linux-kernel - Re: [PATCH v3 1/3] ARM: dts: da850: add cpu node and operating points to DT

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Message-ID: <3f6c906b-53b0-8284-bf4d-9b404f341e7b@ti.com>
Date:   Fri, 12 Apr 2019 19:23:01 +0530
From:   Sekhar Nori <nsekhar@...com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
CC:     Kevin Hilman <khilman@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        David Lechner <david@...hnology.com>,
        Adam Ford <aford173@...il.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH v3 1/3] ARM: dts: da850: add cpu node and operating points
 to DT

On 12/04/19 5:41 PM, Bartosz Golaszewski wrote:
> pt., 12 kwi 2019 o 13:26 Sekhar Nori <nsekhar@...com> napisał(a):
>>
>> Hi Bartosz,
>>
>> On 08/04/19 1:29 PM, Bartosz Golaszewski wrote:
>>> From: David Lechner <david@...hnology.com>
>>>
>>> This adds a cpu node and operating points to the common da850.dtsi file.
>>>
>>> Additionally, a regulator is added to the LEGO EV3 board along with
>>> some board-specific CPU configuration.
>>>
>>> Regulators need to be hooked up on other boards to get them working.
>>>
>>> Signed-off-by: David Lechner <david@...hnology.com>
>>> Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
>>
>> I remember you mentioning about some problems using OCHI and cpufreq
>> together. Are those resolved now? CPU PLL on DA850 can affect other
>> peripheral clock frequencies too. So enabling it should really be a
>> per-board decision.
>>
> 
> The problems are still there. I've never been able to find the
> culprit, but it also occurs on TI BSP in the same way (a couple
> cpufreq transitions will make the controller unresponsive).

Is that on LCDK as well? As I recall cpufreq was never enabled on LCDK
in TI BSP.

If the OHCI problem is present on LCDK, then there is a user visible
regression on mainline after this patch. Lets enable cpufreq in LCDK
only if all working peripherals keep working afterwards.

Thanks,
Sekhar