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Commit 895796a8 authored by Benjamin Herrenschmidt's avatar Benjamin Herrenschmidt
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powerpc: Initialize LPCR:DPFD on power7 to a sane default 



This sets the default data stream prefetch size for operating
systems that don't set their own value in DSCR. We use 4 which
is "medium".

Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 673b189a

arch/powerpc/kernel/cpu_setup_power7.S

+7 −0
Original line number Diff line number Diff line
@@ -54,6 +54,7 @@ __init_LPCR: 
	 *

	 *   LPES = 0b01 (HSRR0/1 used for 0x500)

	 *   PECE = 0b111

	 *   DPFD = 4

	 *

	 * Other bits untouched for now

	 */
@@ -61,6 +62,12 @@ __init_LPCR: 
	ori	r3,r3,(LPCR_LPES0|LPCR_LPES1)

	xori	r3,r3, LPCR_LPES0

	ori	r3,r3,(LPCR_PECE0|LPCR_PECE1|LPCR_PECE2)

	li	r5,7

	sldi	r5,r5,LPCR_DPFD_SH

	andc	r3,r3,r5

	li	r5,4

	sldi	r5,r5,LPCR_DPFD_SH

	or	r3,r3,r5

	mtspr	SPRN_LPCR,r3

	isync

	blr