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

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Date:	Tue, 09 Sep 2014 17:30:25 +0200
From:	Jacek Anaszewski <j.anaszewski@...sung.com>
To:	Mauro Carvalho Chehab <m.chehab@...sung.com>
Cc:	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Linux Media Mailing List <linux-media@...r.kernel.org>,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	Kukjin Kim <kgene.kim@...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

Hi Mauro, Sylwester,

On 09/09/2014 05:09 PM, Mauro Carvalho Chehab wrote:
> Em Tue, 09 Sep 2014 16:58:58 +0200
> Sylwester Nawrocki <s.nawrocki@...sung.com> escreveu:
>
>> 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 ?
>
> Works for me. I'll submit a new version.
>
>> I guess usleep_range() couldn't simply be used, since
>> exynos4_jpeg_sw_reset() is called with a spinlock held.
>
> Ok.

Within few days I will perform some hardware tests, to verify
if there is more room for improvement here.

Best Regards,
Jacek Anaszewski
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