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linux/drivers/usb/host
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Alan Stern 87f88dfcde USB: OHCI: Remove USB bus reset delay from OHCI handover code 
Paul pointed out that the 50-ms sleep during OHCI initialization takes
up a large fraction of a system's boot time.  Things get worse when
there are two OHCI controllers present, each requiring 50 ms.

However, there really is no need to send a 50-ms reset signal out all
the root-hub ports during initialization.  The ports themselves will
be disabled, and the only way to enable a port is to reset it.
Therefore all attached USB devices will receive a proper reset in any
case.  The controller reset does not need to be long enough to reset
those other devices, so the 50-ms delay isn't necessary.

Without the delay, there is no remaining incentive for skipping the
reset when the controller is already in the RESET state.  This patch
removes the test, issuing the command unconditionally, and removes the
following delay.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Suggested-by: Paul Menzel <pmenzel@molgen.mpg.de>
Tested-by: Paul Menzel <pmenzel@molgen.mpg.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-09-10 20:05:02 +02:00
..
whci USB: host: whci: remove redundant variable t 2018-07-13 15:41:56 +02:00
bcma-hcd.c USB: host: Remove redundant license text 2017-11-07 15:45:02 +01:00
ehci-atmel.c USB: host: ehci: Remove redundant license text 2017-11-07 15:45:02 +01:00
ehci-dbg.c USB: ehci-hcd: no need to check return value of debugfs_create functions 2018-05-31 12:54:22 +02:00
ehci-exynos.c usb: host: exynos: Remove support for Exynos5440 2018-07-24 18:44:00 +02:00
ehci-fsl.c usb: add a flag to skip PHY initialization to struct usb_hcd 2018-03-09 09:43:52 -08:00
ehci-fsl.h USB: host: ehci: Remove redundant license text 2017-11-07 15:45:02 +01:00
ehci-grlib.c USB: host: ehci: Remove redundant license text 2017-11-07 15:45:02 +01:00
ehci-hcd.c USB: ehci-hcd: Add get_resuming_ports method 2018-06-25 21:44:43 +08:00
ehci-hub.c USB: ehci-hcd: Add get_resuming_ports method 2018-06-25 21:44:43 +08:00
ehci-mem.c Revert "usb: host: ehci: Use dma_pool_zalloc()" 2018-05-04 14:35:12 -07:00
ehci-mv.c USB: host: ehci: Remove redundant license text 2017-11-07 15:45:02 +01:00
ehci-mxc.c USB: host: ehci: Remove redundant license text 2017-11-07 15:45:02 +01:00
ehci-npcm7xx.c USB: host: ehci-npcm7xx: Fix some error codes in probe 2018-06-28 19:32:42 +09:00
ehci-omap.c USB: ehci-omap: drop unused legacy phy support 2018-04-22 15:58:23 +02:00
ehci-orion.c USB: host: ehci: Remove redundant license text 2017-11-07 15:45:02 +01:00
ehci-pci.c USB: host: ehci: Remove redundant license text 2017-11-07 15:45:02 +01:00
ehci-platform.c usb: host: ehci-platform: remove custom USB PHY handling 2018-03-09 09:43:53 -08:00
ehci-pmcmsp.c USB: host: ehci: Remove redundant license text 2017-11-07 15:45:02 +01:00
ehci-ppc-of.c USB: add SPDX identifiers to all remaining files in drivers/usb/ 2017-11-04 11:48:02 +01:00
ehci-ps3.c powerpc/ps3: Set driver coherent_dma_mask 2018-07-20 12:50:37 +10:00
ehci-q.c usb: host: ehci: always enable interrupt for qtd completion at test mode 2018-02-15 18:45:34 +01:00
ehci-sched.c usb: host: ehci-sched: remove redundant pointer dev 2018-07-13 15:41:56 +02:00
ehci-sh.c USB: host: ehci: Remove redundant license text 2017-11-07 15:45:02 +01:00
ehci-spear.c USB: host: ehci: Remove redundant license text 2017-11-07 15:45:02 +01:00
ehci-st.c pinctrl: files should directly include apis they use 2018-02-05 09:41:54 -08:00
ehci-sysfs.c USB: move many drivers to use DEVICE_ATTR_RW 2018-01-24 08:49:51 +01:00
ehci-tegra.c usb: tegra: Move utmi-pads reset from ehci-tegra to tegra-phy 2018-04-23 09:50:57 +02:00
ehci-timer.c USB: host: ehci: Remove redundant license text 2017-11-07 15:45:02 +01:00
ehci-w90x900.c USB: host: ehci: Remove redundant license text 2017-11-07 15:45:02 +01:00
ehci-xilinx-of.c USB: host: ehci: Remove redundant license text 2017-11-07 15:45:02 +01:00
ehci.h USB: host: ehci: Remove redundant license text 2017-11-07 15:45:02 +01:00
fhci-dbg.c USB: fhci-hcd: no need to check return value of debugfs_create functions 2018-05-31 12:54:22 +02:00
fhci-hcd.c USB: host: fhci: Remove redundant license text 2017-11-07 15:45:02 +01:00
fhci-hub.c USB: host: fhci: Remove redundant license text 2017-11-07 15:45:02 +01:00
fhci-mem.c USB: host: fhci: Remove redundant license text 2017-11-07 15:45:02 +01:00
fhci-q.c USB: host: fhci: Remove redundant license text 2017-11-07 15:45:02 +01:00
fhci-sched.c USB: host: fhci: Remove redundant license text 2017-11-07 15:45:02 +01:00
fhci-tds.c treewide: kmalloc() -> kmalloc_array() 2018-06-12 16:19:22 -07:00
fhci.h USB: fhci-hcd: no need to check return value of debugfs_create functions 2018-05-31 12:54:22 +02:00
fotg210-hcd.c usb: host: fotg2: add silicon clock handling 2018-09-10 20:03:50 +02:00
fotg210.h usb: host: fotg2: add silicon clock handling 2018-09-10 20:03:50 +02:00
fsl-mph-dr-of.c USB: host: Remove redundant license text 2017-11-07 15:45:02 +01:00
hwa-hc.c USB: host: Remove redundant license text 2017-11-07 15:45:02 +01:00
imx21-dbg.c USB: imx21-hcd: no need to check return value of debugfs_create functions 2018-05-31 12:54:22 +02:00
imx21-hcd.c treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
imx21-hcd.h USB: host: imx21: Remove redundant license text 2017-11-07 15:45:02 +01:00
isp116x-hcd.c USB: isp116x-hcd: no need to check return value of debugfs_create functions 2018-05-31 12:54:21 +02:00
isp116x.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
isp1362-hcd.c usb: host: isp1362-hcd: remove a couple of redundant assignments 2017-11-07 15:52:29 +01:00
isp1362.h usb: isp1362: remove blackfin arch glue 2018-03-26 15:57:14 +02:00
Kconfig USB host: Add USB ehci support for nuvoton npcm7xx platform 2018-06-25 21:59:15 +08:00
Makefile USB host: Add USB ehci support for nuvoton npcm7xx platform 2018-06-25 21:59:15 +08:00
max3421-hcd.c USB: add SPDX identifiers to all remaining files in drivers/usb/ 2017-11-04 11:48:02 +01:00
ohci-at91.c usb: host: ohci: fix sfr kernel warning in ohci-at91 driver 2018-05-31 12:43:15 +02:00
ohci-da8xx.c USB: ohci: da8xx: remove clk con_id 2018-01-09 16:15:19 +01:00
ohci-dbg.c treewide: kmalloc() -> kmalloc_array() 2018-06-12 16:19:22 -07:00
ohci-exynos.c usb: host: exynos: Remove support for Exynos5440 2018-07-24 18:44:00 +02:00
ohci-hcd.c USB: ohci: no need to check return value of debugfs_create functions 2018-05-31 12:54:21 +02:00
ohci-hub.c ohci-hcd: Fix race condition caused by ohci_urb_enqueue() and io_watchdog_func() 2018-02-15 18:43:57 +01:00
ohci-mem.c USB: add SPDX identifiers to all remaining files in drivers/usb/ 2017-11-04 11:48:02 +01:00
ohci-nxp.c USB: host: ohci: Remove redundant license text 2017-11-07 15:45:02 +01:00
ohci-omap.c usb: add a flag to skip PHY initialization to struct usb_hcd 2018-03-09 09:43:52 -08:00
ohci-pci.c USB: add SPDX identifiers to all remaining files in drivers/usb/ 2017-11-04 11:48:02 +01:00
ohci-platform.c usb: host: ohci-platform: remove custom USB PHY handling 2018-03-09 09:43:53 -08:00
ohci-ppc-of.c USB: add SPDX identifiers to all remaining files in drivers/usb/ 2017-11-04 11:48:02 +01:00
ohci-ps3.c powerpc/ps3: Set driver coherent_dma_mask 2018-07-20 12:50:37 +10:00
ohci-pxa27x.c USB: add SPDX identifiers to all remaining files in drivers/usb/ 2017-11-04 11:48:02 +01:00
ohci-q.c usb: ohci: Proper handling of ed_rm_list to handle race condition between usb_kill_urb() and finish_unlinks() 2018-02-15 18:45:34 +01:00
ohci-s3c2410.c USB: add SPDX identifiers to all remaining files in drivers/usb/ 2017-11-04 11:48:02 +01:00
ohci-sa1111.c USB: add SPDX identifiers to all remaining files in drivers/usb/ 2017-11-04 11:48:02 +01:00
ohci-sm501.c USB: add SPDX identifiers to all remaining files in drivers/usb/ 2017-11-04 11:48:02 +01:00
ohci-spear.c USB: host: ohci: Remove redundant license text 2017-11-07 15:45:02 +01:00
ohci-st.c USB: host: ohci: Remove redundant license text 2017-11-07 15:45:02 +01:00
ohci-tmio.c USB: host: ohci: Remove redundant license text 2017-11-07 15:45:02 +01:00
ohci.h USB: ohci: no need to check return value of debugfs_create functions 2018-05-31 12:54:21 +02:00
oxu210hp-hcd.c treewide: setup_timer() -> timer_setup() 2017-11-21 15:57:07 -08:00
oxu210hp.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pci-quirks.c USB: OHCI: Remove USB bus reset delay from OHCI handover code 2018-09-10 20:05:02 +02:00
pci-quirks.h Revert "xhci: Reset Renesas uPD72020x USB controller for 32-bit DMA issue" 2018-06-01 13:24:51 +02:00
r8a66597-hcd.c treewide: setup_timer() -> timer_setup() 2017-11-21 15:57:07 -08:00
r8a66597.h USB: host: Remove redundant license text 2017-11-07 15:45:02 +01:00
sl811_cs.c USB: add SPDX identifiers to all remaining files in drivers/usb/ 2017-11-04 11:48:02 +01:00
sl811-hcd.c USB: host: sl811: Re-use DEFINE_SHOW_ATTRIBUTE() macro 2018-03-16 15:40:19 +01:00
sl811.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ssb-hcd.c USB: host: Remove redundant license text 2017-11-07 15:45:02 +01:00
u132-hcd.c usb: host: u132-hcd: remove redundant variable num_ports 2018-07-13 15:41:56 +02:00
uhci-debug.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
uhci-grlib.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
uhci-hcd.c USB: uhci: no need to check return value of debugfs_create functions 2018-05-31 12:54:21 +02:00
uhci-hcd.h usb: uhci: Add clk support to uhci-platform 2018-01-17 15:08:56 +01:00
uhci-hub.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
uhci-pci.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
uhci-platform.c usb: uhci: Add clk support to uhci-platform 2018-01-17 15:08:56 +01:00
uhci-q.c USB: remove the URB_NO_FSBR flag 2017-12-12 13:16:07 +01:00
xhci-dbg.c usb: xhci: Cleanup printk debug message for ERST 2017-12-08 17:43:52 +01:00
xhci-dbgcap.c Merge 4.18-rc5 into usb-next 2018-07-16 09:09:24 +02:00
xhci-dbgcap.h usb: xhci: dbc: Add SPDX identifiers to dbc files 2018-05-24 18:03:07 +02:00
xhci-dbgtty.c usb: xhci: dbc: Add SPDX identifiers to dbc files 2018-05-24 18:03:07 +02:00
xhci-debugfs.c xhci: debugfs: add debugfs interface to enable compliance mode for a port 2018-05-24 18:03:09 +02:00
xhci-debugfs.h USB: host: xhci-debugfs: add SPDX lines 2017-11-07 15:53:48 +01:00
xhci-ext-caps.c xhci: Add Intel extended cap / otg phy mux handling 2018-03-22 13:40:10 +01:00
xhci-ext-caps.h xhci: Add Intel extended cap / otg phy mux handling 2018-03-22 13:40:10 +01:00
xhci-histb.c xhci: hisilicon: support HiSilicon STB xHCI host controller 2018-05-24 18:03:07 +02:00
xhci-hub.c USB: xhci-hcd: Add get_resuming_ports method 2018-06-25 21:44:43 +08:00
xhci-mem.c xhci: xhci-mem: off by one in xhci_stream_id_to_ring() 2018-07-06 16:28:31 +02:00
xhci-mtk-sch.c xhci-mtk: use xhci hub structures to get number of ports in roothubs 2018-05-24 18:03:08 +02:00
xhci-mtk.c usb: host: xhci-mtk: remove custom USB PHY handling 2018-03-09 09:43:53 -08:00
xhci-mtk.h usb: xhci-mtk: supports remote wakeup for mt2712 with two xHCI IPs 2018-01-09 16:21:28 +01:00
xhci-mvebu.c USB: host: xhci: Remove redundant license text 2017-11-07 15:45:02 +01:00
xhci-mvebu.h USB: host: xhci: Remove redundant license text 2017-11-07 15:45:02 +01:00
xhci-pci.c Revert "xhci: Reset Renesas uPD72020x USB controller for 32-bit DMA issue" 2018-06-01 13:24:51 +02:00
xhci-plat.c usb: host: xhci-plat: add firmware_name for R-Car Gen3 2018-07-06 16:37:19 +02:00
xhci-plat.h USB: host: xhci: Remove redundant license text 2017-11-07 15:45:02 +01:00
xhci-rcar.c usb: host: xhci-rcar: Add a condition check about PLL active 2018-07-06 16:37:19 +02:00
xhci-rcar.h USB: host: xhci: Remove redundant license text 2017-11-07 15:45:02 +01:00
xhci-ring.c xhci: change xhci_test_and_clear_bit() to use new port structure 2018-05-24 18:03:08 +02:00
xhci-tegra.c usb: xhci: tegra: fix runtime PM error handling 2018-06-25 21:16:27 +08:00
xhci-trace.c USB: host: xhci: Remove redundant license text 2017-11-07 15:45:02 +01:00
xhci-trace.h xhci: Fix kernel oops in trace_xhci_free_virt_device 2018-06-25 21:16:27 +08:00
xhci.c Merge 4.18-rc7 into usb-next 2018-07-30 10:04:58 +02:00
xhci.h Merge 4.18-rc3 into usb-next 2018-07-02 08:28:32 +02:00