[PATCH] ARM: multi_v7_defconfig: fix failure setting CPU voltage by enabling dependent I2C controller
kgene.kim at samsung.com
Tue Nov 18 23:49:53 PST 2014
On 11/19/14 04:10, Tyler Baker wrote:
+ Arnd, Olof and Kevin
> This patch fixes a long standing issue introduced during the 3.16 merge window.
> Shortly after the merge, exynos5250-based arndale boards began to produce the
> following errors:
> kern.err kernel: exynos-cpufreq exynos-cpufreq: failed to set cpu voltage
> kern.err kernel: cpufreq: __target_index: Failed to change cpu frequency: -22
> Further analysis revealed that the S5M8767 voltage regulator used on the
> exynos5250-based arndale board utilizes the S3C2410 I2C controller. If the
> S3C2410 I2C controller driver is not enabled, the S5M8767 voltage regulator
> fails to probe. Therefore a dependency exists between these two drivers.
> In the exynos_defconfig both CONFIG_REGULATOR_S5M8767 and CONFIG_I2C_S3C2410
> options are enabled, and no errors are produced. However, in the
> multi_v7_defconfig only the CONFIG_REGULATOR_S5M8767 option is enabled and the
> errors are present. So let's enable the CONFIG_I2C_S3C2410 option in the
> multi_v7_defconfig to allow the S5M8767 voltage regulator to probe.
> Signed-off-by: Tyler Baker <tyler.baker at linaro.org>
Acked-by: Kukjin Kim <kgene.kim at samsung.com>
> This issue was reported . I've also confirmed this fix on two different
> arndale boards.
>  https://firstname.lastname@example.org/msg38765.html
> arch/arm/configs/multi_v7_defconfig | 1 +
> 1 file changed, 1 insertion(+)
> diff --git a/arch/arm/configs/multi_v7_defconfig b/arch/arm/configs/multi_v7_defconfig
> index 3487046..9d7a32f 100644
> --- a/arch/arm/configs/multi_v7_defconfig
> +++ b/arch/arm/configs/multi_v7_defconfig
> @@ -217,6 +217,7 @@ CONFIG_I2C_CADENCE=y
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