Subject: + rtc-s5m-use-shorter-time-of-register-update.patch added to -mm tree To: k.kozlowski@xxxxxxxxxxx,a.zummo@xxxxxxxxxxxx,b.zolnierkie@xxxxxxxxxxx,kyungmin.park@xxxxxxxxxxx,lee.jones@xxxxxxxxxx,m.szyprowski@xxxxxxxxxxx,sameo@xxxxxxxxxxxxxxx,sbkim73@xxxxxxxxxxx From: akpm@xxxxxxxxxxxxxxxxxxxx Date: Mon, 21 Apr 2014 15:21:35 -0700 The patch titled Subject: rtc: s5m: use shorter time of register update has been added to the -mm tree. Its filename is rtc-s5m-use-shorter-time-of-register-update.patch This patch should soon appear at http://ozlabs.org/~akpm/mmots/broken-out/rtc-s5m-use-shorter-time-of-register-update.patch and later at http://ozlabs.org/~akpm/mmotm/broken-out/rtc-s5m-use-shorter-time-of-register-update.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx> Subject: rtc: s5m: use shorter time of register update Set the time needed for updating alarm and time registers to 0.45 ms. The default is 7.32 ms which is too long and leads to warnings when setting alarm or time: s5m-rtc: waiting for UDR update, reached max number of retries Signed-off-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx> Cc: Kyungmin Park <kyungmin.park@xxxxxxxxxxx> Cc: Lee Jones <lee.jones@xxxxxxxxxx> Cc: Alessandro Zummo <a.zummo@xxxxxxxxxxxx> Cc: Sangbeom Kim <sbkim73@xxxxxxxxxxx> Cc: Samuel Ortiz <sameo@xxxxxxxxxxxxxxx> Cc: Kyungmin Park <kyungmin.park@xxxxxxxxxxx> Cc: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- drivers/rtc/rtc-s5m.c | 7 +++++++ include/linux/mfd/samsung/rtc.h | 10 ++++++++++ 2 files changed, 17 insertions(+) diff -puN drivers/rtc/rtc-s5m.c~rtc-s5m-use-shorter-time-of-register-update drivers/rtc/rtc-s5m.c --- a/drivers/rtc/rtc-s5m.c~rtc-s5m-use-shorter-time-of-register-update +++ a/drivers/rtc/rtc-s5m.c @@ -519,6 +519,13 @@ static int s5m8767_rtc_init_reg(struct s u8 data[2]; int ret; + /* UDR update time. Default of 7.32 ms is too long. */ + ret = regmap_update_bits(info->regmap, S5M_RTC_UDR_CON, + S5M_RTC_UDR_T_MASK, S5M_RTC_UDR_T_450_US); + if (ret < 0) + dev_err(info->dev, "%s: fail to change UDR time: %d\n", + __func__, ret); + /* Set RTC control register : Binary mode, 24hour mode */ data[0] = (1 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT); data[1] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT); diff -puN include/linux/mfd/samsung/rtc.h~rtc-s5m-use-shorter-time-of-register-update include/linux/mfd/samsung/rtc.h --- a/include/linux/mfd/samsung/rtc.h~rtc-s5m-use-shorter-time-of-register-update +++ a/include/linux/mfd/samsung/rtc.h @@ -111,6 +111,16 @@ enum s2mps_rtc_reg { #define RTC_TCON_MASK (1 << RTC_TCON_SHIFT) #define S5M_RTC_TIME_EN_SHIFT 3 #define S5M_RTC_TIME_EN_MASK (1 << S5M_RTC_TIME_EN_SHIFT) +/* + * UDR_T field in S5M_RTC_UDR_CON register determines the time needed + * for updating alarm and time registers. Default is 7.32 ms. + */ +#define S5M_RTC_UDR_T_SHIFT 6 +#define S5M_RTC_UDR_T_MASK (0x3 << S5M_RTC_UDR_T_SHIFT) +#define S5M_RTC_UDR_T_7320_US (0x0 << S5M_RTC_UDR_T_SHIFT) +#define S5M_RTC_UDR_T_1830_US (0x1 << S5M_RTC_UDR_T_SHIFT) +#define S5M_RTC_UDR_T_3660_US (0x2 << S5M_RTC_UDR_T_SHIFT) +#define S5M_RTC_UDR_T_450_US (0x3 << S5M_RTC_UDR_T_SHIFT) /* RTC Hour register */ #define HOUR_PM_SHIFT 6 _ Patches currently in -mm which might be from k.kozlowski@xxxxxxxxxxx are linux-next.patch mfd-rtc-s5m-do-not-allocate-rtc-i2c-dummy-and-regmap-for-unsupported-chipsets.patch mfd-rtc-sec-s5m-rename-sec-symbols-to-s5m.patch rtc-s5m-remove-undocumented-time-init-on-first-boot.patch rtc-s5m-use-shorter-time-of-register-update.patch rtc-s5m-support-different-register-layout.patch rtc-s5m-add-support-for-s2mps14-rtc.patch rtc-s5m-consolidate-two-device-type-switch-statements.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html