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| author | Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> | 2015-03-27 17:27:10 +0100 |
|---|---|---|
| committer | Michael Turquette <mturquette@linaro.org> | 2015-04-12 20:58:54 -0700 |
| commit | 3a9e9cb65be84d6c64fbe9c69a73c15d59f29454 (patch) | |
| tree | baebf33f5a21848fb0bf9ad5727f73826e4ca288 /drivers/clk | |
| parent | 692d8328e8c039f9497eb862c6cf835de922c061 (diff) | |
| download | linux-stable-3a9e9cb65be84d6c64fbe9c69a73c15d59f29454.tar.gz linux-stable-3a9e9cb65be84d6c64fbe9c69a73c15d59f29454.tar.bz2 linux-stable-3a9e9cb65be84d6c64fbe9c69a73c15d59f29454.zip | |
clk: samsung: exynos4: Disable ARMCLK down feature on Exynos4210 SoC
Commit 42773b28e71d ("clk: samsung: exynos4: Enable ARMCLK
down feature") enabled ARMCLK down feature on all Exynos4
SoCs. Unfortunately on Exynos4210 SoC ARMCLK down feature
causes a lockup when ondemand cpufreq governor is used.
Fix it by limiting ARMCLK down feature to Exynos4x12 SoCs.
This patch was tested on:
- Exynos4210 SoC based Trats board
- Exynos4210 SoC based Origen board
- Exynos4412 SoC based Trats2 board
- Exynos4412 SoC based Odroid-U3 board
Cc: Daniel Drake <drake@endlessm.com>
Cc: Tomasz Figa <t.figa@samsung.com>
Cc: Kukjin Kim <kgene@kernel.org>
Fixes: 42773b28e71d ("clk: samsung: exynos4: Enable ARMCLK down feature")
Cc: <stable@vger.kernel.org> # v3.17+
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Michael Turquette <mturquette@linaro.org>
Diffstat (limited to 'drivers/clk')
| -rw-r--r-- | drivers/clk/samsung/clk-exynos4.c | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/drivers/clk/samsung/clk-exynos4.c b/drivers/clk/samsung/clk-exynos4.c index 51462e85675f..714d6ba782c8 100644 --- a/drivers/clk/samsung/clk-exynos4.c +++ b/drivers/clk/samsung/clk-exynos4.c @@ -1354,7 +1354,7 @@ static struct samsung_pll_clock exynos4x12_plls[nr_plls] __initdata = { VPLL_LOCK, VPLL_CON0, NULL), }; -static void __init exynos4_core_down_clock(enum exynos4_soc soc) +static void __init exynos4x12_core_down_clock(void) { unsigned int tmp; @@ -1373,11 +1373,9 @@ static void __init exynos4_core_down_clock(enum exynos4_soc soc) __raw_writel(tmp, reg_base + PWR_CTRL1); /* - * Disable the clock up feature on Exynos4x12, in case it was - * enabled by bootloader. + * Disable the clock up feature in case it was enabled by bootloader. */ - if (exynos4_soc == EXYNOS4X12) - __raw_writel(0x0, reg_base + E4X12_PWR_CTRL2); + __raw_writel(0x0, reg_base + E4X12_PWR_CTRL2); } /* register exynos4 clocks */ @@ -1474,7 +1472,8 @@ static void __init exynos4_clk_init(struct device_node *np, samsung_clk_register_alias(ctx, exynos4_aliases, ARRAY_SIZE(exynos4_aliases)); - exynos4_core_down_clock(soc); + if (soc == EXYNOS4X12) + exynos4x12_core_down_clock(); exynos4_clk_sleep_init(); samsung_clk_of_add_provider(np, ctx); |