Hello,
DryIce , SRTC not working on imx53. ( kernel 4.x) ( same hardware running older kernel versions.. means , rtc is working)
During boot all seems to be fine but once you try to read or write the hardware clock later on … it bails out with this error on the console.
hwclock
[ 97.186577] imxdi_rtc 53fa4000.rtc: Write-wait timeout val = 0x5a2ff8d3 reg = 0x00000008
Hwclock : select() to /dev/rtc0 to wait for clock tick timed out: No such file or directory
I've Added some driver – printk’s….
# hwclock
[ 73.362559] dryice_rtc_read_time ------------------------------------------------
[ 73.395077] dryice_rtc_read_time ------------------------------------------------
[ 73.414156] dryice_rtc_read_time ------------------------------------------------
[ 73.421700] di_write_wait ------------------------------------------------
[ 73.472624] di_int_enable ------------------------------------------------
[ 73.514609] imxdi_rtc 53fa4000.srtc: Write-wait timeout val = 0x5a3000c8 reg = 0x00000008
[ 73.523019] di_int_enable ------------------------------------------------
<< STALLS for 5 seconds here >>
<< STALLS for 5 seconds here >>
<< STALLS for 5 seconds here >>
<< STALLS for 5 seconds here >>
<< STALLS for 5 seconds here >>
hwclock[ 78.584909] dryice_rtc_alarm_irq_enable ------------------------------------------------
: select() to /dev/rtc0 to wait f[ 78.593456] di_int_disable ------------------------------------------------
or clock tick timed out: No such file or directory
Strace .. logging ================================
stat("/lib/ld-uClibc.so.0", {st_mode=S_IFREG|0777, st_size=25300, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|0x4000000, -1, 0) = 0xb6f04000
set_tls(0xb6f04490, 0xb6f04b38, 0xb6f07088, 0xb6f04490, 0xb6f06f74) = 0
mprotect(0xb6ed2000, 4096, PROT_READ) = 0
mprotect(0xb6f06000, 4096, PROT_READ) = 0
ioctl(0, SNDCTL_TMR_TIMEBASE or TCGETS, {B115200 opost isig icanon echo ...}) = 0
ioctl(1, SNDCTL_TMR_TIMEBASE or TCGETS, {B115200 opost isig icanon echo ...}) = 0
gettimeofday({1513095430, 708097}, NULL) = 0
getuid32() = 0
open("/dev/rtc", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
open("/dev/rtc0", O_RDONLY|O_LARGEFILE) = 3
brk(0) = 0x18000
brk(0x19000) = 0x19000
stat64("/etc/adjtime", 0xbeec26a8) = -1 ENOENT (No such file or directory)
ioctl(3, PHN_SET_REGS or RTC_UIE_ON, 0) = 0
select(4, [3], NULL, NULL, {5, 0}
<< STALLS for 5 seconds here -- select is not returning !!! timeout is 5 seconds…. >>
) = 0 (Timeout)[ 141.766162] dryice_rtc_alarm_irq_enable ------------------------------------------------
write(2, "hwclock", 7hwclock) = 7
write(2, ": ", 2: ) =[ 141.782195] di_int_disable ------------------------------------------------
2
write(2, "select() to ", 12select() to ) = 12
write(2, "/dev/rtc0", 9/dev/rtc0) = 9
write(2, " to wait for clock tick timed ou"..., 33 to wait for clock tick timed out) = 33
write(2, ": ", 2: ) = 2
write(2, "No such file or directory", 25No such file or directory) = 25
write(2, "\n", 1
) = 1
ioctl(3, PHN_NOT_OH or RTC_UIE_OFF, 0) = 0
close(3) = 0
exit_group(74) = ?
QUICK analyses ( could be wrong) ?
It seems that hwclock is reading the current-timestamp 3 times and if not changed in those 3 read cycles… it sets up an read-interrupt-abort able time reader that should return as soon as the irq fires… but this seems to be missing !
FYI: I’ve been using following commint to enable srtc.
commit 5b725054147deaf966b3919e10a86c6bfe946a18
Author: Patrick Bruenn <p.bruenn@xxxxxxxxxxxx>
Date: Wed Jul 26 14:05:32 2017 +0200
ARM: dts: imx53: add srtc node
The i.MX53 has an integrated secure real time clock. Add it to the dtsi.
Signed-off-by: Patrick Bruenn <p.bruenn@xxxxxxxxxxxx>
Signed-off-by: Shawn Guo <shawnguo@xxxxxxxxxx>
diff --git a/arch/arm/boot/dts/imx53.dtsi b/arch/arm/boot/dts/imx53.dtsi
index 2e516f4..8bf0d89 100644
--- a/arch/arm/boot/dts/imx53.dtsi
+++ b/arch/arm/boot/dts/imx53.dtsi
@@ -433,6 +433,15 @@
clock-names = "ipg", "per";
};
+ srtc: srtc@53fa4000 {
+ compatible = "fsl,imx53-rtc", "fsl,imx25-rtc";
+ reg = <0x53fa4000 0x4000>;
+ interrupts = <24>;
+ interrupt-parent = <&tzic>;
+ clocks = <&clks IMX5_CLK_SRTC_GATE>;
+ clock-names = "ipg";
+ };
+
Best Regards
Noel
