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 <f.fainelli@xxxxxxxxx>
> ---
> 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 ?
Thomas.
--
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea. [ RFC1925, 2.3 ]
