linux-kernel - Re: [PATCH v1] Input: tegra-kbc - fix computation of polling time

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Date:	Sat, 30 Jul 2011 12:41:01 +0200
From:	Thierry Reding <thierry.reding@...onic-design.de>
To:	riyer@...dia.com
Cc:	dmitry.torokhov@...il.com, rydberg@...omail.se, olof@...om.net,
	amartin@...dia.com, linux-kernel@...r.kernel.org,
	linux-input@...r.kernel.org
Subject: Re: [PATCH v1] Input: tegra-kbc - fix computation of polling time

* riyer@...dia.com wrote:
> From: Rakesh Iyer <riyer@...dia.com>
> 
> Fix a constant definition and computation of polling time.
> 
> Signed-off-by: Rakesh Iyer <riyer@...dia.com>
> ---
>  drivers/input/keyboard/tegra-kbc.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/input/keyboard/tegra-kbc.c b/drivers/input/keyboard/tegra-kbc.c
> index da3828f..263f6fc 100644
> --- a/drivers/input/keyboard/tegra-kbc.c
> +++ b/drivers/input/keyboard/tegra-kbc.c
> @@ -37,7 +37,7 @@
>  #define KBC_ROW_SCAN_DLY	5
>  
>  /* KBC uses a 32KHz clock so a cycle = 1/32Khz */
> -#define KBC_CYCLE_USEC	32
> +#define KBC_CYCLE_MS	32
>  
>  /* KBC Registers */
>  
> @@ -647,7 +647,7 @@ static int __devinit tegra_kbc_probe(struct platform_device *pdev)
>  	debounce_cnt = min(pdata->debounce_cnt, KBC_MAX_DEBOUNCE_CNT);
>  	scan_time_rows = (KBC_ROW_SCAN_TIME + debounce_cnt) * num_rows;
>  	kbc->repoll_dly = KBC_ROW_SCAN_DLY + scan_time_rows + pdata->repeat_cnt;
> -	kbc->repoll_dly = ((kbc->repoll_dly * KBC_CYCLE_USEC) + 999) / 1000;
> +	kbc->repoll_dly = (kbc->repoll_dly + KBC_CYCLE_MS - 1) / KBC_CYCLE_MS;

You might want to consider using DIV_ROUND_UP for this.

Thierry

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