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authorKrzysztof Kozlowski <k.kozlowski@samsung.com>2014-12-05 17:15:34 +0300
committerMichael Turquette <mturquette@linaro.org>2014-12-17 18:31:51 +0300
commitf1e9203e2366164b832d8a6ce10134de8c575178 (patch)
treeb63f8a883579d364856014b7b122fb0fbc581d5f /drivers
parent83ccc4670477e7722d4654ca44b4b7004fcaada9 (diff)
downloadlinux-f1e9203e2366164b832d8a6ce10134de8c575178.tar.xz
clk: samsung: Fix Exynos 5420 pinctrl setup and clock disable failure due to domain being gated
Audio subsystem clocks are located in separate block. On Exynos 5420 if clock for this block (from main clock domain) 'mau_epll' is gated then any read or write to audss registers will block. This kind of boot hang was observed on Arndale Octa and Peach Pi/Pit after introducing runtime PM to pl330 DMA driver. After that commit the 'mau_epll' was gated, because the "amba" clock was disabled and there were no more users of mau_epll. The system hang on one of steps: 1. Disabling unused clocks from audss block. 2. During audss GPIO setup (just before probing i2s0 because samsung_pinmux_setup() tried to access memory from audss block which was gated. Add a workaround for this by enabling the 'mau_epll' clock in probe. Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Acked-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk> Tested-by: Kevin Hilman <khilman@linaro.org> Signed-off-by: Michael Turquette <mturquette@linaro.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/clk/samsung/clk-exynos-audss.c29
1 files changed, 28 insertions, 1 deletions
diff --git a/drivers/clk/samsung/clk-exynos-audss.c b/drivers/clk/samsung/clk-exynos-audss.c
index b50469faf70c..f7eff82738ab 100644
--- a/drivers/clk/samsung/clk-exynos-audss.c
+++ b/drivers/clk/samsung/clk-exynos-audss.c
@@ -29,6 +29,13 @@ static DEFINE_SPINLOCK(lock);
static struct clk **clk_table;
static void __iomem *reg_base;
static struct clk_onecell_data clk_data;
+/*
+ * On Exynos5420 this will be a clock which has to be enabled before any
+ * access to audss registers. Typically a child of EPLL.
+ *
+ * On other platforms this will be -ENODEV.
+ */
+static struct clk *epll;
#define ASS_CLK_SRC 0x0
#define ASS_CLK_DIV 0x4
@@ -98,6 +105,8 @@ static int exynos_audss_clk_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "failed to map audss registers\n");
return PTR_ERR(reg_base);
}
+ /* EPLL don't have to be enabled for boards other than Exynos5420 */
+ epll = ERR_PTR(-ENODEV);
clk_table = devm_kzalloc(&pdev->dev,
sizeof(struct clk *) * EXYNOS_AUDSS_MAX_CLKS,
@@ -115,8 +124,20 @@ static int exynos_audss_clk_probe(struct platform_device *pdev)
pll_in = devm_clk_get(&pdev->dev, "pll_in");
if (!IS_ERR(pll_ref))
mout_audss_p[0] = __clk_get_name(pll_ref);
- if (!IS_ERR(pll_in))
+ if (!IS_ERR(pll_in)) {
mout_audss_p[1] = __clk_get_name(pll_in);
+
+ if (variant == TYPE_EXYNOS5420) {
+ epll = pll_in;
+
+ ret = clk_prepare_enable(epll);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "failed to prepare the epll clock\n");
+ return ret;
+ }
+ }
+ }
clk_table[EXYNOS_MOUT_AUDSS] = clk_register_mux(NULL, "mout_audss",
mout_audss_p, ARRAY_SIZE(mout_audss_p),
CLK_SET_RATE_NO_REPARENT,
@@ -203,6 +224,9 @@ unregister:
clk_unregister(clk_table[i]);
}
+ if (!IS_ERR(epll))
+ clk_disable_unprepare(epll);
+
return ret;
}
@@ -221,6 +245,9 @@ static int exynos_audss_clk_remove(struct platform_device *pdev)
clk_unregister(clk_table[i]);
}
+ if (!IS_ERR(epll))
+ clk_disable_unprepare(epll);
+
return 0;
}