Hi, Hugo.
Thank you. Yes, I have clock source set to xtal and thanks for the tip on the delay you shared. I think my issue may be due to how I defined my interrupts in the dts file for the arm. Thanks again for your feedback!
Usha
> -----Original Message-----
> From: Hugo Villeneuve <hugo@xxxxxxxxxxx>
> Sent: Wednesday, January 10, 2024 5:40 PM
> To: Srinivasan, Usha <usha.srinivasan@xxxxxxxxxxxxxxxxxxxx>
> Cc: linux-serial@xxxxxxxxxxxxxxx
> Subject: Re: max14830 irq
>
> On Tue, 9 Jan 2024 21:25:03 +0000
> "Srinivasan, Usha" <usha.srinivasan@xxxxxxxxxxxxxxxxxxxx> wrote:
>
> > Hi Hugo.
> > Thanks so much for your response.
> >
> > I was building with 6.1 had one patch but not the other. I brought over the
> 2nd patch as well but made no difference.
> >
> > I switched from 6.1 to 6.6 which has both patches and still the same issue.
> >
> > What do you suggest next?
> > Usha
>
> Hi,
> let's hope that someone with more experience with this IC can help you.
>
> In the meantime, see my comments below...
>
>
> > > -----Original Message-----
> > > From: Hugo Villeneuve <hugo@xxxxxxxxxxx>
> > > Sent: Monday, January 8, 2024 5:30 PM
> > > To: Srinivasan, Usha <usha.srinivasan@xxxxxxxxxxxxxxxxxxxx>
> > > Cc: linux-serial@xxxxxxxxxxxxxxx
> > > Subject: Re: max14830 irq
> > >
> > > On Mon, 8 Jan 2024 19:08:08 +0000
> > > "Srinivasan, Usha" <usha.srinivasan@xxxxxxxxxxxxxxxxxxxx> wrote:
> > >
> > > > Hello,
> > > > I am trying to get max14830 working on our platform and I'm seeing
> > > > a stack
> > > trace for each of the UARTs in my device tree. I'm not sure what
> > > the fix is. I'm running 6.1.15-580639a (OpenBMC 2.14.0) on ASPEED
> > > ast2600. Any help appreciated.
> > > > [ 2.608620] max310x 11-006c: clock is not stable yet
>
> I assume that your clock source is defined as a crystal (xtal) in your device
> tree. Is it really the case (xtal vs oscillator)?
>
> If yes, do you see this warning message every time? I noticed that Boundary
> devices have a patch in their private repo where they increased the delay to
> detect a stable crystal from 10ms to 100ms (but they do not explain why).
>
> Can you try that:
>
> @@ -610,7 +610,7 @@ static u32 max310x_set_ref_clk(struct device *dev,
> struct max310x_port *s, if (xtal) {
> unsigned int val;
>
> - msleep(10);
> + msleep(100);
> regmap_read(s->regmap, MAX310X_STS_IRQSTS_REG, &val);
>
> Hugo Villeneuve
>
>
> > > > [ 2.614933] 11-006c: ttyMAX0 at I/O 0x0 (irq = 57, base_baud =
> 3750000) is a
> > > MAX14830
> > > > [ 2.625532] 11-006c: ttyMAX1 at I/O 0x1 (irq = 57, base_baud =
> 3750000) is a
> > > MAX14830
> > > > [ 2.636061] 11-006c: ttyMAX2 at I/O 0x2 (irq = 57, base_baud =
> 3750000) is a
> > > MAX14830
> > > > [ 2.646513] 11-006c: ttyMAX3 at I/O 0x3 (irq = 57, base_baud =
> 3750000) is a
> > > MAX14830
> > >
> > > Hi,
> > > it seems you have I2C communication with your device and the ID
> > > register was read correctly in the probe() function. If it was not
> > > the case, you would have an error message about that.
> > >
> > > > And,
> > > > [ 88.430219] irq 57: nobody cared (try booting with the "irqpoll"
> option)
> > >
> > > This is probalbly happening because max310x_ist() was called, but
> > > when it exited the interrupt line was still active, so that it was not
> handled properly.
> > >
> > > Can you make sure you have the following two patches in your kernel
> > > version:
> > >
> > > 984a4afdc87a ("regmap: prevent noinc writes from clobbering cache")
> > > c94e5baa989f ("serial: max310x: fix IO data corruption in batched
> > > operations")
> > >
> > > I do not have hardware to test it, and this is a wild guess, but
> > > they may be relevant to your problem because they enable the FIFOs
> > > to be read/written properly. If Rx FIFO for example cannot be read,
> > > the source of the interrupt cannot be cleared, and could potentially
> explain your problem.
> > >
> > > Hugo Villeneuve
> > >
> > >
> > > > [ 88.437720] CPU: 0 PID: 65 Comm: irq/57-11-006c Not tainted 6.1.15-
> > > 580639a #1
> > > > [ 88.445687] Hardware name: Generic DT based system
> > > > [ 88.451046] unwind_backtrace from show_stack+0x18/0x1c
> > > > [ 88.456906] show_stack from dump_stack_lvl+0x40/0x4c
> > > > [ 88.462556] dump_stack_lvl from __report_bad_irq+0x44/0xc8
> > > > [ 88.468784] __report_bad_irq from note_interrupt+0x2c8/0x314
> > > > [ 88.475208] note_interrupt from handle_irq_event+0x90/0x94
> > > > [ 88.481436] handle_irq_event from handle_level_irq+0xbc/0x1b4
> > > > [ 88.487952] handle_level_irq from
> generic_handle_domain_irq+0x30/0x40
> > > > [ 88.495253] generic_handle_domain_irq from
> > > aspeed_gpio_irq_handler+0xac/0x158
> > > > [ 88.503326] aspeed_gpio_irq_handler from
> > > generic_handle_domain_irq+0x30/0x40
> > > > [ 88.511305] generic_handle_domain_irq from
> gic_handle_irq+0x6c/0x80
> > > > [ 88.518411] gic_handle_irq from generic_handle_arch_irq+0x34/0x44
> > > > [ 88.525316] generic_handle_arch_irq from call_with_stack+0x18/0x20
> > > > [ 88.532328] call_with_stack from __irq_svc+0x98/0xb0
> > > > [ 88.537973] Exception stack(0xbf925eb0 to 0xbf925ef8)
> > > > [ 88.543614] 5ea0: 45854088 00000003 00000001
> > > 00000000
> > > > [ 88.552742] 5ec0: 00000000 4184ee80 45854088 00000000 45854000
> > > 41a64140 00000000 00000000
> > > > [ 88.561870] 5ee0: 00000000 bf925f00 4016bb7c 4016bac0 600f0013
> ffffffff
> > > > [ 88.569252] __irq_svc from __wake_up_common_lock+0x1c/0xb8
> > > > [ 88.575483] __wake_up_common_lock from __wake_up+0x20/0x28
> > > > [ 88.581714] __wake_up from irq_thread+0x118/0x1ec
> > > > [ 88.587070] irq_thread from kthread+0xd8/0xf4
> > > > [ 88.592040] kthread from ret_from_fork+0x14/0x2c
> > > > [ 88.597288] Exception stack(0xbf925fb0 to 0xbf925ff8)
> > > > [ 88.602923] 5fa0: 00000000 00000000 00000000
> > > 00000000
> > > > [ 88.612053] 5fc0: 00000000 00000000 00000000 00000000 00000000
> > > 00000000 00000000 00000000
> > > > [ 88.621179] 5fe0: 00000000 00000000 00000000 00000000 00000013
> > > 00000000
> > > > [ 88.628559] handlers:
> > > > [ 88.631088] [<4f379e2c>] irq_default_primary_handler threaded
> > > [<26199d83>] max310x_ist
> > > > [ 88.639952] Disabling IRQ #57
> > > >
> > > > __________________________
> > > > Usha Srinivasan
> > External recipient
> >
>
>
> --
External recipient
