- 17 Jul, 2012 12 commits
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Bjørn Mork authored
Creating a common exit path from qcprobe to make it easier to extend it. Signed-off-by:
Bjørn Mork <bjorn@mork.no> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Bjørn Mork authored
No need to replicate the same code all over the place. Signed-off-by:
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Vivek Gautam authored
This patch adds support to parse probe data for ehci driver for exynos using device tree Signed-off-by:
Thomas Abraham <thomas.abraham@linaro.org> Signed-off-by:
Abhilash Kesavan <a.kesavan@samsung.com> Signed-off-by:
Vivek Gautam <gautam.vivek@samsung.com> Acked-by:
Jingoo Han <jg1.han@samsung.com> Acked-by:
Alan Stern <stern@rowland.harvard.edu> Signed-off-by:
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Vivek Gautam authored
This patch adds support to parse probe data for ohci driver for exynos using device tree. Signed-off-by:
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Ming Lei authored
The omap_ehci_init() is introduced in the below commit: commit 1a49e2ac(EHCI: centralize controller initialization) the local variable of 'pdev' inside omap_ehci_init() is used but not defined, so fix the compiling failure. Signed-off-by:
Ming Lei <ming.lei@canonical.com> Acked-by:
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Laxman Dewangan authored
The ehci_setup() require the pointer of usb_hcd. Passing the correct pointer in place of ehci_hcd pointer. This is side effect of change: commit 1a49e2ac Author: Alan Stern <stern@rowland.harvard.edu> EHCI: centralize controller initialization [Although I checked for this specifically, obviously I missed some of the calls. In addition to the mistake in ehci-tegra.c that Laxman fixed here, the same thing needs to be fixed in ehci-orion.c and ehci-xls.c. -- Alan Stern] Signed-off-by:
Laxman Dewangan <ldewangan@nvidia.com> Signed-off-by:
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Kumar Gala authored
We need to use CONFIG_FSL_SOC_BOOKE instead of CONFIG_PPC_85xx as CONFIG_PPC_85xx isn't defined when we build support for 64-bit embedded FSL PPC SoCs. Signed-off-by:
Kumar Gala <galak@kernel.crashing.org> Signed-off-by:
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Ben Minerds authored
Changes to conform with checkpatch.sh script. - return is not a function, parentheses not required. Removed 1 checkpatch.sh error. Signed-off-by:
Ben Minerds <puzzleduck@gmail.com> Signed-off-by:
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Ben Minerds authored
Changes to conform with checkpatch.sh script. - trailing whitespace. Removed 1 checkpatch.sh error. Signed-off-by:
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Ben Minerds authored
Changes to conform with checkpatch.sh script. - space near open parenthesis '('. Removed 2 checkpatch.sh errors. Signed-off-by: -
Ben Minerds authored
Changes to conform with checkpatch.sh script. - space around '='. Removed 1 checkpatch.sh error. Signed-off-by:
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Ben Minerds authored
Changes to conform with checkpatch.sh script. - spaces around '?' and ':'. Removed 14 checkpatch.sh errors. Signed-off-by:
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- 16 Jul, 2012 28 commits
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Greg Kroah-Hartman authored
Merge tag 'for-usb-next-2012-07-11' of git://git.kernel.org/pub/scm/linux/kernel/git/sarah/xhci into usb-next USB: Link PM fixes and Latency Tolerance Messaging Hi Greg, Here's four bug fix patches for Link PM (LPM), which are marked for 3.5-stable. There's also three patches that turn on Latency Tolerance Messaging (LTM) for xHCI host controllers and USB 3.0 devices that support this low power feature. Please queue for 3.6. Sarah Sharp
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Alan Stern authored
This patch (as1589) resolves some unlikely races involving system shutdown or controller death in ehci-hcd: Shutdown races with both root-hub resume and controller resume. Controller death races with root-hub suspend. A new bitflag is added to indicate that the controller has been shut down (whether for system shutdown or because it died). Tests are added in the suspend and resume pathways to avoid reactivating the controller after any sort of shutdown. Signed-off-by:
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Alan Stern authored
This patch (as1588) adjusts the locking in ehci-hcd's various halt, shutdown, and suspend/resume pathways. We want to hold the spinlock while writing device registers and accessing shared variables, but not while polling in a loop. In addition, there's no need to call ehci_work() at times when no URBs can be active, i.e., in ehci_stop() and ehci_bus_suspend(). Finally, ehci_adjust_port_wakeup_flags() is called only in situations where interrupts are enabled; therefore it can use spin_lock_irq rather than spin_lock_irqsave. Signed-off-by:
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Alan Stern authored
This patch (as1587) simplifies ehci-hcd's scan_isoc() routine by eliminating some local variables, declaring boolean-valued values as bool rather than unsigned, changing variable names to make more sense, and so on. The logic at the end of the routine is cut down significantly. The scanning doesn't have to catch up all the way to where the hardware is; it merely has to catch up to where the hardware was when the last interrupt occurred. If the hardware has made more progress since then and issued another interrupt, a rescan will catch up to it. Signed-off-by:
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Alan Stern authored
This patch (as1586) replaces the kernel timer used by ehci-hcd as an I/O watchdog with an hrtimer event. Unlike in the current code, the watchdog event is now always enabled whenever any isochronous URBs are active. This will prevent bugs caused by the periodic schedule wrapping around with no completion interrupts; the watchdog handler is guaranteed to scan the isochronous transfers at least once during each iteration of the schedule. The extra overhead will be negligible: one timer interrupt every 100 ms. Signed-off-by:
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Alan Stern authored
This patch (as1585) fixes a bug in ehci-hcd's scheme for scanning interrupt QHs. Currently a single routine takes care of scanning everything on the periodic schedule. Whenever an interrupt occurs, it scans all isochronous and interrupt URBs scheduled for frames that have elapsed since the last scan. This has two disadvantages. The first is relatively minor: An interrupt QH is likely to end up getting scanned multiple times, particularly if the last scan was not fairly recent. (The current code avoids this by maintaining a periodic_stamp in each interrupt QH.) The second is more serious. The periodic schedule wraps around. If the last scan occurred during frame N, and the next scan occurs when the schedule has gone through an entire cycle and is back at frame N, the scanning code won't look at any frames other than N. Consequently it won't see any QHs that completed during frame N-1 or earlier. The patch replaces the entire frame-based approach for scanning interrupt QHs with a new routine using a list-based approach, the same as for async QHs. This has a slight disadvantage, because it means that all interrupt QHs have to be scanned every time. But it is more robust than the current approach. Signed-off-by:
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Alan Stern authored
This patch (as1584) fixes a minor bug that has been present in ehci-hcd since the beginning. Scanning the schedules for URB completions is single-threaded. If a completion interrupt occurs while an URB is being given back, the interrupt handler realizes that a scan is in progress on another CPU and avoids starting a new one. This means that completion events can be lost. If an URB completes after it has been scanned but while a scan is still in progress, the driver won't notice and won't rescan the completed URB. The patch fixes the problem by adding a new flag to indicate that another scan is needed after the current scan is done. The flag gets set whenever a completion interrupt occurs while a scan is in progress. The rescan will see the completion, thus preventing it from getting lost. Signed-off-by:
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Alan Stern authored
This patch (as1583) changes ehci-hcd to use an hrtimer event for unlinking empty (unused) async QHs instead of using a kernel timer. The check for empty QHs is moved to a new routine, where it doesn't require going through an entire scan of both the async and periodic schedules. And it can unlink multiple QHs at once, unlike the current code. Signed-off-by:
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Alan Stern authored
This patch (as1582) changes ehci-hcd's strategy for unlinking async QHs. Currently the driver never unlinks more than one QH at a time. This can be inefficient and cause unnecessary delays, since a QH cannot be reused while it is waiting to be unlinked. The new strategy unlinks all the waiting QHs at once. In practice the improvement won't be very big, because it's somewhat uncommon to have two or more QHs waiting to be unlinked at any time. But it does happen, and in any case, doing things this way makes more sense IMO. The change requires the async unlinking code to be refactored slightly. Now in addition to the routines for starting and ending an unlink, there are new routines for unlinking a single QH and starting an IAA cycle. This approach is needed because there are two separate paths for unlinking async QHs: When a transfer error occurs or an URB is cancelled, the QH must be unlinked right away; When a QH has been idle sufficiently long, it is unlinked to avoid consuming DMA bandwidth uselessly. In the first case we want the unlink to proceed as quickly as possible, whereas in the second case we can afford to batch several QHs together and unlink them all at once. Hence the division of labor. Signed-off-by:
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Alan Stern authored
This patch (as1581) replaces the iaa_watchdog kernel timer used by ehci-hcd with an hrtimer event, in keeping with the general conversion to high-res timers. Signed-off-by:
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Alan Stern authored
This patch (as1580) makes ehci_iso_stream structures behave more like QHs, in that they will remain allocated until their isochronous endpoint is disabled. This will come in useful in the future, when periodic bandwidth gets allocated as an altsetting is installed rather than on-the-fly. For now, the change to the ehci_iso_stream lifetimes means that each structure is always deallocated at exactly one spot in ehci_endpoint_disable() and never used again. As a result, it is no longer necessary to use reference counting on these things, and the patch removes it. Signed-off-by:
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Alan Stern authored
This patch (as1579) adds an hrtimer event to handle deallocation of iTDs and siTDs in ehci-hcd. Because of the frame-oriented approach used by the EHCI periodic schedule, the hardware can continue to access the Transfer Descriptor for isochronous (or split-isochronous) transactions for up to a millisecond after the transaction completes. The iTD (or siTD) must not be reused before then. The strategy currently used involves putting completed iTDs on a list of cached entries and every so often returning them to the endpoint's free list. The new strategy reduces overhead by putting completed iTDs back on the free list immediately, although they are not reused until it is safe to do so. When the isochronous endpoint stops (its queue becomes empty), the iTDs on its free list get moved to a global list, from which they will be deallocated after a minimum of 2 ms. This delay is what the new hrtimer event is for. Overall this may not be a tremendous improvement over the current code, but to me it seems a lot more clear and logical. In addition, it removes the need for each iTD to keep a reference to the ehci_iso_stream it belongs to, since the iTD never needs to be moved back to the stream's free list from the global list. Signed-off-by:
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Alan Stern authored
This patch (as1578) adds an hrtimer event to handle the death of an EHCI controller. When a controller dies, it doesn't necessarily stop running right away. The new event polls at 1-ms intervals to see when all activity has safely stopped. This replaces a busy-wait polling loop in the current code. Signed-off-by:
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Alan Stern authored
This patch (as1577) adds hrtimer support for unlinking interrupt QHs in ehci-hcd. The current code relies on a fixed delay of either 2 or 55 us, which is not always adequate and in any case is totally bogus. Thanks to internal caching, the EHCI hardware may continue to access an interrupt QH for more than a millisecond after it has been unlinked. In fact, the EHCI spec doesn't say how long to wait before using an unlinked interrupt QH. The patch sets the delay to 9 microframes minimum, which ought to be adequate. Signed-off-by:
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Alan Stern authored
This patch (as1576) adds hrtimer support for managing ehci-hcd's async schedule. Just as with the earlier change to the periodic schedule management, two new hrtimer events take care of everything. One event polls at 1-ms intervals to see when the Asynchronous Schedule Status (ASS) flag matches the Asynchronous Schedule Enable (ASE) value; the schedule's state must not be changed until it does. The other event delays for 15 ms after the async schedule becomes empty before turning it off. The new events replace a busy-wait poll and a kernel timer usage. They also replace the rather illogical method currently used for indicating the async schedule should be turned off: attempting to unlink the dedicated QH at the head of the async list. Signed-off-by:
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Alan Stern authored
This patch (as1575) removes special code added for status polling of the EHCI controller in PS3 systems. While the controller is running, the polling is now carried out by an hrtimer handler. When the controller is suspending or stopping, we use the same polling routine as the old code -- but in neither case do we need to conclude that the controller has died if the polling goes on for too long. As a result the entire handshake_on_error_set_halt() routine is now unused, so it is removed from the driver. Signed-off-by:
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Alan Stern authored
This patch (as1574) changes the return type of multiple functions in ehci-sched.c from int to void. The values they return are now always 0, so there's no reason for them to return any value at all. Signed-off-by:
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Alan Stern authored
This patch (as1573) adds hrtimer support for managing ehci-hcd's periodic schedule. There are two issues to deal with. First, the schedule's state (on or off) must not be changed until the hardware status has caught up with the current command. This is handled by an hrtimer event that polls at 1-ms intervals to see when the Periodic Schedule Status (PSS) flag matches the Periodic Schedule Enable (PSE) value. Second, the schedule should not be turned off as soon as it becomes empty. Turning the schedule on and off takes time, so we want to wait until the schedule has been empty for a suitable period before turning it off. This is handled by an hrtimer event that gets set to expire 10 ms after the periodic schedule becomes empty. The existing code polls (for up to 1125 us and with interrupts disabled!) to check the status, and doesn't implement a delay before turning off the schedule. Furthermore, if the polling fails then the driver decides that the controller has died. This has caused problems for several people; some controllers can take 10 ms or more to turn off their periodic schedules. This patch fixes these issues. It also makes the "broken_periodic" workaround unnecessary; there is no longer any danger of turning off the periodic schedule after it has been on for less than 1 ms. Signed-off-by:
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Alan Stern authored
This patch (as1572) begins the conversion of ehci-hcd over to using high-resolution timers rather than old-fashioned low-resolution kernel timers. This reduces overhead caused by timer roundoff on systems where HZ is smaller than 1000. Also, the new timer framework introduced here is much more logical and easily extended than the ad-hoc approach ehci-hcd currently uses for timers. An hrtimer structure is added to ehci_hcd, along with a bitflag array and an array of ktime_t values, to keep track of which timing events are pending and what their expiration times are. Only the infrastructure for the timing operations is added in this patch. Later patches will add routines for handling each of the various timing events the driver needs. In some cases the new hrtimer handlers will replace the existing handlers for ehci-hcd's kernel timers; as this happens the old timers will be removed. In other cases the new timing events will replace busy-wait loops. Signed-off-by:
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Alan Stern authored
This patch (as1571) adds a new state for ehci-hcd's root hubs: EHCI_RH_STOPPING. This value is used at times when the root hub is being stopped and we don't know whether or not the hardware has finished all its DMA yet. Although the purpose may not be apparent, this distinction will come in useful later on. Future patches will avoid actions that depend on the root hub being operational (like turning on the async or periodic schedules) when they see the state is EHCI_RH_STOPPING. Signed-off-by:
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Alan Stern authored
This patch (as1570) adds a pointer for the end of ehci-hcd's async-unlink list. The list (which is actually a queue) is singly linked, so having a pointer to its end makes adding new entries easier -- there's no longer any need to scan through the whole list. In principle it could be changed to a standard doubly-linked list. It turns out that doing so actually makes the code less clear, so I'm leaving it as is. Signed-off-by:
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Alan Stern authored
This patch (as1569) renames the ehci->reclaim list in ehci-hcd. The word "reclaim" is used in the EHCI specification to mean something quite different, and "unlink_next" is more descriptive of the list's purpose anyway. Similarly, the "reclaim" field in the ehci_stats structure is renamed "iaa", which is more meaningful (to experts, anyway) and is a better match for the "lost_iaa" field. Signed-off-by:
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Alan Stern authored
This patch (as1568) introduces symbolic constants for some of the less-frequently used bitfields in the QH structure. This makes the code a little easier to read and understand. Signed-off-by:
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Alan Stern authored
This patch (as1567) removes ehci-hcd's reference counting of QH structures. It's not necessary to refcount these things because they always get deallocated at exactly one spot in ehci_endpoint_disable() (except for two special QHs, ehci->async and ehci->dummy) and are never used again. Signed-off-by:
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Alan Stern authored
This patch (as1566) removes the code in ehci-hcd's resume routines which tries to restart or cancel any transfers left active while the root hub or controller was asleep. This code isn't necessary, because all URBs are terminated before the root hub is suspended. Signed-off-by:
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Alan Stern authored
Currently, EHCI initialization turns off the controller (in case it was left running by the firmware) before setting up the ehci_hcd data structure. This patch (as1565) reverses that order. Although it doesn't matter now, it will matter later on when future additions to ehci_halt() will want to acquire a spinlock that gets initialized by ehci_init(). Signed-off-by:
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Namjae Jeon authored
Update information of Seagate Portable HDD and WD My Passport HDD in quirk list. Signed-off-by:
Namjae Jeon <namjae.jeon@samsung.com> Signed-off-by:
Pankaj Kumar <pankaj.km@samsung.com> Signed-off-by:
Amit Sahrawat <a.sahrawat@samsung.com> Acked-by:
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Namjae Jeon authored
Add support for write cache quirk on usb hdd. scsi driver will be set to wce by detecting write cache quirk in quirk list when plugging usb hdd. Signed-off-by:
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