linux-kernel - Re: [PATCH v2 5/5] interconnect: qcom: Add MSM8939 interconnect provider driver

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Date:   Wed, 3 Feb 2021 08:49:40 +0200
From:   Georgi Djakov <georgi.djakov@...aro.org>
To:     Benjamin Li <benl@...areup.com>,
        Vincent Knecht <vincent.knecht@...loo.org>,
        Jun Nie <jun.nie@...aro.org>, devicetree@...r.kernel.org,
        bjorn.andersson@...aro.org, agross@...nel.org,
        linux-pm@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, robh@...nel.org
Cc:     shawn.guo@...aro.org
Subject: Re: [PATCH v2 5/5] interconnect: qcom: Add MSM8939 interconnect
 provider driver

Hi Ben,

On 2/3/21 02:50, Benjamin Li wrote:
> On 1/5/21 5:54 AM, Georgi Djakov wrote:
>> On 1/2/21 13:08, Vincent Knecht wrote:
>>> Le vendredi 04 décembre 2020 à 15:53 +0800, Jun Nie a écrit :
>>>> Add driver for the Qualcomm interconnect buses found in MSM8939 based
>>>> platforms. The topology consists of four NoCs that are controlled by
>>>> a remote processor that collects the aggregated bandwidth for each
>>>> master-slave pairs.
>>>>
>>>> Signed-off-by: Jun Nie <jun.nie@...aro.org>
>>>
>>> Shouldn't some rpm ids be changed like they were for msm8916 in the following patch ?
>>> c497f9322af9 ("interconnect: qcom: msm8916: Remove rpm-ids from non-RPM nodes")
>>> https://patchwork.kernel.org/project/linux-arm-msm/patch/20201112105140.10092-1-georgi.djakov@linaro.org/
>>
>> Maybe they should. I don't have the hardware to try it, but the test will be
>> to just add the NoC DT nodes, enable the driver and inspect the boot log for
>> messages like:
>> [    2.926647] qcom_icc_rpm_smd_send mas X error -6
>>
>> Thanks,
>> Georgi
> 
> Hi Vincent & Georgi,
> 
> Thanks, I ran your suggestion on an MSM8939 board (with an additional
> change to print slave IDs as well). Results:
> 
> [    1.901376] qcom_icc_rpm_smd_send slv 24 error -6
> [    2.005977] qcom_icc_rpm_smd_send mas 20 error -6
> [    2.010250] qcom_icc_rpm_smd_send slv 20 error -6
> [    2.014684] qcom_icc_rpm_smd_send slv 106 error -6
> [    2.019338] qcom_icc_rpm_smd_send slv 107 error -6
> [    2.024615] qcom_icc_rpm_smd_send slv 29 error -6
> [    2.028782] qcom_icc_rpm_smd_send mas 3 error -6
> [    2.034657] qcom_icc_rpm_smd_send mas 100 error -6
> (and there's another slv 131 that's hidden by the mas 100 failure)
> 
> Jun, I'll send you the patch I tested with to silence all these errors,
> if you want to just squash that into the next version of your patchset.

Thank you for doing this! Please send a follow-up patch as i already
queued Jun's patches.

Thanks,
Georgi