The ast2600 machines do not have PSCI firmware, so this property should
have never been set. Removing this node fixes SMP booting Linux kernels
that have PSCI enabled, as Linux fails to find PSCI in the device tree
and falls back to the soc-specific method for enabling secondary CPUs.

The comment is out of date as Qemu has supported -kernel booting since
9bb6d14081ce ("aspeed: Add boot stub for smp booting"), in v5.1.

Fixes: f25c0ae1079d ("aspeed/soc: Add AST2600 support")
Signed-off-by: Joel Stanley <joel@jms.id.au>
---
 hw/arm/aspeed_ast2600.c | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/hw/arm/aspeed_ast2600.c b/hw/arm/aspeed_ast2600.c
index bf31ca351feb..49b00763864c 100644
--- a/hw/arm/aspeed_ast2600.c
+++ b/hw/arm/aspeed_ast2600.c
@@ -241,8 +241,6 @@ static void aspeed_soc_ast2600_realize(DeviceState *dev, Error **errp)
 
     /* CPU */
     for (i = 0; i < sc->num_cpus; i++) {
-        object_property_set_int(OBJECT(&s->cpu[i]), "psci-conduit",
-                                QEMU_PSCI_CONDUIT_SMC, &error_abort);
         if (sc->num_cpus > 1) {
             object_property_set_int(OBJECT(&s->cpu[i]), "reset-cbar",
                                     ASPEED_A7MPCORE_ADDR, &error_abort);
@@ -253,11 +251,6 @@ static void aspeed_soc_ast2600_realize(DeviceState *dev, Error **errp)
         object_property_set_int(OBJECT(&s->cpu[i]), "cntfrq", 1125000000,
                                 &error_abort);
 
-        /*
-         * TODO: the secondary CPUs are started and a boot helper
-         * is needed when using -kernel
-         */
-
         if (!qdev_realize(DEVICE(&s->cpu[i]), NULL, errp)) {
             return;
         }
-- 
2.30.1

On 3/3/21 2:05 AM, Joel Stanley wrote:
> The ast2600 machines do not have PSCI firmware, so this property should
> have never been set. Removing this node fixes SMP booting Linux kernels
> that have PSCI enabled, as Linux fails to find PSCI in the device tree
> and falls back to the soc-specific method for enabling secondary CPUs.
> 
> The comment is out of date as Qemu has supported -kernel booting since
> 9bb6d14081ce ("aspeed: Add boot stub for smp booting"), in v5.1.
> 
> Fixes: f25c0ae1079d ("aspeed/soc: Add AST2600 support")
> Signed-off-by: Joel Stanley <joel@jms.id.au>

Reviewed-by: Cédric Le Goater <clg@kaod.org>
Tested-by: Cédric Le Goater <clg@kaod.org>

Thanks

C.

> ---
>  hw/arm/aspeed_ast2600.c | 7 -------
>  1 file changed, 7 deletions(-)
> 
> diff --git a/hw/arm/aspeed_ast2600.c b/hw/arm/aspeed_ast2600.c
> index bf31ca351feb..49b00763864c 100644
> --- a/hw/arm/aspeed_ast2600.c
> +++ b/hw/arm/aspeed_ast2600.c
> @@ -241,8 +241,6 @@ static void aspeed_soc_ast2600_realize(DeviceState *dev, Error **errp)
>  
>      /* CPU */
>      for (i = 0; i < sc->num_cpus; i++) {
> -        object_property_set_int(OBJECT(&s->cpu[i]), "psci-conduit",
> -                                QEMU_PSCI_CONDUIT_SMC, &error_abort);
>          if (sc->num_cpus > 1) {
>              object_property_set_int(OBJECT(&s->cpu[i]), "reset-cbar",
>                                      ASPEED_A7MPCORE_ADDR, &error_abort);
> @@ -253,11 +251,6 @@ static void aspeed_soc_ast2600_realize(DeviceState *dev, Error **errp)
>          object_property_set_int(OBJECT(&s->cpu[i]), "cntfrq", 1125000000,
>                                  &error_abort);
>  
> -        /*
> -         * TODO: the secondary CPUs are started and a boot helper
> -         * is needed when using -kernel
> -         */
> -
>          if (!qdev_realize(DEVICE(&s->cpu[i]), NULL, errp)) {
>              return;
>          }
>