Mateusz Jończyk dc62f05f66 rtc: cmos: avoid UIP when reading alarm time ... [ Upstream commit cdedc45c57 ] Some Intel chipsets disconnect the time and date RTC registers when the clock update is in progress: during this time reads may return bogus values and writes fail silently. This includes the RTC alarm registers. [1] cmos_read_alarm() did not take account for that, which caused alarm time reads to sometimes return bogus values. This can be shown with a test patch that I am attaching to this patch series. Fix this, by using mc146818_avoid_UIP(). [1] 7th Generation Intel ® Processor Family I/O for U/Y Platforms [...] Datasheet, Volume 1 of 2 (Intel's Document Number: 334658-006) Page 208 https://www.intel.com/content/dam/www/public/us/en/documents/datasheets/7th-and-8th-gen-core-family-mobile-u-y-processor-lines-i-o-datasheet-vol-1.pdf "If a RAM read from the ten time and date bytes is attempted during an update cycle, the value read do not necessarily represent the true contents of those locations. Any RAM writes under the same conditions are ignored." Signed-off-by: Mateusz Jończyk <mat.jonczyk@o2.pl> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Alexandre Belloni <alexandre.belloni@bootlin.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Link: https://lore.kernel.org/r/20211210200131.153887-9-mat.jonczyk@o2.pl Signed-off-by: Sasha Levin <sashal@kernel.org>		2022-12-14 11:37:18 +01:00
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Kconfig	rtc: rx8010: select REGMAP_I2C	2021-09-09 10:18:40 +02:00
Makefile	rtc: move RTC_LIB_KUNIT_TEST to proper location	2021-08-10 23:22:20 +02:00
class.c	rtc: fix use-after-free on device removal	2022-05-25 09:57:23 +02:00
dev.c	…
interface.c	rtc: check if __rtc_read_time was successful	2022-04-08 14:24:10 +02:00
lib.c	rtc: Improve performance of rtc_time64_to_tm(). Add tests.	2021-08-10 00:09:21 +02:00
lib_test.c	rtc: lib_test: add MODULE_LICENSE	2021-08-10 23:21:46 +02:00
nvmem.c	…
proc.c	rtc: fix snprintf() checking in is_rtc_hctosys()	2021-05-25 00:36:11 +02:00
rtc-88pm80x.c	…
rtc-88pm860x.c	…
rtc-ab-b5ze-s3.c	…
rtc-ab-eoz9.c	rtc: ab-eoz9: make use of RTC_FEATURE_ALARM	2021-04-17 00:07:16 +02:00
rtc-ab8500.c	…
rtc-abx80x.c	…
rtc-ac100.c	…
rtc-armada38x.c	…
rtc-as3722.c	…
rtc-asm9260.c	…
rtc-aspeed.c	…
rtc-at91rm9200.c	…
rtc-at91sam9.c	rtc: at91sam9: Remove unnecessary offset variable checks	2021-07-10 02:42:08 +02:00
rtc-au1xxx.c	rtc: au1xxx: convert to SPDX identifier	2021-07-10 01:53:39 +02:00
rtc-bd70528.c	rtc: bd70528: Drop BD70528 support	2021-06-20 22:24:52 +02:00
rtc-bq32k.c	…
rtc-bq4802.c	…
rtc-brcmstb-waketimer.c	…
rtc-cadence.c	…
rtc-cmos.c	rtc: cmos: avoid UIP when reading alarm time	2022-12-14 11:37:18 +01:00
rtc-core.h	…
rtc-cpcap.c	…
rtc-cros-ec.c	…
rtc-da9052.c	…
rtc-da9055.c	…
rtc-da9063.c	…
rtc-davinci.c	…
rtc-digicolor.c	…
rtc-dm355evm.c	…
rtc-ds1216.c	…
rtc-ds1286.c	…
rtc-ds1302.c	rtc: ds1302: Add SPI ID table	2021-11-18 19:16:58 +01:00
rtc-ds1305.c	…
rtc-ds1307.c	rtc: ds1307: Fix wday settings for rx8130	2021-04-29 23:37:18 +02:00
rtc-ds1343.c	…
rtc-ds1347.c	…
rtc-ds1374.c	rtc: ds1374: convert to SPDX identifier	2021-07-10 01:53:39 +02:00
rtc-ds1390.c	rtc: ds1390: Add SPI ID table	2021-11-18 19:16:59 +01:00
rtc-ds1511.c	rtc: ds1511: remove unused function	2021-04-17 11:21:04 +02:00
rtc-ds1553.c	…
rtc-ds1672.c	…
rtc-ds1685.c	…
rtc-ds1742.c	…
rtc-ds2404.c	…
rtc-ds3232.c	…
rtc-efi.c	rtc: efi: Remove the repeated module alias	2021-05-25 00:39:58 +02:00
rtc-em3027.c	…
rtc-ep93xx.c	…
rtc-fm3130.c	…
rtc-fsl-ftm-alarm.c	rtc: fsl-ftm-alarm: add MODULE_TABLE()	2021-04-17 11:21:04 +02:00
rtc-ftrtc010.c	rtc: ftrtc010: Fix error handling in ftrtc010_rtc_probe	2022-06-14 18:36:07 +02:00
rtc-generic.c	…
rtc-goldfish.c	…
rtc-hid-sensor-time.c	iio: hid-sensors: lighten exported symbols by moving to IIO_HID namespace	2021-06-16 14:53:13 +01:00
rtc-hym8563.c	…
rtc-imx-sc.c	rtc: imx-sc: remove .read_alarm	2021-04-29 23:03:26 +02:00
rtc-imxdi.c	rtc: imxdi: add wakeup support	2021-05-25 00:41:25 +02:00
rtc-isl1208.c	…
rtc-isl12022.c	…
rtc-isl12026.c	…
rtc-jz4740.c	…
rtc-lp8788.c	…
rtc-lpc24xx.c	…
rtc-lpc32xx.c	…
rtc-ls1x.c	…
rtc-m41t80.c	rtc: m41t80: correct kerneldoc function names	2021-06-20 22:19:46 +02:00
rtc-m41t93.c	…
rtc-m41t94.c	…
rtc-m48t35.c	…
rtc-m48t59.c	…
rtc-m48t86.c	…
rtc-max6900.c	rtc: max6900: convert to SPDX identifier	2021-07-10 01:53:39 +02:00
rtc-max6902.c	…
rtc-max6916.c	…
rtc-max8907.c	…
rtc-max8925.c	…
rtc-max8997.c	…
rtc-max8998.c	…
rtc-max77686.c	rtc: max77686: Do not enforce (incorrect) interrupt trigger type	2021-06-20 22:22:13 +02:00
rtc-mc13xxx.c	…
rtc-mc146818-lib.c	rtc: mc146818-lib: extract mc146818_avoid_UIP	2022-12-14 11:37:18 +01:00
rtc-mcp795.c	rtc: mcp795: Add SPI ID table	2021-11-18 19:16:59 +01:00
rtc-meson-vrtc.c	…
rtc-meson.c	…
rtc-moxart.c	…
rtc-mpc5121.c	…
rtc-msm6242.c	…
rtc-mt2712.c	…
rtc-mt6397.c	rtc: mt6397: check return value after calling platform_get_resource()	2022-06-14 18:36:07 +02:00
rtc-mt7622.c	…
rtc-mv.c	…
rtc-mxc.c	…
rtc-mxc_v2.c	rtc: mxc_v2: add missing MODULE_DEVICE_TABLE	2021-05-25 00:33:17 +02:00
rtc-ntxec.c	…
rtc-omap.c	rtc: omap: use rtc_write to access OMAP_RTC_OSC_REG	2021-04-29 23:37:18 +02:00
rtc-opal.c	…
rtc-palmas.c	rtc: palmas: convert to SPDX identifier	2021-07-10 01:53:39 +02:00
rtc-pcap.c	…
rtc-pcf2123.c	rtc: pcf2123: Add SPI ID table	2021-11-18 19:16:59 +01:00
rtc-pcf2127.c	rtc: pcf2127: fix bug when reading alarm registers	2022-05-25 09:57:23 +02:00
rtc-pcf8523.c	rtc: pcf8523: rename register and bit defines	2021-07-10 23:18:30 +02:00
rtc-pcf8563.c	rtc: pcf8563: Fix the datasheet URL	2021-06-20 23:48:35 +02:00
rtc-pcf8583.c	…
rtc-pcf50633.c	…
rtc-pcf85063.c	rtc: pcf85063: Update the PCF85063A datasheet revision	2021-07-10 01:40:49 +02:00
rtc-pcf85363.c	…
rtc-pic32.c	…
rtc-pl030.c	…
rtc-pl031.c	rtc: pl031: fix rtc features null pointer dereference	2022-04-08 14:22:56 +02:00
rtc-pm8xxx.c	rtc: pm8xxx: Add RTC support for PMIC PMK8350	2021-04-17 00:20:01 +02:00
rtc-ps3.c	…
rtc-pxa.c	rtc: pxa: fix null pointer dereference	2022-01-27 11:05:34 +01:00
rtc-r7301.c	…
rtc-r9701.c	…
rtc-rc5t583.c	…
rtc-rc5t619.c	…
rtc-rk808.c	…
rtc-rp5c01.c	…
rtc-rs5c313.c	…
rtc-rs5c348.c	…
rtc-rs5c372.c	…
rtc-rtd119x.c	rtc: rtd119x: Fix format of SPDX identifier	2021-07-10 01:53:39 +02:00
rtc-rv3028.c	…
rtc-rv3029c2.c	…
rtc-rv3032.c	rtc: rv3032: fix error handling in rv3032_clkout_set_rate()	2021-11-18 19:17:01 +01:00
rtc-rv8803.c	…
rtc-rx4581.c	…
rtc-rx6110.c	…
rtc-rx8010.c	…
rtc-rx8025.c	rtc: rx8025: fix 12/24 hour mode detection on RX-8035	2022-08-17 14:22:53 +02:00
rtc-rx8581.c	…
rtc-s3c.c	…
rtc-s3c.h	…
rtc-s5m.c	rtc: s5m: set range	2021-08-06 10:31:59 +02:00
rtc-s35390a.c	…
rtc-sa1100.c	…
rtc-sa1100.h	…
rtc-sc27xx.c	rtc: sc27xx: Fix format of SPDX identifier	2021-07-10 01:53:39 +02:00
rtc-sd3078.c	…
rtc-sh.c	…
rtc-snvs.c	…
rtc-spear.c	rtc: spear: convert to SPDX identifier	2021-07-10 01:53:57 +02:00
rtc-st-lpc.c	…
rtc-starfire.c	…
rtc-stk17ta8.c	…
rtc-stm32.c	rtc: stm32: Fix unbalanced clk_disable_unprepare() on probe error path	2021-06-20 22:28:02 +02:00
rtc-stmp3xxx.c	…
rtc-sun4v.c	…
rtc-sun6i.c	rtc: sun6i: Fix time overflow handling	2022-05-25 09:57:24 +02:00
rtc-sunxi.c	…
rtc-tegra.c	…
rtc-test.c	…
rtc-tps6586x.c	rtc: tps6586x: convert to SPDX identifier	2021-07-10 01:53:40 +02:00
rtc-tps65910.c	rtc: tps65910: Correct driver module alias	2021-08-17 23:36:22 +02:00
rtc-tps80031.c	rtc: tps80031: convert to SPDX identifier	2021-07-10 01:53:39 +02:00
rtc-twl.c	…
rtc-v3020.c	rtc: v3020: remove redundant initialization of variable retval	2021-06-20 22:29:50 +02:00
rtc-vr41xx.c	…
rtc-vt8500.c	…
rtc-wilco-ec.c	…
rtc-wm831x.c	…
rtc-wm8350.c	rtc: wm8350: Handle error for wm8350_register_irq	2022-04-13 20:58:59 +02:00
rtc-x1205.c	…
rtc-xgene.c	…
rtc-zynqmp.c	…
sysfs.c	rtc: sysfs: Correct kerneldoc function name hctosys_show()	2021-06-20 22:18:05 +02:00