| Message ID | 1686311249-6857-1-git-send-email-quic_krichai@quicinc.com |
|---|---|
| Headers | show |
| Series | PCI: qcom: ep: Add basic interconnect support | expand |
On 9.06.2023 13:47, Krishna chaitanya chundru wrote: > Some platforms may not boot if a device driver doesn't initialize > the interconnect path. Mostly it is handled by the bootloader but > we have starting to see cases where bootloader simply ignores them. > > Add the "pcie-mem" interconnect path as a required property to the > bindings. > > Signed-off-by: Krishna chaitanya chundru <quic_krichai@quicinc.com> > --- Hi, only patches 1 and 2 made it to both me and linux-arm-msm. Consider using b4 (https://b4.docs.kernel.org/en/latest/index.html) to avoid this. > Documentation/devicetree/bindings/pci/qcom,pcie-ep.yaml | 11 +++++++++++ > 1 file changed, 11 insertions(+) > > diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie-ep.yaml b/Documentation/devicetree/bindings/pci/qcom,pcie-ep.yaml > index b3c22eb..656e362 100644 > --- a/Documentation/devicetree/bindings/pci/qcom,pcie-ep.yaml > +++ b/Documentation/devicetree/bindings/pci/qcom,pcie-ep.yaml > @@ -70,6 +70,13 @@ properties: > description: GPIO used as WAKE# output signal > maxItems: 1 > > + interconnects: > + maxItems: 1 > + > + interconnect-names: > + items: > + - const: pcie-mem > + > resets: > maxItems: 1 > > @@ -97,6 +104,8 @@ required: > - interrupts > - interrupt-names > - reset-gpios > + - interconnects > + - interconnect-names > - resets > - reset-names > - power-domains > @@ -194,6 +203,8 @@ examples: > interrupt-names = "global", "doorbell"; > reset-gpios = <&tlmm 57 GPIO_ACTIVE_LOW>; > wake-gpios = <&tlmm 53 GPIO_ACTIVE_LOW>; > + interconnects = <&system_noc MASTER_PCIE_0 &mc_virt SLAVE_EBI1>; > + interconnect-names = "pci-mem"; The indentation is off and my brain compiler says that it will not compile without including some headers. Konrad > resets = <&gcc GCC_PCIE_BCR>; > reset-names = "core"; > power-domains = <&gcc PCIE_GDSC>;
On Fri, 9 Jun 2023 at 14:47, Krishna chaitanya chundru <quic_krichai@quicinc.com> wrote: > > Add support to vote for ICC bandwidth based on the link speed and width. > > This patch is inspired from pcie-qcom driver to add basic interconnect > support. > > Link: https://lore.kernel.org/all/20221102090705.23634-1-johan+linaro@kernel.org/ This link should be a part of the cover letter, not the commit msg. If you want to refer to the previous commits, please use the standard reference: commit abcdefabc ("PCI: qcom: Make foo and bar"). > Signed-off-by: Krishna chaitanya chundru <quic_krichai@quicinc.com> > --- > drivers/pci/controller/dwc/pcie-qcom-ep.c | 68 +++++++++++++++++++++++++++++++ > 1 file changed, 68 insertions(+) > > diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c > index 19b3283..baf831f 100644 > --- a/drivers/pci/controller/dwc/pcie-qcom-ep.c > +++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c > @@ -13,6 +13,7 @@ > #include <linux/debugfs.h> > #include <linux/delay.h> > #include <linux/gpio/consumer.h> > +#include <linux/interconnect.h> > #include <linux/mfd/syscon.h> > #include <linux/phy/pcie.h> > #include <linux/phy/phy.h> > @@ -28,6 +29,7 @@ > #define PARF_SYS_CTRL 0x00 > #define PARF_DB_CTRL 0x10 > #define PARF_PM_CTRL 0x20 > +#define PARF_PM_STTS 0x24 > #define PARF_MHI_CLOCK_RESET_CTRL 0x174 > #define PARF_MHI_BASE_ADDR_LOWER 0x178 > #define PARF_MHI_BASE_ADDR_UPPER 0x17c > @@ -128,6 +130,9 @@ > /* DBI register fields */ > #define DBI_CON_STATUS_POWER_STATE_MASK GENMASK(1, 0) > > +#define DBI_LINKCTRLSTATUS 0x80 > +#define DBI_LINKCTRLSTATUS_SHIFT 16 > + > #define XMLH_LINK_UP 0x400 > #define CORE_RESET_TIME_US_MIN 1000 > #define CORE_RESET_TIME_US_MAX 1005 > @@ -178,6 +183,8 @@ struct qcom_pcie_ep { > struct phy *phy; > struct dentry *debugfs; > > + struct icc_path *icc_mem; > + > struct clk_bulk_data *clks; > int num_clks; > > @@ -253,9 +260,51 @@ static void qcom_pcie_dw_stop_link(struct dw_pcie *pci) > disable_irq(pcie_ep->perst_irq); > } > > +static void qcom_pcie_ep_icc_update(struct qcom_pcie_ep *pcie_ep) > +{ > + struct dw_pcie *pci = &pcie_ep->pci; > + u32 offset, status, bw; > + int speed, width; > + int ret; > + > + if (!pcie_ep->icc_mem) > + return; > + > + offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP); > + status = readw(pci->dbi_base + offset + PCI_EXP_LNKSTA); > + > + speed = FIELD_GET(PCI_EXP_LNKSTA_CLS, status); > + width = FIELD_GET(PCI_EXP_LNKSTA_NLW, status); > + > + switch (speed) { > + case 1: > + bw = MBps_to_icc(250); /* BW for GEN1 per lane: 250MBps */ Please extract these constants to the defines. This would save you from duplicating 250 below. > + break; > + case 2: > + bw = MBps_to_icc(500); /* BW for GEN2 per lane: 500MBps */ > + break; > + case 3: > + bw = MBps_to_icc(985); /* BW for GEN3 per lane: 985MBps */ > + break; > + default: > + WARN_ON_ONCE(1); > + fallthrough; > + case 4: > + bw = MBps_to_icc(1969); /* BW for GEN4 per lane:1969MBps */ > + break; > + } > + > + ret = icc_set_bw(pcie_ep->icc_mem, 0, width * bw); > + if (ret) { > + dev_err(pci->dev, "failed to set interconnect bandwidth: %d\n", > + ret); > + } > +} > + > static int qcom_pcie_enable_resources(struct qcom_pcie_ep *pcie_ep) > { > int ret; > + struct dw_pcie *pci = &pcie_ep->pci; > > ret = clk_bulk_prepare_enable(pcie_ep->num_clks, pcie_ep->clks); > if (ret) > @@ -277,6 +326,20 @@ static int qcom_pcie_enable_resources(struct qcom_pcie_ep *pcie_ep) > if (ret) > goto err_phy_exit; > > + /* > + * Some Qualcomm platforms require interconnect bandwidth constraints > + * to be set before enabling interconnect clocks. > + * > + * Set an initial average bandwidth corresponding to GEN1x1(250 MBps) > + * for the pcie to mem path. > + */ > + ret = icc_set_bw(pcie_ep->icc_mem, 0, MBps_to_icc(250)); > + if (ret) { > + dev_err(pci->dev, "failed to set interconnect bandwidth: %d\n", > + ret); > + goto err_phy_exit; > + } > + > return 0; > > err_phy_exit: > @@ -550,6 +613,10 @@ static int qcom_pcie_ep_get_resources(struct platform_device *pdev, > if (IS_ERR(pcie_ep->phy)) > ret = PTR_ERR(pcie_ep->phy); > > + pcie_ep->icc_mem = devm_of_icc_get(dev, "pcie-mem"); > + if (IS_ERR(pcie_ep->icc_mem)) > + ret = PTR_ERR(pcie_ep->icc_mem); > + > return ret; > } > > @@ -572,6 +639,7 @@ static irqreturn_t qcom_pcie_ep_global_irq_thread(int irq, void *data) > } else if (FIELD_GET(PARF_INT_ALL_BME, status)) { > dev_dbg(dev, "Received BME event. Link is enabled!\n"); > pcie_ep->link_status = QCOM_PCIE_EP_LINK_ENABLED; > + qcom_pcie_ep_icc_update(pcie_ep); > } else if (FIELD_GET(PARF_INT_ALL_PM_TURNOFF, status)) { > dev_dbg(dev, "Received PM Turn-off event! Entering L23\n"); > val = readl_relaxed(pcie_ep->parf + PARF_PM_CTRL); > -- > 2.7.4 >
On 6/9/2023 9:56 PM, Dmitry Baryshkov wrote: > On Fri, 9 Jun 2023 at 14:47, Krishna chaitanya chundru > <quic_krichai@quicinc.com> wrote: >> Add support to vote for ICC bandwidth based on the link speed and width. >> >> This patch is inspired from pcie-qcom driver to add basic interconnect >> support. >> >> Link: https://lore.kernel.org/all/20221102090705.23634-1-johan+linaro@kernel.org/ > This link should be a part of the cover letter, not the commit msg. If > you want to refer to the previous commits, please use the standard > reference: commit abcdefabc ("PCI: qcom: Make foo and bar"). done >> Signed-off-by: Krishna chaitanya chundru <quic_krichai@quicinc.com> >> --- >> drivers/pci/controller/dwc/pcie-qcom-ep.c | 68 +++++++++++++++++++++++++++++++ >> 1 file changed, 68 insertions(+) >> >> diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c >> index 19b3283..baf831f 100644 >> --- a/drivers/pci/controller/dwc/pcie-qcom-ep.c >> +++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c >> @@ -13,6 +13,7 @@ >> #include <linux/debugfs.h> >> #include <linux/delay.h> >> #include <linux/gpio/consumer.h> >> +#include <linux/interconnect.h> >> #include <linux/mfd/syscon.h> >> #include <linux/phy/pcie.h> >> #include <linux/phy/phy.h> >> @@ -28,6 +29,7 @@ >> #define PARF_SYS_CTRL 0x00 >> #define PARF_DB_CTRL 0x10 >> #define PARF_PM_CTRL 0x20 >> +#define PARF_PM_STTS 0x24 >> #define PARF_MHI_CLOCK_RESET_CTRL 0x174 >> #define PARF_MHI_BASE_ADDR_LOWER 0x178 >> #define PARF_MHI_BASE_ADDR_UPPER 0x17c >> @@ -128,6 +130,9 @@ >> /* DBI register fields */ >> #define DBI_CON_STATUS_POWER_STATE_MASK GENMASK(1, 0) >> >> +#define DBI_LINKCTRLSTATUS 0x80 >> +#define DBI_LINKCTRLSTATUS_SHIFT 16 >> + >> #define XMLH_LINK_UP 0x400 >> #define CORE_RESET_TIME_US_MIN 1000 >> #define CORE_RESET_TIME_US_MAX 1005 >> @@ -178,6 +183,8 @@ struct qcom_pcie_ep { >> struct phy *phy; >> struct dentry *debugfs; >> >> + struct icc_path *icc_mem; >> + >> struct clk_bulk_data *clks; >> int num_clks; >> >> @@ -253,9 +260,51 @@ static void qcom_pcie_dw_stop_link(struct dw_pcie *pci) >> disable_irq(pcie_ep->perst_irq); >> } >> >> +static void qcom_pcie_ep_icc_update(struct qcom_pcie_ep *pcie_ep) >> +{ >> + struct dw_pcie *pci = &pcie_ep->pci; >> + u32 offset, status, bw; >> + int speed, width; >> + int ret; >> + >> + if (!pcie_ep->icc_mem) >> + return; >> + >> + offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP); >> + status = readw(pci->dbi_base + offset + PCI_EXP_LNKSTA); >> + >> + speed = FIELD_GET(PCI_EXP_LNKSTA_CLS, status); >> + width = FIELD_GET(PCI_EXP_LNKSTA_NLW, status); >> + >> + switch (speed) { >> + case 1: >> + bw = MBps_to_icc(250); /* BW for GEN1 per lane: 250MBps */ > Please extract these constants to the defines. This would save you > from duplicating 250 below. done >> + break; >> + case 2: >> + bw = MBps_to_icc(500); /* BW for GEN2 per lane: 500MBps */ >> + break; >> + case 3: >> + bw = MBps_to_icc(985); /* BW for GEN3 per lane: 985MBps */ >> + break; >> + default: >> + WARN_ON_ONCE(1); >> + fallthrough; >> + case 4: >> + bw = MBps_to_icc(1969); /* BW for GEN4 per lane:1969MBps */ >> + break; >> + } >> + >> + ret = icc_set_bw(pcie_ep->icc_mem, 0, width * bw); >> + if (ret) { >> + dev_err(pci->dev, "failed to set interconnect bandwidth: %d\n", >> + ret); >> + } >> +} >> + >> static int qcom_pcie_enable_resources(struct qcom_pcie_ep *pcie_ep) >> { >> int ret; >> + struct dw_pcie *pci = &pcie_ep->pci; >> >> ret = clk_bulk_prepare_enable(pcie_ep->num_clks, pcie_ep->clks); >> if (ret) >> @@ -277,6 +326,20 @@ static int qcom_pcie_enable_resources(struct qcom_pcie_ep *pcie_ep) >> if (ret) >> goto err_phy_exit; >> >> + /* >> + * Some Qualcomm platforms require interconnect bandwidth constraints >> + * to be set before enabling interconnect clocks. >> + * >> + * Set an initial average bandwidth corresponding to GEN1x1(250 MBps) >> + * for the pcie to mem path. >> + */ >> + ret = icc_set_bw(pcie_ep->icc_mem, 0, MBps_to_icc(250)); >> + if (ret) { >> + dev_err(pci->dev, "failed to set interconnect bandwidth: %d\n", >> + ret); >> + goto err_phy_exit; >> + } >> + >> return 0; >> >> err_phy_exit: >> @@ -550,6 +613,10 @@ static int qcom_pcie_ep_get_resources(struct platform_device *pdev, >> if (IS_ERR(pcie_ep->phy)) >> ret = PTR_ERR(pcie_ep->phy); >> >> + pcie_ep->icc_mem = devm_of_icc_get(dev, "pcie-mem"); >> + if (IS_ERR(pcie_ep->icc_mem)) >> + ret = PTR_ERR(pcie_ep->icc_mem); >> + >> return ret; >> } >> >> @@ -572,6 +639,7 @@ static irqreturn_t qcom_pcie_ep_global_irq_thread(int irq, void *data) >> } else if (FIELD_GET(PARF_INT_ALL_BME, status)) { >> dev_dbg(dev, "Received BME event. Link is enabled!\n"); >> pcie_ep->link_status = QCOM_PCIE_EP_LINK_ENABLED; >> + qcom_pcie_ep_icc_update(pcie_ep); >> } else if (FIELD_GET(PARF_INT_ALL_PM_TURNOFF, status)) { >> dev_dbg(dev, "Received PM Turn-off event! Entering L23\n"); >> val = readl_relaxed(pcie_ep->parf + PARF_PM_CTRL); >> -- >> 2.7.4 >> >