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SubjectRe: [PATCH] MIPS: BMIPS: Disable pref 30 for buggy CPUs
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在 2020/7/31 下午12:24, Florian Fainelli 写道:
> Disable pref 30 by utilizing the standard quirk method and matching the
> affected SoCs: 7344, 7346, 7425.
>
> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
> ---
> 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");
> +}
Hi,

Is there any toolchain issue blocking read_c0_**** family helpers being
used?

Use .word looks unreasonable.

Thanks

- Jiaxun

> +
> static const struct bmips_quirk bmips_quirk_list[] = {
> { "brcm,bcm3368", &bcm6358_quirks },
> { "brcm,bcm3384-viper", &bcm3384_viper_quirks },
> @@ -120,6 +134,9 @@ static const struct bmips_quirk bmips_quirk_list[] = {
> { "brcm,bcm6368", &bcm6368_quirks },
> { "brcm,bcm63168", &bcm6368_quirks },
> { "brcm,bcm63268", &bcm6368_quirks },
> + { "brcm,bcm7344", &bmips5000_pref30_quirk },
> + { "brcm,bcm7346", &bmips5000_pref30_quirk },
> + { "brcm,bcm7425", &bmips5000_pref30_quirk },
> { },
> };
>

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