linux-kernel - Re: [PATCH v1 1/3] PCI: qcom: Add missing sc7280 clocks in PCIe driver

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Message-ID: <20220624170501.GA1541553@bhelgaas>
Date:   Fri, 24 Jun 2022 12:05:01 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Krishna chaitanya chundru <quic_krichai@...cinc.com>
Cc:     linux-pci@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, quic_vbadigan@...cinc.com,
        quic_hemantk@...cinc.com, quic_nitegupt@...cinc.com,
        quic_skananth@...cinc.com, quic_ramkri@...cinc.com,
        manivannan.sadhasivam@...aro.org, swboyd@...omium.org,
        dmitry.baryshkov@...aro.org, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Stanimir Varbanov <svarbanov@...sol.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Prasad Malisetty <pmaliset@...eaurora.org>
Subject: Re: [PATCH v1 1/3] PCI: qcom: Add missing sc7280 clocks in PCIe
 driver

[+cc Prasad, who added sc7280]

On Fri, Jun 24, 2022 at 02:49:49PM +0530, Krishna chaitanya chundru wrote:
> Add missing clocks in the pcie driver.

s/pcie/PCIe/ as in subject.  Also, please mention the names of the
clocks here, too.

Does this add new functionality, or did sc7280 just never work in the
first place?

If this fixes a problem, it's nice to mention the user-visible symptom
in the commit log to make it easier to connect this fix with the
problem.

Looks like sc7280 was added by Prasad with b89ff410253d ("PCI: qcom:
Replace ops with struct pcie_cfg in pcie match data"), and I assume it
was tested at that time.

If I had noticed, I would have asked that b89ff410253d be a strict
conversion to struct qcom_pcie_cfg with no functional changes, with
sc7280 support being added in a separate patch by itself.

> Signed-off-by: Krishna chaitanya chundru <quic_krichai@...cinc.com>
> ---
>  drivers/pci/controller/dwc/pcie-qcom.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
> index 2ea1375..a7202f0 100644
> --- a/drivers/pci/controller/dwc/pcie-qcom.c
> +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> @@ -1548,7 +1548,10 @@ static const struct qcom_pcie_cfg sm8450_pcie1_cfg = {
>  static const struct qcom_pcie_cfg sc7280_cfg = {
>  	.ops = &ops_1_9_0,
>  	.has_tbu_clk = true,
> +	.has_ddrss_sf_tbu_clk = true,
>  	.pipe_clk_need_muxing = true,
> +	.has_aggre0_clk = true,
> +	.has_aggre1_clk = true,
>  };
>  
>  static const struct qcom_pcie_cfg sc8180x_cfg = {
> -- 
> 2.7.4
>