linux-kernel - Re: [PATCH 4/4] clk: zynq: Use of_init_clk

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Message-ID: <20121219183617.GC1005@beefymiracle.amer.corp.natinst.com>
Date:	Wed, 19 Dec 2012 12:36:17 -0600
From:	Josh Cartwright <josh.cartwright@...com>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	Mike Turquette <mturquette@...aro.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Soren Brinkmann <soren.brinkmann@...inx.com>
Subject: Re: [PATCH 4/4] clk: zynq: Use of_init_clk_data()

On Wed, Dec 19, 2012 at 10:20:30AM -0800, Stephen Boyd wrote:
> On 12/19/12 09:26, Josh Cartwright wrote:
> > On Mon, Dec 17, 2012 at 01:02:15PM -0800, Stephen Boyd wrote:
[..]
> 
> Can you show the code at those line numbers? There are quite a few
> WARN_ONs in that code and it's possible the WARN_ON is the one
> introduced in this patch.

It looks like we're not hitting the WARN_ON() you added, but several of
the other ones.

> >    ------------[ cut here ]------------
> >    WARNING: at drivers/clk/clk-zynq.c:159 zynq_periph_clk_setup+0x190/0x248()
> >    [<c000d814>] (unwind_backtrace+0x0/0xf8) from [<c0016808>] (warn_slowpath_common+0x50/0x60)
> >    [<c0016808>] (warn_slowpath_common+0x50/0x60) from [<c00168e0>] (warn_slowpath_null+0x1c/0x24)
> >    [<c00168e0>] (warn_slowpath_null+0x1c/0x24) from [<c0193520>] (zynq_periph_clk_setup+0x190/0x248)
> >    [<c0193520>] (zynq_periph_clk_setup+0x190/0x248) from [<c0192944>] (of_clk_init+0x30/0x58)
> >    [<c0192944>] (of_clk_init+0x30/0x58) from [<c0189708>] (xilinx_zynq_timer_init+0x40/0x48)
> >    [<c0189708>] (xilinx_zynq_timer_init+0x40/0x48) from [<c0185d54>] (time_init+0x28/0x30)
> >    [<c0185d54>] (time_init+0x28/0x30) from [<c0183650>] (start_kernel+0x1a8/0x2c0)
> >    [<c0183650>] (start_kernel+0x1a8/0x2c0) from [<00008074>] (0x8074)
> >    ---[ end trace 1b75b31a2719ed1c ]---

zynq_periph_clk_setup:
156 >-------periph->gates[0] = clk_register_gate(NULL, name, np->name, 0,
157 >------->------->------->------->-------     periph->clk_ctrl, 0, 0,
158 >------->------->------->------->-------     &periph->clkact_lock);
159 >-------if (WARN_ON(IS_ERR(periph->gates[0])))
160 >------->-------return;

> >    ------------[ cut here ]------------
> >    WARNING: at drivers/clk/clk-zynq.c:296 zynq_cpu_clk_setup+0x1e0/0x26c()
> >    [<c000d814>] (unwind_backtrace+0x0/0xf8) from [<c0016808>] (warn_slowpath_common+0x50/0x60)
> >    [<c0016808>] (warn_slowpath_common+0x50/0x60) from [<c00168e0>] (warn_slowpath_null+0x1c/0x24)
> >    [<c00168e0>] (warn_slowpath_null+0x1c/0x24) from [<c0193304>] (zynq_cpu_clk_setup+0x1e0/0x26c)
> >    [<c0193304>] (zynq_cpu_clk_setup+0x1e0/0x26c) from [<c0192944>] (of_clk_init+0x30/0x58)
> >    [<c0192944>] (of_clk_init+0x30/0x58) from [<c0189708>] (xilinx_zynq_timer_init+0x40/0x48)
> >    [<c0189708>] (xilinx_zynq_timer_init+0x40/0x48) from [<c0185d54>] (time_init+0x28/0x30)
> >    [<c0185d54>] (time_init+0x28/0x30) from [<c0183650>] (start_kernel+0x1a8/0x2c0)
> >    [<c0183650>] (start_kernel+0x1a8/0x2c0) from [<00008074>] (0x8074)
> >    ---[ end trace 1b75b31a2719ed1d ]---

zynq_cpu_subclk_setup:
295 >-------clk = clk_register(NULL, &subclk->hw);
296 >-------if (WARN_ON(IS_ERR(clk)))
297 >------->-------goto err_clk_register;

> >    ------------[ cut here ]------------
> >    WARNING: at drivers/clk/clk-zynq.c:347 zynq_cpu_clk_setup+0x210/0x26c()
> >    [<c000d814>] (unwind_backtrace+0x0/0xf8) from [<c0016808>] (warn_slowpath_common+0x50/0x60)
> >    [<c0016808>] (warn_slowpath_common+0x50/0x60) from [<c00168e0>] (warn_slowpath_null+0x1c/0x24)
> >    [<c00168e0>] (warn_slowpath_null+0x1c/0x24) from [<c0193334>] (zynq_cpu_clk_setup+0x210/0x26c)
> >    [<c0193334>] (zynq_cpu_clk_setup+0x210/0x26c) from [<c0192944>] (of_clk_init+0x30/0x58)
> >    [<c0192944>] (of_clk_init+0x30/0x58) from [<c0189708>] (xilinx_zynq_timer_init+0x40/0x48)
> >    [<c0189708>] (xilinx_zynq_timer_init+0x40/0x48) from [<c0185d54>] (time_init+0x28/0x30)
> >    [<c0185d54>] (time_init+0x28/0x30) fr m [<c0183650>] (start_kernel+0x1a8/0x2c0)
> >    [<c0183650>] (start_kernel+0x1a8/0x2c0) from [<00008074>] (0x8074)
> >    ---[ end trace 1b75b31a2719ed1e ]---

zynq_cpu_clk_setup:
345 >-------for (i = 0; i < 4; i++) {
346 >------->-------cpuclk->subclks[i] = zynq_cpu_subclk_setup(np, i, clk_621);
347 >------->-------if (WARN_ON(IS_ERR(cpuclk->subclks[i])))
348 >------->------->-------return;
349 >-------}

The third warning is a bit redundant, it is triggered by the same conditions
that triggered the second warning.

	  Josh
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