diff options
| author | Krishna Chaitanya Chundru <krishna.chundru@oss.qualcomm.com> | 2025-03-28 15:58:33 +0530 |
|---|---|---|
| committer | Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> | 2025-04-23 12:50:54 +0530 |
| commit | 09483959e34d2577142ad7c56491c82f50da540d (patch) | |
| tree | 97c92e5f70f51a60e47b137d0f87083fea06542c /drivers/pci/controller/dwc/pcie-designware.h | |
| parent | 178af54a678d08735233e070a9329651e1589587 (diff) | |
PCI: dwc: Add support for configuring lane equalization presets
PCIe equalization presets are predefined settings used to optimize signal
integrity by compensating for signal loss and distortion in high-speed data
transmission.
Based upon the number of lanes and the data rate supported, write the
preset data read from the device tree in to the lane equalization control
registers. These preset values will be used by the controller during the
LTSSM lane equalization procedure.
Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@oss.qualcomm.com>
[mani: reworded the commit message and comments in the driver]
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://patch.msgid.link/20250328-preset_v6-v9-5-22cfa0490518@oss.qualcomm.com
Diffstat (limited to 'drivers/pci/controller/dwc/pcie-designware.h')
| -rw-r--r-- | drivers/pci/controller/dwc/pcie-designware.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h index dda788e3bd24..7add69f13759 100644 --- a/drivers/pci/controller/dwc/pcie-designware.h +++ b/drivers/pci/controller/dwc/pcie-designware.h @@ -25,6 +25,8 @@ #include <linux/pci-epc.h> #include <linux/pci-epf.h> +#include "../../pci.h" + /* DWC PCIe IP-core versions (native support since v4.70a) */ #define DW_PCIE_VER_365A 0x3336352a #define DW_PCIE_VER_460A 0x3436302a @@ -412,6 +414,7 @@ struct dw_pcie_rp { int msg_atu_index; struct resource *msg_res; bool use_linkup_irq; + struct pci_eq_presets presets; }; struct dw_pcie_ep_ops { |