Message ID | 20240611072411.671600-1-csokas.bence@prolan.hu |
---|---|
State | Accepted |
Headers | show |
Series | [v2,1/2] rtc: ds1307: Detect oscillator fail on mcp794xx | expand |
On Tue, 11 Jun 2024 09:24:08 +0200, Csókás, Bence wrote: > This patch enables the detection of the oscillator failure on mcp794xx chips. > > Co-developed-by: > Signed-off-by: > Signed-off-by: > Applied, thanks! [1/2] rtc: ds1307: Detect oscillator fail on mcp794xx https://git.kernel.org/abelloni/c/5ea60ba8007d [2/2] rtc: ds1307: Clamp year to valid BCD (0-99) in `set_time()` https://git.kernel.org/abelloni/c/f825a15fc8ce Best regards,
diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c index 506b7d1c2397..bdb7b201a160 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];