linux/drivers/usb/musb
Sebastian Andrzej Siewior a655f481d8 usb: musb: musb_cppi41: handle pre-mature TX complete interrupt
The TX-complete interrupt of the CPPI41 on AM335x fires too early.
Adding a loop and counting how long it takes until the
MUSB_TXCSR_TXPKTRDY bit is cleared I see
FS:
|musb-hdrc musb-hdrc.0.auto: configure ep1/80 packet_sz=64, mode=0, dma_addr=0xadc54002, len=1514 is_tx=1
|cppi41_dma_callback() 74 loops
|musb-hdrc musb-hdrc.0.auto: configure ep1/80 packet_sz=64, mode=0, dma_addr=0xadcd8802, len=1514 is_tx=1
|cppi41_dma_callback() 66 loops
|musb-hdrc musb-hdrc.0.auto: configure ep1/80 packet_sz=64, mode=0, dma_addr=0xadcd8002, len=1514 is_tx=1
|cppi41_dma_callback() 136 loops
|musb-hdrc musb-hdrc.0.auto: configure ep1/80 packet_sz=64, mode=0, dma_addr=0xadf55802, len=1514 is_tx=1
|cppi41_dma_callback() 136 loops

avg: 110 - 150us

HS:
|musb-hdrc musb-hdrc.0.auto: configure ep1/80 packet_sz=512, mode=0, dma_addr=0xaca6f002, len=1514 is_tx=1
|cppi41_dma_callback() 0 loops
|musb-hdrc musb-hdrc.0.auto: configure ep1/80 packet_sz=512, mode=0, dma_addr=0xadd6f802, len=1514 is_tx=1
|cppi41_dma_callback() 2 loops
|musb-hdrc musb-hdrc.0.auto: configure ep1/80 packet_sz=512, mode=0, dma_addr=0xadd6f002, len=1514 is_tx=1
|cppi41_dma_callback() 13 loops

avg: 2us

for the same test case. One loop means a udelay(1). The delay seems to
depend on the packet size. On HS the bit is always cleared for small
packet sizes while on FS it is never the case, it mostly around 110us.
This testing has been performed with g_ether (musb as device) and using BULK
transfers.

INTR transfers are way more fun: during init the gadget sends a INT
packet to the host and cppi41 says "transfer done" shortly after. The
MUSB_TXCSR_TXPKTRDY bit is set even seconds later. The reason is that the host
did not try to receive it, it does so after the interface (on host side) has
been configured. Until this happens, that packet remains in musb's FIFO.

To fix this, two things are done:
- No DMA transfers for INT based endpoints. These transfer are usually
  very small and rare so it is likely better to skip the DMA engine and
  stuff the four bytes directly into the FIFO
- on HS we poll up to 25us and hope that bit goes away. If not we setup
  a hrtimer to poll for it. The 140us delay is a rule of thumb. In FS
  the command
  | ping 10.10.10.10 -c1 -s65130
  creates about 44 1514bytes transfers. About 19 of them need a second
  timer to complete.

Reported-by: Bin Liu <b-liu@ti.com>
Cc: stable@vger.kernel.org
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-11-25 10:54:14 -06:00
..
am35x.c usb: musb: am35x: use SIMPLE_DEV_PM_OPS 2013-10-02 08:21:23 -05:00
blackfin.c usb: musb: blackfin: use SIMPLE_DEV_PM_OPS 2013-10-02 08:21:55 -05:00
blackfin.h usb: musb: drop a gigantic amount of ifdeferry 2011-07-01 14:31:10 -07:00
cppi_dma.c usb: musb: dma: merge ->start/stop into create/destroy 2013-07-29 13:53:18 +03:00
cppi_dma.h
da8xx.c usb: musb: use platform_device_register_full() to avoid directly messing with dma masks 2013-10-01 09:31:19 -05:00
davinci.c usb: musb: davinci: fix resources passed to MUSB driver for DM6467 2013-10-01 09:44:01 -05:00
davinci.h usb: musb: davinci: Fix build breakage 2012-06-04 18:29:42 +03:00
Kconfig usb: patches for v3.13 2013-10-24 16:18:40 +01:00
Makefile usb: musb dma: add cppi41 dma driver 2013-08-09 17:40:16 +03:00
musb_am335x.c usb: musb_am335x: Remove redundant of_match_ptr 2013-10-04 09:25:11 -05:00
musb_core.c usb: patches for v3.13 2013-10-24 16:18:40 +01:00
musb_core.h Merge 3.12-rc6 into usb-next. 2013-10-19 13:19:07 -07:00
musb_cppi41.c usb: musb: musb_cppi41: handle pre-mature TX complete interrupt 2013-11-25 10:54:14 -06:00
musb_debug.h usb: musb: remove extern qualifier from musb_debug.h header 2011-12-21 13:21:02 +02:00
musb_debugfs.c usb: remove use of __devinit 2012-11-21 13:27:16 -08:00
musb_dma.h usb: musb dma: add cppi41 dma driver 2013-08-09 17:40:16 +03:00
musb_dsps.c usb: patches for v3.13 2013-10-24 16:18:40 +01:00
musb_gadget_ep0.c usb: musb: gadget: read ep0 fifo only if rxcount is non zero 2013-04-02 11:42:50 +03:00
musb_gadget.c usb: fix musb gadget to enable OTG mode conditionally 2013-11-25 10:25:58 -06:00
musb_gadget.h usb: musb: add Kconfig options for HOST, GAGDET or DUAL_ROLE modes 2013-05-28 19:22:23 +03:00
musb_host.c usb: Remove unnecessary semicolons 2013-10-11 16:26:46 -07:00
musb_host.h usb: patches for v3.11 merge window 2013-06-12 14:44:13 -07:00
musb_io.h usb: musb: use io{read,write}*_rep accessors 2012-12-17 17:15:13 -08:00
musb_regs.h usb: musb: tusb6010: fix compilation 2011-08-12 11:52:50 +03:00
musb_virthub.c usb: patches for v3.13 2013-10-24 16:18:40 +01:00
musbhsdma.c usb: musb: dma: merge ->start/stop into create/destroy 2013-07-29 13:53:18 +03:00
musbhsdma.h usb: musb: remove generic_interrupt 2012-11-06 15:32:13 +02:00
omap2430.c usb: patches for v3.13 2013-10-24 16:18:40 +01:00
omap2430.h usb: start using the control module driver 2013-01-25 12:27:24 +02:00
tusb6010_omap.c usb: musb: dma: merge ->start/stop into create/destroy 2013-07-29 13:53:18 +03:00
tusb6010.c usb: musb: use platform_device_register_full() to avoid directly messing with dma masks 2013-10-01 09:31:19 -05:00
tusb6010.h
ux500_dma.c usb: musb: ux500: Add check for NULL board data 2013-08-27 15:05:39 -05:00
ux500.c ARM: SoC DT updates for 3.13 2013-11-11 17:34:56 +09:00