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7ad295d519
linux/drivers/rtc
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Jinke Fan 7ad295d519 rtc: Fix the AltCentury value on AMD/Hygon platform 
When using following operations:
date -s "21190910 19:20:00"
hwclock -w
to change date from 2019 to 2119 for test, it will fail on Hygon
Dhyana and AMD Zen CPUs, while the same operations run ok on Intel i7
platform.

MC146818 driver use function mc146818_set_time() to set register
RTC_FREQ_SELECT(RTC_REG_A)'s bit4-bit6 field which means divider stage
reset value on Intel platform to 0x7.

While AMD/Hygon RTC_REG_A(0Ah)'s bit4 is defined as DV0 [Reference]:
DV0 = 0 selects Bank 0, DV0 = 1 selects Bank 1. Bit5-bit6 is defined
as reserved.

DV0 is set to 1, it will select Bank 1, which will disable AltCentury
register(0x32) access. As UEFI pass acpi_gbl_FADT.century 0x32
(AltCentury), the CMOS write will be failed on code:
CMOS_WRITE(century, acpi_gbl_FADT.century).

Correct RTC_REG_A bank select bit(DV0) to 0 on AMD/Hygon CPUs, it will
enable AltCentury(0x32) register writing and finally setup century as
expected.

Test results on Intel i7, AMD EPYC(17h) and Hygon machine show that it
works as expected.
Compiling for sparc64 and alpha architectures are passed.

Reference:
https://www.amd.com/system/files/TechDocs/51192_Bolton_FCH_RRG.pdf
section: 3.13 Real Time Clock (RTC)

Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Jinke Fan <fanjinke@hygon.cn>
Link: https://lore.kernel.org/r/20191105083943.115320-1-fanjinke@hygon.cn
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2019-11-08 16:56:28 +01:00
..
class.c rtc: class: add debug message when registration fails 2019-08-20 21:44:45 +02:00
dev.c rtc: core: correct trivial checkpatch warnings 2019-04-04 10:07:08 +02:00
hctosys.c rtc: core: correct trivial checkpatch warnings 2019-04-04 10:07:08 +02:00
interface.c rtc: disallow update interrupts when time is invalid 2019-11-08 16:14:09 +01:00
Kconfig rtc: meson-vrtc: move config option to proper location 2019-10-16 10:39:00 +02:00
lib.c rtc: lib: check whether tm->tm_year in int32 range 2019-04-06 15:05:31 +02:00
Makefile rtc: fsl-ftm-alarm: add FTM alarm driver 2019-08-23 16:20:50 +02:00
nvmem.c rtc: core: correct trivial checkpatch warnings 2019-04-04 10:07:08 +02:00
proc.c rtc: core: correct trivial checkpatch warnings 2019-04-04 10:07:08 +02:00
rtc-88pm80x.c rtc: remove superfluous error message 2019-08-21 09:57:23 +02:00
rtc-88pm860x.c rtc: Remove dev_err() usage after platform_get_irq() 2019-08-13 10:53:10 +02:00
rtc-ab3100.c rtc: ab3100: convert to SPDX identifier 2019-04-11 16:42:55 +02:00
rtc-ab8500.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 194 2019-05-30 11:29:22 -07:00
rtc-ab-b5ze-s3.c rtc: ab-b5ze-s3: remove .remove 2019-11-08 16:14:09 +01:00
rtc-ab-eoz9.c rtc: remove superfluous error message 2019-08-21 09:57:23 +02:00
rtc-abx80x.c rtc: abx80x: remove useless .remove 2019-03-18 03:36:01 +01:00
rtc-ac100.c rtc: remove superfluous error message 2019-08-21 09:57:23 +02:00
rtc-armada38x.c rtc: armada38x: Use of_device_get_match_data() 2019-10-07 15:49:20 +02:00
rtc-as3722.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
rtc-asm9260.c rtc: use devm_platform_ioremap_resource() to simplify code 2019-10-07 01:07:35 +02:00
rtc-aspeed.c rtc: use devm_platform_ioremap_resource() to simplify code 2019-10-07 01:07:35 +02:00
rtc-at91rm9200.c rtc: at91rm9200: use of_device_get_match_data() 2019-10-03 21:50:47 +02:00
rtc-at91rm9200.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
rtc-at91sam9.c rtc: use devm_platform_ioremap_resource() to simplify code 2019-10-07 01:07:35 +02:00
rtc-au1xxx.c
rtc-bd70528.c rtc: bd70528: fix module alias to autoload module 2019-11-08 16:56:28 +01:00
rtc-bq32k.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
rtc-bq4802.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
rtc-brcmstb-waketimer.c rtc: brcmstb-waketimer: add missed clk_disable_unprepare 2019-11-08 16:14:09 +01:00
rtc-cadence.c rtc: use devm_platform_ioremap_resource() to simplify code 2019-10-07 01:07:35 +02:00
rtc-cmos.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
rtc-coh901331.c rtc: use devm_platform_ioremap_resource() to simplify code 2019-10-07 01:07:35 +02:00
rtc-core.h rtc: move rtc_add_group/s definitions 2018-09-28 14:20:59 +02:00
rtc-cpcap.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174 2019-05-30 11:26:41 -07:00
rtc-cros-ec.c rtc: cros-ec: let the core handle rtc range 2019-11-08 16:14:09 +01:00
rtc-da9052.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
rtc-da9055.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
rtc-da9063.c rtc: da9063: Handle invalid IRQ from platform_get_irq_byname() 2019-10-07 15:49:18 +02:00
rtc-davinci.c rtc: use devm_platform_ioremap_resource() to simplify code 2019-10-07 01:07:35 +02:00
rtc-digicolor.c rtc: use devm_platform_ioremap_resource() to simplify code 2019-10-07 01:07:35 +02:00
rtc-dm355evm.c rtc: dm355evm: convert to SPDX identifier 2019-04-04 10:07:09 +02:00
rtc-ds1216.c rtc: use devm_platform_ioremap_resource() to simplify code 2019-10-07 01:07:35 +02:00
rtc-ds1286.c rtc: use devm_platform_ioremap_resource() to simplify code 2019-10-07 01:07:35 +02:00
rtc-ds1302.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 377 2019-06-05 17:37:10 +02:00
rtc-ds1305.c rtc: remove superfluous error message 2019-08-21 09:57:23 +02:00
rtc-ds1307.c RTC for 5.3 2019-07-17 10:03:50 -07:00
rtc-ds1343.c rtc: ds1343: cleanup .remove 2019-10-19 22:56:11 +02:00
rtc-ds1347.c rtc: ds1347: handle century register 2019-10-07 15:49:38 +02:00
rtc-ds1374.c docs: i2c: convert to ReST and add to driver-api bookset 2019-07-31 13:25:27 -06:00
rtc-ds1390.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
rtc-ds1511.c rtc: use devm_platform_ioremap_resource() to simplify code 2019-10-07 01:07:35 +02:00
rtc-ds1553.c rtc: use devm_platform_ioremap_resource() to simplify code 2019-10-07 01:07:35 +02:00
rtc-ds1672.c rtc: ds1672: remove unnecessary check 2019-08-21 09:57:23 +02:00
rtc-ds1685.c rtc: ds1685: add indirect access method and remove plat_read/plat_write 2019-10-16 10:39:00 +02:00
rtc-ds1742.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
rtc-ds2404.c rtc: ds2404: use hw endiannes variable 2019-05-23 17:42:25 +02:00
rtc-ds3232.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
rtc-efi-platform.c
rtc-efi.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
rtc-em3027.c rtc: em3027: correct month value 2019-11-08 16:14:09 +01:00
rtc-ep93xx.c rtc: use devm_platform_ioremap_resource() to simplify code 2019-10-07 01:07:35 +02:00
rtc-fm3130.c RTC for 5.3 2019-07-17 10:03:50 -07:00
rtc-fsl-ftm-alarm.c rtc: fsl-ftm-alarm: avoid struct rtc_time conversions 2019-11-08 16:14:09 +01:00
rtc-ftrtc010.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
rtc-generic.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
rtc-goldfish.c rtc: Use devm_platform_ioremap_resource() 2019-10-06 21:04:51 +02:00
rtc-hid-sensor-time.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 335 2019-06-05 17:37:06 +02:00
rtc-hym8563.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
rtc-imx-sc.c rtc: remove superfluous error message 2019-08-21 09:57:23 +02:00
rtc-imxdi.c rtc: imxdi: use devm_platform_ioremap_resource() to simplify code 2019-07-22 22:16:14 +02:00
rtc-isl1208.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
rtc-isl12022.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
rtc-isl12026.c rtc: isl12026: convert to i2c_new_dummy_device 2019-07-22 22:30:19 +02:00
rtc-jz4740.c rtc: use devm_platform_ioremap_resource() to simplify code 2019-10-07 01:07:35 +02:00
rtc-lp8788.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
rtc-lpc24xx.c rtc: use devm_platform_ioremap_resource() to simplify code 2019-10-07 01:07:35 +02:00
rtc-lpc32xx.c rtc: lpc32xx: remove .remove 2019-11-08 16:14:09 +01:00
rtc-ls1x.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
rtc-m41t80.c rtc: m41t80: set range 2019-10-07 15:49:16 +02:00
rtc-m41t93.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
rtc-m41t94.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
rtc-m48t35.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
rtc-m48t59.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
rtc-m48t86.c rtc: Use devm_platform_ioremap_resource() 2019-10-06 21:04:51 +02:00
rtc-max6900.c
rtc-max6902.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
rtc-max6916.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
rtc-max8907.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
rtc-max8925.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
rtc-max8997.c rtc: max8997: Fix the returned value in case of error in 'max8997_rtc_read_alarm()' 2018-11-22 18:11:35 +01:00
rtc-max8998.c rtc: maxim: Add SPDX license identifiers 2018-08-14 23:38:45 +02:00
rtc-max77686.c rtc: max77686: convert to devm_i2c_new_dummy_device() 2019-09-01 09:18:35 +02:00
rtc-mc13xxx.c rtc: mc13xxx: fix style issue 2019-04-16 18:06:54 +02:00
rtc-mc146818-lib.c rtc: Fix the AltCentury value on AMD/Hygon platform 2019-11-08 16:56:28 +01:00
rtc-mcp795.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
rtc-meson-vrtc.c rtc: meson: mark PM functions as __maybe_unused 2019-09-10 16:14:15 +02:00
rtc-meson.c rtc: use devm_platform_ioremap_resource() to simplify code 2019-10-07 01:07:35 +02:00
rtc-moxart.c
rtc-mpc5121.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
rtc-mrst.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 441 2019-06-05 17:37:17 +02:00
rtc-msm6242.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
rtc-mt6397.c rtc: remove superfluous error message 2019-08-21 09:57:23 +02:00
rtc-mt7622.c rtc: use devm_platform_ioremap_resource() to simplify code 2019-10-07 01:07:35 +02:00
rtc-mv.c rtc: use devm_platform_ioremap_resource() to simplify code 2019-10-07 01:07:35 +02:00
rtc-mxc_v2.c rtc: mxc_v2: use devm_platform_ioremap_resource() to simplify code 2019-07-22 22:16:12 +02:00
rtc-mxc.c rtc: mxc: use spin_lock_irqsave instead of spin_lock_irq in IRQ context 2019-08-12 23:04:25 +02:00
rtc-omap.c rtc: use devm_platform_ioremap_resource() to simplify code 2019-10-07 01:07:35 +02:00
rtc-opal.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 114 2019-05-24 17:39:01 +02:00
rtc-palmas.c
rtc-pcap.c rtc: pcap: convert to SPDX identifier 2019-05-08 22:14:36 +02:00
rtc-pcf2123.c rtc: pcf2123: add proper compatible string 2019-08-20 21:42:19 +02:00
rtc-pcf2127.c rtc: pcf2127: handle boot-enabled watchdog feature 2019-10-21 10:24:18 +02:00
rtc-pcf8523.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
rtc-pcf8563.c rtc: pcf8563: let the core handle range offsetting 2019-09-01 10:57:47 +02:00
rtc-pcf8583.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
rtc-pcf50633.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
rtc-pcf85063.c rtc: pcf85063: add RTC_VL_READ/RTC_VL_CLR support 2019-04-04 10:07:11 +02:00
rtc-pcf85363.c rtc: pcf85363/pcf85263: fix regmap error in set_time 2019-09-01 08:48:28 +02:00
rtc-pic32.c rtc: use devm_platform_ioremap_resource() to simplify code 2019-10-07 01:07:35 +02:00
rtc-pl030.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
rtc-pl031.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
rtc-pm8xxx.c rtc: Remove dev_err() usage after platform_get_irq() 2019-08-13 10:53:10 +02:00
rtc-ps3.c rtc: ps3: set range 2019-04-04 10:07:10 +02:00
rtc-puv3.c rtc: remove superfluous error message 2019-08-21 09:57:23 +02:00
rtc-pxa.c rtc: Remove dev_err() usage after platform_get_irq() 2019-08-13 10:53:10 +02:00
rtc-r7301.c rtc: Use devm_platform_ioremap_resource() 2019-10-06 21:04:51 +02:00
rtc-r9701.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
rtc-rc5t583.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201 2019-05-30 11:29:52 -07:00
rtc-rk808.c rtc: Remove dev_err() usage after platform_get_irq() 2019-08-13 10:53:10 +02:00
rtc-rp5c01.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
rtc-rs5c313.c
rtc-rs5c348.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
rtc-rs5c372.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
rtc-rtd119x.c rtc: use devm_platform_ioremap_resource() to simplify code 2019-10-07 01:07:35 +02:00
rtc-rv3028.c rtc: rv3028: add clkout support 2019-10-19 23:16:57 +02:00
rtc-rv3029c2.c rtc: rv3029: revert error handling patch to rv3029_eeprom_write() 2019-08-21 09:57:23 +02:00
rtc-rv8803.c rtc: remove superfluous error message 2019-08-21 09:57:23 +02:00
rtc-rx4581.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
rtc-rx6110.c rtc: rx6110: declare missing of table 2019-04-29 15:53:42 +02:00
rtc-rx8010.c RTC for 5.3 2019-07-17 10:03:50 -07:00
rtc-rx8025.c RTC for 5.3 2019-07-17 10:03:50 -07:00
rtc-rx8581.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
rtc-s3c.c rtc: use devm_platform_ioremap_resource() to simplify code 2019-10-07 01:07:35 +02:00
rtc-s3c.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
rtc-s5m.c rtc: s5m: convert to i2c_new_dummy_device 2019-07-23 20:34:31 +02:00
rtc-s35390a.c rtc: s35390a: set range 2019-10-19 22:33:05 +02:00
rtc-sa1100.c rtc: use devm_platform_ioremap_resource() to simplify code 2019-10-07 01:07:35 +02:00
rtc-sa1100.h
rtc-sc27xx.c rtc: sc27xx: remove .remove 2019-11-08 16:14:09 +01:00
rtc-sd3078.c rtc: remove superfluous error message 2019-08-21 09:57:23 +02:00
rtc-sh.c RTC for 5.2 2019-05-09 14:46:33 -07:00
rtc-sirfsoc.c rtc: sirfsoc: remove .remove 2019-11-08 16:14:09 +01:00
rtc-snvs.c rtc: snvs: switch to rtc_time64_to_tm/rtc_tm_to_time64 2019-09-01 08:48:23 +02:00
rtc-spear.c rtc: use devm_platform_ioremap_resource() to simplify code 2019-10-07 01:07:35 +02:00
rtc-st-lpc.c rtc: use devm_platform_ioremap_resource() to simplify code 2019-10-07 01:07:35 +02:00
rtc-starfire.c
rtc-stk17ta8.c rtc: use devm_platform_ioremap_resource() to simplify code 2019-10-07 01:07:35 +02:00
rtc-stm32.c rtc: use devm_platform_ioremap_resource() to simplify code 2019-10-07 01:07:35 +02:00
rtc-stmp3xxx.c rtc: stmp3xxx: convert to SPDX identifier 2019-04-11 16:42:55 +02:00
rtc-sun4v.c rtc: sun4v: switch to SPDX identifier 2019-04-04 10:07:10 +02:00
rtc-sun6i.c RTC for 5.4 2019-09-22 11:05:43 -07:00
rtc-sunxi.c rtc: use devm_platform_ioremap_resource() to simplify code 2019-10-07 01:07:35 +02:00
rtc-tegra.c rtc: use devm_platform_ioremap_resource() to simplify code 2019-10-07 01:07:35 +02:00
rtc-test.c rtc: test: enable wakeup flags 2019-05-23 17:44:52 +02:00
rtc-tps6586x.c rtc: remove superfluous error message 2019-08-21 09:57:23 +02:00
rtc-tps65910.c rtc: remove superfluous error message 2019-08-21 09:57:23 +02:00
rtc-tps80031.c
rtc-twl.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
rtc-tx4939.c rtc: use devm_platform_ioremap_resource() to simplify code 2019-10-07 01:07:35 +02:00
rtc-v3020.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
rtc-vr41xx.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
rtc-vt8500.c rtc: vt8500: let the core handle rtc range 2019-10-19 22:33:15 +02:00
rtc-wilco-ec.c rtc: wilco-ec: Handle reading invalid times 2019-10-14 17:49:17 +02:00
rtc-wm831x.c rtc: wm831x: Add IRQF_ONESHOT flag 2019-07-13 21:39:51 +02:00
rtc-wm8350.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
rtc-x1205.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
rtc-xgene.c rtc: use devm_platform_ioremap_resource() to simplify code 2019-10-07 01:07:35 +02:00
rtc-zynqmp.c rtc: xilinx: Fix calibval variable type 2019-10-14 17:49:19 +02:00
sysfs.c rtc: core: correct trivial checkpatch warnings 2019-04-04 10:07:08 +02:00
systohc.c rtc: drop set_mms and set_mmss64 2019-05-08 22:14:36 +02:00