Hi Mika,
On Mon, May 02, 2022 at 01:09:41PM +0300, Mika Westerberg wrote:
> On Sun, May 01, 2022 at 11:33:21PM +0300, Gil Fine wrote:
> > Here we configure TMU mode to Hifi-Uni once DP tunnel is created.
>
> DisplayPort (at least use that in the $subject).
>
> > This is due to accuracy requirement for DP tunneling as appears in
> > CM guide 1.0, section 7.3.2
> > Due to Intel HW limitation, once we changed the TMU mode to Hifi-Uni
>
> HW -> hardware
>
> HiFi uni-directional
>
> > (when DP is tunnel exists), we don't change TMU mode back to Normal-Uni,
>
> normal un-idirectional
>
> > even if DP tunnel is teared-down later.
>
> torn down
I will fix in v2 patch.
>
> >
> > Signed-off-by: Gil Fine <gil.fine@xxxxxxxxx>
> > ---
> > drivers/thunderbolt/tb.c | 40 ++++++++++++++++++++++++++++++++++++++++
> > 1 file changed, 40 insertions(+)
> >
> > diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c
> > index 05a084e3e9f6..efe53d221ca8 100644
> > --- a/drivers/thunderbolt/tb.c
> > +++ b/drivers/thunderbolt/tb.c
> > @@ -50,6 +50,8 @@ struct tb_hotplug_event {
> > };
> >
> > static void tb_handle_hotplug(struct work_struct *work);
> > +static int tb_enable_tmu_1st_child(struct tb *tb,
> > + enum tb_switch_tmu_rate rate);
> >
> > static void tb_queue_hotplug(struct tb *tb, u64 route, u8 port, bool unplug)
> > {
> > @@ -118,6 +120,13 @@ static void tb_switch_discover_tunnels(struct tb_switch *sw,
> > switch (port->config.type) {
> > case TB_TYPE_DP_HDMI_IN:
> > tunnel = tb_tunnel_discover_dp(tb, port, alloc_hopids);
> > + /*
> > + * In case of DP tunnel exists, change TMU mode to
> > + * HiFi for CL0s to work.
> > + */
> > + if (tunnel)
> > + tb_enable_tmu_1st_child(tb,
> > + TB_SWITCH_TMU_RATE_HIFI);
> > break;
> >
> > case TB_TYPE_PCIE_DOWN:
> > @@ -235,6 +244,31 @@ static int tb_enable_tmu(struct tb_switch *sw)
> > return tb_switch_tmu_enable(sw);
> > }
> >
> > +/*
> > + * Once a DP tunnel exists in the domain, we set the TMU mode so that
> > + * it meets the accuracy requirements and also enables CLx entry (CL0s).
> > + * We set the TMU mode of the first depth router(s) for CL0s to work.
> > + */
> > +static int tb_enable_tmu_1st_child(struct tb *tb, enum tb_switch_tmu_rate rate)
> > +{
> > + struct tb_switch *root_sw = tb->root_switch;
> > + struct tb_port *port;
> > +
> > + tb_switch_for_each_port(root_sw, port) {
>
> Can't you use device_for_each_child() here?
Yes sure,I wasn't aware of it, will do in v2 patch.
>
> > + struct tb_switch *sw;
> > + int ret;
> > +
> > + if (!tb_port_has_remote(port) || !tb_port_is_null(port))
> > + continue;
> > + sw = port->remote->sw;
> > + tb_switch_tmu_configure(sw, rate, tb_switch_is_clx_enabled(sw));
> > + if (tb_switch_tmu_enable(sw))
> > + tb_dbg(tb, "Fail switching TMU to HiFi for 1st depth router %d\n", ret);
> > + }
> > +
> > + return 0;
> > +}
> > +
> > /**
> > * tb_find_unused_port() - return the first inactive port on @sw
> > * @sw: Switch to find the port on
> > @@ -981,6 +1015,12 @@ static void tb_tunnel_dp(struct tb *tb)
> >
> > list_add_tail(&tunnel->list, &tcm->tunnel_list);
> > tb_reclaim_usb3_bandwidth(tb, in, out);
> > + /*
> > + * In case of DP tunnel exists, change TMU mode to
> > + * HiFi for CL0s to work.
> > + */
> > + tb_enable_tmu_1st_child(tb, TB_SWITCH_TMU_RATE_HIFI);
> > +
> > return;
> >
> > err_free:
> > --
> > 2.17.1
--
Thanks,
Gil
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