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android_kernel_oneplus_msm8998/drivers/rtc
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Thierry Reding ba02781392 rtc: tegra: Implement clock handling 
commit 5fa4086987506b2ab8c92f8f99f2295db9918856 upstream.

Accessing the registers of the RTC block on Tegra requires the module
clock to be enabled. This only works because the RTC module clock will
be enabled by default during early boot. However, because the clock is
unused, the CCF will disable it at late_init time. This causes the RTC
to become unusable afterwards. This can easily be reproduced by trying
to use the RTC:

	$ hwclock --rtc /dev/rtc1

This will hang the system. I ran into this by following up on a report
by Martin Michlmayr that reboot wasn't working on Tegra210 systems. It
turns out that the rtc-tegra driver's ->shutdown() implementation will
hang the CPU, because of the disabled clock, before the system can be
rebooted.

What confused me for a while is that the same driver is used on prior
Tegra generations where the hang can not be observed. However, as Peter
De Schrijver pointed out, this is because on 32-bit Tegra chips the RTC
clock is enabled by the tegra20_timer.c clocksource driver, which uses
the RTC to provide a persistent clock. This code is never enabled on
64-bit Tegra because the persistent clock infrastructure does not exist
on 64-bit ARM.

The proper fix for this is to add proper clock handling to the RTC
driver in order to ensure that the clock is enabled when the driver
requires it. All device trees contain the clock already, therefore
no additional changes are required.

Reported-by: Martin Michlmayr <tbm@cyrius.com>
Acked-By Peter De Schrijver <pdeschrijver@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
[bwh: Backported to 4.9: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-04-21 09:30:07 +02:00
..
class.c rtc: switch to using is_visible() to control sysfs attributes 2015-09-05 13:19:07 +02:00
hctosys.c rtc: use more standard kernel logging styles 2015-04-17 09:04:02 -04:00
interface.c rtc: interface: ignore expired timers when enqueuing new timers 2017-02-26 11:07:49 +01:00
Kconfig rtc: Add a driver for Micro Crystal RV8803 2015-11-08 14:12:32 +01:00
Makefile rtc: Add a driver for Micro Crystal RV8803 2015-11-08 14:12:32 +01:00
rtc-88pm80x.c rtc: 88pm80x: add device tree support 2015-09-05 13:19:05 +02:00
rtc-88pm860x.c rtc: drop owner assignment from platform_drivers 2014-10-20 16:21:31 +02:00
rtc-ab-b5ze-s3.c rtc: Export OF module alias information in missing drivers 2015-09-05 13:19:08 +02:00
rtc-ab3100.c drivers/rtc/ab3100: Update driver to address y2038/y2106 issues 2015-04-03 08:18:25 +02:00
rtc-ab8500.c rtc: ab8500: remove misuse of IRQF_NO_SUSPEND flag 2015-11-08 14:12:25 +01:00
rtc-abx80x.c rtc: abx80x: fix RTC write bit 2015-09-05 19:37:31 +02:00
rtc-armada38x.c rtc: Fix module autoload for OF platform drivers 2015-09-05 19:37:22 +02:00
rtc-as3722.c rtc: as3722: correct month value 2015-09-05 19:37:18 +02:00
rtc-at32ap700x.c rtc: at32ap700x: update author email 2015-06-25 01:12:50 +02:00
rtc-at91rm9200.c rtc: at91rm9200: clear RTC alarm status flag prior to suspending 2015-11-08 14:12:28 +01:00
rtc-at91rm9200.h
rtc-at91sam9.c rtc: at91sam9: remove useless include 2015-09-05 13:19:13 +02:00
rtc-au1xxx.c rtc: drop owner assignment from platform_drivers 2014-10-20 16:21:31 +02:00
rtc-bfin.c rtc: Drop (un)likely before IS_ERR(_OR_NULL) 2015-09-05 13:19:09 +02:00
rtc-bq32k.c rtc: Drop owner assignment from i2c_driver 2015-09-05 13:19:06 +02:00
rtc-bq4802.c rtc: drop owner assignment from platform_drivers 2014-10-20 16:21:31 +02:00
rtc-cmos.c rtc: cmos: clean up cmos_nvram_read()/cmos_nvram_write() 2015-09-05 13:19:09 +02:00
rtc-coh901331.c rtc: Fix module autoload for OF platform drivers 2015-09-05 19:37:22 +02:00
rtc-core.h rtc: switch to using is_visible() to control sysfs attributes 2015-09-05 13:19:07 +02:00
rtc-da9052.c drivers/rtc/rtc-da9052.c: register ability of alarm to wake device from suspend 2015-04-17 09:04:00 -04:00
rtc-da9055.c rtc: drop owner assignment from platform_drivers 2014-10-20 16:21:31 +02:00
rtc-da9063.c rtc: da9063: fix access ordering error during RTC interrupt at system power on 2015-12-20 13:39:29 +01:00
rtc-davinci.c rtc: davinci: remove incorrect reference to probe function 2015-11-08 14:12:29 +01:00
rtc-dev.c rtc: dev: properly manage lifetime of dev and cdev in rtc device 2015-09-05 13:19:07 +02:00
rtc-digicolor.c rtc: driver for Conexant Digicolor CX92755 on-chip RTC 2015-04-17 09:04:01 -04:00
rtc-dm355evm.c rtc: drop owner assignment from platform_drivers 2014-10-20 16:21:31 +02:00
rtc-ds1216.c rtc: simplify use of devm_ioremap_resource 2015-06-25 01:13:40 +02:00
rtc-ds1286.c rtc: simplify use of devm_ioremap_resource 2015-06-25 01:13:40 +02:00
rtc-ds1302.c rtc: drop owner assignment from platform_drivers 2014-10-20 16:21:31 +02:00
rtc-ds1305.c spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
rtc-ds1307.c rtc: ds1307: fix alarm reading at probe time 2015-11-26 18:11:26 +01:00
rtc-ds1343.c RTC for 4.4 2015-11-10 10:01:21 -08:00
rtc-ds1347.c spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
rtc-ds1374.c rtc: ds1374: Remove unused variable 2015-09-05 19:37:22 +02:00
rtc-ds1390.c RTC for 4.4 2015-11-10 10:01:21 -08:00
rtc-ds1511.c rtc: ds1511: clean up ds1511_nvram_read()/ds1511_nvram_write() 2015-09-05 13:19:10 +02:00
rtc-ds1553.c rtc: ds1553: clean up ds1553_nvram_read()/ds1553_nvram_write() 2015-09-05 13:19:10 +02:00
rtc-ds1672.c rtc: ds1672, max6900, max8998: Add MODULE_DEVICE_TABLE 2015-06-25 01:13:36 +02:00
rtc-ds1685.c rtc: ds1685: passing bogus values to irq_restore 2016-05-04 14:48:51 -07:00
rtc-ds1742.c rtc: ds1742: clean up ds1742_nvram_read()/ds1742_nvram_write() 2015-09-05 13:19:10 +02:00
rtc-ds2404.c rtc: drop owner assignment from platform_drivers 2014-10-20 16:21:31 +02:00
rtc-ds3232.c rtc: ds3232: fix WARNING trace in resume function 2015-09-05 19:36:21 +02:00
rtc-ds3234.c spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
rtc-efi-platform.c rtc: use more standard kernel logging styles 2015-04-17 09:04:02 -04:00
rtc-efi.c rtc: efi: use correct EFI 'epoch' 2015-06-25 01:13:44 +02:00
rtc-em3027.c drivers/rtc/rtc-em3027.c: add device tree support 2015-04-17 09:03:59 -04:00
rtc-ep93xx.c rtc: ep93xx: Use readl/writel for io 2015-06-25 01:13:38 +02:00
rtc-fm3130.c rtc: Drop owner assignment from i2c_driver 2015-09-05 13:19:06 +02:00
rtc-gemini.c rtc: gemini: fix ptr_ret.cocci warnings 2015-09-05 13:19:09 +02:00
rtc-generic.c rtc: drop owner assignment from platform_drivers 2014-10-20 16:21:31 +02:00
rtc-hid-sensor-time.c rtc: hid-sensor-time: Constify platform_device_id 2015-06-19 20:03:20 +02:00
rtc-hym8563.c rtc: hym8563: fix invalid year calculation 2016-05-04 14:48:51 -07:00
rtc-imxdi.c rtc: imxdi: when locked, do not fail silently 2015-06-19 20:03:21 +02:00
rtc-isl1208.c rtc: isl1208: Pass the IRQF_ONESHOT flag 2015-11-08 14:12:30 +01:00
rtc-isl12022.c rtc: Export OF module alias information in missing drivers 2015-09-05 13:19:08 +02:00
rtc-isl12057.c rtc: isl12057: enable support for the standard "wakeup-source" property 2015-11-08 14:12:30 +01:00
rtc-jz4740.c rtc: drop owner assignment from platform_drivers 2014-10-20 16:21:31 +02:00
rtc-lib.c rtc/lib: Provide y2038 safe rtc_tm_to_time()/rtc_time_to_tm() replacement 2014-11-21 12:00:00 -08:00
rtc-lp8788.c rtc: drop owner assignment from platform_drivers 2014-10-20 16:21:31 +02:00
rtc-lpc24xx.c rtc: add rtc-lpc24xx driver 2015-09-05 13:19:06 +02:00
rtc-lpc32xx.c rtc: drop owner assignment from platform_drivers 2014-10-20 16:21:31 +02:00
rtc-ls1x.c MIPS: Loongson: Naming style cleanup and rework 2015-06-21 21:53:59 +02:00
rtc-m41t80.c rtc: use more standard kernel logging styles 2015-04-17 09:04:02 -04:00
rtc-m41t93.c spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
rtc-m41t94.c spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
rtc-m48t35.c rtc: drop owner assignment from platform_drivers 2014-10-20 16:21:31 +02:00
rtc-m48t59.c rtc: m48t59: clean up m48t59_nvram_read()/m48t59_nvram_write() 2015-09-05 13:19:10 +02:00
rtc-m48t86.c rtc: drop owner assignment from platform_drivers 2014-10-20 16:21:31 +02:00
rtc-max6900.c rtc: ds1672, max6900, max8998: Add MODULE_DEVICE_TABLE 2015-06-25 01:13:36 +02:00
rtc-max6902.c spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
rtc-max8907.c rtc: drop owner assignment from platform_drivers 2014-10-20 16:21:31 +02:00
rtc-max8925.c rtc: drop owner assignment from platform_drivers 2014-10-20 16:21:31 +02:00
rtc-max8997.c rtc: Fix module autoload for rtc-{ab8500,max8997,s5m} drivers 2015-09-05 19:37:21 +02:00
rtc-max8998.c rtc: ds1672, max6900, max8998: Add MODULE_DEVICE_TABLE 2015-06-25 01:13:36 +02:00
rtc-max77686.c rtc: max77686: Properly handle regmap_irq_get_virq() error code 2016-05-04 14:48:52 -07:00
rtc-max77802.c rtc: max77802: Report platform modalias to fix module autoload 2015-06-25 01:13:37 +02:00
rtc-mc13xxx.c rtc: mc13xxx: fix obfuscated and wrong format string 2015-06-25 01:13:35 +02:00
rtc-mcp795.c spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
rtc-moxart.c rtc: Fix module autoload for OF platform drivers 2015-09-05 19:37:22 +02:00
rtc-mpc5121.c rtc: Fix module autoload for OF platform drivers 2015-09-05 19:37:22 +02:00
rtc-mrst.c rtc: remove use of seq_printf return value 2015-04-15 16:35:24 -07:00
rtc-msm6242.c rtc: use more standard kernel logging styles 2015-04-17 09:04:02 -04:00
rtc-mt6397.c rtc: Fix module autoload for OF platform drivers 2015-09-05 19:37:22 +02:00
rtc-mv.c rtc: Fix module autoload for OF platform drivers 2015-09-05 19:37:22 +02:00
rtc-mxc.c rtc: mxc: add support of device tree 2015-08-05 20:03:56 +08:00
rtc-nuc900.c rtc: drop owner assignment from platform_drivers 2014-10-20 16:21:31 +02:00
rtc-omap.c rtc: omap: Fix selecting external osc 2016-11-26 09:54:53 +01:00
rtc-opal.c rtc: opal: enable support for the stardard "wakeup-source" property 2015-11-08 14:12:30 +01:00
rtc-palmas.c rtc: palmas: Initialise bb_charging flag before using it 2015-06-25 01:13:40 +02:00
rtc-pcap.c rtc: drop owner assignment from platform_drivers 2014-10-20 16:21:31 +02:00
rtc-pcf2123.c spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
rtc-pcf2127.c rtc: pcf2127: remove useless driver version 2015-11-08 14:12:28 +01:00
rtc-pcf8523.c rtc: Drop owner assignment from i2c_driver 2015-09-05 13:19:06 +02:00
rtc-pcf8563.c rtc: pcf8563: add CLKOUT to common clock framework 2015-11-08 14:12:29 +01:00
rtc-pcf8583.c rtc: Drop owner assignment from i2c_driver 2015-09-05 13:19:06 +02:00
rtc-pcf50633.c
rtc-pcf85063.c rtc: pcf85063: return an error when date is invalid 2015-11-08 14:12:26 +01:00
rtc-pl030.c drivers/rtc/rtc-pl030.c: use devm_kzalloc() instead of kmalloc() 2013-11-13 12:09:31 +09:00
rtc-pl031.c rtc: pl031: remove misuse of IRQF_NO_SUSPEND flag 2015-11-08 14:12:24 +01:00
rtc-pm8xxx.c Merge branch 'platform/remove_owner' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux into driver-core-next 2014-11-03 19:53:56 -08:00
rtc-proc.c
rtc-ps3.c rtc: drop owner assignment from platform_drivers 2014-10-20 16:21:31 +02:00
rtc-puv3.c rtc: drop owner assignment from platform_drivers 2014-10-20 16:21:31 +02:00
rtc-pxa.c rtc: sa1100/pxa: convert to run-time register mapping 2015-09-05 19:37:16 +02:00
rtc-r9701.c spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
rtc-rc5t583.c rtc: drop owner assignment from platform_drivers 2014-10-20 16:21:31 +02:00
rtc-rk808.c rtc: rk808: Compensate for Rockchip calendar deviation on November 31st 2015-12-20 13:39:00 +01:00
rtc-rp5c01.c rtc: rp5c01: clean up rp5c01_nvram_read()/rp5c01_nvram_write() 2015-09-05 13:19:10 +02:00
rtc-rs5c313.c rtc: drop owner assignment from platform_drivers 2014-10-20 16:21:31 +02:00
rtc-rs5c348.c spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
rtc-rs5c372.c drivers/rtc/rtc-rs5c372.c: use %*ph to dump small buffers 2014-10-14 02:18:19 +02:00
rtc-rv3029c2.c drivers/rtc/rtc-rv3029c2.c: fix potential race condition 2014-04-03 16:21:24 -07:00
rtc-rv8803.c rtc: Add a driver for Micro Crystal RV8803 2015-11-08 14:12:32 +01:00
rtc-rx4581.c spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
rtc-rx8025.c rtc: rx8025: remove rv8803 id 2016-05-04 14:48:52 -07:00
rtc-rx8581.c rtc: Drop owner assignment from i2c_driver 2015-09-05 13:19:06 +02:00
rtc-s3c.c rtc: s3c: Add s3c_rtc_{enable/disable}_clk in s3c_rtc_setfreq() 2016-08-20 18:09:27 +02:00
rtc-s3c.h
rtc-s5m.c rtc: Fix module autoload for rtc-{ab8500,max8997,s5m} drivers 2015-09-05 19:37:21 +02:00
rtc-s35390a.c rtc: s35390a: improve irq handling 2017-04-08 09:53:32 +02:00
rtc-sa1100.c rtc: sa1100/pxa: convert to run-time register mapping 2015-09-05 19:37:16 +02:00
rtc-sa1100.h rtc: sa1100/pxa: convert to run-time register mapping 2015-09-05 19:37:16 +02:00
rtc-sh.c rtc: drop owner assignment from platform_drivers 2014-10-20 16:21:31 +02:00
rtc-sirfsoc.c rtc: sirfsoc: move to regmap APIs from platform-specific APIs 2015-09-05 13:19:06 +02:00
rtc-snvs.c rtc: snvs: use syscon to access register 2015-07-15 10:15:10 +08:00
rtc-spear.c rtc: simplify use of devm_ioremap_resource 2015-06-25 01:13:40 +02:00
rtc-st-lpc.c rtc: st: Update IP layout information to include Clocksource 2015-07-23 17:07:35 +01:00
rtc-starfire.c rtc: drop owner assignment from platform_drivers 2014-10-20 16:21:31 +02:00
rtc-stk17ta8.c rtc: stk17ta8: clean up stk17ta8_nvram_read()/stk17ta8_nvram_write() 2015-09-05 13:19:10 +02:00
rtc-stmp3xxx.c rtc: stmp3xxx: unify register access macros 2015-11-08 14:12:27 +01:00
rtc-sun4v.c rtc: drop owner assignment from platform_drivers 2014-10-20 16:21:31 +02:00
rtc-sun6i.c rtc: sun6i: Switch to the external oscillator 2017-03-12 06:37:30 +01:00
rtc-sunxi.c rtc: sunxi: Replace deprecated rtc_tm_to_time() 2015-06-25 01:13:42 +02:00
rtc-sysfs.c rtc: switch to using is_visible() to control sysfs attributes 2015-09-05 13:19:07 +02:00
rtc-tegra.c rtc: tegra: Implement clock handling 2017-04-21 09:30:07 +02:00
rtc-test.c drivers/rtc/test: Update driver to address y2038/y2106 issues 2015-04-03 08:18:24 +02:00
rtc-tile.c rtc: drop owner assignment from platform_drivers 2014-10-20 16:21:31 +02:00
rtc-tps6586x.c rtc: drop owner assignment from platform_drivers 2014-10-20 16:21:31 +02:00
rtc-tps65910.c rtc: drop owner assignment from platform_drivers 2014-10-20 16:21:31 +02:00
rtc-tps80031.c rtc: drop owner assignment from platform_drivers 2014-10-20 16:21:31 +02:00
rtc-twl.c rtc: use more standard kernel logging styles 2015-04-17 09:04:02 -04:00
rtc-tx4939.c rtc: tx4939: clean up tx4939_rtc_nvram_read()/tx4939_rtc_nvram_write() 2015-09-05 13:19:10 +02:00
rtc-v3020.c rtc: rtc-v3020: use gpio_request_array() 2015-06-25 01:13:38 +02:00
rtc-vr41xx.c rtc: vr41xx: Wire up alarm_irq_enable 2016-05-04 14:48:51 -07:00
rtc-vt8500.c rtc: Fix module autoload for OF platform drivers 2015-09-05 19:37:22 +02:00
rtc-wm831x.c drivers/rtc/rtc-wm831x.c: remove empty function 2013-07-03 16:07:59 -07:00
rtc-wm8350.c
rtc-x1205.c drivers/rtc/rtc-x1205.c: use sign_extend32() for sign extension 2015-04-17 09:03:59 -04:00
rtc-xgene.c rtc: drop owner assignment from platform_drivers 2014-10-20 16:21:31 +02:00
rtc-zynqmp.c rtc: add xilinx zynqmp rtc driver 2015-09-05 19:37:19 +02:00
systohc.c rtc: NTP: Add CONFIG_RTC_SYSTOHC_DEVICE for NTP synchronization 2015-06-25 01:13:42 +02:00