Your patch didn't seem to apply to the top of Heiko's
> "v3.19-clk/next".  Where should it apply to?
> 
> > -       GATE(ACLK_CPU, "aclk_cpu", "aclk_cpu_pre", 0,
> > +       GATE(0, "aclk_cpu", "aclk_cpu_pre", CLK_IGNORE_UNUSED,
> > 
> >                         RK3288_CLKGATE_CON(0), 3, GFLAGS),
> 
> It seems strange to me that you're removing the ACLK_CPU ID here.  Was
> that on purpose?
> 
> > -       COMPOSITE_NOMUX(PCLK_CPU, "pclk_cpu", "aclk_cpu_pre", 0,
> > +       COMPOSITE_NOMUX(0, "pclk_cpu", "aclk_cpu_pre", CLK_IGNORE_UNUSED,
> > 
> >                         RK3288_CLKSEL_CON(1), 12, 3, DFLAGS,
> >                         RK3288_CLKGATE_CON(0), 5, GFLAGS),
> 
> Here too for PCLK_CPU.  There are a few others as well.

yeah, they should keep their clock ids


> I'll also say that when I applied this atop my local tree that USB
> stopped working.  I just see:
> 
> [ 1647.626747] hub 2-1:1.0: hub_port_status failed (err = -110)
> [ 1657.626746] hub 2-1:1.0: hub_port_status failed (err = -110)
> 
> ...over and over and over again.

maybe Kever's dwc2 clock-handling patch [0] might help there, as the dwc2-host 
currently does not seem to do any clock handling at all.


Heiko


[0] http://www.spinics.net/lists/linux-usb/msg116278.html
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