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SubjectRe: [PATCH 1/2] usb: dwc2: Fix IN FIFO allocation
Hi Minas,

On Thu, 19 Dec 2019 12:34:59 +0000
Minas Harutyunyan <Minas.Harutyunyan@synopsys.com> wrote:

> On 12/19/2019 3:34 PM, John Keeping wrote:
> > On chips with fewer FIFOs than endpoints (for example RK3288 which has 9
> > endpoints, but only 6 which are cabable of input), the DPTXFSIZN
> > registers above the FIFO count may return invalid values.
> >
>
> RK3288 (rev.2.2 Mar.2017) databook says:
> - Support up to 9 device mode endpoints in addition to control endpoint 0
> - Support up to 6 device mode IN endpoints including control endpoint 0
> - Endpoints 1/3/5/7 can be used only as data IN endpoint
> - Endpoints 2/4/6 can be used only as data OUT endpoint
> - Endpoints 8/9 can be used as data OUT and IN endpoint
>
> 6 IN EP's (incl.EP0) mean that TxFIFO count should be 5. For EP0 using
> NPTXFIFO. On other hand 6 EP's 1/3/5/7/8/9 are IN endpoints.

I think this is from the RK3288 Datasheet. I also have the RK3288
Technical Reference Manual Revision 2.0 Feb 2014, which is older, but
says:

- 9 Device mode endpoints in addition to control endpoint 0, 4 in, 3 out
and 2 IN/OUT

This matches what I'm seeing on the hardware.

> Something not clear to me. Could you please provide me your HSOTG core's
> GHWCFG1-4 registers values.

Here are the configuration registers:

GHWCFG1 = 0x00006664
GHWCFG2 = 0x228e2450
GHWCFG3 = 0x03cc90e8
GHWCFG4 = 0xdbf04030

> One more stuff. You didn't send patch series cover letter ([PATCH 0/2])
> or I didn't received it?

I didn't send a cover letter, it would mostly have repeated the commit
message from this patch.


Regards,
John

> > With logging added on startup, I see:
> >
> > dwc2 ff580000.usb: dwc2_hsotg_init_fifo: ep=1 sz=256
> > dwc2 ff580000.usb: dwc2_hsotg_init_fifo: ep=2 sz=128
> > dwc2 ff580000.usb: dwc2_hsotg_init_fifo: ep=3 sz=128
> > dwc2 ff580000.usb: dwc2_hsotg_init_fifo: ep=4 sz=64
> > dwc2 ff580000.usb: dwc2_hsotg_init_fifo: ep=5 sz=64
> > dwc2 ff580000.usb: dwc2_hsotg_init_fifo: ep=6 sz=32
> > dwc2 ff580000.usb: dwc2_hsotg_init_fifo: ep=7 sz=0
> > dwc2 ff580000.usb: dwc2_hsotg_init_fifo: ep=8 sz=0
> > dwc2 ff580000.usb: dwc2_hsotg_init_fifo: ep=9 sz=0
> > dwc2 ff580000.usb: dwc2_hsotg_init_fifo: ep=10 sz=0
> > dwc2 ff580000.usb: dwc2_hsotg_init_fifo: ep=11 sz=0
> > dwc2 ff580000.usb: dwc2_hsotg_init_fifo: ep=12 sz=0
> > dwc2 ff580000.usb: dwc2_hsotg_init_fifo: ep=13 sz=0
> > dwc2 ff580000.usb: dwc2_hsotg_init_fifo: ep=14 sz=0
> > dwc2 ff580000.usb: dwc2_hsotg_init_fifo: ep=15 sz=0
> >
> > but:
> >
> > # cat /sys/kernel/debug/ff580000.usb/fifo
> > Non-periodic FIFOs:
> > RXFIFO: Size 275
> > NPTXFIFO: Size 16, Start 0x00000113
> >
> > Periodic TXFIFOs:
> > DPTXFIFO 1: Size 256, Start 0x00000123
> > DPTXFIFO 2: Size 128, Start 0x00000223
> > DPTXFIFO 3: Size 128, Start 0x000002a3
> > DPTXFIFO 4: Size 64, Start 0x00000323
> > DPTXFIFO 5: Size 64, Start 0x00000363
> > DPTXFIFO 6: Size 32, Start 0x000003a3
> > DPTXFIFO 7: Size 0, Start 0x000003e3
> > DPTXFIFO 8: Size 0, Start 0x000003a3
> > DPTXFIFO 9: Size 256, Start 0x00000123
> >
> > so it seems that FIFO 9 is mirroring FIFO 1.
> >
> > Fix the allocation by using the FIFO count instead of the endpoint count
> > when selecting a FIFO for an endpoint.
> >
> > Signed-off-by: John Keeping <john@metanate.com>
> > ---
> > drivers/usb/dwc2/gadget.c | 3 ++-
> > 1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
> > index 92e8de9cb45c..911b950ef25e 100644
> > --- a/drivers/usb/dwc2/gadget.c
> > +++ b/drivers/usb/dwc2/gadget.c
> > @@ -4059,11 +4059,12 @@ static int dwc2_hsotg_ep_enable(struct usb_ep *ep,
> > * a unique tx-fifo even if it is non-periodic.
> > */
> > if (dir_in && hsotg->dedicated_fifos) {
> > + unsigned fifo_count = dwc2_hsotg_tx_fifo_count(hsotg);
> > u32 fifo_index = 0;
> > u32 fifo_size = UINT_MAX;
> >
> > size = hs_ep->ep.maxpacket * hs_ep->mc;
> > - for (i = 1; i < hsotg->num_of_eps; ++i) {
> > + for (i = 1; i <= fifo_count; ++i) {
> > if (hsotg->fifo_map & (1 << i))
> > continue;
> > val = dwc2_readl(hsotg, DPTXFSIZN(i));
> >

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