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charset="utf-8" Add lane equalization setting for 8.0 GT/s to enhance link stability and aviod AER Correctable Errors reported on some platforms (eg. SA8775P). 8.0 GT/s and 16.0 GT/s require the same equalization setting. This setting is programmed into a group of shadow registers, which can be switched to configure equalization for different speeds by writing 00b, 01b to `RATE_SHADOW_SEL`. Hence program equalization registers in a loop using link speed as index, so that equalization setting can be programmed for both 8.0 GT/s and 16.0 GT/s. Co-developed-by: Qiang Yu Signed-off-by: Qiang Yu Signed-off-by: Ziyue Zhang --- drivers/pci/controller/dwc/pcie-designware.h | 1 - drivers/pci/controller/dwc/pcie-qcom-common.c | 55 +++++++++++-------- drivers/pci/controller/dwc/pcie-qcom-common.h | 2 +- drivers/pci/controller/dwc/pcie-qcom-ep.c | 6 +- drivers/pci/controller/dwc/pcie-qcom.c | 6 +- 5 files changed, 38 insertions(+), 32 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/con= troller/dwc/pcie-designware.h index ce9e18554e42..388306991467 100644 --- a/drivers/pci/controller/dwc/pcie-designware.h +++ b/drivers/pci/controller/dwc/pcie-designware.h @@ -127,7 +127,6 @@ #define GEN3_RELATED_OFF_GEN3_EQ_DISABLE BIT(16) #define GEN3_RELATED_OFF_RATE_SHADOW_SEL_SHIFT 24 #define GEN3_RELATED_OFF_RATE_SHADOW_SEL_MASK GENMASK(25, 24) -#define GEN3_RELATED_OFF_RATE_SHADOW_SEL_16_0GT 0x1 =20 #define GEN3_EQ_CONTROL_OFF 0x8A8 #define GEN3_EQ_CONTROL_OFF_FB_MODE GENMASK(3, 0) diff --git a/drivers/pci/controller/dwc/pcie-qcom-common.c b/drivers/pci/co= ntroller/dwc/pcie-qcom-common.c index 3aad19b56da8..ed466496f077 100644 --- a/drivers/pci/controller/dwc/pcie-qcom-common.c +++ b/drivers/pci/controller/dwc/pcie-qcom-common.c @@ -8,9 +8,11 @@ #include "pcie-designware.h" #include "pcie-qcom-common.h" =20 -void qcom_pcie_common_set_16gt_equalization(struct dw_pcie *pci) +void qcom_pcie_common_set_equalization(struct dw_pcie *pci) { u32 reg; + u16 speed, max_speed =3D PCIE_SPEED_16_0GT; + struct device *dev =3D pci->dev; =20 /* * GEN3_RELATED_OFF register is repurposed to apply equalization @@ -19,32 +21,37 @@ void qcom_pcie_common_set_16gt_equalization(struct dw_p= cie *pci) * determines the data rate for which these equalization settings are * applied. */ - reg =3D dw_pcie_readl_dbi(pci, GEN3_RELATED_OFF); - reg &=3D ~GEN3_RELATED_OFF_GEN3_ZRXDC_NONCOMPL; - reg &=3D ~GEN3_RELATED_OFF_RATE_SHADOW_SEL_MASK; - reg |=3D FIELD_PREP(GEN3_RELATED_OFF_RATE_SHADOW_SEL_MASK, - GEN3_RELATED_OFF_RATE_SHADOW_SEL_16_0GT); - dw_pcie_writel_dbi(pci, GEN3_RELATED_OFF, reg); + if (pcie_link_speed[pci->max_link_speed] < PCIE_SPEED_32_0GT) + max_speed =3D pcie_link_speed[pci->max_link_speed]; =20 - reg =3D dw_pcie_readl_dbi(pci, GEN3_EQ_FB_MODE_DIR_CHANGE_OFF); - reg &=3D ~(GEN3_EQ_FMDC_T_MIN_PHASE23 | - GEN3_EQ_FMDC_N_EVALS | - GEN3_EQ_FMDC_MAX_PRE_CUSROR_DELTA | - GEN3_EQ_FMDC_MAX_POST_CUSROR_DELTA); - reg |=3D FIELD_PREP(GEN3_EQ_FMDC_T_MIN_PHASE23, 0x1) | - FIELD_PREP(GEN3_EQ_FMDC_N_EVALS, 0xd) | - FIELD_PREP(GEN3_EQ_FMDC_MAX_PRE_CUSROR_DELTA, 0x5) | - FIELD_PREP(GEN3_EQ_FMDC_MAX_POST_CUSROR_DELTA, 0x5); - dw_pcie_writel_dbi(pci, GEN3_EQ_FB_MODE_DIR_CHANGE_OFF, reg); + for (speed =3D PCIE_SPEED_8_0GT; speed <=3D max_speed; ++speed) { + reg =3D dw_pcie_readl_dbi(pci, GEN3_RELATED_OFF); + reg &=3D ~GEN3_RELATED_OFF_GEN3_ZRXDC_NONCOMPL; + reg &=3D ~GEN3_RELATED_OFF_RATE_SHADOW_SEL_MASK; + reg |=3D FIELD_PREP(GEN3_RELATED_OFF_RATE_SHADOW_SEL_MASK, + speed - PCIE_SPEED_8_0GT); + dw_pcie_writel_dbi(pci, GEN3_RELATED_OFF, reg); =20 - reg =3D dw_pcie_readl_dbi(pci, GEN3_EQ_CONTROL_OFF); - reg &=3D ~(GEN3_EQ_CONTROL_OFF_FB_MODE | - GEN3_EQ_CONTROL_OFF_PHASE23_EXIT_MODE | - GEN3_EQ_CONTROL_OFF_FOM_INC_INITIAL_EVAL | - GEN3_EQ_CONTROL_OFF_PSET_REQ_VEC); - dw_pcie_writel_dbi(pci, GEN3_EQ_CONTROL_OFF, reg); + reg =3D dw_pcie_readl_dbi(pci, GEN3_EQ_FB_MODE_DIR_CHANGE_OFF); + reg &=3D ~(GEN3_EQ_FMDC_T_MIN_PHASE23 | + GEN3_EQ_FMDC_N_EVALS | + GEN3_EQ_FMDC_MAX_PRE_CUSROR_DELTA | + GEN3_EQ_FMDC_MAX_POST_CUSROR_DELTA); + reg |=3D FIELD_PREP(GEN3_EQ_FMDC_T_MIN_PHASE23, 0x1) | + FIELD_PREP(GEN3_EQ_FMDC_N_EVALS, 0xd) | + FIELD_PREP(GEN3_EQ_FMDC_MAX_PRE_CUSROR_DELTA, 0x5) | + FIELD_PREP(GEN3_EQ_FMDC_MAX_POST_CUSROR_DELTA, 0x5); + dw_pcie_writel_dbi(pci, GEN3_EQ_FB_MODE_DIR_CHANGE_OFF, reg); + + reg =3D dw_pcie_readl_dbi(pci, GEN3_EQ_CONTROL_OFF); + reg &=3D ~(GEN3_EQ_CONTROL_OFF_FB_MODE | + GEN3_EQ_CONTROL_OFF_PHASE23_EXIT_MODE | + GEN3_EQ_CONTROL_OFF_FOM_INC_INITIAL_EVAL | + GEN3_EQ_CONTROL_OFF_PSET_REQ_VEC); + dw_pcie_writel_dbi(pci, GEN3_EQ_CONTROL_OFF, reg); + } } -EXPORT_SYMBOL_GPL(qcom_pcie_common_set_16gt_equalization); +EXPORT_SYMBOL_GPL(qcom_pcie_common_set_equalization); =20 void qcom_pcie_common_set_16gt_lane_margining(struct dw_pcie *pci) { diff --git a/drivers/pci/controller/dwc/pcie-qcom-common.h b/drivers/pci/co= ntroller/dwc/pcie-qcom-common.h index 7d88d29e4766..7f5ca2fd9a72 100644 --- a/drivers/pci/controller/dwc/pcie-qcom-common.h +++ b/drivers/pci/controller/dwc/pcie-qcom-common.h @@ -8,7 +8,7 @@ =20 struct dw_pcie; =20 -void qcom_pcie_common_set_16gt_equalization(struct dw_pcie *pci); +void qcom_pcie_common_set_equalization(struct dw_pcie *pci); void qcom_pcie_common_set_16gt_lane_margining(struct dw_pcie *pci); =20 #endif diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/contro= ller/dwc/pcie-qcom-ep.c index bf7c6ac0f3e3..aaf060bf39d4 100644 --- a/drivers/pci/controller/dwc/pcie-qcom-ep.c +++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c @@ -511,10 +511,10 @@ static int qcom_pcie_perst_deassert(struct dw_pcie *p= ci) goto err_disable_resources; } =20 - if (pcie_link_speed[pci->max_link_speed] =3D=3D PCIE_SPEED_16_0GT) { - qcom_pcie_common_set_16gt_equalization(pci); + qcom_pcie_common_set_equalization(pci); + + if (pcie_link_speed[pci->max_link_speed] =3D=3D PCIE_SPEED_16_0GT) qcom_pcie_common_set_16gt_lane_margining(pci); - } =20 /* * 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/controlle= r/dwc/pcie-qcom.c index c789e3f85655..0fcb17ffd2e9 100644 --- a/drivers/pci/controller/dwc/pcie-qcom.c +++ b/drivers/pci/controller/dwc/pcie-qcom.c @@ -298,10 +298,10 @@ static int qcom_pcie_start_link(struct dw_pcie *pci) { struct qcom_pcie *pcie =3D to_qcom_pcie(pci); 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charset="utf-8" Corrected a typo in the macro name GEN3_EQ_FMDC_MAX_PRE_CURSOR_DELTA and GEN3_EQ_FMDC_MAX_POST_CURSOR_DELTA to ensure consistency and avoid potential issues. Signed-off-by: Ziyue Zhang --- drivers/pci/controller/dwc/pcie-designware.h | 4 ++-- drivers/pci/controller/dwc/pcie-qcom-common.c | 8 ++++---- 2 files changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/con= troller/dwc/pcie-designware.h index 388306991467..80831f99d72d 100644 --- a/drivers/pci/controller/dwc/pcie-designware.h +++ b/drivers/pci/controller/dwc/pcie-designware.h @@ -137,8 +137,8 @@ #define GEN3_EQ_FB_MODE_DIR_CHANGE_OFF 0x8AC #define GEN3_EQ_FMDC_T_MIN_PHASE23 GENMASK(4, 0) #define GEN3_EQ_FMDC_N_EVALS GENMASK(9, 5) -#define GEN3_EQ_FMDC_MAX_PRE_CUSROR_DELTA GENMASK(13, 10) -#define GEN3_EQ_FMDC_MAX_POST_CUSROR_DELTA GENMASK(17, 14) +#define GEN3_EQ_FMDC_MAX_PRE_CURSOR_DELTA GENMASK(13, 10) +#define GEN3_EQ_FMDC_MAX_POST_CURSOR_DELTA GENMASK(17, 14) =20 #define PCIE_PORT_MULTI_LANE_CTRL 0x8C0 #define PORT_MLTI_UPCFG_SUPPORT BIT(7) diff --git a/drivers/pci/controller/dwc/pcie-qcom-common.c b/drivers/pci/co= ntroller/dwc/pcie-qcom-common.c index ed466496f077..86ed86b72d5a 100644 --- a/drivers/pci/controller/dwc/pcie-qcom-common.c +++ b/drivers/pci/controller/dwc/pcie-qcom-common.c @@ -35,12 +35,12 @@ void qcom_pcie_common_set_equalization(struct dw_pcie *= pci) reg =3D dw_pcie_readl_dbi(pci, GEN3_EQ_FB_MODE_DIR_CHANGE_OFF); 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charset="utf-8" Add PCIe lane equalization preset properties with all values set to 5 for 8.0 GT/s and 16.0 GT/s data rates to enhance link stability. Co-developed-by: Qiang Yu Signed-off-by: Qiang Yu Signed-off-by: Ziyue Zhang Reviewed-by: Konrad Dybcio --- arch/arm64/boot/dts/qcom/sa8775p.dtsi | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/arm64/boot/dts/qcom/sa8775p.dtsi b/arch/arm64/boot/dts/qc= om/sa8775p.dtsi index 45f536633f64..16caf1da0708 100644 --- a/arch/arm64/boot/dts/qcom/sa8775p.dtsi +++ b/arch/arm64/boot/dts/qcom/sa8775p.dtsi @@ -7159,6 +7159,9 @@ pcie0: pcie@1c00000 { phys =3D <&pcie0_phy>; phy-names =3D "pciephy"; =20 + eq-presets-8gts =3D /bits/ 16 <0x5555 0x5555>; + eq-presets-16gts =3D /bits/ 8 <0x55 0x55>; + status =3D "disabled"; =20 pcieport0: pcie@0 { @@ -7317,6 +7320,9 @@ pcie1: pcie@1c10000 { phys =3D <&pcie1_phy>; phy-names =3D "pciephy"; =20 + eq-presets-8gts =3D /bits/ 16 <0x5555 0x5555 0x5555 0x5555>; + eq-presets-16gts =3D /bits/ 8 <0x55 0x55 0x55 0x55>; + status =3D "disabled"; =20 pcie@0 { --=20 2.34.1