From b39f9485e6cfe1bf21b18b60fd8c631a72a1304d Mon Sep 17 00:00:00 2001 From: Benjamin Herrenschmidt Date: Mon, 12 Dec 2005 13:13:24 +1100 Subject: [PATCH] powerpc: Fix clock spreading setting on some powermacs The code that sets the clock spreading feature of the Intrepid ASIC must not be run on some machine models or those won't boot. This fixes it. Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Paul Mackerras --- arch/ppc/platforms/pmac_feature.c | 20 +++++++++++++++----- 1 file changed, 15 insertions(+), 5 deletions(-) (limited to 'arch/ppc') diff --git a/arch/ppc/platforms/pmac_feature.c b/arch/ppc/platforms/pmac_feature.c index 1e69b0593162..6b7b3a150631 100644 --- a/arch/ppc/platforms/pmac_feature.c +++ b/arch/ppc/platforms/pmac_feature.c @@ -1606,11 +1606,19 @@ void pmac_tweak_clock_spreading(int enable) */ if (macio->type == macio_intrepid) { - if (enable) - UN_OUT(UNI_N_CLOCK_SPREADING, 2); - else - UN_OUT(UNI_N_CLOCK_SPREADING, 0); - mdelay(40); + struct device_node *clock = + of_find_node_by_path("/uni-n@f8000000/hw-clock"); + if (clock && get_property(clock, "platform-do-clockspreading", + NULL)) { + printk(KERN_INFO "%sabling clock spreading on Intrepid" + " ASIC\n", enable ? "En" : "Dis"); + if (enable) + UN_OUT(UNI_N_CLOCK_SPREADING, 2); + else + UN_OUT(UNI_N_CLOCK_SPREADING, 0); + mdelay(40); + } + of_node_put(clock); } while (machine_is_compatible("PowerBook5,2") || @@ -1680,6 +1688,8 @@ void pmac_tweak_clock_spreading(int enable) pmac_low_i2c_close(ui2c); break; } + printk(KERN_INFO "%sabling clock spreading on i2c clock chip\n", + enable ? "En" : "Dis"); pmac_low_i2c_setmode(ui2c, pmac_low_i2c_mode_stdsub); rc = pmac_low_i2c_xfer(ui2c, 0xd2 | pmac_low_i2c_write, 0x80, buffer, 9); DBG("write result: %d,", rc); -- cgit v1.2.3