diff options
| author | Shashank Babu Chinta Venkata <quic_schintav@quicinc.com> | 2024-09-11 20:56:29 +0530 |
|---|---|---|
| committer | Krzysztof Wilczyński <kwilczynski@kernel.org> | 2024-09-13 14:44:59 +0000 |
| commit | d14bc28af34fb8b599c1cc4ce24a2833e60ade8f (patch) | |
| tree | 78543645ae3f551c8e39fad8b9ea9e74fc67947b /drivers/pci/controller/dwc/pcie-designware.h | |
| parent | d45736b5984954da71292d858f277bac9c70cd2e (diff) | |
PCI: qcom: Add RX lane margining settings for 16.0 GT/s
Add RX lane margining settings for 16.0 GT/s (GEN 4) data rate.
These settings improve link stability while operating at high date
rates and helps to improve signal quality.
Link: https://lore.kernel.org/linux-pci/20240911-pci-qcom-gen4-stability-v7-4-743f5c1fd027@linaro.org
Tested-by: Johan Hovold <johan+linaro@kernel.org>
Signed-off-by: Shashank Babu Chinta Venkata <quic_schintav@quicinc.com>
[mani: dropped the code refactoring and minor changes]
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
[kwilczynski: commit log]
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Reviewed-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Diffstat (limited to 'drivers/pci/controller/dwc/pcie-designware.h')
| -rw-r--r-- | drivers/pci/controller/dwc/pcie-designware.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h index 67cc2677ab2e..347ab74ac35a 100644 --- a/drivers/pci/controller/dwc/pcie-designware.h +++ b/drivers/pci/controller/dwc/pcie-designware.h @@ -211,6 +211,24 @@ #define PCIE_PL_CHK_REG_ERR_ADDR 0xB28 /* + * 16.0 GT/s (Gen 4) lane margining register definitions + */ +#define GEN4_LANE_MARGINING_1_OFF 0xB80 +#define MARGINING_MAX_VOLTAGE_OFFSET GENMASK(29, 24) +#define MARGINING_NUM_VOLTAGE_STEPS GENMASK(22, 16) +#define MARGINING_MAX_TIMING_OFFSET GENMASK(13, 8) +#define MARGINING_NUM_TIMING_STEPS GENMASK(5, 0) + +#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 GENMASK(20, 16) +#define MARGINING_SAMPLE_RATE_TIMING GENMASK(13, 8) +#define MARGINING_SAMPLE_RATE_VOLTAGE GENMASK(5, 0) +/* * iATU Unroll-specific register definitions * From 4.80 core version the address translation will be made by unroll */ |