| Message ID | 1687827692-6181-4-git-send-email-quic_krichai@quicinc.com (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Lorenzo Pieralisi |
| Headers | show |
| Series | PCI: qcom: ep: Add basic interconnect support | expand |
On Tue, Jun 27, 2023 at 06:31:31AM +0530, Krishna chaitanya chundru wrote: > +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; > + Is this check needed? interconnect is added as required property and probe is failed if interconnect get fails. qcom_pcie_enable_resources() which gets called before enabling this interrupt is assuming that interconnect available. > + 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(PCIE_GEN1_BW_MBPS); > + break; > + case 2: > + bw = MBps_to_icc(PCIE_GEN2_BW_MBPS); > + break; > + case 3: > + bw = MBps_to_icc(PCIE_GEN3_BW_MBPS); > + break; > + default: > + dev_warn(pci->dev, "using default GEN4 bandwidth\n"); > + fallthrough; > + case 4: > + bw = MBps_to_icc(PCIE_GEN4_BW_MBPS); > + 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); > + } Are you not seeing the below warning from checkpatch? WARNING: braces {} are not necessary for single statement blocks > +} > + > 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 +331,20 @@ 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 peak bandwidth corresponding to single-lane Gen 1 > + * for the pcie-mem path. > + */ > + ret = icc_set_bw(pcie_ep->icc_mem, 0, MBps_to_icc(PCIE_GEN1_BW_MBPS)); > + if (ret) { > + dev_err(pci->dev, "failed to set interconnect bandwidth: %d\n", > + ret); > + goto err_phy_exit; > + } > + > return 0; Thanks, Pavan
On Tue, Jun 27, 2023 at 06:31:31AM +0530, Krishna chaitanya chundru 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. > > Reference: commit c4860af88d0c ("PCI: qcom: Add basic interconnect > support"). > Signed-off-by: Krishna chaitanya chundru <quic_krichai@quicinc.com> > --- > drivers/pci/controller/dwc/pcie-qcom-ep.c | 73 +++++++++++++++++++++++++++++++ > 1 file changed, 73 insertions(+) > > diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c > index 1435f51..b613817 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 > @@ -128,11 +130,19 @@ > /* DBI register fields */ > #define DBI_CON_STATUS_POWER_STATE_MASK GENMASK(1, 0) > > +#define DBI_LINKCTRLSTATUS 0x80 > +#define DBI_LINKCTRLSTATUS_SHIFT 16 not used? > + > #define XMLH_LINK_UP 0x400 > #define CORE_RESET_TIME_US_MIN 1000 > #define CORE_RESET_TIME_US_MAX 1005 > #define WAKE_DELAY_US 2000 /* 2 ms */ > > +#define PCIE_GEN1_BW_MBPS 250 > +#define PCIE_GEN2_BW_MBPS 500 > +#define PCIE_GEN3_BW_MBPS 985 > +#define PCIE_GEN4_BW_MBPS 1969 > + > #define to_pcie_ep(x) dev_get_drvdata((x)->dev) > > enum qcom_pcie_ep_link_status { > @@ -178,6 +188,8 @@ 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 +265,51 @@ 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(PCIE_GEN1_BW_MBPS); > + break; > + case 2: > + bw = MBps_to_icc(PCIE_GEN2_BW_MBPS); > + break; > + case 3: > + bw = MBps_to_icc(PCIE_GEN3_BW_MBPS); > + break; > + default: > + dev_warn(pci->dev, "using default GEN4 bandwidth\n"); > + fallthrough; > + case 4: > + bw = MBps_to_icc(PCIE_GEN4_BW_MBPS); > + 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); No need of braces for single line. > + } > +} > + > 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 +331,20 @@ 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 peak bandwidth corresponding to single-lane Gen 1 > + * for the pcie-mem path. > + */ > + ret = icc_set_bw(pcie_ep->icc_mem, 0, MBps_to_icc(PCIE_GEN1_BW_MBPS)); > + if (ret) { > + dev_err(pci->dev, "failed to set interconnect bandwidth: %d\n", > + ret); > + goto err_phy_exit; Again, you should power off the PHY in the case of error. err_phy_exit is not doing that for you. - Mani > + } > + > return 0; > > err_phy_exit: > @@ -550,6 +618,10 @@ 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; > } > > @@ -573,6 +645,7 @@ 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); > pci_epc_bme_notify(pci->ep.epc); > } else if (FIELD_GET(PARF_INT_ALL_PM_TURNOFF, status)) { > dev_dbg(dev, "Received PM Turn-off event! Entering L23\n"); > -- > 2.7.4 >
On Tue, Jun 27, 2023 at 12:05:23PM +0530, Pavan Kondeti wrote: > On Tue, Jun 27, 2023 at 06:31:31AM +0530, Krishna chaitanya chundru wrote: > > +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; > > + > > Is this check needed? interconnect is added as required property and > probe is failed if interconnect get fails. qcom_pcie_enable_resources() > which gets called before enabling this interrupt is assuming that > interconnect available. > Even though the current binding requires interconnect, driver needs to be backwards compatible with old dts where there was no interconnect. Also, devm_of_icc_get() will return NULL if the property is missing in dts. But we are just checking for IS_ERR not IS_ERR_OR_NULL. So this check is required. - Mani > > > + 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(PCIE_GEN1_BW_MBPS); > > + break; > > + case 2: > > + bw = MBps_to_icc(PCIE_GEN2_BW_MBPS); > > + break; > > + case 3: > > + bw = MBps_to_icc(PCIE_GEN3_BW_MBPS); > > + break; > > + default: > > + dev_warn(pci->dev, "using default GEN4 bandwidth\n"); > > + fallthrough; > > + case 4: > > + bw = MBps_to_icc(PCIE_GEN4_BW_MBPS); > > + 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); > > + } > > Are you not seeing the below warning from checkpatch? > > WARNING: braces {} are not necessary for single statement blocks > > > +} > > + > > 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 +331,20 @@ 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 peak bandwidth corresponding to single-lane Gen 1 > > + * for the pcie-mem path. > > + */ > > + ret = icc_set_bw(pcie_ep->icc_mem, 0, MBps_to_icc(PCIE_GEN1_BW_MBPS)); > > + if (ret) { > > + dev_err(pci->dev, "failed to set interconnect bandwidth: %d\n", > > + ret); > > + goto err_phy_exit; > > + } > > + > > return 0; > > Thanks, > Pavan
On 6/27/2023 12:05 PM, Pavan Kondeti wrote: > On Tue, Jun 27, 2023 at 06:31:31AM +0530, Krishna chaitanya chundru wrote: >> +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; >> + > Is this check needed? interconnect is added as required property and > probe is failed if interconnect get fails. qcom_pcie_enable_resources() > which gets called before enabling this interrupt is assuming that > interconnect available. > > >> + 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(PCIE_GEN1_BW_MBPS); >> + break; >> + case 2: >> + bw = MBps_to_icc(PCIE_GEN2_BW_MBPS); >> + break; >> + case 3: >> + bw = MBps_to_icc(PCIE_GEN3_BW_MBPS); >> + break; >> + default: >> + dev_warn(pci->dev, "using default GEN4 bandwidth\n"); >> + fallthrough; >> + case 4: >> + bw = MBps_to_icc(PCIE_GEN4_BW_MBPS); >> + 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); >> + } > Are you not seeing the below warning from checkpatch? > > WARNING: braces {} are not necessary for single statement blocks checkpatch is not giving warnings for this. I removed the braces. -KC >> +} >> + >> 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 +331,20 @@ 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 peak bandwidth corresponding to single-lane Gen 1 >> + * for the pcie-mem path. >> + */ >> + ret = icc_set_bw(pcie_ep->icc_mem, 0, MBps_to_icc(PCIE_GEN1_BW_MBPS)); >> + if (ret) { >> + dev_err(pci->dev, "failed to set interconnect bandwidth: %d\n", >> + ret); >> + goto err_phy_exit; >> + } >> + >> return 0; > Thanks, > Pavan
On 6/27/2023 8:31 PM, Manivannan Sadhasivam wrote: > On Tue, Jun 27, 2023 at 06:31:31AM +0530, Krishna chaitanya chundru 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. >> >> Reference: commit c4860af88d0c ("PCI: qcom: Add basic interconnect >> support"). >> Signed-off-by: Krishna chaitanya chundru <quic_krichai@quicinc.com> >> --- >> drivers/pci/controller/dwc/pcie-qcom-ep.c | 73 +++++++++++++++++++++++++++++++ >> 1 file changed, 73 insertions(+) >> >> diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c >> index 1435f51..b613817 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 >> @@ -128,11 +130,19 @@ >> /* DBI register fields */ >> #define DBI_CON_STATUS_POWER_STATE_MASK GENMASK(1, 0) >> >> +#define DBI_LINKCTRLSTATUS 0x80 >> +#define DBI_LINKCTRLSTATUS_SHIFT 16 > not used? not using these macros so I removed them in next patch. >> + >> #define XMLH_LINK_UP 0x400 >> #define CORE_RESET_TIME_US_MIN 1000 >> #define CORE_RESET_TIME_US_MAX 1005 >> #define WAKE_DELAY_US 2000 /* 2 ms */ >> >> +#define PCIE_GEN1_BW_MBPS 250 >> +#define PCIE_GEN2_BW_MBPS 500 >> +#define PCIE_GEN3_BW_MBPS 985 >> +#define PCIE_GEN4_BW_MBPS 1969 >> + >> #define to_pcie_ep(x) dev_get_drvdata((x)->dev) >> >> enum qcom_pcie_ep_link_status { >> @@ -178,6 +188,8 @@ 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 +265,51 @@ 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(PCIE_GEN1_BW_MBPS); >> + break; >> + case 2: >> + bw = MBps_to_icc(PCIE_GEN2_BW_MBPS); >> + break; >> + case 3: >> + bw = MBps_to_icc(PCIE_GEN3_BW_MBPS); >> + break; >> + default: >> + dev_warn(pci->dev, "using default GEN4 bandwidth\n"); >> + fallthrough; >> + case 4: >> + bw = MBps_to_icc(PCIE_GEN4_BW_MBPS); >> + 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); > No need of braces for single line. done. >> + } >> +} >> + >> 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 +331,20 @@ 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 peak bandwidth corresponding to single-lane Gen 1 >> + * for the pcie-mem path. >> + */ >> + ret = icc_set_bw(pcie_ep->icc_mem, 0, MBps_to_icc(PCIE_GEN1_BW_MBPS)); >> + if (ret) { >> + dev_err(pci->dev, "failed to set interconnect bandwidth: %d\n", >> + ret); >> + goto err_phy_exit; > Again, you should power off the PHY in the case of error. err_phy_exit is not > doing that for you. > > - Mani added the code remove the phy power. -KC >> + } >> + >> return 0; >> >> err_phy_exit: >> @@ -550,6 +618,10 @@ 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; >> } >> >> @@ -573,6 +645,7 @@ 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); >> pci_epc_bme_notify(pci->ep.epc); >> } else if (FIELD_GET(PARF_INT_ALL_PM_TURNOFF, status)) { >> dev_dbg(dev, "Received PM Turn-off event! Entering L23\n"); >> -- >> 2.7.4 >>
diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c index 1435f51..b613817 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 @@ -128,11 +130,19 @@ /* 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 #define WAKE_DELAY_US 2000 /* 2 ms */ +#define PCIE_GEN1_BW_MBPS 250 +#define PCIE_GEN2_BW_MBPS 500 +#define PCIE_GEN3_BW_MBPS 985 +#define PCIE_GEN4_BW_MBPS 1969 + #define to_pcie_ep(x) dev_get_drvdata((x)->dev) enum qcom_pcie_ep_link_status { @@ -178,6 +188,8 @@ 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 +265,51 @@ 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(PCIE_GEN1_BW_MBPS); + break; + case 2: + bw = MBps_to_icc(PCIE_GEN2_BW_MBPS); + break; + case 3: + bw = MBps_to_icc(PCIE_GEN3_BW_MBPS); + break; + default: + dev_warn(pci->dev, "using default GEN4 bandwidth\n"); + fallthrough; + case 4: + bw = MBps_to_icc(PCIE_GEN4_BW_MBPS); + 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 +331,20 @@ 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 peak bandwidth corresponding to single-lane Gen 1 + * for the pcie-mem path. + */ + ret = icc_set_bw(pcie_ep->icc_mem, 0, MBps_to_icc(PCIE_GEN1_BW_MBPS)); + 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 +618,10 @@ 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; } @@ -573,6 +645,7 @@ 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); pci_epc_bme_notify(pci->ep.epc); } else if (FIELD_GET(PARF_INT_ALL_PM_TURNOFF, status)) { dev_dbg(dev, "Received PM Turn-off event! Entering L23\n");
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. Reference: commit c4860af88d0c ("PCI: qcom: Add basic interconnect support"). Signed-off-by: Krishna chaitanya chundru <quic_krichai@quicinc.com> --- drivers/pci/controller/dwc/pcie-qcom-ep.c | 73 +++++++++++++++++++++++++++++++ 1 file changed, 73 insertions(+)