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

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Date:   Tue, 2 Feb 2021 16:50:12 -0800
From:   Benjamin Li <benl@...areup.com>
To:     Georgi Djakov <georgi.djakov@...aro.org>,
        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

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.

Ben