linux-kernel - Re: [linux-sunxi] Re: [PATCH v4 01/11] clk: sunxi: Add display and TCON0 clocks driver

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Date:	Thu, 12 May 2016 10:30:47 +0200
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Priit Laes <plaes@...es.org>
Cc:	Stephen Boyd <sboyd@...eaurora.org>,
	Mike Turquette <mturquette@...libre.com>,
	David Airlie <airlied@...ux.ie>, Chen-Yu Tsai <wens@...e.org>,
	Rob Herring <robh+dt@...nel.org>,
	Daniel Vetter <daniel@...ll.ch>,
	Hans de Goede <hdegoede@...hat.com>,
	devicetree@...r.kernel.org, linux-clk@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-sunxi@...glegroups.com, dri-devel@...ts.freedesktop.org,
	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Alexander Kaplan <alex@...tthing.co>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: Re: [linux-sunxi] Re: [PATCH v4 01/11] clk: sunxi: Add display and
 TCON0 clocks driver

On Thu, May 12, 2016 at 08:59:43AM +0200, Maxime Ripard wrote:
> On Thu, May 12, 2016 at 06:39:20AM +0300, Priit Laes wrote:
> > On Wed, 2016-05-11 at 15:15 -0700, Stephen Boyd wrote:
> > > On 05/10, Priit Laes wrote:
> > > > 
> > > > On Mon, 2016-05-09 at 15:39 -0700, Stephen Boyd wrote:
> > > > > 
> > > > > On 05/09, Stephen Boyd wrote:
> > > > > > 
> > > > > > 
> > > > > > 
> > > > > > Ok I applied this one to clk-next.
> > > > > > 
> > > > > And I squashed this in to silence the following checker warning.
> > > > > 
> > > > > drivers/clk/sunxi/clk-sun4i-display.c:110:33: warning: Variable
> > > > > length array is used.
> > > > > 
> > > > > ---8<---
> > > > > diff --git a/drivers/clk/sunxi/clk-sun4i-display.c
> > > > > b/drivers/clk/sunxi/clk-sun4i-display.c
> > > > > index f02e250e64ed..f8ff6c4a5633 100644
> > > > > --- a/drivers/clk/sunxi/clk-sun4i-display.c
> > > > > +++ b/drivers/clk/sunxi/clk-sun4i-display.c
> > > > > @@ -107,7 +107,7 @@ static int
> > > > > sun4i_a10_display_reset_xlate(struct
> > > > > reset_controller_dev *rcdev,
> > > > >  static void __init sun4i_a10_display_init(struct device_node
> > > > > *node,
> > > > >  					  const struct
> > > > > sun4i_a10_display_clk_data *data)
> > > > >  {
> > > > > -	const char *parents[data->parents];
> > > > > +	const char *parents[4];
> > > > This change breaks at least de_[bf]e clocks which have 3 clock
> > > > parents.
> > 
> > > I just used the largest data->parents number, which was 4. How
> > > does that break anything?
> > 
> > If you look at the sun4i_a10_display_init, it contains this block:
> > 
> >     ret = of_clk_parent_fill(node, parents, ARRAY_SIZE(parents));
> >     if (ret != ARRAY_SIZE(parents)) {
> >         pr_err("%s: Could not retrieve the parents\n", clk_name);
> >         goto unmap;
> >     }
> > 
> > of_clk_parent_fill returns 3 for de_be/de_fe nodes, and
> > ARRAY_SIZE(parents) is 4.
> 
> Replacing both ARRAY_SIZE(parents) by data->parents would work though.

I just tested on top of current next, and indeed the following patch
is needed.

Stephen, could you squash it in the former patch?

diff --git a/drivers/clk/sunxi/clk-sun4i-display.c b/drivers/clk/sunxi/clk-sun4i-display.c
index 70803aa7028c..9780fac6d029 100644
--- a/drivers/clk/sunxi/clk-sun4i-display.c
+++ b/drivers/clk/sunxi/clk-sun4i-display.c
@@ -128,8 +128,8 @@ static void __init sun4i_a10_display_init(struct device_node *node,
 		return;
 	}
 
-	ret = of_clk_parent_fill(node, parents, ARRAY_SIZE(parents));
-	if (ret != ARRAY_SIZE(parents)) {
+	ret = of_clk_parent_fill(node, parents, data->parents);
+	if (ret != data->parents) {
 		pr_err("%s: Could not retrieve the parents\n", clk_name);
 		goto unmap;
 	}

Thanks!
Maxime					  

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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