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| author | Eric Bénard <eric@eukrea.com> | 2010-10-12 19:26:34 +0200 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2010-10-19 18:44:58 +0200 |
| commit | e482b3bee66d627356904746c217f8f1bf891e60 (patch) | |
| tree | 9c6fa60278728972b160a95a014c24e4d7d92697 | |
| parent | 6136a6ddc9db50d909344bb7e6f45dbe631f2e29 (diff) | |
| download | lwn-e482b3bee66d627356904746c217f8f1bf891e60.tar.gz lwn-e482b3bee66d627356904746c217f8f1bf891e60.zip | |
mx25: fix clock's calculation
* 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 <eric@eukrea.com>
| -rw-r--r-- | arch/arm/mach-mx25/clock.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/arm/mach-mx25/clock.c b/arch/arm/mach-mx25/clock.c index 2179713873c2..9e4a5578c2fb 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) \ { \ |