linux-kernel - Re: [PATCH] clk: imx: clk-pllv3: Use readl_poll

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Date:   Wed, 18 Mar 2020 13:14:00 +0200
From:   Abel Vesa <abel.vesa@....com>
To:     Anson Huang <Anson.Huang@....com>
Cc:     mturquette@...libre.com, sboyd@...nel.org, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        allison@...utok.net, gustavo@...eddedor.com,
        kstewart@...uxfoundation.org, tglx@...utronix.de,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Linux-imx@....com
Subject: Re: [PATCH] clk: imx: clk-pllv3: Use readl_poll_timeout() for PLL
 lock wait

On 20-03-18 11:26:44, Anson Huang wrote:
> Use readl_poll_timeout() for PLL lock wait which can simplify the
> code a lot.
> 
> Signed-off-by: Anson Huang <Anson.Huang@....com>

Reviewed-by: Abel Vesa <abel.vesa@....com>

> ---
>  drivers/clk/imx/clk-pllv3.c | 16 +++++-----------
>  1 file changed, 5 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/clk/imx/clk-pllv3.c b/drivers/clk/imx/clk-pllv3.c
> index df91a82..3dfa9c3 100644
> --- a/drivers/clk/imx/clk-pllv3.c
> +++ b/drivers/clk/imx/clk-pllv3.c
> @@ -7,6 +7,7 @@
>  #include <linux/clk-provider.h>
>  #include <linux/delay.h>
>  #include <linux/io.h>
> +#include <linux/iopoll.h>
>  #include <linux/slab.h>
>  #include <linux/jiffies.h>
>  #include <linux/err.h>
> @@ -25,6 +26,8 @@
>  #define IMX7_ENET_PLL_POWER	(0x1 << 5)
>  #define IMX7_DDR_PLL_POWER	(0x1 << 20)
>  
> +#define PLL_LOCK_TIMEOUT	10000
> +
>  /**
>   * struct clk_pllv3 - IMX PLL clock version 3
>   * @clk_hw:	 clock source
> @@ -53,23 +56,14 @@ struct clk_pllv3 {
>  
>  static int clk_pllv3_wait_lock(struct clk_pllv3 *pll)
>  {
> -	unsigned long timeout = jiffies + msecs_to_jiffies(10);
>  	u32 val = readl_relaxed(pll->base) & pll->power_bit;
>  
>  	/* No need to wait for lock when pll is not powered up */
>  	if ((pll->powerup_set && !val) || (!pll->powerup_set && val))
>  		return 0;
>  
> -	/* Wait for PLL to lock */
> -	do {
> -		if (readl_relaxed(pll->base) & BM_PLL_LOCK)
> -			break;
> -		if (time_after(jiffies, timeout))
> -			break;
> -		usleep_range(50, 500);
> -	} while (1);
> -
> -	return readl_relaxed(pll->base) & BM_PLL_LOCK ? 0 : -ETIMEDOUT;
> +	return readl_poll_timeout(pll->base, val, val & BM_PLL_LOCK, 500,
> +				  PLL_LOCK_TIMEOUT);
>  }
>  
>  static int clk_pllv3_prepare(struct clk_hw *hw)
> -- 
> 2.7.4
>