linux-kernel - Re: [PATCH v2] pwm: tiehrpwm: Enable EHRPWM controller before setting configuration

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Message-ID: <hvz5lw4xvujmdruoi2h2wk4dvanyg7y5xp5tp2rs4dygmza3s3@idcjbz6wbxh4>
Date: Mon, 12 Jan 2026 08:22:41 +0100
From: Uwe Kleine-König <ukleinek@...nel.org>
To: Gokul Praveen <g-praveen@...com>
Cc: "Rafael V. Volkmer" <rafael.v.volkmer@...il.com>, j-keerthy@...com, 
	linux-kernel@...r.kernel.org, linux-pwm@...r.kernel.org, n-francis@...com, u-kumar1@...com
Subject: Re: [PATCH v2] pwm: tiehrpwm: Enable EHRPWM controller before
 setting configuration

Hello Gokul,

On Mon, Jan 12, 2026 at 11:21:50AM +0530, Gokul Praveen wrote:
> On 10/01/26 04:23, Uwe Kleine-König wrote:
> > As I cannot reproduce the issue, can you please check if adding
> > 
> > 	pm_runtime_get_sync(pwmchip_parent(chip));
> > 
> > to the probe function makes the problem disappear? Also please boot with
> > 
> > 	trace_event=pwm
> > 
> > on the command line and provide the content of
> > /sys/kernel/debug/tracing/trace after reproducing the problem.
> 
> sure Uwe, I will try this from my side.
> 
> In the meantime, will you able to test the same on TI J784S4 EVM as the
> issue was reproduced on this board.

I don't have such hardware, sorry. The boards with TI SoC on my desk are
only a Beaglebone Black and a BeaglePlay. (And I didn't setup the
BeaglePlay yet, it was already quite a hassle to make the boneblack work
with a recent kernel. In the end it looks trivial, but
https://salsa.debian.org/kernel-team/linux/-/merge_requests/1777 plus
unreliable netbooting in the bootloader took me several hours to sort
out.)

Best regards
Uwe

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