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path: root/drivers/usb/host/ehci-hcd.c (follow)
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2014-11-25USB: host: Remove ehci-octeon and ohci-octeon driversAlan Stern1-5/+0
Remove special-purpose octeon drivers and instead use ehci-platform and ohci-platform as suggested with http://marc.info/?l=linux-mips&m=140139694721623&w=2 [andreas.herrmann: fixed compile error] Cc: David Daney <david.daney@cavium.com> Cc: Alex Smith <alex.smith@imgtec.com> Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Andreas Herrmann <andreas.herrmann@caviumnetworks.com> Acked-by: Ralf Baechle <ralf@linux-mips.org> Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-11-03usb: ehci: add ehci_port_power interfaceMichael Grzeschik1-1/+8
The current EHCI implementation is prepared to toggle the PORT_POWER bit to enable or disable a USB-Port. In some cases this port power can not be just toggled by the PORT_POWER bit, and the gpio-regulator is needed to be toggled too. This patch defines a port power control interface ehci_port_power for ehci core use, it toggles PORT_POWER bit as well as calls platform defined .port_power if it is defined. Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de> Signed-off-by: Peter Chen <peter.chen@freescale.com> Acked-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-09-23usb: hub: rename khubd to hub_wq in documentation and commentsPetr Mladek1-1/+1
USB hub has started to use a workqueue instead of kthread. Let's update the documentation and comments here and there. This patch mostly just replaces "khubd" with "hub_wq". There are only few exceptions where the whole sentence was updated. These more complicated changes can be found in the following files: Documentation/usb/hotplug.txt drivers/net/usb/usbnet.c drivers/usb/core/hcd.c drivers/usb/host/ohci-hcd.c drivers/usb/host/xhci.c Signed-off-by: Petr Mladek <pmladek@suse.cz> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-09-19USB: EHCI: unlink QHs even after the controller has stoppedAlan Stern1-2/+0
Old code in ehci-hcd tries to expedite disabling endpoints after the controller has stopped, by destroying the endpoint's associated QH without first unlinking the QH. This was necessary back when the driver wasn't so careful about keeping track of the controller's state. But now we are careful about it, and the driver knows that when the controller isn't running, no unlinking delay is needed. Furthermore, skipping the unlink step will trigger a BUG() in qh_destroy() when the preceding QH is released, because the link pointer will be non-NULL. Removing the lines that skip the unlinking step and go directly to QH_STATE_IDLE fixes the problem. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Reported-by: Joe Lawrence <joe.lawrence@stratus.com> Tested-by: Joe Lawrence <joe.lawrence@stratus.com> CC: <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-02-26usb: ehci: fix deadlock when threadirqs option is usedStanislaw Gruszka1-3/+10
ehci_irq() and ehci_hrtimer_func() can deadlock on ehci->lock when threadirqs option is used. To prevent the deadlock use spin_lock_irqsave() in ehci_irq(). This change can be reverted when hrtimer callbacks become threaded. Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com> Cc: stable <stable@vger.kernel.org> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-12-03USB: kill #undef VERBOSE_DEBUGOliver Neukum1-1/+0
It is useless now. Straight removal. Signed-off-by: Oliver Neukum <oneukum@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-12-03usb: kill DEBUG compile optionOliver Neukum1-3/+3
In the drivers that no longer need it, it is removed. It is removed from the Makefile. Drivers not fully converted to dynamic debug have it shifted down into the individual drivers. Signed-off-by: Oliver Neukum <oneukum@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-12-03ehci: Remove debugging at every interruptOliver Neukum1-7/+0
This is overkill. Just removeit. Signed-off-by: Oliver Neukum <oneukum@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-10-19USB: EHCI: add check for wakeup/suspend raceAlan Stern1-0/+8
hcd-pci.c in usbcore contains a check for wakeup requests racing with controller suspend. This check is going to be moved out of usbcore and into the individual controller drivers, where it can apply to all platforms, not just PCI. This patch adds the check to ehci-hcd. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-10-14USB: EHCI: create per-TT bandwidth tablesAlan Stern1-0/+22
This patch continues the scheduling changes in ehci-hcd by adding a table to store the bandwidth allocation below each TT. This will speed up the scheduling code, as it will no longer need to read through the entire schedule to compute the bandwidth currently in use. Properly speaking, the FS/LS budget calculations should be done in terms of full-speed bytes per microframe, as described in the USB-2 spec. However the driver currently uses microseconds per microframe, and the scheduling code isn't robust enough at this point to change over. For the time being, we leave the calculations as they are. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-10-11USB: EHCI: use a bandwidth-allocation tableAlan Stern1-0/+3
This patch significantly changes the scheduling code in ehci-hcd. Instead of calculating the current bandwidth utilization by trudging through the schedule and adding up the times used by the existing transfers, we will now maintain a table holding the time used for each of 64 microframes. This will drastically speed up the bandwidth computations. In addition, it eliminates a theoretical bug. An isochronous endpoint may have bandwidth reserved even at times when it has no transfers listed in the schedule. The table will keep track of the reserved bandwidth, whereas adding up entries in the schedule would miss it. As a corollary, we can keep bandwidth reserved for endpoints even when they aren't in active use. Eventually the bandwidth will be reserved when a new alternate setting is installed; for now the endpoint's reservation takes place when its first URB is submitted. A drawback of this approach is that transfers with an interval larger than 64 microframes will have to be charged for bandwidth as though the interval was 64. In practice this shouldn't matter much; transfers with longer intervals tend to be rather short anyway (things like hubs or HID devices). Another minor drawback is that we will keep track of two different period and phase values: the actual ones and the ones used for bandwidth allocation (which are limited to 64). This adds only a small amount of overhead: 3 bytes for each endpoint. The patch also adds a new debugfs file named "bandwidth" to display the information stored in the new table. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-10-11USB: EHCI: create a "periodic schedule info" structAlan Stern1-1/+1
This patch begins the process of unifying the scheduling parameters that ehci-hcd uses for interrupt and isochronous transfers. It creates an ehci_per_sched structure, which will be stored in both ehci_qh and ehci_iso_stream structures, and will contain the common scheduling information needed for both. Initially we merely create the new structure and move some existing fields into it. Later patches will add more fields and utilize these structures in improved scheduling algorithms. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-10-11USB: EHCI: change toggle only upon successful resetAlan Stern1-1/+1
ehci-hcd uses a value of 0 in an endpoint's toggle flag to indicate that the endpoint has been reset (and therefore the Data Toggle bit needs to be cleared in the endpoint's QH overlay region). The toggle flag should be set to 0 only when ehci_endpoint_reset() succeeds. This patch moves the usb_settoggle() call into the appropriate branch of the "if" statement. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-09-26USB: EHCI: make ehci-w90X900 a separate driverManjunath Goudar1-5/+0
Separate the W90X900(W90P910) on-chip host controller driver from ehci-hcd host code so that it can be built as a separate driver module. This work is part of enabling multi-platform kernels on ARM; however, note that other changes are still needed before W90X900(W90P910) can be booted with a multi-platform kernel and an ehci driver that only works on one of them. With the infrastructure added by Alan Stern in patch 3e0232039 "USB: EHCI: prepare to make ehci-hcd a library module", we can avoid this problem by turning a bus glue into a separate module, as we do here for the w90X900 bus glue. This patch is rebased on greghk/usb-next 3.12 rc1. Signed-off-by: Manjunath Goudar <manjunath.goudar@linaro.org> Signed-off-by: Deepak Saxena <dsaxena@linaro.org> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Wan ZongShun <mcuos.com@gmail.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-09-23Revert "Revert "USB: EHCI: support running URB giveback in tasklet context""Greg Kroah-Hartman1-1/+1
This reverts commit 3b8d7321ed4b8511e17048303b806ffcc2806077, which brings back commit 428aac8a81058e2303677a8fbf26670229e51d3a as it should be working for the 3.13-rc1 merge window now that Alan's other fixes are here in the tree already. Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Ming Lei <ming.lei@canonical.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-09-17Revert "USB: EHCI: support running URB giveback in tasklet context"Greg Kroah-Hartman1-1/+1
This reverts commit 428aac8a81058e2303677a8fbf26670229e51d3a. This isn't quite ready for 3.12, we need some more EHCI driver changes that are just now showing up. So revert this for now, and queue it up later for 3.13. Reported-by: Alan Stern <stern@rowland.harvard.edu> Cc: Ming Lei <ming.lei@canonical.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-08-30ehci: remove debugging statement with ehci statistics in ehci_stop()Xenia Ragiadakou1-8/+0
This patch removes the ehci statictics information output in ehci_stop() because they do not provide interesting info. At any case, the current statistics can be viewed by reading the 'registers' file in debugfs. Signed-off-by: Xenia Ragiadakou <burzalodowa@gmail.com> Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-08-30ehci: enable debugging code when CONFIG_DYNAMIC_DEBUG is setXenia Ragiadakou1-3/+3
The debugging code for ehci is enabled to run if the DEBUG flag is defined. This patch enables the debugging code also when the kernel is configured with dynamic debugging on. Signed-off-by: Xenia Ragiadakou <burzalodowa@gmail.com> Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-08-12USB: EHCI: support running URB giveback in tasklet contextMing Lei1-1/+1
All 4 transfer types can work well on EHCI HCD after switching to run URB giveback in tasklet context, so mark all HCD drivers to support it. Also we don't need to release ehci->lock during URB giveback any more. >From below test results on 3 machines(2 ARM and one x86), time consumed by EHCI interrupt handler droped much without performance loss. 1 test description 1.1 mass storage performance test: - run below command 10 times and compute the average performance dd if=/dev/sdN iflag=direct of=/dev/null bs=200M count=1 - two usb mass storage device: A: sandisk extreme USB 3.0 16G(used in test case 1 & case 2) B: kingston DataTraveler G2 4GB(only used in test case 2) 1.2 uvc function test: - run one simple capture program in the below link http://kernel.ubuntu.com/~ming/up/capture.c - capture format 640*480 and results in High Bandwidth mode on the uvc device: Z-Star 0x0ac8/0x3450 - on T410(x86) laptop, also use guvcview to watch video capture/playback 1.3 about test2 and test4 - both two devices involved are tested concurrently by above test items 1.4 how to compute irq time(the time consumed by ehci_irq) - use trace points of irq:irq_handler_entry and irq:irq_handler_exit 1.5 kernel 3.10.0-rc3-next-20130528 1.6 test machines Pandaboard A1: ARM CortexA9 dural core Arndale board: ARM CortexA15 dural core T410: i5 CPU 2.67GHz quad core 2 test result 2.1 test case1: single mass storage device performance test -------------------------------------------------------------------- upstream | patched perf(MB/s)+irq time(us) | perf(MB/s)+irq time(us) -------------------------------------------------------------------- Pandaboard A1: 25.280(avg:145,max:772) | 25.540(avg:14, max:75) Arndale board: 29.700(avg:33, max:129) | 29.700(avg:10, max:50) T410: 34.430(avg:17, max:154*)| 34.660(avg:12, max:155) --------------------------------------------------------------------- 2.2 test case2: two mass storage devices' performance test -------------------------------------------------------------------- upstream | patched perf(MB/s)+irq time(us) | perf(MB/s)+irq time(us) -------------------------------------------------------------------- Pandaboard A1: 15.840/15.580(avg:158,max:1216) | 16.500/16.160(avg:15,max:139) Arndale board: 17.370/16.220(avg:33 max:234) | 17.480/16.200(avg:11, max:91) T410: 21.180/19.820(avg:18 max:160) | 21.220/19.880(avg:11, max:149) --------------------------------------------------------------------- 2.3 test case3: one uvc streaming test - uvc device works well(on x86, luvcview can be used too and has same result with uvc capture) -------------------------------------------------------------------- upstream | patched irq time(us) | irq time(us) -------------------------------------------------------------------- Pandaboard A1: (avg:445, max:873) | (avg:33, max:44) Arndale board: (avg:316, max:630) | (avg:20, max:27) T410: (avg:39, max:107) | (avg:10, max:65) --------------------------------------------------------------------- 2.4 test case4: one uvc streaming plus one mass storage device test -------------------------------------------------------------------- upstream | patched perf(MB/s)+irq time(us) | perf(MB/s)+irq time(us) -------------------------------------------------------------------- Pandaboard A1: 20.340(avg:259,max:1704)| 20.390(avg:24, max:101) Arndale board: 23.460(avg:124,max:726) | 23.370(avg:15, max:52) T410: 28.520(avg:27, max:169) | 28.630(avg:13, max:160) --------------------------------------------------------------------- 2.5 test case5: read single mass storage device with small transfer - run below command 10 times and compute the average speed dd if=/dev/sdN iflag=direct of=/dev/null bs=4K count=4000 1), test device A: -------------------------------------------------------------------- upstream | patched perf(MB/s)+irq time(us) | perf(MB/s)+irq time(us) -------------------------------------------------------------------- Pandaboard A1: 6.5(avg:21, max:64) | 6.5(avg:10, max:24) Arndale board: 8.13(avg:12, max:23) | 8.06(avg:7, max:17) T410: 6.66(avg:13, max:131) | 6.84(avg:11, max:149) --------------------------------------------------------------------- 2), test device B: -------------------------------------------------------------------- upstream | patched perf(MB/s)+irq time(us) | perf(MB/s)+irq time(us) -------------------------------------------------------------------- Pandaboard A1: 5.5(avg:21,max:43) | 5.49(avg:10, max:24) Arndale board: 5.9(avg:12, max:22) | 5.9(avg:7, max:17) T410: 5.48(avg:13, max:155) | 5.48(avg:7, max:140) --------------------------------------------------------------------- * On T410, sometimes read ehci status register in ehci_irq takes more than 100us, and the problem has been reported on the link: http://marc.info/?t=137065867300001&r=1&w=2 Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Ming Lei <ming.lei@canonical.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-08-12USB: EHCI: improve interrupt qh unlinkMing Lei1-0/+1
ehci-hcd currently unlinks an interrupt QH when it becomes empty, that is, after its last URB completes. This works well because in almost all cases, the completion handler for an interrupt URB resubmits the URB; therefore the QH doesn't become empty and doesn't get unlinked. When we start using tasklets for URB completion, this scheme won't work as well. The resubmission won't occur until the tasklet runs, which will be some time after the completion is queued with the tasklet. During that delay, the QH will be empty and so will be unlinked unnecessarily. To prevent this problem, this patch adds a 5-ms time delay before empty interrupt QHs are unlinked. Most often, during that time the interrupt URB will be resubmitted and thus we can avoid unlinking the QH. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Ming Lei <ming.lei@canonical.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-08-12USB: EHCI: improve ehci_endpoint_disableMing Lei1-10/+6
The patch does the below improvement: - think QH_STATE_COMPLETING as unlinking state since all URBs on the endpoint should be in unlinking or unlinked when doing endpoint_disable() - add "WARN_ON(!list_empty(&qh->qtd_list));" if qh->qh_state is QH_STATE_LINKED because there shouldn't be any active transfer in qh - when qh->qh_state is QH_STATE_LINKED, the QH(async or periodic) should be in its corresponding list, so the search through the async list isn't necessary. - unlink periodic QH to speed up unlinking if the QH is in linked state Basically, only the last one is related with this patchset because the assumption of "periodic qh self-unlinks on empty" isn't true any more when we introduce unlink-wait for periodic qh. Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Ming Lei <ming.lei@canonical.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-06-17USB: EHCI: make ehci-tegra a separate driverManjunath Goudar1-5/+0
Separate the Tegra on-chip host controller driver from ehci-hcd host code so that it can be built as a separate driver module. This work is part of enabling multi-platform kernels on ARM. Signed-off-by: Manjunath Goudar <manjunath.goudar@linaro.org> [swarren, reworked Manjunath's patches to split them more logically, minor re-order of added lines to better match layout of other split-up HCD drivers and existing code, add MODULE_DEVICE_TABLE, fix MODULE_LICENSE, adapted to change in earlier patches which removed the ehci_driver_overrides addition, removed all PM code and solved circular dependencies.] Signed-off-by: Stephen Warren <swarren@nvidia.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Alan Stern <stern@rowland.harvard.edu> Tested-by: Thierry Reding <thierry.reding@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-06-17USB: EHCI: export ehci_handshake for ehci-hcd sub-driversManjunath Goudar1-7/+10
In order to split ehci-hcd.c into separate modules, handshake() must be exported. Rename the symbol to add an ehci_ prefix, to avoid any naming clashes. Signed-off-by: Manjunath Goudar <manjunath.goudar@linaro.org> [swarren, split Manjunath's patches more logically, limit this change to export just handshake()] Signed-off-by: Stephen Warren <swarren@nvidia.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Acked-by: Arnd Bergmann <arnd@arndb.de> Tested-by: Thierry Reding <thierry.reding@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-05-16USB: EHCI: remove bogus #errorArnd Bergmann1-17/+0
The EHCI host controller driver can be built standalone now, without enabling any of the available bus glue drivers, so there is not really a reason to error out here: drivers/usb/host/ehci-hcd.c:1303:2: error: #error "missing bus glue for ehci-hcd" #error "missing bus glue for ehci-hcd" The alternative would be to change the Kconfig code to build the ehci-hcd module only if any of the symbols below are in fact enabled. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-04-17usb: remove redundant tdi_resetShengzhou Liu1-3/+0
We remove the redundant tdi_reset in ehci_setup since there is already it in ehci_reset. It was observed that the duplicated tdi_reset was causing the PHY_CLK_VALID bit unstable. Reported-by: Michael Braun <michael-dev@fami-braun.de> Signed-off-by: Shengzhou Liu <Shengzhou.Liu@freescale.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Cc: stable <stable@vger.kernel.org> # 3.6+ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-04-08USB: EHCI: make ehci-msm a separate driverManjunath Goudar1-5/+1
Separate the Qualcomm QSD/MSM on-chip host controller driver from ehci-hcd host code so that it can be built as a separate driver module. This work is part of enabling multi-platform kernels on ARM; however, note that other changes are still needed before Qualcomm QSD/MSM can be booted with a multi-platform kernel, which is not expected before 3.11. With the infrastructure added by Alan Stern in patch 3e0232039 "USB: EHCI: prepare to make ehci-hcd a library module", we can avoid this problem by turning a bus glue into a separate module, as we do here for the msm bus glue. In V5 (arnd): - add FIXME about missing usb_add_hcd() or usb_remove_hcd() calls In V3: - Detailed commit message added here describing why this patch is required. - Arranged #include's in alphabetical order. - driver.name initialized hcd_name[] = "ehci-msm" in platform_driver structure initialization instead of "msm-ehci", which was the reason why it broke in EHCI USB testing In V2: Tegra patch related changes removed from this patch. Signed-off-by: Manjunath Goudar <manjunath.goudar@linaro.org> Acked-by: Alan Stern <stern@rowland.harvard.edu> Acked-by: David Brown <davidb@codeaurora.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-04-08USB: EHCI: make ehci-atmel a separate driverManjunath Goudar1-5/+1
Separate the Atmel host controller driver from ehci-hcd host code so that it can be built as a separate driver module. This work is part of enabling multi-platform kernels on ARM; however, note that other changes are still needed before Atmel can be booted with a multi-platform kernel. This is currently planned for Linux-3.11. With the infrastructure added by Alan Stern in patch 3e0232039 "USB: EHCI: prepare to make ehci-hcd a library module", we can avoid this problem by turning a bus glue into a separate module, as we do here for the Atmel bus glue. In V4 (arnd): - reordered #include statements. - removed call to ehci_shutdown and the corresponding export In V3: - Detailed commit message added here about why this patch is required. - Replaced hcd_name string "ehci-atmel" to "atmel-ehci". - Inserted blank line in the Makefile to separate the EHCI drivers from the following non-EHCI drivers. - Exported ehci_shutdown symbol as it is needed by the Atmel driver. - Eliminated ehci_atmel_setup routine because hcd registers can be directly set in the ehci_atmel_drv_probe function. In V2: Resolved below compiler error. drivers/usb/host/ehci-atmel.c: In function 'ehci_atmel_drv_remove': drivers/usb/host/ehci-atmel.c:167: error: implicit declaration of function 'ehci_shutdown' Signed-off-by: Manjunath Goudar <manjunath.goudar@linaro.org> Acked-by: Alan Stern <stern@rowland.harvard.edu> Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com> Cc: Andrew Victor <linux@maxim.org.za> Cc: Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-04-08USB: EHCI: make ehci-s5p a separate driverManjunath Goudar1-5/+1
Separate the Samsung S5P/EXYNOS host controller driver from ehci-hcd host code so that it can be built as a separate driver module. This work is part of enabling multi-platform kernels on ARM; however, note that other changes are still needed before S5P/EXYNOS can be booted with a multi-platform kernel. We currently expect those to get merged for 3.10. With the infrastructure added by Alan Stern in patch 3e0232039 "USB: EHCI: prepare to make ehci-hcd a library module", we can avoid this problem by turning a bus glue into a separate module, as we do here for the s5p bus glue. In V4 (arnd) - revert some of the pointless changes. - fix allocation of s5p specific data structure. In V3: - Detailed commit message added here, why this patch is required. - MODULE_LICENSE is GPL v2. - Added .extra_priv_size to eliminate the separate allocation of the s5p_ehci_hcd structure and removed .reset function pointer initialization. - Arranged #include's in alphabetical order. - After using extra_priv_size initialization, struct usb_hcd *hcd is redundant and can be removed from the probe function. - Eliminated s5p_ehci_phy_enable,contents of statements moved into the s5p_ehci_probe - Eliminated s5p_ehci_phy_disable, contents of statements moved into the s5p_ehci_remove. In V2: - Tegra patch related changes removed from this patch. Signed-off-by: Manjunath Goudar <manjunath.goudar@linaro.org> Acked-by: Jingoo Han <jg1.han@samsung.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Cc: Kukjin Kim <kgene.kim@samsung.com> Cc: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-04-08USB: EHCI: make ehci-spear a separate driverManjunath Goudar1-5/+1
Separate the SPEAr host controller driver from ehci-hcd host code so that it can be built as a separate driver module. This work is part of enabling multi-platform kernels on ARM; however, note that other changes are still needed before SPEAr can be booted with a multi-platform kernel, but they are queued in the arm-soc tree for 3.10. With the infrastructure added by Alan Stern in patch 3e0232039 "USB: EHCI: prepare to make ehci-hcd a library module", we can avoid this problem by turning a bus glue into a separate module, as we do here for the SPEAr bus glue. In V4 (arnd): - renamed all 'struct spear_ehci' pointers from 'ehci' to the less ambiguous 'sehci'. - folded trivial spear_start_ehci/spear_stop_ehci functions into callers. - brought back initialization of ehci->caps. In V3: - Detailed commit message added here about why this patch is required. - Eliminated ehci_spear_setup routine because hcd registers can be directly set in the spear_ehci_hcd_drv_probe function. - spear_overrides struct initialized. - Converted to using .extra_priv_size for allocating spear_ehci, and updated all users of that structure. - to_spear_ehci() macro modified for spear_ehci. In V2: - Replaced spear as SPEAr everywhere, leaving functions/variables/config options. Signed-off-by: Deepak Saxena <dsaxena@linaro.org> Signed-off-by: Manjunath Goudar <manjunath.goudar@linaro.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Viresh Kumar <viresh.linux@gmail.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Cc: Shiraz Hashim <shiraz.hashim@st.com> Cc: spear-devel@list.st.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-04-08USB: EHCI: make ehci-orion a separate driverManjunath Goudar1-5/+1
Separate the Orion host controller driver from ehci-hcd host code into its own driver module because of following reason. With the multiplatform changes in arm-soc tree, it becomes possible to enable the mvebu platform (which uses ehci-orion) at the same time as other platforms that require a conflicting EHCI bus glue. At the moment, this results in a warning like drivers/usb/host/ehci-hcd.c:1297:0: warning: "PLATFORM_DRIVER" redefined [enabled by default] drivers/usb/host/ehci-hcd.c:1277:0: note: this is the location of the previous definition drivers/usb/host/ehci-orion.c:334:31: warning: 'ehci_orion_driver' defined but not used [-Wunused-variable] and an ehci driver that only works on one of them. With the infrastructure added by Alan Stern in patch 3e0232039 "USB: EHCI: prepare to make ehci-hcd a library module", we can avoid this problem by turning a bus glue into a separate module, as we do here for the orion bus glue. An earlier version of this patch was included in 3.9 but caused a regression there, which has subsequently been fixed. While we are here, use the opportunity to disabiguate the two Marvell EHCI controller implementations in Kconfig. In V4 (arnd): - Improve Kconfig text In V3: - More detail provided in commit message regarding this patch. - Replaced hcd_name string "ehci-orion" into "orion-ehci". - MODULE_LICENSE is GPL v2. - In ehci_init_driver calling second argument passed as NULL instead of ehci_orion_overrides because ehci_orion_overrides is removed. In V2: - Tegra patch related changes removed from this patch. Signed-off-by: Manjunath Goudar <manjunath.goudar@linaro.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Jason Cooper <jason@lakedaemon.net> Tested-by: Andrew Lunn <andrew@lunn.ch> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-03-28USB: EHCI: DT support for generic bus glueArnd Bergmann1-5/+0
This lets us use the ehci-platform driver on platforms without special requirements for their ehci controllers. In particular, this is true for the vt8500/wm8x50 platforms, which currently have a separate driver that causes problems with multiplatform configurations. Tested-by: Tony Prisk <linux@prisktech.co.nz> Tested-by: Peter Vasil <petervasil@gmail.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-03-25USB: EHCI: improve end_unlink_async()Alan Stern1-2/+2
This patch (as1665) changes the way ehci-hcd's end_unlink_async() routine works in order to avoid recursive execution and to be more efficient: Now when an IAA cycle ends, a new one gets started up right away (if it is needed) instead of waiting until the just-unlinked QH has been processed. The async_iaa list is renamed to async_idle, which better expresses its new purpose: It is now the list of QHs which are now completely idle and are waiting to be processed by end_unlink_async(). A new flag is added to track whether an IAA cycle is in progress, because the list formerly known as async_iaa no longer stores the QHs waiting for the IAA to finish. The decision about how many QHs to process when an IAA cycle ends is now made at the end of the cycle, when we know the current state of the hardware, rather than at the beginning. This means a bunch of logic got moved from start_iaa_cycle() to end_unlink_async(). Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-03-25USB: EHCI: convert singly-linked lists to list_headsAlan Stern1-1/+4
This patch (as1664) converts ehci-hcd's async_unlink, async_iaa, and intr_unlink from singly-linked lists to standard doubly-linked list_heads. Originally it didn't seem necessary to use list_heads, because items are always added to and removed from these lists in FIFO order. But now with more list processing going on, it's easier to use the standard routines than continue with a roll-your-own approach. I don't know if the code ends up being notably shorter, but the patterns will be more familiar to any kernel hacker. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-03-25USB: EHCI: consolidate code in ehci_urb_dequeue()Alan Stern1-37/+11
This patch (as1668) consolidates two nearly identical code paths in ehci_urb_dequeue(). The test for !qh can be removed because it will never succeed; the fact that usb_hcd_check_unlink_urb() returned 0 means that urb must be queued and therefore urb->hcpriv must point to a QH. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-03-25USB: EHCI: split needs_rescan into two flagsAlan Stern1-5/+11
This patch (as1662) does some more QH-related cleanup in ehci-hcd. The qh->needs_rescan flag is currently used for two different purposes; the patch replaces it with two separate flags for greater clarity: qh->dequeue_during_giveback indicates that a completion handler dequeued an URB (implying that a rescan is needed), and qh->exception indicates that the QH is in an exceptional state requiring an unlink (either it encountered an I/O error or an unlink was requested). The new flags get set where the dequeue, exception, or unlink request occurred, rather than where the unlink is started. This is so that in the future, if we need to, we will be able to tell apart unlinks that truly were required from those that were carried out merely because the QH wasn't being used. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-03-20Merge branch 'usb-linus' into usb-nextGreg Kroah-Hartman1-4/+3
This is to pick up the fixes in that branch, and let Alan fix the merge error in drivers/usb/host/ehci-timer.c better than I just did (as I know I messed it up...) Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-03-18USB: EHCI: improve use of per-port status-change bitsAlan Stern1-2/+2
This patch (as1634) simplifies some of the code associated with the per-port change bits added in EHCI-1.1, and in particular it fixes a bug in the logic of ehci_hub_status_data(). Even if the change bit doesn't indicate anything happened on a particular port, we still have to notify the core about changes to the suspend or reset status. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-03-15USB: EHCI: fix regression during bus resumeAlan Stern1-0/+1
This patch (as1663) fixes a regression caused by commit 6e0c3339a6f19d748f16091d0a05adeb1e1f822b (USB: EHCI: unlink one async QH at a time). In order to avoid keeping multiple QHs in an unusable intermediate state, that commit changed unlink_empty_async() so that it unlinks only one empty QH at a time. However, when the EHCI root hub is suspended, _all_ async QHs need to be unlinked. ehci_bus_suspend() used to do this by calling unlink_empty_async(), but now this only unlinks one of the QHs, not all of them. The symptom is that when the root hub is resumed, USB communications don't work for some period of time. This is because ehci-hcd doesn't realize it needs to restart the async schedule; it assumes that because some QHs are already on the schedule, the schedule must be running. The easiest way to fix the problem is add a new function that unlinks all the async QHs when the root hub is suspended. This patch should be applied to all kernels that have the 6e0c3339a6f1 commit. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Reported-and-tested-by: Adrian Bassett <adrian.bassett@hotmail.co.uk> Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-03-15USB: EHCI: split ehci-omap out to a separate driverAlan Stern1-5/+1
This patch (as1645) converts ehci-omap over to the new "ehci-hcd is a library" approach, so that it can coexist peacefully with other EHCI platform drivers and can make use of the private area allocated at the end of struct ehci_hcd. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-03-05USB: EHCI: work around silicon bug in Intel's EHCI controllersAlan Stern1-4/+2
This patch (as1660) works around a hardware problem present in some (if not all) Intel EHCI controllers. After a QH has been unlinked from the async schedule and the corresponding IAA interrupt has occurred, the controller is not supposed access the QH and its qTDs. There certainly shouldn't be any more DMA writes to those structures. Nevertheless, Intel's controllers have been observed to perform a final writeback to the QH's overlay region and to the most recent qTD. For more information and a test program to determine whether this problem is present in a particular controller, see http://marc.info/?l=linux-usb&m=135492071812265&w=2 http://marc.info/?l=linux-usb&m=136182570800963&w=2 This patch works around the problem by always waiting for two IAA cycles when unlinking an async QH. The extra IAA delay gives the controller time to perform its final writeback. Surprisingly enough, the effects of this silicon bug have gone undetected until quite recently. More through luck than anything else, it hasn't caused any apparent problems. However, it does interact badly with the path that follows this one, so it needs to be addressed. This is the first part of a fix for the regression reported at: https://bugs.launchpad.net/bugs/1088733 Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Tested-by: Stephen Thirlwall <sdt@dr.com> CC: <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-25USB: EHCI: notify usbcore about port resumesAlan Stern1-0/+1
This patch (as1650) adds calls to the new usb_hcd_{start,end}_port_resume() functions to ehci-hcd. Now EHCI root hubs won't be runtime suspended while they are sending a resume signal to one of their ports. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Tested-by: Ming Lei <ming.lei@canonical.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-23USB: EHCI: fix build error in ehci-mxcAlan Stern1-5/+1
This patch (as1643b) fixes a build error in ehci-hcd when compiling for ARM with allmodconfig: drivers/usb/host/ehci-hcd.c:1285:0: warning: "PLATFORM_DRIVER" redefined [enabled by default] drivers/usb/host/ehci-hcd.c:1255:0: note: this is the location of the previous definition drivers/usb/host/ehci-mxc.c:280:31: warning: 'ehci_mxc_driver' defined but not used [-Wunused-variable] drivers/usb/host/ehci-hcd.c:1285:0: warning: "PLATFORM_DRIVER" redefined [enabled by default] drivers/usb/host/ehci-hcd.c:1255:0: note: this is the location of the previous definition The fix is to convert ehci-mxc over to the new "ehci-hcd is a library" scheme so that it can coexist peacefully with the ehci-platform driver. As part of the conversion the ehci_mxc_priv data structure, which was allocated dynamically, is now placed where it belongs: in the private area at the end of struct ehci_hcd. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Tested-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-22USB: EHCI: fix incorrect configuration testAlan Stern1-1/+1
This patch (as1641) fixes a minor bug in ehci-hcd left over from when the Chipidea driver was converted to the "ehci-hcd is a library" scheme. The test for whether the Chipidea platform driver is active should be IS_ENABLED(), not defined(). Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-22USB: EHCI: Move definition of EHCI_STATS to ehci.hRoger Quadros1-4/+0
Without this, platform drivers e.g. ehci-omap.c will see a different version of struct ehci_hcd than ehci-hcd.c and break reference to 'debug_dir' and 'priv' members when CONFIG_USB_DEBUG is enabled. Signed-off-by: Roger Quadros <rogerq@ti.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-11-11USB: EHCI: miscellaneous cleanups for the library conversionAlan Stern1-4/+5
This patch (as1630) cleans up a few minor items resulting from the split-up of the ehci-hcd driver: Remove the product_desc string from the ehci_driver_overrides structure. All drivers will use the generic "EHCI Host Controller" string. (This was requested by Felipe Balbi.) Allow drivers to pass a NULL pointer to ehci_init_driver() if they don't have to override any settings. Remove a #define symbol that is no longer used from the ChipIdea host driver. Rename overrides to pci_overrides in ehci-pci.c, for consistency with ehci-platform.c. Mark the *_overrides structures as __initdata. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Reviewed-by: Felipe Balbi <balbi@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-11-02USB: EHCI: fix build error by making ChipIdea host a normal EHCI driverAlan Stern1-10/+1
This patch (as1627) splits the ehci-hcd core code, which has become a separate library module, out from the ChipIdea host driver. Instead of #include-ing ehci-hcd.c directly, the ChipIdea module will now use the ehci-hcd library in a normal fashion. This fixes a build error caused by commit 3e0232039967d7a1a06c013d097458b4d5892af1 (USB: EHCI: prepare to make ehci-hcd a library module); I had forgotten about the unorthodox way the ChipIdea driver uses the ehci-hcd code. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Acked-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-11-01USB: EHCI: make ehci-platform a separate driverAlan Stern1-5/+1
This patch (as1626) splits the ehci-platform code from ehci-hcd out into its own separate driver module. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-11-01USB: EHCI: make ehci-pci a separate driverAlan Stern1-21/+5
This patch (as1625) splits the PCI portion of ehci-hcd out into its own separate driver module, called ehci-pci. Consistently with the current practice, the decision whether to build this module is not user-configurable. If EHCI and PCI are enabled then the module will be built, always. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> CC: Felipe Balbi <balbi@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-11-01USB: EHCI: prepare to make ehci-hcd a library moduleAlan Stern1-3/+70
This patch (as1624) prepares ehci-hcd for being split up into a core library and separate platform driver modules. A generic ehci_hc_driver structure is created, containing all the "standard" values, and a new mechanism is added whereby a driver module can specify a set of overrides to those values. In addition the ehci_setup(), ehci_suspend(), and ehci_resume() routines need to be EXPORTed for use by the drivers. As a side effect of this change, a few routines no longer need to be marked __maybe_unused. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> CC: Felipe Balbi <balbi@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-10-31USB: EHCI: remove ehci_port_power() routineAlan Stern1-21/+0
This patch (as1623) removes the ehci_port_power() routine and all the places that call it. There's no reason for ehci-hcd to change the port power settings; the hub driver takes care of all that stuff. There is one exception: When the controller is resumed from hibernation or following a loss of power, the ports that are supposed to be handed over to a companion controller must be powered on first. Otherwise the handover won't work. This process is not visible to the hub driver, so it has to be handled in ehci-hcd. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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