From mboxrd@z Thu Jan 1 00:00:00 1970 From: shawn.guo@linaro.org (Shawn Guo) Date: Fri, 1 Nov 2013 17:02:23 +0800 Subject: [PATCH 1/3] ARM: imx: add sleep for pllv3 relock In-Reply-To: <1383296545-18652-1-git-send-email-shawn.guo@linaro.org> References: <1383296545-18652-1-git-send-email-shawn.guo@linaro.org> Message-ID: <1383296545-18652-2-git-send-email-shawn.guo@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org The pllv3 relock time varies in the range of 50us ~ 500us, depending on the specific PLL type, e.g. 50us for ARM PLL and 450us for Audio/Video PLL. Let's add a usleep_range() call instead of doing busy wait during relock. Signed-off-by: Shawn Guo --- arch/arm/mach-imx/clk-pllv3.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm/mach-imx/clk-pllv3.c b/arch/arm/mach-imx/clk-pllv3.c index f6640b6..c9ca191 100644 --- a/arch/arm/mach-imx/clk-pllv3.c +++ b/arch/arm/mach-imx/clk-pllv3.c @@ -12,6 +12,7 @@ #include #include +#include #include #include #include @@ -66,6 +67,7 @@ static int clk_pllv3_prepare(struct clk_hw *hw) break; if (time_after(jiffies, timeout)) break; + usleep_range(50, 500); } while (1); if (readl_relaxed(pll->base) & BM_PLL_LOCK) -- 1.7.9.5