| Message ID | D24E577EA1E37B4788A3BFBC418F14A70760C04A@wetsrvex01.loepfe.com |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | DryIce , RTC not working on imx53. | expand |
>From: Vellemans, Noel [mailto:Noel.Vellemans@visionBMS.com] >Sent: Donnerstag, 5. Oktober 2017 16:19 >Hello, > Hi, not sure if I can help on this, but as I did some testing myself I thought I should throw in my results as well. >DryIce , SRTC not working on imx53. ( kernel 4.x) ( same hardware running >older kernel versions.. means , rtc is working) > Is it only the kernel you are changing? I am asking because I had the impression that hwclock behaves different on Debian stretch (util-linux 2.29.2) and jessie (util-linux 2.25.2). I am saying impression because it seemed on jessie I would always get a response of hwclock, but on stretch never. When I did more systematic testing it looks like right after boot hwclock -r will always fail. But if I wait some minutes, all calls succeed. >... >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 ! > I am seeing a lot of interrupts with kernel 4.14-rc4 (jessie and stretch), but they seem to be unhandled: root@CX9020:~# uname -a Linux CX9020 4.14.0-rc4+ #151 PREEMPT Wed Oct 11 10:40:34 CEST 2017 armv7l GNU/Linux root@CX9020:~# hwclock -D -r hwclock from util-linux 2.29.2 Using the /dev interface to the clock. Last drift adjustment done at 1490885082 seconds after 1969 Last calibration done at 1490885082 seconds after 1969 Hardware clock is on UTC time Assuming hardware clock is kept in UTC time. Waiting for clock tick... [ 26.795437] irq 40: nobody cared (try booting with the "irqpoll" option) [ 26.802696] handlers: [ 26.805031] [<c06029e8>] dryice_irq [ 26.808584] Disabling IRQ #40 select() to /dev/rtc to wait for clock tick timed out...synchronization failed root@CX9020:~# cat /proc/interrupts CPU0 17: 4276 tzic 1 Edge mmc0 18: 52 tzic 2 Edge mmc1 22: 0 tzic 6 Edge sdma 30: 176 tzic 14 Edge 53f80200.usb 40: 100000 tzic 24 Edge 53fa4000.srtc 48: 268 tzic 32 Edge 53fc0000.serial 55: 2288 tzic 39 Edge i.MX Timer Tick 74: 0 tzic 58 Edge 53f98000.wdog 79: 278 tzic 63 Edge 63fc4000.i2c 93: 0 tzic 77 Edge arm-pmu 103: 662 tzic 87 Edge 63fec000.ethernet 145: 0 gpio-mxc 1 Edge 50004000.esdhc cd 148: 0 gpio-mxc 4 Edge 50008000.esdhc cd 368: 674 IPU 23 Edge imx_drm 369: 0 IPU 28 Edge imx_drm Err: 0 I added some tracing to dryice_irq() and saw that most of the time (if not all the time) dsr == DSR_MCO /* monotonic clock overflow */ with dier vary between 0x110, 0x10 and even 0x0. I don't know what's the right thing to do, to recover from DSR_MCO. " return IRQ_HANDLED" will stop the nobody cared message but hwclock still times out. And for completeness: root@CX9020:~# dmesg | grep srtc [ 0.299043] imxdi_rtc 53fa4000.srtc: Unlocked unit detected [ 0.299539] imxdi_rtc 53fa4000.srtc: security violation interrupt not available. [ 0.299757] rtc rtc0: 53fa4000.srtc: dev (253:0) [ 0.299778] imxdi_rtc 53fa4000.srtc: rtc core: registered 53fa4000.srtc as rtc0 [ 0.436785] imxdi_rtc 53fa4000.srtc: setting system clock to 2017-10-12 06:38:08 UTC (1507790288) [ 445.486624] imxdi_rtc 53fa4000.srtc: Write-wait timeout val = 0x59df0f8e reg = 0x00000008 [ 3025.076612] imxdi_rtc 53fa4000.srtc: Write-wait timeout val = 0x59df19a2 reg = 0x00000008 [ 3082.316612] imxdi_rtc 53fa4000.srtc: Write-wait timeout val = 0x59df19db reg = 0x00000008 Novice question: Is hwclock still required these days? For me it looks like the kernel is synchronizing with rtc on it's own. Maybe some kernel config is incompatible with hwclock? Regards, Patrick Beckhoff Automation GmbH & Co. KG | Managing Director: Dipl. Phys. Hans Beckhoff Registered office: Verl, Germany | Register court: Guetersloh HRA 7075
On Thu, Oct 12, 2017 at 07:50:41AM +0000, Patrick Brünn wrote: > Novice question: Is hwclock still required these days? For me it looks > like the kernel is synchronizing with rtc on it's own. Maybe some kernel > config is incompatible with hwclock? It depends on your application. If you want the kernel's idea of time to be wrong up to a second or two, then you can rely on the kernel's time setting. Please realise that the kernel has always set the time from the RTC, even on x86 where hwclock has been used. hwclock, however, has some advanced features and advantages that are beneficial if you're after accuracy. 1) hwclock will try to read the RTC as close to a second-change as possible, so that the time read from the RTC is as close to the second. 2) hwclock can measure and correct the RTC time for its own drift if hwclock has been allowed to capture and process the offset. What this means is that hwclock has the capability to precisely set the kernel's time at boot, way more accurately than the kernel does. The kernel's time setting is focused on speed, not accuracy. So, if your userspace application is to monitor something using a precise timestamp, and you are NTP synchronising (or other method) the time on the system, then you need the kernel's idea of time to be set much more precisely to avoid NTP making big corrections over the following three to six hours. This happens because NTP will slew the clock for a few seconds of difference, which makes storing and reloading the PPM value useless, and can also mean that in such a monitoring application, the results are unreliable until NTP has re-stabilised. Here's an example of an application where this may matter: average speed camera system. You have two cameras over a section of road, each with their own processing, which are NTP synchronised. Each reads the numberplate of passing vehicles using ANPR technology, and timestamps the passing of the vehicle using their local clock. The distance is known, so it's an easy calculation to calculate the vehicle speed. If the vehicle speed is over the limit, the driver is fined. Consider what the implications are if one of the systems rebooted and then had incorrect time (up to two seconds wrong) for up to six hours after - a two second error is about a 3% error in recorded speed. Would you want to be sent a speeding fine from such a system? (We have the first non-motorway road in Surrey, UK to have average speed cameras installed down its entire length because of "piston heads" who think the speed limit is 60mph rather than the sign- posted 40mph.) Another, probably more relevant application is a stratum-1 NTP server synchronised via PPS to a GPS. I wonder how many people are aware that if you reboot such a setup relying on the kernel's time setting only, the time sent to clients will be wrong while NTP slews the local clock. I've seen these effects locally, where rebooting exactly such a system results in slaved systems which have no other source of time also making big corrections.
On 12/10/2017 at 07:50:41 +0000, Patrick Brünn wrote: > I am seeing a lot of interrupts with kernel 4.14-rc4 (jessie and stretch), but they seem to be unhandled: > root@CX9020:~# uname -a > Linux CX9020 4.14.0-rc4+ #151 PREEMPT Wed Oct 11 10:40:34 CEST 2017 armv7l GNU/Linux > root@CX9020:~# hwclock -D -r > hwclock from util-linux 2.29.2 > Using the /dev interface to the clock. > Last drift adjustment done at 1490885082 seconds after 1969 > Last calibration done at 1490885082 seconds after 1969 > Hardware clock is on UTC time > Assuming hardware clock is kept in UTC time. > Waiting for clock tick... > [ 26.795437] irq 40: nobody cared (try booting with the "irqpoll" option) > [ 26.802696] handlers: > [ 26.805031] [<c06029e8>] dryice_irq > [ 26.808584] Disabling IRQ #40 > select() to /dev/rtc to wait for clock tick timed out...synchronization failed > root@CX9020:~# cat /proc/interrupts > CPU0 > 17: 4276 tzic 1 Edge mmc0 > 18: 52 tzic 2 Edge mmc1 > 22: 0 tzic 6 Edge sdma > 30: 176 tzic 14 Edge 53f80200.usb > 40: 100000 tzic 24 Edge 53fa4000.srtc > 48: 268 tzic 32 Edge 53fc0000.serial > 55: 2288 tzic 39 Edge i.MX Timer Tick > 74: 0 tzic 58 Edge 53f98000.wdog > 79: 278 tzic 63 Edge 63fc4000.i2c > 93: 0 tzic 77 Edge arm-pmu > 103: 662 tzic 87 Edge 63fec000.ethernet > 145: 0 gpio-mxc 1 Edge 50004000.esdhc cd > 148: 0 gpio-mxc 4 Edge 50008000.esdhc cd > 368: 674 IPU 23 Edge imx_drm > 369: 0 IPU 28 Edge imx_drm > Err: 0 > > I added some tracing to dryice_irq() and saw that most of the time (if not all the time) dsr == DSR_MCO /* monotonic clock overflow */ with dier vary between 0x110, 0x10 and even 0x0. > I don't know what's the right thing to do, to recover from DSR_MCO. " return IRQ_HANDLED" will stop the nobody cared message but hwclock still times out. > hwclock times out because the alarm is not working properly. Can you check whether rtctest is working?
>From: Alexandre Belloni [mailto:alexandre.belloni@free-electrons.com] >Sent: Donnerstag, 9. November 2017 04:03 > >hwclock times out because the alarm is not working properly. Can you >check whether rtctest is working? > You mean "tools/testing/selftests/timers/rtctest", right? I just run it and it's stuck at "Counting 5 update (1/sec) interrupts from reading /dev/rtc0:" Kernel log shows a new message for each try I restart rtctest. [ 1032.349562] imxdi_rtc 53fa4000.srtc: Write-wait timeout val = 0x5a042418 reg = 0x00000008" Regards, Patrick Beckhoff Automation GmbH & Co. KG | Managing Director: Dipl. Phys. Hans Beckhoff Registered office: Verl, Germany | Register court: Guetersloh HRA 7075
+Cc Fabio On 09/11/2017 at 09:59:02 +0000, Patrick Brünn wrote: > > >From: Alexandre Belloni [mailto:alexandre.belloni@free-electrons.com] > >Sent: Donnerstag, 9. November 2017 04:03 > > > >hwclock times out because the alarm is not working properly. Can you > >check whether rtctest is working? > > > You mean "tools/testing/selftests/timers/rtctest", right? > > I just run it and it's stuck at "Counting 5 update (1/sec) interrupts from reading /dev/rtc0:" > So alarms or interrupts definitively don't work. > Kernel log shows a new message for each try I restart rtctest. > [ 1032.349562] imxdi_rtc 53fa4000.srtc: Write-wait timeout val = 0x5a042418 reg = 0x00000008" > That would explain it because failing to write DCAMR means that the alarm is not set to the proper value. But that doesn't explain all the spurious interrupts you are seeing. Fabio, is there any recent change in the platform code that would make reading/writing the rtc register fail?
Hi Alexandre, On Mon, Nov 13, 2017 at 2:15 PM, Alexandre Belloni <alexandre.belloni@free-electrons.com> wrote: > Fabio, is there any recent change in the platform code that would make > reading/writing the rtc register fail? I don't recall of any recent change in this area. Patrick/Noel, Does the change below help? --- a/arch/arm/boot/dts/imx53.dtsi +++ b/arch/arm/boot/dts/imx53.dtsi @@ -436,8 +436,7 @@ srtc: srtc@53fa4000 { compatible = "fsl,imx53-rtc", "fsl,imx25-rtc"; reg = <0x53fa4000 0x4000>; - interrupts = <24>; - interrupt-parent = <&tzic>; + interrupts = <24 25>; clocks = <&clks IMX5_CLK_SRTC_GATE>; clock-names = "ipg"; };
On Mon, Nov 13, 2017 at 2:54 PM, Fabio Estevam <festevam@gmail.com> wrote: > I don't recall of any recent change in this area. > > Patrick/Noel, > > Does the change below help? > > --- a/arch/arm/boot/dts/imx53.dtsi > +++ b/arch/arm/boot/dts/imx53.dtsi > @@ -436,8 +436,7 @@ > srtc: srtc@53fa4000 { > compatible = "fsl,imx53-rtc", "fsl,imx25-rtc"; > reg = <0x53fa4000 0x4000>; > - interrupts = <24>; > - interrupt-parent = <&tzic>; > + interrupts = <24 25>; > clocks = <&clks IMX5_CLK_SRTC_GATE>; > clock-names = "ipg"; > }; With this change I no longer get the spurious interrupts: # cat /proc/interrupts | grep rtc 40: 0 tzic 24 Edge 53fa4000.srtc 41: 0 tzic 25 Edge 53fa4000.srtc The timeout is still present though and we need to figure this out.
>From: Fabio Estevam [mailto:festevam@gmail.com] >Sent: Montag, 13. November 2017 19:57 >> I don't recall of any recent change in this area. >> I don't think the behavior changed recently. I tried a kernel 4.4.65 and it shows the same symptoms. I guess Noel really means 3.19-> 4.0. >> Patrick/Noel, >> >> Does the change below help? Unfortunately no. Did you run hwclock or rtctest? I still see: root@CX9020:~# cat /proc/interrupts | grep rtc 40: 0 tzic 24 Edge 53fa4000.srtc 41: 0 tzic 25 Edge 53fa4000.srtc root@CX9020:~# hwclock -D -r hwclock from util-linux 2.29.2 Using the /dev interface to the clock. Last drift adjustment done at 1490885082 seconds after 1969 Last calibration done at 1490885082 seconds after 1969 Hardware clock is on UTC time Assuming hardware clock is kept in UTC time. Waiting for clock tick... [ 41.035269] irq 40: nobody cared (try booting with the "irqpoll" option) [ 41.042514] handlers: [ 41.044847] [<c06031e0>] dryice_irq [ 41.048398] Disabling IRQ #40 select() to /dev/rtc to wait for clock tick timed out...synchronization failed root@CX9020:~# cat /proc/interrupts | grep rtc 40: 100000 tzic 24 Edge 53fa4000.srtc 41: 0 tzic 25 Edge 53fa4000.srtc or if I run rtctest from tools/testing/selftests/timers/ (after reboot): root@CX9020:~# cat /proc/interrupts | grep rtc 40: 0 tzic 24 Edge 53fa4000.srtc 41: 0 tzic 25 Edge 53fa4000.srtc root@CX9020:~# ./rtctest RTC Driver Test Example. Counting 5 update (1/sec) interrupts from reading /dev/rtc0:[ 37.550399] irq 40: nobody cared (try booting with the "irqpoll" option) [ 37.557646] handlers: [ 37.559980] [<c06031e0>] dryice_irq [ 37.563532] Disabling IRQ #40 ^C root@CX9020:~# cat /proc/interrupts | grep rtc 40: 100000 tzic 24 Edge 53fa4000.srtc 41: 0 tzic 25 Edge 53fa4000.srtc With the attached patch I get rid of the unhandled interrupts. But that patch just ACKs everything. root@CX9020:~# cat /proc/interrupts | grep rtc 40: 0 tzic 24 Edge 53fa4000.srtc 41: 0 tzic 25 Edge 53fa4000.srtc root@CX9020:~# hwclock -D -r hwclock from util-linux 2.29.2 Using the /dev interface to the clock. Last drift adjustment done at 1490885082 seconds after 1969 Last calibration done at 1490885082 seconds after 1969 Hardware clock is on UTC time Assuming hardware clock is kept in UTC time. Waiting for clock tick... select() to /dev/rtc to wait for clock tick timed out...synchronization failed root@CX9020:~# cat /proc/interrupts | grep rtc 40: 301844 tzic 24 Edge 53fa4000.srtc 41: 0 tzic 25 Edge 53fa4000.srtc From 422747686f5723ac75b98ad610b3ef4d94ef271f Mon Sep 17 00:00:00 2001 From: Patrick Bruenn <p.bruenn@beckhoff.com> Date: Tue, 14 Nov 2017 05:23:24 +0100 Subject: [PATCH] XXX: disable interrupts manually --- drivers/rtc/rtc-imxdi.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/drivers/rtc/rtc-imxdi.c b/drivers/rtc/rtc-imxdi.c index 80931114c899..4b64a5350bac 100644 --- a/drivers/rtc/rtc-imxdi.c +++ b/drivers/rtc/rtc-imxdi.c @@ -686,6 +686,24 @@ static irqreturn_t dryice_irq(int irq, void *dev_id) dier = readl(imxdi->ioaddr + DIER); dsr = readl(imxdi->ioaddr + DSR); + /* ack monotonic counter overflow */ + if (DSR_MCO == dsr) { + return IRQ_HANDLED; + } + if (dier & DIER_WCIE) { + if (dsr & DSR_MCO) { + di_int_disable(imxdi, DIER_WCIE); + return IRQ_HANDLED; + } + } + + if (dier & DIER_CAIE) { + if (dsr & DSR_MCO) { + di_int_disable(imxdi, DIER_CAIE); + return IRQ_HANDLED; + } + } + /* handle the security violation event */ if (dier & DIER_SVIE) { if (dsr & DSR_SVF) { @@ -710,7 +728,10 @@ static irqreturn_t dryice_irq(int irq, void *dev_id) operations. It means the interrupt is for DryIce -Security. IRQ must be returned as none.*/ if (list_empty_careful(&imxdi->write_wait.head)) + { + printk("rtc: XXXX: dier: 0x%x dsr: 0x%x\n", dier, dsr); return rc; + } /* DSR_WCF clears itself on DSR read */ if (dsr & (DSR_WCF | DSR_WEF)) { @@ -737,6 +758,9 @@ static irqreturn_t dryice_irq(int irq, void *dev_id) rc = IRQ_HANDLED; } } + if (rc != IRQ_HANDLED) { + printk("rtc: XXXX: dier: 0x%x dsr: 0x%x\n", dier, dsr); + } return rc; } -- 2.11.0 Beckhoff Automation GmbH & Co. KG | Managing Director: Dipl. Phys. Hans Beckhoff Registered office: Verl, Germany | Register court: Guetersloh HRA 7075
HI all, I've been digging a while in the DryIce code (some time ago, it was in a hurry because I needed to release). I finally ended up by NOT using the DryIce code , for the IMX53 ( internal RTC) If I recall correctly , this is not the correct driver for the Internal IMX53 RTC, ( for example the register BASE-Addresses / offsets are not correct..) resulting in all kind of strange behavior, depending on your situational use-cases:-( Best Regards Noel _______________________ Noel Vellemans BMS bvba -----Original Message----- From: Patrick Brünn [mailto:P.Bruenn@beckhoff.com] Sent: Tuesday, November 14, 2017 6:00 AM To: Fabio Estevam; Alexandre Belloni Cc: Vellemans, Noel; linux-arm-kernel@lists.infradead.org; linux-rtc@vger.kernel.org Subject: RE: DryIce , RTC not working on imx53. >From: Fabio Estevam [mailto:festevam@gmail.com] >Sent: Montag, 13. November 2017 19:57 >> I don't recall of any recent change in this area. >> I don't think the behavior changed recently. I tried a kernel 4.4.65 and it shows the same symptoms. I guess Noel really means 3.19-> 4.0. >> Patrick/Noel, >> >> Does the change below help? Unfortunately no. Did you run hwclock or rtctest? I still see: root@CX9020:~# cat /proc/interrupts | grep rtc 40: 0 tzic 24 Edge 53fa4000.srtc 41: 0 tzic 25 Edge 53fa4000.srtc root@CX9020:~# hwclock -D -r hwclock from util-linux 2.29.2 Using the /dev interface to the clock. Last drift adjustment done at 1490885082 seconds after 1969 Last calibration done at 1490885082 seconds after 1969 Hardware clock is on UTC time Assuming hardware clock is kept in UTC time. Waiting for clock tick... [ 41.035269] irq 40: nobody cared (try booting with the "irqpoll" option) [ 41.042514] handlers: [ 41.044847] [<c06031e0>] dryice_irq [ 41.048398] Disabling IRQ #40 select() to /dev/rtc to wait for clock tick timed out...synchronization failed root@CX9020:~# cat /proc/interrupts | grep rtc 40: 100000 tzic 24 Edge 53fa4000.srtc 41: 0 tzic 25 Edge 53fa4000.srtc or if I run rtctest from tools/testing/selftests/timers/ (after reboot): root@CX9020:~# cat /proc/interrupts | grep rtc 40: 0 tzic 24 Edge 53fa4000.srtc 41: 0 tzic 25 Edge 53fa4000.srtc root@CX9020:~# ./rtctest RTC Driver Test Example. Counting 5 update (1/sec) interrupts from reading /dev/rtc0:[ 37.550399] irq 40: nobody cared (try booting with the "irqpoll" option) [ 37.557646] handlers: [ 37.559980] [<c06031e0>] dryice_irq [ 37.563532] Disabling IRQ #40 ^C root@CX9020:~# cat /proc/interrupts | grep rtc 40: 100000 tzic 24 Edge 53fa4000.srtc 41: 0 tzic 25 Edge 53fa4000.srtc With the attached patch I get rid of the unhandled interrupts. But that patch just ACKs everything. root@CX9020:~# cat /proc/interrupts | grep rtc 40: 0 tzic 24 Edge 53fa4000.srtc 41: 0 tzic 25 Edge 53fa4000.srtc root@CX9020:~# hwclock -D -r hwclock from util-linux 2.29.2 Using the /dev interface to the clock. Last drift adjustment done at 1490885082 seconds after 1969 Last calibration done at 1490885082 seconds after 1969 Hardware clock is on UTC time Assuming hardware clock is kept in UTC time. Waiting for clock tick... select() to /dev/rtc to wait for clock tick timed out...synchronization failed root@CX9020:~# cat /proc/interrupts | grep rtc 40: 301844 tzic 24 Edge 53fa4000.srtc 41: 0 tzic 25 Edge 53fa4000.srtc From 422747686f5723ac75b98ad610b3ef4d94ef271f Mon Sep 17 00:00:00 2001 From: Patrick Bruenn <p.bruenn@beckhoff.com> Date: Tue, 14 Nov 2017 05:23:24 +0100 Subject: [PATCH] XXX: disable interrupts manually --- drivers/rtc/rtc-imxdi.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/drivers/rtc/rtc-imxdi.c b/drivers/rtc/rtc-imxdi.c index 80931114c899..4b64a5350bac 100644 --- a/drivers/rtc/rtc-imxdi.c +++ b/drivers/rtc/rtc-imxdi.c @@ -686,6 +686,24 @@ static irqreturn_t dryice_irq(int irq, void *dev_id) dier = readl(imxdi->ioaddr + DIER); dsr = readl(imxdi->ioaddr + DSR); + /* ack monotonic counter overflow */ + if (DSR_MCO == dsr) { + return IRQ_HANDLED; + } + if (dier & DIER_WCIE) { + if (dsr & DSR_MCO) { + di_int_disable(imxdi, DIER_WCIE); + return IRQ_HANDLED; + } + } + + if (dier & DIER_CAIE) { + if (dsr & DSR_MCO) { + di_int_disable(imxdi, DIER_CAIE); + return IRQ_HANDLED; + } + } + /* handle the security violation event */ if (dier & DIER_SVIE) { if (dsr & DSR_SVF) { @@ -710,7 +728,10 @@ static irqreturn_t dryice_irq(int irq, void *dev_id) operations. It means the interrupt is for DryIce -Security. IRQ must be returned as none.*/ if (list_empty_careful(&imxdi->write_wait.head)) + { + printk("rtc: XXXX: dier: 0x%x dsr: 0x%x\n", + dier, dsr); return rc; + } /* DSR_WCF clears itself on DSR read */ if (dsr & (DSR_WCF | DSR_WEF)) { @@ -737,6 +758,9 @@ static irqreturn_t dryice_irq(int irq, void *dev_id) rc = IRQ_HANDLED; } } + if (rc != IRQ_HANDLED) { + printk("rtc: XXXX: dier: 0x%x dsr: 0x%x\n", dier, dsr); + } return rc; } -- 2.11.0 Beckhoff Automation GmbH & Co. KG | Managing Director: Dipl. Phys. Hans Beckhoff Registered office: Verl, Germany | Register court: Guetersloh HRA 7075
Hi Patrick, On Tue, Nov 14, 2017 at 3:00 AM, Patrick Brünn <P.Bruenn@beckhoff.com> wrote: >>From: Fabio Estevam [mailto:festevam@gmail.com] >>Sent: Montag, 13. November 2017 19:57 >>> I don't recall of any recent change in this area. >>> > I don't think the behavior changed recently. I tried a kernel 4.4.65 and it shows the same symptoms. I guess Noel really means 3.19-> 4.0. Or maybe by 'old kernel' he meant the vendor 2.6.35 kernel. I have the impression that the dryice driver has never worked in mainlune for mx53. > Unfortunately no. Did you run hwclock or rtctest? Yes, this is what I get: # hwclock -r -D hwclock from util-linux 2.31 System Time: 14.876372 Trying to open: /dev/rtc0 Using the rtc interface to the clock. Last drift adjustment done at 2167 seconds after 1969 Last calibrat[ 14.892484] imxdi_rtc 53fa4000.srtc: Write-wait timeout val = 08 ion done at 2167 seconds after 1969 Hardware clock is on UTC time Assuming hardware clock is kept in UTC time. Waiting for clock tick... hwclock: select() to /dev/rtc0 to wait for clock tick timed out ...synchronization failed > I still see: > root@CX9020:~# cat /proc/interrupts | grep rtc > 40: 0 tzic 24 Edge 53fa4000.srtc > 41: 0 tzic 25 Edge 53fa4000.srtc > root@CX9020:~# hwclock -D -r > hwclock from util-linux 2.29.2 > Using the /dev interface to the clock. > Last drift adjustment done at 1490885082 seconds after 1969 > Last calibration done at 1490885082 seconds after 1969 > Hardware clock is on UTC time > Assuming hardware clock is kept in UTC time. > Waiting for clock tick... > [ 41.035269] irq 40: nobody cared (try booting with the "irqpoll" option) > [ 41.042514] handlers: > [ 41.044847] [<c06031e0>] dryice_irq > [ 41.048398] Disabling IRQ #40 This error I don't get with the 2.31 hwclock version I tried.
Hi Noel, On Tue, Nov 14, 2017 at 4:40 AM, Vellemans, Noel <Noel.Vellemans@visionbms.com> wrote: > HI all, > > I've been digging a while in the DryIce code (some time ago, it was in a hurry because I needed to release). > > I finally ended up by NOT using the DryIce code , for the IMX53 ( internal RTC) > > If I recall correctly , this is not the correct driver for the Internal IMX53 RTC, ( for example the register BASE-Addresses / offsets are not correct..) > resulting in all kind of strange behavior, depending on your situational use-cases:-( Could you clarify about this? Which base address or offsets are not correct?
+Cc Juergen On 14/11/2017 at 08:12:03 -0200, Fabio Estevam wrote: > Hi Patrick, > > On Tue, Nov 14, 2017 at 3:00 AM, Patrick Brünn <P.Bruenn@beckhoff.com> wrote: > >>From: Fabio Estevam [mailto:festevam@gmail.com] > >>Sent: Montag, 13. November 2017 19:57 > >>> I don't recall of any recent change in this area. > >>> > > I don't think the behavior changed recently. I tried a kernel 4.4.65 and it shows the same symptoms. I guess Noel really means 3.19-> 4.0. > > Or maybe by 'old kernel' he meant the vendor 2.6.35 kernel. > > I have the impression that the dryice driver has never worked in > mainlune for mx53. > I doubt that because it seems to have been used by Pengutronix. > > Unfortunately no. Did you run hwclock or rtctest? > > Yes, this is what I get: > > # hwclock -r -D > hwclock from util-linux 2.31 > System Time: 14.876372 > Trying to open: /dev/rtc0 > Using the rtc interface to the clock. > Last drift adjustment done at 2167 seconds after 1969 > Last calibrat[ 14.892484] imxdi_rtc 53fa4000.srtc: Write-wait timeout val = 08 > ion done at 2167 seconds after 1969 > Hardware clock is on UTC time > Assuming hardware clock is kept in UTC time. > Waiting for clock tick... > hwclock: select() to /dev/rtc0 to wait for clock tick timed out > ...synchronization failed > > > > I still see: > > root@CX9020:~# cat /proc/interrupts | grep rtc > > 40: 0 tzic 24 Edge 53fa4000.srtc > > 41: 0 tzic 25 Edge 53fa4000.srtc > > root@CX9020:~# hwclock -D -r > > hwclock from util-linux 2.29.2 > > Using the /dev interface to the clock. > > Last drift adjustment done at 1490885082 seconds after 1969 > > Last calibration done at 1490885082 seconds after 1969 > > Hardware clock is on UTC time > > Assuming hardware clock is kept in UTC time. > > Waiting for clock tick... > > [ 41.035269] irq 40: nobody cared (try booting with the "irqpoll" option) > > [ 41.042514] handlers: > > [ 41.044847] [<c06031e0>] dryice_irq > > [ 41.048398] Disabling IRQ #40 > > This error I don't get with the 2.31 hwclock version I tried.
Hi Fabio
It's been a while... ( but I'm quite sure), if you look closely at the register defines ( into the DRYICE-driver-code) then you will notice... that SOME registers offsets are correct , but others are not matching the INTERNAL rtc of the IMX53.
When I noticed that ( I skipped RTC driver functionality, under release pressure, I had still many items to test on those kernel , and I was under release pressure.. so I removed RTC for the time being.)
{ you can get basic RTC , timer only , no alarms/events working... by commenting a lot of things out, but .. I decided to solve this later the correct way, when I find some time ( and to report back when solved, didn't want to bother many people, or otherwise said didn't want make too many noise .... ( because rtc is not critical in my application ) }
This driver will not work for the INTERNAL-RTC ( rtc into the IMX53), and will never have worked, I can confirm this, it might have worked for some other variant of the RTC, but it will not do what we all expected for the RTC located into IMX53!
Regards
Noel
PS: Just for info, at this time I'm investigating a NOT booting problem .. and .. it’s a hard one ( keeps me busy for some day's already ... let's say in a 500 boots there is one issue where the 'kernel' locks-up in a very very early stage.. (into the first mili-sec of the boot it hangs, some-where around IRQ-initialization .. all blocks , before CPU-identification... no clue yet where exactly..!)
{ it's only happening in latest kernels 4.4.x / 4.1x.x , older 2.6.35 do not suffer this none boot behavior ( on the same hardware) , so .. digging / debugging / printing.. :-) at this time }
_______________________
Noel Vellemans
BMS bvba
-----Original Message-----
From: Fabio Estevam [mailto:festevam@gmail.com]
Sent: Tuesday, November 14, 2017 11:13 AM
To: Vellemans, Noel
Cc: Patrick Brünn; Alexandre Belloni; linux-arm-kernel@lists.infradead.org; linux-rtc@vger.kernel.org
Subject: Re: DryIce , RTC not working on imx53.
Hi Noel,
On Tue, Nov 14, 2017 at 4:40 AM, Vellemans, Noel <Noel.Vellemans@visionbms.com> wrote:
> HI all,
>
> I've been digging a while in the DryIce code (some time ago, it was in a hurry because I needed to release).
>
> I finally ended up by NOT using the DryIce code , for the IMX53 (
> internal RTC)
>
> If I recall correctly , this is not the correct driver for the
> Internal IMX53 RTC, ( for example the register BASE-Addresses /
> offsets are not correct..) resulting in all kind of strange behavior,
> depending on your situational use-cases:-(
Could you clarify about this? Which base address or offsets are not correct?
On Tue, Nov 14, 2017 at 8:26 AM, Alexandre Belloni <alexandre.belloni@free-electrons.com> wrote: >> I have the impression that the dryice driver has never worked in >> mainlune for mx53. >> > > I doubt that because it seems to have been used by Pengutronix. Juergen can confirm, but it seems the dryice driver was only used on mx25 in mainline.
On 14/11/2017 at 08:33:09 -0200, Fabio Estevam wrote: > On Tue, Nov 14, 2017 at 8:26 AM, Alexandre Belloni > <alexandre.belloni@free-electrons.com> wrote: > > >> I have the impression that the dryice driver has never worked in > >> mainlune for mx53. > >> > > > > I doubt that because it seems to have been used by Pengutronix. > > Juergen can confirm, but it seems the dryice driver was only used on > mx25 in mainline. Ok, that would explain it.
Hi, On Tuesday 14 November 2017 11:55:17 Alexandre Belloni wrote: > On 14/11/2017 at 08:33:09 -0200, Fabio Estevam wrote: > > On Tue, Nov 14, 2017 at 8:26 AM, Alexandre Belloni > > > > <alexandre.belloni@free-electrons.com> wrote: > > >> I have the impression that the dryice driver has never worked in > > >> mainlune for mx53. > > > > > > I doubt that because it seems to have been used by Pengutronix. > > > > Juergen can confirm, but it seems the dryice driver was only used on > > mx25 in mainline. > > Ok, that would explain it. Yes. The development was made on an i.MX25. But currently I have an i.MX53 on my desk here and could test... jb
Hi all, Juergen It won't work ( as it is) , registers are not on the correct offsets and some bits are not on the same positions ( for the IMX53) This driver will not work for the INTERNAL-RTC ( rtc into the IMX53), and will never have worked ( on IMX53). I can confirm, it might work for some other variant of the RTC, but it will not do what we all expected for the RTC located into IMX53! ( not sure my previous mail got to the destination) Best Regards Noel >> >> > Juergen can confirm, but it seems the dryice driver was only used on > > mx25 in mainline. >> >>> Ok, that would explain it. >> >>Yes. The development was made on an i.MX25. But currently I have an i.MX53 on my desk here and could test... >> >>jb >>> >> >> >> >>-----Original Message----- >>From: Vellemans, Noel >>Sent: Tuesday, November 14, 2017 11:30 AM >>To: 'Fabio Estevam' >>Cc: Patrick Brünn; Alexandre Belloni; linux-arm-kernel@lists.infradead.org; linux-rtc@vger.kernel.org >>Subject: RE: DryIce , RTC not working on imx53. >> >>Hi Fabio >> >>It's been a while... ( but I'm quite sure), if you look closely at the register defines ( into the DRYICE-driver-code) then you will notice... that SOME registers offsets are correct , but others are not matching the INTERNAL rtc of the IMX53. >> >>When I noticed that ( I skipped RTC driver functionality, under release pressure, I had still many items to test on those kernel , and I was under release pressure.. so I removed RTC for the time being.) >> >>{ you can get basic RTC , timer only , no alarms/events working... by commenting a lot of things out, but .. I decided to solve this later the correct way, when I find some time ( and to report back when solved, didn't want to bother many people, or otherwise said didn't want make too many noise .... ( because rtc is not critical in my application ) } >> >>This driver will not work for the INTERNAL-RTC ( rtc into the IMX53), and will never have worked, I can confirm this, it might have worked for some other variant of the RTC, but it will not do what we all expected for the RTC located into IMX53! >> >> >>Regards >>Noel >> >>PS: Just for info, at this time I'm investigating a NOT booting problem .. and .. it’s a hard one ( keeps me busy for some day's already ... let's say in a 500 boots there is one issue where the 'kernel' locks-up in a >>very very early stage.. (into the first mili-sec of the boot it hangs, some-where around IRQ-initialization .. all blocks , before CPU-identification... no clue yet where exactly..!) >>{ it's only happening in latest kernels 4.4.x / 4.1x.x , older 2.6.35 do not suffer this none boot behavior ( on the same hardware) , so .. digging / debugging / printing.. :-) at this time }
Hi all, On Tuesday 14 November 2017 13:43:14 Myself wrote: > On Tuesday 14 November 2017 11:55:17 Alexandre Belloni wrote: > > On 14/11/2017 at 08:33:09 -0200, Fabio Estevam wrote: > > > On Tue, Nov 14, 2017 at 8:26 AM, Alexandre Belloni > > > > > > <alexandre.belloni@free-electrons.com> wrote: > > > >> I have the impression that the dryice driver has never worked in > > > >> mainlune for mx53. > > > > > > > > I doubt that because it seems to have been used by Pengutronix. > > > > > > Juergen can confirm, but it seems the dryice driver was only used on > > > mx25 in mainline. > > > > Ok, that would explain it. > > Yes. The development was made on an i.MX25. But currently I have an > i.MX53 on my desk here and could test... After a quick look into the reference manuals: Patch 5b72505 ("ARM: dts: imx53: add srtc node") is bad. The i.MX53 provides an RTC more close to the i.MX6 instead (e.g. rtc-snvs.c). But unfortunately it uses a different register layout than the i.MX6 does. So we can't use this driver without i.MX53 specific adaptions. But at least 5b72505 should be reverted. jb
On Wed, Nov 15, 2017 at 7:53 AM, Juergen Borleis <jbe@pengutronix.de> wrote: > After a quick look into the reference manuals: > > Patch 5b72505 ("ARM: dts: imx53: add srtc node") is bad. The i.MX53 provides > an RTC more close to the i.MX6 instead (e.g. rtc-snvs.c). But unfortunately > it uses a different register layout than the i.MX6 does. So we can't use > this driver without i.MX53 specific adaptions. > But at least 5b72505 should be reverted. Agreed. Looked in the vendor kernel and this is the rtc driver for mx53: http://git.freescale.com/git/cgit.cgi/imx/linux-2.6-imx.git/tree/drivers/rtc/rtc-mxc_v2.c?h=imx_2.6.35_11.09.01 ,which is a different one from the dryice one: http://git.freescale.com/git/cgit.cgi/imx/linux-2.6-imx.git/tree/drivers/rtc/rtc-imxdi.c?h=imx_2.6.35_11.09.01 I will send a revert for 5b72505 ("ARM: dts: imx53: add srtc node"). Thanks
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
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@beckhoff.com> 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@beckhoff.com> Signed-off-by: Shawn Guo <shawnguo@kernel.org>