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Tue, 22 Feb 2022 15:45:29 -0800 (PST) Date: Tue, 22 Feb 2022 15:47:30 -0800 From: Bjorn Andersson To: Lorenzo Pieralisi Cc: Dmitry Baryshkov , Andy Gross , Rob Herring , Vinod Koul , Kishon Vijay Abraham I , Stanimir Varbanov , Bjorn Helgaas , Krzysztof Wilczy??ski , linux-arm-msm@vger.kernel.org, linux-pci@vger.kernel.org, devicetree@vger.kernel.org, linux-phy@lists.infradead.org Subject: Re: [PATCH v5 4/5] PCI: qcom: Add interconnect support to 2.7.0/1.9.0 ops Message-ID: References: <20211218141024.500952-1-dmitry.baryshkov@linaro.org> <20211218141024.500952-5-dmitry.baryshkov@linaro.org> <527f0365-1544-ad73-cf49-b839ae629340@linaro.org> <20220211161208.GB448@lpieralisi> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20220211161208.GB448@lpieralisi> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220222_154531_502136_3AF9C257 X-CRM114-Status: GOOD ( 36.27 ) X-BeenThere: linux-phy@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux Phy Mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-phy" Errors-To: linux-phy-bounces+linux-phy=archiver.kernel.org@lists.infradead.org On Fri 11 Feb 08:12 PST 2022, Lorenzo Pieralisi wrote: > On Fri, Feb 04, 2022 at 05:38:33PM +0300, Dmitry Baryshkov wrote: > > On 03/02/2022 18:57, Bjorn Andersson wrote: > > > On Sat 18 Dec 06:10 PST 2021, Dmitry Baryshkov wrote: > > > > > > > Add optional interconnect support for the 2.7.0/1.9.0 hosts. Set the > > > > bandwidth according to the values from the downstream driver. > > > > > > > > > > What memory transactions will travel this path? I would expect there to > > > be two different paths involved, given the rather low bw numbers I > > > presume this is the config path? > > > > I think so. Downstream votes on this path for most of the known SoCs. Two > > spotted omissions are ipq8074 and qcs404. > > > > > > > > Is there no vote for the data path? > > > > CNSS devices can vote additionally on the MASTER_PCI to memory paths: > > For sm845 (45 = MASTER_PCIE): > > qcom,msm-bus,vectors-KBps = > > <45 512 0 0>, > > <45 512 600000 800000>; /* ~4.6Gbps (MCS12) */ > > > > On sm8150/sm8250 qca bindings do not contain a vote, but wil6210 does (100 = > > MASTER_PCIE_1): > > qcom,msm-bus,vectors-KBps = > > <100 512 0 0>, > > <100 512 600000 800000>; /* ~4.6Gbps (MCS12) */ > > > > For sm8450 there are two paths used by cnss: > > <&pcie_noc MASTER_PCIE_0 &pcie_noc SLAVE_ANOC_PCIE_GEM_NOC>, > > <&gem_noc MASTER_ANOC_PCIE_GEM_NOC &mc_virt SLAVE_EBI1>; > > > > with multiple entries per each path. > > > > So, I'm not sure about these values. > > This discussion is gating the series, please let me know if you want me > to cherry-pick the other patches or you will resend the series. > Please pick the other patches and I'll work with Dmitry to conclude how this is actually connected to the busses inside the SoC. Thanks, Bjorn > Lorenzo > > > > > Signed-off-by: Dmitry Baryshkov > > > > --- > > > > drivers/pci/controller/dwc/pcie-qcom.c | 11 +++++++++++ > > > > 1 file changed, 11 insertions(+) > > > > > > > > diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c > > > > index d8d400423a0a..55ac3caa6d7d 100644 > > > > --- a/drivers/pci/controller/dwc/pcie-qcom.c > > > > +++ b/drivers/pci/controller/dwc/pcie-qcom.c > > > > @@ -12,6 +12,7 @@ > > > > #include > > > > #include > > > > #include > > > > +#include > > > > #include > > > > #include > > > > #include > > > > @@ -167,6 +168,7 @@ struct qcom_pcie_resources_2_7_0 { > > > > struct clk *pipe_clk_src; > > > > struct clk *phy_pipe_clk; > > > > struct clk *ref_clk_src; > > > > + struct icc_path *path; > > > > }; > > > > union qcom_pcie_resources { > > > > @@ -1121,6 +1123,10 @@ static int qcom_pcie_get_resources_2_7_0(struct qcom_pcie *pcie) > > > > if (IS_ERR(res->pci_reset)) > > > > return PTR_ERR(res->pci_reset); > > > > + res->path = devm_of_icc_get(dev, "pci"); > > > > > > The paths are typically identified using a string of the form > > > -. > > > > > > > > > I don't see the related update to the DT binding for the introduction of > > > the interconnect. > > > > > > Regards, > > > Bjorn > > > > > > > + if (IS_ERR(res->path)) > > > > + return PTR_ERR(res->path); > > > > + > > > > res->supplies[0].supply = "vdda"; > > > > res->supplies[1].supply = "vddpe-3v3"; > > > > ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(res->supplies), > > > > @@ -1183,6 +1189,9 @@ static int qcom_pcie_init_2_7_0(struct qcom_pcie *pcie) > > > > if (pcie->cfg->pipe_clk_need_muxing) > > > > clk_set_parent(res->pipe_clk_src, res->phy_pipe_clk); > > > > + if (res->path) > > > > + icc_set_bw(res->path, 500, 800); > > > > + > > > > ret = clk_bulk_prepare_enable(res->num_clks, res->clks); > > > > if (ret < 0) > > > > goto err_disable_regulators; > > > > @@ -1241,6 +1250,8 @@ static void qcom_pcie_deinit_2_7_0(struct qcom_pcie *pcie) > > > > struct qcom_pcie_resources_2_7_0 *res = &pcie->res.v2_7_0; > > > > clk_bulk_disable_unprepare(res->num_clks, res->clks); > > > > + if (res->path) > > > > + icc_set_bw(res->path, 0, 0); > > > > /* Set TCXO as clock source for pcie_pipe_clk_src */ > > > > if (pcie->cfg->pipe_clk_need_muxing) > > > > -- > > > > 2.34.1 > > > > > > > > > > -- > > With best wishes > > Dmitry -- linux-phy mailing list linux-phy@lists.infradead.org https://lists.infradead.org/mailman/listinfo/linux-phy