On 7/31/20 2:05 AM, Thomas Bogendoerfer wrote: > On Thu, Jul 30, 2020 at 09:24:01PM -0700, Florian Fainelli wrote: >> Disable pref 30 by utilizing the standard quirk method and matching the >> affected SoCs: 7344, 7346, 7425. >> >> Signed-off-by: Florian Fainelli <[email protected]> >> --- >> arch/mips/bmips/setup.c | 17 +++++++++++++++++ >> 1 file changed, 17 insertions(+) >> >> diff --git a/arch/mips/bmips/setup.c b/arch/mips/bmips/setup.c >> index 19308df5f577..df0efea12611 100644 >> --- a/arch/mips/bmips/setup.c >> +++ b/arch/mips/bmips/setup.c >> @@ -110,6 +110,20 @@ static void bcm6368_quirks(void) >> bcm63xx_fixup_cpu1(); >> } >> >> +static void bmips5000_pref30_quirk(void) >> +{ >> + __asm__ __volatile__( >> + " li $8, 0x5a455048\n" >> + " .word 0x4088b00f\n" /* mtc0 $8, $22, 15 */ >> + " nop; nop; nop\n" >> + " .word 0x4008b008\n" /* mfc0 $8, $22, 8 */ >> + /* disable "pref 30" on buggy CPUs */ >> + " lui $9, 0x0800\n" >> + " or $8, $9\n" >> + " .word 0x4088b008\n" /* mtc0 $8, $22, 8 */ >> + : : : "$8", "$9"); > > what's the reason for not using mfc/mtc here ?
See my response to Jiaxun, thanks! -- Florian
