linux-kernel - Re: [PATCH] phy: st: miphy28lp: use _poll

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Message-ID: <d422fd7b-05e8-c29b-90f6-f2a4742411f1@foss.st.com>
Date:   Wed, 8 Mar 2023 09:48:08 +0100
From:   Patrice CHOTARD <patrice.chotard@...s.st.com>
To:     Alain Volmat <avolmat@...com>, Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-phy@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] phy: st: miphy28lp: use _poll_timeout functions for waits

Hi Alain

On 2/10/23 23:43, Alain Volmat wrote:
> This commit introduces _poll_timeout functions usage instead of
> wait loops waiting for a status bit.
> 
> Signed-off-by: Alain Volmat <avolmat@...com>
> ---
>  drivers/phy/st/phy-miphy28lp.c | 42 ++++++++--------------------------
>  1 file changed, 10 insertions(+), 32 deletions(-)
> 
> diff --git a/drivers/phy/st/phy-miphy28lp.c b/drivers/phy/st/phy-miphy28lp.c
> index 068160a34f5c..e30305b77f0d 100644
> --- a/drivers/phy/st/phy-miphy28lp.c
> +++ b/drivers/phy/st/phy-miphy28lp.c
> @@ -9,6 +9,7 @@
>  
>  #include <linux/platform_device.h>
>  #include <linux/io.h>
> +#include <linux/iopoll.h>
>  #include <linux/kernel.h>
>  #include <linux/module.h>
>  #include <linux/of.h>
> @@ -484,19 +485,11 @@ static inline void miphy28lp_pcie_config_gen(struct miphy28lp_phy *miphy_phy)
>  
>  static inline int miphy28lp_wait_compensation(struct miphy28lp_phy *miphy_phy)
>  {
> -	unsigned long finish = jiffies + 5 * HZ;
>  	u8 val;
>  
>  	/* Waiting for Compensation to complete */
> -	do {
> -		val = readb_relaxed(miphy_phy->base + MIPHY_COMP_FSM_6);
> -
> -		if (time_after_eq(jiffies, finish))
> -			return -EBUSY;
> -		cpu_relax();
> -	} while (!(val & COMP_DONE));
> -
> -	return 0;
> +	return readb_relaxed_poll_timeout(miphy_phy->base + MIPHY_COMP_FSM_6,
> +					  val, val & COMP_DONE, 1, 5 * USEC_PER_SEC);
>  }
>  
>  
> @@ -805,7 +798,6 @@ static inline void miphy28lp_configure_usb3(struct miphy28lp_phy *miphy_phy)
>  
>  static inline int miphy_is_ready(struct miphy28lp_phy *miphy_phy)
>  {
> -	unsigned long finish = jiffies + 5 * HZ;
>  	u8 mask = HFC_PLL | HFC_RDY;
>  	u8 val;
>  
> @@ -816,21 +808,14 @@ static inline int miphy_is_ready(struct miphy28lp_phy *miphy_phy)
>  	if (miphy_phy->type == PHY_TYPE_SATA)
>  		mask |= PHY_RDY;
>  
> -	do {
> -		val = readb_relaxed(miphy_phy->base + MIPHY_STATUS_1);
> -		if ((val & mask) != mask)
> -			cpu_relax();
> -		else
> -			return 0;
> -	} while (!time_after_eq(jiffies, finish));
> -
> -	return -EBUSY;
> +	return readb_relaxed_poll_timeout(miphy_phy->base + MIPHY_STATUS_1,
> +					  val, (val & mask) == mask, 1,
> +					  5 * USEC_PER_SEC);
>  }
>  
>  static int miphy_osc_is_ready(struct miphy28lp_phy *miphy_phy)
>  {
>  	struct miphy28lp_dev *miphy_dev = miphy_phy->phydev;
> -	unsigned long finish = jiffies + 5 * HZ;
>  	u32 val;
>  
>  	if (!miphy_phy->osc_rdy)
> @@ -839,17 +824,10 @@ static int miphy_osc_is_ready(struct miphy28lp_phy *miphy_phy)
>  	if (!miphy_phy->syscfg_reg[SYSCFG_STATUS])
>  		return -EINVAL;
>  
> -	do {
> -		regmap_read(miphy_dev->regmap,
> -				miphy_phy->syscfg_reg[SYSCFG_STATUS], &val);
> -
> -		if ((val & MIPHY_OSC_RDY) != MIPHY_OSC_RDY)
> -			cpu_relax();
> -		else
> -			return 0;
> -	} while (!time_after_eq(jiffies, finish));
> -
> -	return -EBUSY;
> +	return regmap_read_poll_timeout(miphy_dev->regmap,
> +					miphy_phy->syscfg_reg[SYSCFG_STATUS],
> +					val, val & MIPHY_OSC_RDY, 1,
> +					5 * USEC_PER_SEC);
>  }
>  
>  static int miphy28lp_get_resource_byname(struct device_node *child,

Reviewed-by: Patrice Chotard <patrice.chotard@...s.st.com>

Thanks
Patrice