linux-kernel - Re: [PATCH v11 5/8] interconnect: qcom: Add sdm845 interconnect provider driver

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Date:   Sat, 8 Dec 2018 02:24:03 +0200
From:   Georgi Djakov <georgi.djakov@...aro.org>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     gregkh@...uxfoundation.org, linux-pm@...r.kernel.org,
        rjw@...ysocki.net, robh+dt@...nel.org, mturquette@...libre.com,
        khilman@...libre.com, vincent.guittot@...aro.org,
        skannan@...eaurora.org, bjorn.andersson@...aro.org,
        amit.kucheria@...aro.org, seansw@....qualcomm.com,
        daidavid1@...eaurora.org, evgreen@...omium.org,
        dianders@...omium.org, mark.rutland@....com,
        lorenzo.pieralisi@....com, abailon@...libre.com,
        maxime.ripard@...tlin.com, arnd@...db.de, thierry.reding@...il.com,
        ksitaraman@...dia.com, sanjayc@...dia.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, linux-tegra@...r.kernel.org
Subject: Re: [PATCH v11 5/8] interconnect: qcom: Add sdm845 interconnect
 provider driver

Hi Matthias,

Thanks for looking into this.

On 8.12.18 1:30, Matthias Kaehlcke wrote:
> Hi Georgi,
> 
> not a full review, only one thing I just stumbled across:
> 
> On Fri, Dec 07, 2018 at 05:29:14PM +0200, Georgi Djakov wrote:
>> From: David Dai <daidavid1@...eaurora.org>
>>
>> Introduce Qualcomm SDM845 specific provider driver using the
>> interconnect framework.
>>
>> Signed-off-by: David Dai <daidavid1@...eaurora.org>
>> Signed-off-by: Georgi Djakov <georgi.djakov@...aro.org>
>> ---
>>  .../bindings/interconnect/qcom,sdm845.txt     |  24 +
>>  drivers/interconnect/Kconfig                  |   5 +
>>  drivers/interconnect/Makefile                 |   1 +
>>  drivers/interconnect/qcom/Kconfig             |  13 +
>>  drivers/interconnect/qcom/Makefile            |   5 +
>>  drivers/interconnect/qcom/sdm845.c            | 836 ++++++++++++++++++
>>  .../dt-bindings/interconnect/qcom,sdm845.h    | 143 +++
>>  7 files changed, 1027 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/interconnect/qcom,sdm845.txt
>>  create mode 100644 drivers/interconnect/qcom/Kconfig
>>  create mode 100644 drivers/interconnect/qcom/Makefile
>>  create mode 100644 drivers/interconnect/qcom/sdm845.c
>>  create mode 100644 include/dt-bindings/interconnect/qcom,sdm845.h
>>
>> ...
>>
>> diff --git a/drivers/interconnect/qcom/sdm845.c b/drivers/interconnect/qcom/sdm845.c
>> new file mode 100644
>> index 000000000000..f594dd6f500f
>> --- /dev/null
>> +++ b/drivers/interconnect/qcom/sdm845.c
>>
>> ...
>>
>> +static int qcom_icc_bcm_init(struct qcom_icc_bcm *bcm, struct device *dev)
>> +{
>> +	struct qcom_icc_node *qn;
>> +	int ret, i;
>> +
>> +	bcm->addr = cmd_db_read_addr(bcm->name);
>> +	if (!bcm->addr) {
>> +		dev_err(dev, "%s could not find RPMh address\n",
>> +			bcm->name);
>> +		return -EINVAL;
>> +	}
>> +
>> +	if (cmd_db_read_aux_data_len(bcm->name) < sizeof(struct bcm_db)) {
>> +		dev_err(dev, "%s command db missing or partial aux data\n",
>> +			bcm->name);
>> +		return -EINVAL;
>> +	}
> 
> cmd_db_read_aux_data_len() is in the process of being removed, see
> ed3cafa79ea7 ("soc: qcom: cmd-db: Stop memcpy()ing in
> cmd_db_read_aux_data()") in arm-soc/for-next
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc.git/commit/?h=for-next&id=ed3cafa79ea756be653d22087c017af95ea78a49

Yes, exactly. I have a fix that lives as a separate patch [8/8] and will squash it here.

BR,
Georgi