linux-kernel - Re: [PATCH] thermal: exynos: fix register read in TMU

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Date:	Thu, 1 Oct 2015 19:42:43 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
Cc:	Lukasz Majewski <l.majewski@...sung.com>,
	Zhang Rui <rui.zhang@...el.com>,
	Eduardo Valentin <edubezval@...il.com>,
	Kukjin Kim <kgene@...nel.org>, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] thermal: exynos: fix register read in TMU

On Thu, Oct 01, 2015 at 10:18:57PM +0900, Krzysztof Kozlowski wrote:
> 2015-10-01 20:39 GMT+09:00 Sudip Mukherjee <sudipm.mukherjee@...il.com>:
> > The value of emul_con was getting overwritten if the selected soc is
> > SOC_ARCH_EXYNOS5260. And so as a result we were reading from the wrong
> > register in the case of SOC_ARCH_EXYNOS5260.
> 
> How the value is overwritten if the soc is Exynos5260? I can't see it
> (although the "else if" is still more obvious than "if" but how does
> the description match the code?).
The code here is:
if (data->soc == SOC_ARCH_EXYNOS5260)
	emul_con = EXYNOS5260_EMUL_CON;
if (data->soc == SOC_ARCH_EXYNOS5433)
	emul_con = EXYNOS5433_TMU_EMUL_CON;
else if (data->soc == SOC_ARCH_EXYNOS7)
	emul_con = EXYNOS7_TMU_REG_EMUL_CON;
else
	emul_con = EXYNOS_EMUL_CON;

So if data->soc is SOC_ARCH_EXYNOS5260 , then emul_con becomes
EXYNOS5260_EMUL_CON. But again for the else part it will become
EXYNOS_EMUL_CON.

regards
sudip
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