linux-kernel - Re: [PATCH 2/3] [media] s5p-jpeg: Fix compilation with COMPILE

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Date:	Tue, 09 Sep 2014 16:58:58 +0200
From:	Sylwester Nawrocki <s.nawrocki@...sung.com>
To:	Mauro Carvalho Chehab <m.chehab@...sung.com>
Cc:	Linux Media Mailing List <linux-media@...r.kernel.org>,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Jacek Anaszewski <j.anaszewski@...sung.com>,
	Kamil Debski <k.debski@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-next@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH 2/3] [media] s5p-jpeg: Fix compilation with COMPILE_TEST

On 09/09/14 16:38, Mauro Carvalho Chehab wrote:
> ERROR: "__bad_ndelay" [drivers/media/platform/s5p-jpeg/s5p-jpeg.ko] undefined!
> 
> Yet, it sounds a bad idea to use ndelay to wait for 100 us
> for the device to reset.
> 
> Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
> Signed-off-by: Mauro Carvalho Chehab <m.chehab@...sung.com>
> 
> diff --git a/drivers/media/platform/s5p-jpeg/jpeg-hw-exynos4.c b/drivers/media/platform/s5p-jpeg/jpeg-hw-exynos4.c
> index e51c078360f5..01eeacf28843 100644
> --- a/drivers/media/platform/s5p-jpeg/jpeg-hw-exynos4.c
> +++ b/drivers/media/platform/s5p-jpeg/jpeg-hw-exynos4.c
> @@ -23,7 +23,9 @@ void exynos4_jpeg_sw_reset(void __iomem *base)
>  	reg = readl(base + EXYNOS4_JPEG_CNTL_REG);
>  	writel(reg & ~EXYNOS4_SOFT_RESET_HI, base + EXYNOS4_JPEG_CNTL_REG);
>  
> +#ifndef CONFIG_COMPILE_TEST
>  	ndelay(100000);
> +#endif

Wouldn't be a better fix to replace ndelay(100000); with udelay(100),
rather than sticking in a not so pretty #ifndef ?

I guess usleep_range() couldn't simply be used, since
exynos4_jpeg_sw_reset() is called with a spinlock held.

--
Regards,
Sylwester
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