From: Mehnert, Torsten Date: Mon, 1 Aug 2011 08:02:07 +0000 (+0000) Subject: i.MX25 GPT clock fix: ensure correct the clock source X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=2012d9ca2a1381ae3e733330a7f0d1d2f1988bba;p=openwrt%2Fstaging%2Fblogic.git 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 --- 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;