[Skiboot-stable] [PATCH 2/2] hw/phb4.c: limit the max-link-speed of Mowgli's phb0 to gen3

[Oliver O'Halloran]

On Wed, Oct 28, 2020 at 9:50 PM Lulu Su <Lulu_Su at wistron.com> wrote:
>
> From: LuluTHSu <Lulu_Su at wistron.com>
>
> Add a condition in phb4_get_max_link_speed(),
> when it's mowgli's phb0, max-link-speed is set to gen3.
> For mowgli platform spec.
>
> Cc: skiboot-stable at lists.ozlabs.org
> Signed-off-by: LuluTHSu <Lulu_Su at wistron.com>
> ---
>  hw/phb4.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/hw/phb4.c b/hw/phb4.c
> index 17a233f..ef6b176 100644
> --- a/hw/phb4.c
> +++ b/hw/phb4.c
> @@ -2966,6 +2966,10 @@ static unsigned int phb4_get_max_link_speed(struct phb4 *p, struct dt_node *np)
>
>         /* Priority order: NVRAM -> dt -> GEN3 dd2.00 -> GEN4 */
>         max_link_speed = 4;
> +       if(dt_node_is_compatible(dt_root,"ibm,mowgli") && p->pec==0){

This sort of hack shouldn't be done in the platform independent parts
of skiboot. If that's not currently possible then implement the
infrastructure required to make it doable from the platform file.

> +               max_link_speed = 3;
> +               prlog(PR_DEBUG, "Set the max link speed of Mowgli phb0 to gen3\n");
> +       }
>         if (p->rev == PHB4_REV_NIMBUS_DD20 &&
>             ((0xf & chip->ec_level) == 0) && chip->ec_rev == 0)
>                 max_link_speed = 3;
> --
> 2.7.4
>
>
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