Re: [PATCH 08/11] usb: xhci-mtk: update fs bus bandwidth by bw_budget_table

[Chunfeng Yun <chunfeng.yun@mediatek.com>]

On Tue, 2021-08-03 at 14:05 +0800, Ikjoon Jang wrote:
> Hi Chunfeng,
> 
> On Fri, Jul 30, 2021 at 4:51 PM Chunfeng Yun <chunfeng.yun@mediatek.com> wrote:
> >
> > Use @bw_budget_table[] to update fs bus bandwidth due to
> > not all microframes consume @bw_cost_per_microframe, see
> > setup_sch_info().
> >
> > Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
> > ---
> >  drivers/usb/host/xhci-mtk-sch.c | 17 +++++++----------
> >  1 file changed, 7 insertions(+), 10 deletions(-)
> >
> > diff --git a/drivers/usb/host/xhci-mtk-sch.c b/drivers/usb/host/xhci-mtk-sch.c
> > index 0bb1a6295d64..10c0f0f6461f 100644
> > --- a/drivers/usb/host/xhci-mtk-sch.c
> > +++ b/drivers/usb/host/xhci-mtk-sch.c
> > @@ -458,8 +458,8 @@ static int check_fs_bus_bw(struct mu3h_sch_ep_info *sch_ep, int offset)
> >                  * Compared with hs bus, no matter what ep type,
> >                  * the hub will always delay one uframe to send data
> >                  */
> > -               for (j = 0; j < sch_ep->cs_count; j++) {
> > -                       tmp = tt->fs_bus_bw[base + j] + sch_ep->bw_cost_per_microframe;
> > +               for (j = 0; j < sch_ep->num_budget_microframes; j++) {
> > +                       tmp = tt->fs_bus_bw[base + j] + sch_ep->bw_budget_table[j];
> >                         if (tmp > FS_PAYLOAD_MAX)
> >                                 return -ESCH_BW_OVERFLOW;
> >                 }
> > @@ -534,21 +534,18 @@ static void update_sch_tt(struct mu3h_sch_ep_info *sch_ep, bool used)
> >  {
> >         struct mu3h_sch_tt *tt = sch_ep->sch_tt;
> >         u32 base, num_esit;
> > -       int bw_updated;
> >         int i, j;
> >
> >         num_esit = XHCI_MTK_MAX_ESIT / sch_ep->esit;
> >
> > -       if (used)
> > -               bw_updated = sch_ep->bw_cost_per_microframe;
> > -       else
> > -               bw_updated = -sch_ep->bw_cost_per_microframe;
> > -
> >         for (i = 0; i < num_esit; i++) {
> >                 base = sch_ep->offset + i * sch_ep->esit;
> >
> > -               for (j = 0; j < sch_ep->cs_count; j++)
> > -                       tt->fs_bus_bw[base + j] += bw_updated;
> > +               for (j = 0; j < sch_ep->num_budget_microframes; j++)
> > +                       if (used)
> > +                               tt->fs_bus_bw[base + j] += sch_ep->bw_budget_table[j];
> > +                       else
> > +                               tt->fs_bus_bw[base + j] -= sch_ep->bw_budget_table[j];
> 
> I agree that xhci-mtk-sch still has more rooms for tt periodic bandwidth
> but I think this approach could trigger a problem.
See updat_bus_bw(), when add fs ep's bandwidth, it uses
bw_budget_table[], so prefer to use the same way

> 
> for example, if there are two endpoints scheduled in the same u-frame index,
> * ep1out  = iso 192bytes bw_budget_table[] = { 188, 188, 0, ...} --> y0
> * ep2in = int 64bytes, bw_budget_table[] = { 0, 0, 64, ... }  --> y0
> 
> (If this is possible allocation from this patch),
> I guess xhci-mtk could have some problems on internal scheduling?

Test it on dvt env. don't encounter issues;

Thanks

> 
> >         }
> >
> >         if (used)
> 
> > --
> > 2.18.0
> >