From 35a34f09baed51216455740e01bd132cf60c71cf Mon Sep 17 00:00:00 2001 From: =?utf8?q?Cs=C3=B3k=C3=A1s=2C=20Bence?= Date: Tue, 11 Jun 2024 09:24:08 +0200 Subject: [PATCH] rtc: ds1307: Detect oscillator fail on mcp794xx MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit This patch enables the detection of the oscillator failure on mcp794xx chips. Co-developed-by: Szentendrei, Tamás Signed-off-by: Szentendrei, Tamás Signed-off-by: Csókás, Bence Link: https://lore.kernel.org/r/20240611072411.671600-1-csokas.bence@prolan.hu Signed-off-by: Alexandre Belloni --- drivers/rtc/rtc-ds1307.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c index 506b7d1c23970..bdb7b201a1605 100644 --- a/drivers/rtc/rtc-ds1307.c +++ b/drivers/rtc/rtc-ds1307.c @@ -65,6 +65,7 @@ enum ds_type { # define DS1340_BIT_CENTURY_EN 0x80 /* in REG_HOUR */ # define DS1340_BIT_CENTURY 0x40 /* in REG_HOUR */ #define DS1307_REG_WDAY 0x03 /* 01-07 */ +# define MCP794XX_BIT_OSCRUN BIT(5) # define MCP794XX_BIT_VBATEN 0x08 #define DS1307_REG_MDAY 0x04 /* 01-31 */ #define DS1307_REG_MONTH 0x05 /* 01-12 */ @@ -242,6 +243,10 @@ static int ds1307_get_time(struct device *dev, struct rtc_time *t) regs[DS1307_REG_MIN] & M41T0_BIT_OF) { dev_warn_once(dev, "oscillator failed, set time!\n"); return -EINVAL; + } else if (ds1307->type == mcp794xx && + !(regs[DS1307_REG_WDAY] & MCP794XX_BIT_OSCRUN)) { + dev_warn_once(dev, "oscillator failed, set time!\n"); + return -EINVAL; } tmp = regs[DS1307_REG_SECS]; -- 2.39.5