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authorGautham R. Shenoy <ego@linux.vnet.ibm.com>2015-08-05 12:38:31 +0530
committerMichael Ellerman <mpe@ellerman.id.au>2015-08-14 15:58:28 +1000
commite63dbd16ab7be41f5b66a70f1082242d76dd21d7 (patch)
tree55996fb7acda110d3a4dd4fedb0673ed259f1607 /arch/powerpc/platforms
parent9afac933433ca71e0f78958a1286a8d3b9de5582 (diff)
downloadlinux-e63dbd16ab7be41f5b66a70f1082242d76dd21d7.tar.bz2
powerpc: Add an inline function to update POWER8 HID0
Section 3.7 of Version 1.2 of the Power8 Processor User's Manual prescribes that updates to HID0 be preceded by a SYNC instruction and followed by an ISYNC instruction (Page 91). Create an inline function name update_power8_hid0() which follows this recipe and invoke it from the static split core path. Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com> Reviewed-by: Sam Bobroff <sam.bobroff@au1.ibm.com> Tested-by: Sam Bobroff <sam.bobroff@au1.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/platforms')
-rw-r--r--arch/powerpc/platforms/powernv/subcore.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/platforms/powernv/subcore.c b/arch/powerpc/platforms/powernv/subcore.c
index f60f80ada903..503a73f59359 100644
--- a/arch/powerpc/platforms/powernv/subcore.c
+++ b/arch/powerpc/platforms/powernv/subcore.c
@@ -190,7 +190,7 @@ static void unsplit_core(void)
hid0 = mfspr(SPRN_HID0);
hid0 &= ~HID0_POWER8_DYNLPARDIS;
- mtspr(SPRN_HID0, hid0);
+ update_power8_hid0(hid0);
update_hid_in_slw(hid0);
while (mfspr(SPRN_HID0) & mask)
@@ -227,7 +227,7 @@ static void split_core(int new_mode)
/* Write new mode */
hid0 = mfspr(SPRN_HID0);
hid0 |= HID0_POWER8_DYNLPARDIS | split_parms[i].value;
- mtspr(SPRN_HID0, hid0);
+ update_power8_hid0(hid0);
update_hid_in_slw(hid0);
/* Wait for it to happen */