linux-kernel - Re: [PATCH] omap: use usleep_range() instead of mdelay()/udelay()

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Date:	Tue, 03 Jan 2012 15:58:16 -0800
From:	Kevin Hilman <khilman@...com>
To:	Dmitry Antipov <dmitry.antipov@...aro.org>
Cc:	linaro-dev@...ts.linaro.org, patches@...aro.org,
	linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] omap: use usleep_range() instead of mdelay()/udelay()

Dmitry Antipov <dmitry.antipov@...aro.org> writes:

> From e4db974edb5c46360465462518a88b83f1bdedf6 Mon Sep 17 00:00:00 2001
> From: Dmitry Antipov <dmitry.antipov@...aro.org>
> Date: Wed, 21 Dec 2011 10:57:08 +0400
> Subject: [PATCH] omap: use usleep_range() instead of mdelay()/udelay()

Please include a signoff and a descriptive changelog (describing why.)

Thanks,

Kevin

> ---
>  arch/arm/mach-omap2/omap_phy_internal.c |    2 +-
>  arch/arm/mach-omap2/vc.c                |    2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm/mach-omap2/omap_phy_internal.c b/arch/arm/mach-omap2/omap_phy_internal.c
> index 58775e3..e5dff64 100644
> --- a/arch/arm/mach-omap2/omap_phy_internal.c
> +++ b/arch/arm/mach-omap2/omap_phy_internal.c
> @@ -145,7 +145,7 @@ int omap4430_phy_suspend(struct device *dev, int suspend)
>  		/* power on the phy */
>  		if (__raw_readl(ctrl_base + CONTROL_DEV_CONF) & PHY_PD) {
>  			__raw_writel(~PHY_PD, ctrl_base + CONTROL_DEV_CONF);
> -			mdelay(200);
> +			usleep_range(200000, 201000);
>  		}
>
>  		/* restore the context */
> diff --git a/arch/arm/mach-omap2/vc.c b/arch/arm/mach-omap2/vc.c
> index 031d116..57f44d5 100644
> --- a/arch/arm/mach-omap2/vc.c
> +++ b/arch/arm/mach-omap2/vc.c
> @@ -151,7 +151,7 @@ void omap_vc_post_scale(struct voltagedomain *voltdm,
>  	/* SMPS slew rate / step size. 2us added as buffer. */
>  	smps_delay = ((smps_steps * voltdm->pmic->step_size) /
>  			voltdm->pmic->slew_rate) + 2;
> -	udelay(smps_delay);
> +	usleep_range(smps_delay, smps_delay + 10);
>  }
>
>  /* vc_bypass_scale - VC bypass method of voltage scaling */
--
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