[PATCH] powerpc: Fix clock spreading setting on some powermacs
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: 2005-12-12 02:15:10
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 <benh@kernel.crashing.org> --- This is 2.6.15 material. Index: linux-work/arch/powerpc/platforms/powermac/feature.c ===================================================================
--- linux-work.orig/arch/powerpc/platforms/powermac/feature.c 2005-11-19 10:56:07.000000000 +1100
+++ linux-work/arch/powerpc/platforms/powermac/feature.c 2005-12-12 12:17:02.000000000 +1100@@ -1650,11 +1650,19 @@ */ 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") ||
@@ -1724,6 +1732,9 @@ 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);
Index: linux-work/arch/ppc/platforms/pmac_feature.c ===================================================================
--- linux-work.orig/arch/ppc/platforms/pmac_feature.c 2005-11-14 20:32:16.000000000 +1100
+++ linux-work/arch/ppc/platforms/pmac_feature.c 2005-12-12 12:16:38.000000000 +1100@@ -1606,11 +1606,19 @@ */ 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 @@ 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);