linux-kernel - Re: [PATCH v8 25/42] ARM: davinci: dm644x: add new clock init using common clock framework

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Date:   Tue, 3 Apr 2018 15:56:32 +0530
From:   Sekhar Nori <nsekhar@...com>
To:     David Lechner <david@...hnology.com>, <linux-clk@...r.kernel.org>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
CC:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Kevin Hilman <khilman@...nel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Adam Ford <aford173@...il.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8 25/42] ARM: davinci: dm644x: add new clock init using
 common clock framework

On Friday 16 March 2018 08:22 AM, David Lechner wrote:
> +static struct resource dm644x_pll1_resources[] = {
> +	{
> +		.start	= DAVINCI_PLL1_BASE,
> +		.end	= DAVINCI_PLL1_BASE + SZ_4K - 1,

The .end should be DAVINCI_PLL1_BASE + SZ_1K - 1, otherwise it prevents
PLL2 from getting registered.

> +		.flags	= IORESOURCE_MEM,
> +	},
> +};
> +
> +static struct platform_device dm644x_pll1_device = {
> +	.name		= "dm644x-pll1",
> +	.id		= -1,
> +	.resource	= dm644x_pll1_resources,
> +	.num_resources	= ARRAY_SIZE(dm644x_pll1_resources),
> +};
> +
> +static struct resource dm644x_pll2_resources[] = {
> +	{
> +		.start	= DAVINCI_PLL2_BASE,
> +		.end	= DAVINCI_PLL2_BASE + SZ_4K - 1,

And this too should be fixed, else it prevents the PSC from getting
registered.

> +		.flags	= IORESOURCE_MEM,
> +	},
> +};

With these fixed, I still had to enable 'clk_ignore_unused' on DM644x
EVM to get to NFS boot. I think root of the problem is that pm_runtime()
APIs are not working in the legacy boot mode.

This can be seen even on the DA850 LCDK in legacy boot. pm_genpd_summary
in debugfs shows all domains are off and there are no devices registered
under the "da850-psc1: emac" domain. NFS mounting still works on the
DA850 LCDK because clk_summary shows enable and prepare count of 4 for
emac. Not sure how that's happening. But on DM644x EVM, the emac clock
enable count is 0.

Still looking at whats going wrong here. I am testing your v8 branch
with clk-davinci branch from clk-next merged to get the fixes Stephen made.

Thanks,
Sekhar