From 2012d9ca2a1381ae3e733330a7f0d1d2f1988bba Mon Sep 17 00:00:00 2001 From: "Mehnert, Torsten" Date: Mon, 1 Aug 2011 08:02:07 +0000 Subject: [PATCH] i.MX25 GPT clock fix: ensure correct the clock source Request for comment and commit. From: T. Mehnert Date: Mon, 4 Jul 2011 15:53:30 +0200 Subject: [PATCH] i.MX25 GPT clock fix: ensure correct the clock source This patch ensures, that Linux will take the correct clock source (AHB_DIV) for gpt in the ARM i.MX25 implementation. The currect code depends on the reset defaults of the CCM_MCR register. So on some boards it could happen that the UPLL is used for clock source, which results in faulty time behavior in Linux. In this case all delays or sleeps will will be faktor 1.8 too long. Signed-off-by: Torsten Mehnert Signed-off-by: Sascha Hauer --- arch/arm/mach-imx/clock-imx25.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/arm/mach-imx/clock-imx25.c b/arch/arm/mach-imx/clock-imx25.c index a65838fc061c..e40c0b320d4a 100644 --- a/arch/arm/mach-imx/clock-imx25.c +++ b/arch/arm/mach-imx/clock-imx25.c @@ -328,6 +328,9 @@ int __init mx25_clocks_init(void) __raw_writel(__raw_readl(CRM_BASE+0x64) | (1 << 7) | (1 << 0), CRM_BASE + 0x64); + /* Clock source for gpt is ahb_div */ + __raw_writel(__raw_readl(CRM_BASE+0x64) & ~(1 << 5), CRM_BASE + 0x64); + mxc_timer_init(&gpt_clk, MX25_IO_ADDRESS(MX25_GPT1_BASE_ADDR), 54); return 0; -- 2.20.1