Linux Kernel https://git.stealer.net/cgit.cgi/user/sven/linux.git/atom?h=leds%2Fmaster 2014-09-28T23:59:09Z 2014-09-28T23:59:09Z Michal Simek michal.simek@xilinx.com 2014-09-28T23:50:05Z urn:sha1:4e2bec0c327025671c1ec2101660e8fea29d9d89 New TTCs support 32bit mode. Older versions support only 16bit modes. Keep 16bit mode as default and 32bit optional. Signed-off-by: Michal Simek <michal.simek@xilinx.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> 2014-05-20T14:16:05Z Michal Simek michal.simek@xilinx.com 2014-04-11T13:39:29Z urn:sha1:87ab4361beed9960687eb60f0da79f85293d1ade For supporting ARM big-endian is necessary to use proper IO endianess accessors. Based on Ben Dooks BE guide. Similar conversion is done here: "mv_xor: use {readl, writel}_relaxed instead of __raw_{readl, writel}" (sha1: 5733c38ae3473115ac7df3fe19bd2502149d8c51) Signed-off-by: Michal Simek <michal.simek@xilinx.com> 2014-03-11T22:10:03Z Soren Brinkmann soren.brinkmann@xilinx.com 2014-02-19T23:14:42Z urn:sha1:b3e90722f6f53fa457a88146a877e34ea71d25ea The currently used method adjusting the clocksource to a changing input frequency does not work on kernels from 3.11 on. The new approach is to keep the timer frequency as constant as possible. I.e. - due to the TTC's prescaler limitations, allow frequency changes only if the frequency scales by a power of 2 - adjust the counter's divider on the fly when a frequency change occurs This limits cpufreq to scale by certain factors only. But we may keep the time base somewhat constant, so that sleep() & co keep working as expected, while supporting cpufreq. Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Acked-by: Michal Simek <michal.simek@xilinx.com> 2014-03-11T22:05:18Z Soren Brinkmann soren.brinkmann@xilinx.com 2014-02-19T23:14:41Z urn:sha1:5f0ba3b462b2d36b3c28748863747fb1050f40d0 The timer core takes care of serialization and IRQs. Hence the driver is no longer required to disable interrupts when calling clockevents_update_freq(). Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Acked-by: Michal Simek <michal.simek@xilinx.com> 2014-01-20T19:34:26Z Linus Torvalds torvalds@linux-foundation.org 2014-01-20T19:34:26Z urn:sha1:6c6461435611e1d4843516f2d55e8316c009112e Pull timer changes from Ingo Molnar: - ARM clocksource/clockevent improvements and fixes - generic timekeeping updates: TAI fixes/improvements, cleanups - Posix cpu timer cleanups and improvements - dynticks updates: full dynticks bugfixes, optimizations and cleanups * 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (46 commits) clocksource: Timer-sun5i: Switch to sched_clock_register() timekeeping: Remove comment that's mostly out of date rtc-cmos: Add an alarm disable quirk timekeeper: fix comment typo for tk_setup_internals() timekeeping: Fix missing timekeeping_update in suspend path timekeeping: Fix CLOCK_TAI timer/nanosleep delays tick/timekeeping: Call update_wall_time outside the jiffies lock timekeeping: Avoid possible deadlock from clock_was_set_delayed timekeeping: Fix potential lost pv notification of time change timekeeping: Fix lost updates to tai adjustment clocksource: sh_cmt: Add clk_prepare/unprepare support clocksource: bcm_kona_timer: Remove unused bcm_timer_ids clocksource: vt8500: Remove deprecated IRQF_DISABLED clocksource: tegra: Remove deprecated IRQF_DISABLED clocksource: misc drivers: Remove deprecated IRQF_DISABLED clocksource: sh_mtu2: Remove unnecessary platform_set_drvdata() clocksource: sh_tmu: Remove unnecessary platform_set_drvdata() clocksource: armada-370-xp: Enable timer divider only when needed clocksource: clksrc-of: Warn if no clock sources are found clocksource: orion: Switch to sched_clock_register() ... 2013-12-30T10:32:24Z Soren Brinkmann soren.brinkmann@xilinx.com 2013-11-27T01:04:50Z urn:sha1:c1dcc927dae01dfd4904ee82ce2c00b50eab6dc3 When the kernel is compiled with: CONFIG_HIGH_RES_TIMERS=no CONFIG_HZ_PERIODIC=yes CONFIG_DEBUG_ATOMIC_SLEEP=yes The following WARN appears: WARNING: CPU: 1 PID: 0 at linux/kernel/mutex.c:856 mutex_trylock+0x70/0x1fc() DEBUG_LOCKS_WARN_ON(in_interrupt()) Modules linked in: CPU: 1 PID: 0 Comm: swapper/1 Not tainted 3.12.0-xilinx-dirty #93 [<c0014a78>] (unwind_backtrace+0x0/0x11c) from [<c0011b6c>] (show_stack+0x10/0x14) [<c0011b6c>] (show_stack+0x10/0x14) from [<c039120c>] (dump_stack+0x7c/0xc0) [<c039120c>] (dump_stack+0x7c/0xc0) from [<c001fda4>] (warn_slowpath_common+0x60/0x84) [<c001fda4>] (warn_slowpath_common+0x60/0x84) from [<c001fe48>] (warn_slowpath_fmt+0x2c/0x3c) [<c001fe48>] (warn_slowpath_fmt+0x2c/0x3c) from [<c0392658>] (mutex_trylock+0x70/0x1fc) [<c0392658>] (mutex_trylock+0x70/0x1fc) from [<c02dfc08>] (clk_prepare_lock+0xc/0xe4) [<c02dfc08>] (clk_prepare_lock+0xc/0xe4) from [<c02e099c>] (clk_get_rate+0xc/0x44) [<c02e099c>] (clk_get_rate+0xc/0x44) from [<c02d0394>] (ttc_set_mode+0x34/0x78) [<c02d0394>] (ttc_set_mode+0x34/0x78) from [<c005f794>] (clockevents_set_mode+0x28/0x5c) [<c005f794>] (clockevents_set_mode+0x28/0x5c) from [<c00607fc>] (tick_broadcast_on_off+0x190/0x1c0) [<c00607fc>] (tick_broadcast_on_off+0x190/0x1c0) from [<c005f168>] (clockevents_notify+0x58/0x1ac) [<c005f168>] (clockevents_notify+0x58/0x1ac) from [<c02b99dc>] (cpuidle_setup_broadcast_timer+0x20/0x24) [<c02b99dc>] (cpuidle_setup_broadcast_timer+0x20/0x24) from [<c006cd04>] (generic_smp_call_function_single_interrupt+0) [<c006cd04>] (generic_smp_call_function_single_interrupt+0xe0/0x130) from [<c00138c8>] (handle_IPI+0x88/0x118) [<c00138c8>] (handle_IPI+0x88/0x118) from [<c0008504>] (gic_handle_irq+0x58/0x60) [<c0008504>] (gic_handle_irq+0x58/0x60) from [<c0012644>] (__irq_svc+0x44/0x78) Exception stack(0xef099fa0 to 0xef099fe8) 9fa0: 00000001 ef092100 00000000 ef092100 ef098000 00000015 c0399f2c c0579d74 9fc0: 0000406a 413fc090 00000000 00000000 00000000 ef099fe8 c00666ec c000f46c 9fe0: 20000113 ffffffff [<c0012644>] (__irq_svc+0x44/0x78) from [<c000f46c>] (arch_cpu_idle+0x34/0x3c) [<c000f46c>] (arch_cpu_idle+0x34/0x3c) from [<c0053980>] (cpu_startup_entry+0xa8/0x10c) [<c0053980>] (cpu_startup_entry+0xa8/0x10c) from [<000085a4>] (0x85a4) We are in an interrupt context (IPI) and we are calling clk_get_rate in the set_mode function which in turn ends up by getting a mutex... Even if that does not hang, it is a potential kernel deadlock. It is not allowed to call clk_get_rate() from interrupt context. To avoid such calls the timer input frequency is stored in the driver's data struct which makes it accessible to the driver in any context. [dlezcano] completed the changelog with the WARN trace and added a more detailed description. Tested on zync zc702. Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> Tested-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> 2013-12-11T10:40:27Z Michael Opdenacker michael.opdenacker@free-electrons.com 2013-12-09T09:12:10Z urn:sha1:38c30a8421ce8b06492121deee422ba7ecfaeef2 This patch removes the use of the IRQF_DISABLED flag It's a NOOP since 2.6.35 and it will be removed one day. [dlezcano] : slightly changed the changelog Signed-off-by: Michael Opdenacker <michael.opdenacker@free-electrons.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> 2013-12-11T10:40:24Z Stephen Boyd sboyd@codeaurora.org 2013-11-19T23:47:32Z urn:sha1:dfded00902d7437963870accbcf4b39114e85f59 The 32 bit sched_clock interface now supports 64 bits. Upgrade to the 64 bit function to allow us to remove the 32 bit registration interface. Cc: Soren Brinkmann <soren.brinkmann@xilinx.com> Cc: Michal Simek <monstr@monstr.eu> Tested-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> 2013-07-18T13:27:34Z Soren Brinkmann soren.brinkmann@xilinx.com 2013-07-08T16:51:38Z urn:sha1:3d77b30efc72d126c2b74070b41a03869611228d Reuse the TTC clocksource timer as sched clock provider. Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Acked-by: Michal Simek <monstr@monstr.eu> 2013-07-18T13:27:22Z Soren Brinkmann soren.brinkmann@xilinx.com 2013-07-08T16:51:37Z urn:sha1:9bbf914043e04f65e619f3c0ff67c387812f9458 The clk-provider.h header is not required by this driver. Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>