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SubjectRe: [PATCH 1/2] usb: dwc2: Fix IN FIFO allocation
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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.
>
> 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>
> ---

Acked-by: Minas Harutyunyan <hminas@synopsys.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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