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rtc: pcf2127: improve timestamp reading performance

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Reading the 7 timetamp registers currently involves reading 25 registers
solely to be able to print the content of the three control registers,
in addition to the 7 timestamp registers. This print never occurs,
unless the user enables dynamic debug in this driver or set
CONFIG_RTC_DEBUG.

Reading the timestamp registers should consist of reading 7
consecutive timestamp registers.

This patch optimize the performance of reading the timestamp registers
by reading 7 consecutive registers instead of 25, and dropping the
print of the control registers.

Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
Link: https://lore.kernel.org/r/20230622145800.2442116-3-hugo@hugovil.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Hugo Villeneuve 2023-06-22 10:57:45 -04:00 committed by Alexandre Belloni
parent 31f077c374
commit 720fb4b83b
1 changed files with 10 additions and 20 deletions
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30
drivers/rtc/rtc-pcf2127.c
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@ -66,12 +66,6 @@
#define PCF2127_REG_TS_CTRL 0x12
#define PCF2127_BIT_TS_CTRL_TSOFF BIT(6)
#define PCF2127_BIT_TS_CTRL_TSM BIT(7)
#define PCF2127_REG_TS_SC 0x13
#define PCF2127_REG_TS_MN 0x14
#define PCF2127_REG_TS_HR 0x15
#define PCF2127_REG_TS_DM 0x16
#define PCF2127_REG_TS_MO 0x17
#define PCF2127_REG_TS_YR 0x18
/*
* RAM registers
* PCF2127 has 512 bytes general-purpose static RAM (SRAM) that is
@ -440,9 +434,9 @@ static int pcf2127_rtc_ts_read(struct device *dev, time64_t *ts)
struct pcf2127 *pcf2127 = dev_get_drvdata(dev);
struct rtc_time tm;
int ret;
unsigned char data[25];
unsigned char data[7];
ret = regmap_bulk_read(pcf2127->regmap, PCF2127_REG_CTRL1, data,
ret = regmap_bulk_read(pcf2127->regmap, PCF2127_REG_TS_CTRL, data,
sizeof(data));
if (ret) {
dev_err(dev, "%s: read error ret=%d\n", __func__, ret);
@ -450,20 +444,16 @@ static int pcf2127_rtc_ts_read(struct device *dev, time64_t *ts)
}
dev_dbg(dev,
"%s: raw data is cr1=%02x, cr2=%02x, cr3=%02x, ts_sc=%02x, ts_mn=%02x, ts_hr=%02x, ts_dm=%02x, ts_mo=%02x, ts_yr=%02x\n",
__func__, data[PCF2127_REG_CTRL1], data[PCF2127_REG_CTRL2],
data[PCF2127_REG_CTRL3], data[PCF2127_REG_TS_SC],
data[PCF2127_REG_TS_MN], data[PCF2127_REG_TS_HR],
data[PCF2127_REG_TS_DM], data[PCF2127_REG_TS_MO],
data[PCF2127_REG_TS_YR]);
"%s: raw data is ts_sc=%02x, ts_mn=%02x, ts_hr=%02x, ts_dm=%02x, ts_mo=%02x, ts_yr=%02x\n",
__func__, data[1], data[2], data[3], data[4], data[5], data[6]);
tm.tm_sec = bcd2bin(data[PCF2127_REG_TS_SC] & 0x7F);
tm.tm_min = bcd2bin(data[PCF2127_REG_TS_MN] & 0x7F);
tm.tm_hour = bcd2bin(data[PCF2127_REG_TS_HR] & 0x3F);
tm.tm_mday = bcd2bin(data[PCF2127_REG_TS_DM] & 0x3F);
tm.tm_sec = bcd2bin(data[1] & 0x7F);
tm.tm_min = bcd2bin(data[2] & 0x7F);
tm.tm_hour = bcd2bin(data[3] & 0x3F);
tm.tm_mday = bcd2bin(data[4] & 0x3F);
/* TS_MO register (month) value range: 1-12 */
tm.tm_mon = bcd2bin(data[PCF2127_REG_TS_MO] & 0x1F) - 1;
tm.tm_year = bcd2bin(data[PCF2127_REG_TS_YR]);
tm.tm_mon = bcd2bin(data[5] & 0x1F) - 1;
tm.tm_year = bcd2bin(data[6]);
if (tm.tm_year < 70)
tm.tm_year += 100; /* assume we are in 1970...2069 */