linux-kernel - Re: [PATCH 2/2] clk: sunxi-ng: fix up PLL

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Message-ID: <138cc32f-4c0a-2731-9517-d67be7103cca@free-electrons.com>
Date:   Sun, 6 Nov 2016 19:04:48 +0100
From:   Quentin Schulz <quentin.schulz@...e-electrons.com>
To:     Icenowy Zheng <icenowy@...c.xyz>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>
Cc:     Jorik Jonker <jorik@...pendief.biz>, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: Re: [PATCH 2/2] clk: sunxi-ng: fix up PLL_CPUX adjusting for A23/A33

Hi Icenowy,

This patch (2/2) should be before the first one.

The first patch allows adjusting of the PLL and the second fixes a
problem with the adjustment of the PLL.

You should fix the problem before allowing the adjustment of the PLL.
That way, if someone builds the kernel between your two patches, the
kernel is supposed to be working.

Tested in correct order on A33.

Thanks!

Quentin

On 06/11/2016 18:29, Icenowy Zheng wrote:
> When adjusting PLL_CPUX on A23/A33, the PLL is driven too high, and the
> system stucks.
> 
> Add a notifier to avoid this situation.
> 
> The code is ported from ccu-sun6i-a31.c.
> 
> Signed-off-by: Icenowy Zheng <icenowy@...c.xyz>
> ---
> Patch 4.9-rc too.
>  drivers/clk/sunxi-ng/ccu-sun8i-a23.c | 10 ++++++++++
>  drivers/clk/sunxi-ng/ccu-sun8i-a33.c | 10 ++++++++++
>  2 files changed, 20 insertions(+)
> 
> diff --git a/drivers/clk/sunxi-ng/ccu-sun8i-a23.c b/drivers/clk/sunxi-ng/ccu-sun8i-a23.c
> index 44c4775..41a8594 100644
> --- a/drivers/clk/sunxi-ng/ccu-sun8i-a23.c
> +++ b/drivers/clk/sunxi-ng/ccu-sun8i-a23.c
> @@ -709,6 +709,13 @@ static const struct sunxi_ccu_desc sun8i_a23_ccu_desc = {
>  	.num_resets	= ARRAY_SIZE(sun8i_a23_ccu_resets),
>  };
>  
> +static struct ccu_mux_nb sun8i_a23_cpu_nb = {
> +	.common		= &cpux_clk.common,
> +	.cm		= &cpux_clk.mux,
> +	.delay_us	= 1, /* > 8 clock cycles at 24 MHz */
> +	.bypass_index	= 1, /* index of 24 MHz oscillator */
> +};
> +
>  static void __init sun8i_a23_ccu_setup(struct device_node *node)
>  {
>  	void __iomem *reg;
> @@ -732,6 +739,9 @@ static void __init sun8i_a23_ccu_setup(struct device_node *node)
>  	writel(val, reg + SUN8I_A23_PLL_MIPI_REG);
>  
>  	sunxi_ccu_probe(node, reg, &sun8i_a23_ccu_desc);
> +
> +	ccu_mux_notifier_register(pll_cpux_clk.common.hw.clk,
> +				  &sun8i_a23_cpu_nb);
>  }
>  CLK_OF_DECLARE(sun8i_a23_ccu, "allwinner,sun8i-a23-ccu",
>  	       sun8i_a23_ccu_setup);
> diff --git a/drivers/clk/sunxi-ng/ccu-sun8i-a33.c b/drivers/clk/sunxi-ng/ccu-sun8i-a33.c
> index 59cfdc8..3efbb6e 100644
> --- a/drivers/clk/sunxi-ng/ccu-sun8i-a33.c
> +++ b/drivers/clk/sunxi-ng/ccu-sun8i-a33.c
> @@ -752,6 +752,13 @@ static const struct sunxi_ccu_desc sun8i_a33_ccu_desc = {
>  	.num_resets	= ARRAY_SIZE(sun8i_a33_ccu_resets),
>  };
>  
> +static struct ccu_mux_nb sun8i_a33_cpu_nb = {
> +	.common		= &cpux_clk.common,
> +	.cm		= &cpux_clk.mux,
> +	.delay_us	= 1, /* > 8 clock cycles at 24 MHz */
> +	.bypass_index	= 1, /* index of 24 MHz oscillator */
> +};
> +
>  static void __init sun8i_a33_ccu_setup(struct device_node *node)
>  {
>  	void __iomem *reg;
> @@ -775,6 +782,9 @@ static void __init sun8i_a33_ccu_setup(struct device_node *node)
>  	writel(val, reg + SUN8I_A33_PLL_MIPI_REG);
>  
>  	sunxi_ccu_probe(node, reg, &sun8i_a33_ccu_desc);
> +
> +	ccu_mux_notifier_register(pll_cpux_clk.common.hw.clk,
> +				  &sun8i_a33_cpu_nb);
>  }
>  CLK_OF_DECLARE(sun8i_a33_ccu, "allwinner,sun8i-a33-ccu",
>  	       sun8i_a33_ccu_setup);
> 

-- 
Quentin Schulz, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com