| Message ID | 20240320071527.13443-4-quic_schintav@quicinc.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | Add Gen4 equalization and margining settings | expand |
On 20.03.2024 08:14, Shashank Babu Chinta Venkata wrote: > Add rx margining settings for gen4 operation. Why are these necessary? What do they change? > > Signed-off-by: Shashank Babu Chinta Venkata <quic_schintav@quicinc.com> > --- > drivers/pci/controller/dwc/pcie-designware.h | 23 +++++++++++++ > drivers/pci/controller/dwc/pcie-qcom-cmn.c | 35 ++++++++++++++++++++ > drivers/pci/controller/dwc/pcie-qcom-cmn.h | 11 +++++- > drivers/pci/controller/dwc/pcie-qcom-ep.c | 4 ++- > drivers/pci/controller/dwc/pcie-qcom.c | 4 ++- > 5 files changed, 74 insertions(+), 3 deletions(-) > > diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h > index 064744bfe35a..ce1c5f9c406a 100644 > --- a/drivers/pci/controller/dwc/pcie-designware.h > +++ b/drivers/pci/controller/dwc/pcie-designware.h > @@ -206,6 +206,29 @@ > > #define PCIE_PL_CHK_REG_ERR_ADDR 0xB28 > > +/* > + * GEN4 lane margining register definitions > + */ > +#define GEN4_LANE_MARGINING_1_OFF 0xb80 > +#define MARGINING_MAX_VOLTAGE_OFFSET_MASK GENMASK(29, 24) > +#define MARGINING_NUM_VOLTAGE_STEPS_MASK GENMASK(22, 16) > +#define MARGINING_MAX_TIMING_OFFSET_MASK GENMASK(13, 8) > +#define MARGINING_NUM_TIMING_STEPS_MASK GENMASK(5, 0) > +#define MARGINING_MAX_VOLTAGE_OFFSET_SHIFT 24 > +#define MARGINING_NUM_VOLTAGE_STEPS_SHIFT 16 > +#define MARGINING_MAX_TIMING_OFFSET_SHIFT 8 > + > +#define GEN4_LANE_MARGINING_2_OFF 0xb84 The file drivers/accel/habanalabs/include/gaudi2/asic_reg/pcie_dbi_regs.h defines registers with exactly the same names at exacly the same offsets. If this is a DWC-common thing, it should go to DWC-common code. Konrad
On Wed, Mar 20, 2024 at 12:14:47AM -0700, Shashank Babu Chinta Venkata wrote: > Add rx margining settings for gen4 operation. > What is 'rx margining'? As mentioned in the previous patch, use 16 GT/s. > Signed-off-by: Shashank Babu Chinta Venkata <quic_schintav@quicinc.com> > --- > drivers/pci/controller/dwc/pcie-designware.h | 23 +++++++++++++ > drivers/pci/controller/dwc/pcie-qcom-cmn.c | 35 ++++++++++++++++++++ > drivers/pci/controller/dwc/pcie-qcom-cmn.h | 11 +++++- > drivers/pci/controller/dwc/pcie-qcom-ep.c | 4 ++- > drivers/pci/controller/dwc/pcie-qcom.c | 4 ++- > 5 files changed, 74 insertions(+), 3 deletions(-) > > diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h > index 064744bfe35a..ce1c5f9c406a 100644 > --- a/drivers/pci/controller/dwc/pcie-designware.h > +++ b/drivers/pci/controller/dwc/pcie-designware.h > @@ -206,6 +206,29 @@ > > #define PCIE_PL_CHK_REG_ERR_ADDR 0xB28 > > +/* > + * GEN4 lane margining register definitions > + */ > +#define GEN4_LANE_MARGINING_1_OFF 0xb80 > +#define MARGINING_MAX_VOLTAGE_OFFSET_MASK GENMASK(29, 24) > +#define MARGINING_NUM_VOLTAGE_STEPS_MASK GENMASK(22, 16) > +#define MARGINING_MAX_TIMING_OFFSET_MASK GENMASK(13, 8) > +#define MARGINING_NUM_TIMING_STEPS_MASK GENMASK(5, 0) > +#define MARGINING_MAX_VOLTAGE_OFFSET_SHIFT 24 > +#define MARGINING_NUM_VOLTAGE_STEPS_SHIFT 16 > +#define MARGINING_MAX_TIMING_OFFSET_SHIFT 8 > + > +#define GEN4_LANE_MARGINING_2_OFF 0xb84 > +#define MARGINING_IND_ERROR_SAMPLER BIT(28) > +#define MARGINING_SAMPLE_REPORTING_METHOD BIT(27) > +#define MARGINING_IND_LEFT_RIGHT_TIMING BIT(26) > +#define MARGINING_IND_UP_DOWN_VOLTAGE BIT(25) > +#define MARGINING_VOLTAGE_SUPPORTED BIT(24) > +#define MARGINING_MAXLANES_MASK GENMASK(20, 16) > +#define MARGINING_SAMPLE_RATE_TIMING_MASK GENMASK(13, 8) > +#define MARGINING_SAMPLE_RATE_VOLTAGE_MASK GENMASK(5, 0) > +#define MARGINING_MAXLANES_SHIFT 16 > +#define MARGINING_SAMPLE_RATE_TIMING_SHIFT 8 Add a newline > /* > * iATU Unroll-specific register definitions > * From 4.80 core version the address translation will be made by unroll > diff --git a/drivers/pci/controller/dwc/pcie-qcom-cmn.c b/drivers/pci/controller/dwc/pcie-qcom-cmn.c > index 208a55e8e9a1..bf6b27ee8327 100644 > --- a/drivers/pci/controller/dwc/pcie-qcom-cmn.c > +++ b/drivers/pci/controller/dwc/pcie-qcom-cmn.c > @@ -53,6 +53,41 @@ void qcom_pcie_cmn_set_16gt_eq_settings(struct dw_pcie *pci) > } > EXPORT_SYMBOL_GPL(qcom_pcie_cmn_set_16gt_eq_settings); > > +void qcom_pcie_cmn_set_16gt_rx_margining_settings(struct dw_pcie *pci) > +{ > + u32 reg; > + > + reg = dw_pcie_readl_dbi(pci, GEN4_LANE_MARGINING_1_OFF); > + reg &= ~MARGINING_MAX_VOLTAGE_OFFSET_MASK; > + reg |= (MARGINING_MAX_VOLTAGE_OFFSET_VAL << > + MARGINING_MAX_VOLTAGE_OFFSET_SHIFT); Same comment as previous patch to use FIELD_* macros. - Mani
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h index 064744bfe35a..ce1c5f9c406a 100644 --- a/drivers/pci/controller/dwc/pcie-designware.h +++ b/drivers/pci/controller/dwc/pcie-designware.h @@ -206,6 +206,29 @@ #define PCIE_PL_CHK_REG_ERR_ADDR 0xB28 +/* + * GEN4 lane margining register definitions + */ +#define GEN4_LANE_MARGINING_1_OFF 0xb80 +#define MARGINING_MAX_VOLTAGE_OFFSET_MASK GENMASK(29, 24) +#define MARGINING_NUM_VOLTAGE_STEPS_MASK GENMASK(22, 16) +#define MARGINING_MAX_TIMING_OFFSET_MASK GENMASK(13, 8) +#define MARGINING_NUM_TIMING_STEPS_MASK GENMASK(5, 0) +#define MARGINING_MAX_VOLTAGE_OFFSET_SHIFT 24 +#define MARGINING_NUM_VOLTAGE_STEPS_SHIFT 16 +#define MARGINING_MAX_TIMING_OFFSET_SHIFT 8 + +#define GEN4_LANE_MARGINING_2_OFF 0xb84 +#define MARGINING_IND_ERROR_SAMPLER BIT(28) +#define MARGINING_SAMPLE_REPORTING_METHOD BIT(27) +#define MARGINING_IND_LEFT_RIGHT_TIMING BIT(26) +#define MARGINING_IND_UP_DOWN_VOLTAGE BIT(25) +#define MARGINING_VOLTAGE_SUPPORTED BIT(24) +#define MARGINING_MAXLANES_MASK GENMASK(20, 16) +#define MARGINING_SAMPLE_RATE_TIMING_MASK GENMASK(13, 8) +#define MARGINING_SAMPLE_RATE_VOLTAGE_MASK GENMASK(5, 0) +#define MARGINING_MAXLANES_SHIFT 16 +#define MARGINING_SAMPLE_RATE_TIMING_SHIFT 8 /* * iATU Unroll-specific register definitions * From 4.80 core version the address translation will be made by unroll diff --git a/drivers/pci/controller/dwc/pcie-qcom-cmn.c b/drivers/pci/controller/dwc/pcie-qcom-cmn.c index 208a55e8e9a1..bf6b27ee8327 100644 --- a/drivers/pci/controller/dwc/pcie-qcom-cmn.c +++ b/drivers/pci/controller/dwc/pcie-qcom-cmn.c @@ -53,6 +53,41 @@ void qcom_pcie_cmn_set_16gt_eq_settings(struct dw_pcie *pci) } EXPORT_SYMBOL_GPL(qcom_pcie_cmn_set_16gt_eq_settings); +void qcom_pcie_cmn_set_16gt_rx_margining_settings(struct dw_pcie *pci) +{ + u32 reg; + + reg = dw_pcie_readl_dbi(pci, GEN4_LANE_MARGINING_1_OFF); + reg &= ~MARGINING_MAX_VOLTAGE_OFFSET_MASK; + reg |= (MARGINING_MAX_VOLTAGE_OFFSET_VAL << + MARGINING_MAX_VOLTAGE_OFFSET_SHIFT); + reg &= ~MARGINING_NUM_VOLTAGE_STEPS_MASK; + reg |= (MARGINING_NUM_VOLTAGE_STEPS_VAL << + MARGINING_NUM_VOLTAGE_STEPS_SHIFT); + reg &= ~MARGINING_MAX_TIMING_OFFSET_MASK; + reg |= (MARGINING_MAX_TIMING_OFFSET_VAL << + MARGINING_MAX_TIMING_OFFSET_SHIFT); + reg &= ~MARGINING_NUM_TIMING_STEPS_MASK; + reg |= MARGINING_NUM_TIMING_STEPS_VAL; + dw_pcie_writel_dbi(pci, GEN4_LANE_MARGINING_1_OFF, reg); + + reg = dw_pcie_readl_dbi(pci, GEN4_LANE_MARGINING_2_OFF); + reg |= MARGINING_IND_ERROR_SAMPLER; + reg |= MARGINING_SAMPLE_REPORTING_METHOD; + reg |= MARGINING_IND_LEFT_RIGHT_TIMING; + reg |= MARGINING_VOLTAGE_SUPPORTED; + reg &= ~MARGINING_IND_UP_DOWN_VOLTAGE; + reg &= ~MARGINING_MAXLANES_MASK; + reg |= (pci->num_lanes << + MARGINING_MAXLANES_SHIFT); + reg &= ~MARGINING_SAMPLE_RATE_TIMING_MASK; + reg |= (MARGINING_SAMPLE_RATE_TIMING_VAL << + MARGINING_SAMPLE_RATE_TIMING_SHIFT); + reg |= MARGINING_SAMPLE_RATE_VOLTAGE_VAL; + dw_pcie_writel_dbi(pci, GEN4_LANE_MARGINING_2_OFF, reg); +} +EXPORT_SYMBOL_GPL(qcom_pcie_cmn_set_16gt_rx_margining_settings); + int qcom_pcie_cmn_icc_get_resource(struct dw_pcie *pci, struct icc_path *icc_mem) { if (IS_ERR(pci)) diff --git a/drivers/pci/controller/dwc/pcie-qcom-cmn.h b/drivers/pci/controller/dwc/pcie-qcom-cmn.h index 97302e8fafa8..11d6b00372ec 100644 --- a/drivers/pci/controller/dwc/pcie-qcom-cmn.h +++ b/drivers/pci/controller/dwc/pcie-qcom-cmn.h @@ -11,9 +11,18 @@ #define GEN3_EQ_FMDC_MAX_PRE_CUSROR_DELTA_16GT_VAL 0x5 #define GEN3_EQ_FMDC_MAX_POST_CUSROR_DELTA_16GT_VAL 0x5 -#define GEN3_EQ_FMDC_N_EVALS_16GT_VAL 0xD +#define GEN3_EQ_FMDC_N_EVALS_16GT_VAL 0xD + +/* GEN4(16GT/s) RX margining settings */ +#define MARGINING_MAX_VOLTAGE_OFFSET_VAL 0x24 +#define MARGINING_NUM_VOLTAGE_STEPS_VAL 0x78 +#define MARGINING_MAX_TIMING_OFFSET_VAL 0x32 +#define MARGINING_NUM_TIMING_STEPS_VAL 0x10 +#define MARGINING_SAMPLE_RATE_TIMING_VAL 0x3f +#define MARGINING_SAMPLE_RATE_VOLTAGE_VAL 0x3f int qcom_pcie_cmn_icc_get_resource(struct dw_pcie *pci, struct icc_path *icc_mem); int qcom_pcie_cmn_icc_init(struct dw_pcie *pci, struct icc_path *icc_mem); void qcom_pcie_cmn_icc_update(struct dw_pcie *pci, struct icc_path *icc_mem); void qcom_pcie_cmn_set_16gt_eq_settings(struct dw_pcie *pci); +void qcom_pcie_cmn_set_16gt_rx_margining_settings(struct dw_pcie *pci); diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c index b6bcab21bb9f..b4d53f96eb9e 100644 --- a/drivers/pci/controller/dwc/pcie-qcom-ep.c +++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c @@ -438,8 +438,10 @@ static int qcom_pcie_perst_deassert(struct dw_pcie *pci) goto err_disable_resources; } - if (pcie_link_speed[pci->link_gen] == PCIE_SPEED_16_0GT) + if (pcie_link_speed[pci->link_gen] == PCIE_SPEED_16_0GT) { qcom_pcie_cmn_set_16gt_eq_settings(pci); + qcom_pcie_cmn_set_16gt_rx_margining_settings(pci); + } /* * The physical address of the MMIO region which is exposed as the BAR diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c index b0a22a000fa3..3dfb4d165ba5 100644 --- a/drivers/pci/controller/dwc/pcie-qcom.c +++ b/drivers/pci/controller/dwc/pcie-qcom.c @@ -263,8 +263,10 @@ static int qcom_pcie_start_link(struct dw_pcie *pci) { struct qcom_pcie *pcie = to_qcom_pcie(pci); - if (pcie_link_speed[pci->link_gen] == PCIE_SPEED_16_0GT) + if (pcie_link_speed[pci->link_gen] == PCIE_SPEED_16_0GT) { qcom_pcie_cmn_set_16gt_eq_settings(pci); + qcom_pcie_cmn_set_16gt_rx_margining_settings(pci); + } /* Enable Link Training state machine */ if (pcie->cfg->ops->ltssm_enable)
Add rx margining settings for gen4 operation. Signed-off-by: Shashank Babu Chinta Venkata <quic_schintav@quicinc.com> --- drivers/pci/controller/dwc/pcie-designware.h | 23 +++++++++++++ drivers/pci/controller/dwc/pcie-qcom-cmn.c | 35 ++++++++++++++++++++ drivers/pci/controller/dwc/pcie-qcom-cmn.h | 11 +++++- drivers/pci/controller/dwc/pcie-qcom-ep.c | 4 ++- drivers/pci/controller/dwc/pcie-qcom.c | 4 ++- 5 files changed, 74 insertions(+), 3 deletions(-)