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Commit 8d9df29d authored by Ralf Baechle's avatar Ralf Baechle
Browse files

MIPS: Sibyte: Apply M3 workaround only on affected chip types and versions. 



Previously it was unconditionally used on all Sibyte family SOCs.  The
M3 bug has to be handled in the TLB exception handler which is extremly
performance sensitive, so this modification is expected to deliver around
2-3% performance improvment.  This is important as required changes to the
M3 workaround will make it more costly.

Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 9538ca63

arch/mips/include/asm/mach-sibyte/war.h

+5 −1
Original line number Diff line number Diff line
@@ -16,7 +16,11 @@ 
#if defined(CONFIG_SB1_PASS_1_WORKAROUNDS) || \

    defined(CONFIG_SB1_PASS_2_WORKAROUNDS)



#define BCM1250_M3_WAR	1

#ifndef __ASSEMBLY__

extern int sb1250_m3_workaround_needed(void);

#endif



#define BCM1250_M3_WAR	sb1250_m3_workaround_needed()

#define SIBYTE_1956_WAR	1



#else

arch/mips/sibyte/sb1250/setup.c

+15 −0
Original line number Diff line number Diff line
@@ -87,6 +87,21 @@ static int __init setup_bcm1250(void) 
	return ret;

}



int sb1250_m3_workaround_needed(void)

{

	switch (soc_type) {

	case K_SYS_SOC_TYPE_BCM1250:

	case K_SYS_SOC_TYPE_BCM1250_ALT:

	case K_SYS_SOC_TYPE_BCM1250_ALT2:

	case K_SYS_SOC_TYPE_BCM1125:

	case K_SYS_SOC_TYPE_BCM1125H:

		return soc_pass < K_SYS_REVISION_BCM1250_C0;



	default:

		return 0;

	}

}



static int __init setup_bcm112x(void)

{

	int ret = 0;