From e482b3bee66d627356904746c217f8f1bf891e60 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Eric=20B=C3=A9nard?= Date: Tue, 12 Oct 2010 19:26:34 +0200 Subject: mx25: fix clock's calculation MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit * get_rate_arm : when 400MHz clock is selected (cctl & 1<<14), ARM clock is 400MHz (MPLL * 3 / 4) and not 800MHz * get_rate_per : peripherals's clock is derived from AHB and not from IPG (ref manual : figure 5-1) * can2_clk : use the correct ID * without this patch, peripherals getting their clock from PER clocks work fine because of the 2 errors which fix themselves (ARM clock x 2 and per clock actually based on IPG which is AHB/2) but flexcan can't work as it gets its clock from IPG and thus calculates its bitrate using a reference value which is twice what it really is. Signed-off-by: Eric Bénard --- arch/arm/mach-mx25/clock.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'arch') diff --git a/arch/arm/mach-mx25/clock.c b/arch/arm/mach-mx25/clock.c index 2179713873c..9e4a5578c2f 100644 --- a/arch/arm/mach-mx25/clock.c +++ b/arch/arm/mach-mx25/clock.c @@ -72,7 +72,7 @@ unsigned long get_rate_arm(struct clk *clk) unsigned long rate = get_rate_mpll(); if (cctl & (1 << 14)) - rate = (rate * 3) >> 1; + rate = (rate * 3) >> 2; return rate / ((cctl >> 30) + 1); } @@ -99,7 +99,7 @@ static unsigned long get_rate_per(int per) if (readl(CRM_BASE + 0x64) & (1 << per)) fref = get_rate_upll(); else - fref = get_rate_ipg(NULL); + fref = get_rate_ahb(NULL); return fref / (val + 1); } @@ -261,7 +261,7 @@ DEFINE_CLOCK(esdhc2_clk, 1, CCM_CGCR1, 14, get_rate_esdhc2, NULL, DEFINE_CLOCK(audmux_clk, 0, CCM_CGCR1, 0, NULL, NULL, NULL); DEFINE_CLOCK(csi_clk, 0, CCM_CGCR1, 4, get_rate_csi, NULL, &csi_per_clk); DEFINE_CLOCK(can1_clk, 0, CCM_CGCR1, 2, get_rate_ipg, NULL, NULL); -DEFINE_CLOCK(can2_clk, 0, CCM_CGCR1, 3, get_rate_ipg, NULL, NULL); +DEFINE_CLOCK(can2_clk, 1, CCM_CGCR1, 3, get_rate_ipg, NULL, NULL); #define _REGISTER_CLOCK(d, n, c) \ { \ -- cgit v1.2.3