linux-kernel - [PATCH v4 0/3] pci: qcom: Add 16GT/s equalization and margining settings

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Date: Wed, 1 May 2024 09:35:31 -0700
From: Shashank Babu Chinta Venkata <quic_schintav@...cinc.com>
To: <jingoohan1@...il.com>, <gustavo.pimentel@...opsys.com>,
        <manivannan.sadhasivam@...aro.org>, <andersson@...nel.org>,
        <agross@...nel.org>, <konrad.dybcio@...aro.org>, <mani@...nel.org>
CC: <quic_msarkar@...cinc.com>, <quic_kraravin@...cinc.com>,
        Lorenzo Pieralisi
	<lpieralisi@...nel.org>,
        Krzysztof Wilczyński
	<kw@...ux.com>,
        Rob Herring <robh@...nel.org>, Bjorn Helgaas
	<bhelgaas@...gle.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Serge Semin <fancer.lancer@...il.com>,
        Conor Dooley
	<conor.dooley@...rochip.com>,
        <linux-kernel@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>
Subject: [PATCH v4 0/3] pci: qcom: Add 16GT/s equalization and margining settings

Add 16GT/s specific equalization and rx lane margining settings. These
settings are inline with respective PHY settings for 16GT/s 
operation. 

In addition, current QCOM EP and RC drivers do not share common
codebase which would result in code duplication. Hence, adding
common files for code reusability among RC and EP drivers.

v3 -> v4:
- Addressed review comments from Mani and Konrad.
- Preceded subject line with pci: qcom: tags

v2 -> v3:
- Replaced FIELD_GET/FIELD_PREP macros for bit operations.
- Renamed cmn to common.
- Avoided unnecessary argument validations.
- Addressed review comments from Konrad and Mani.

v1 -> v2:
- Capitilized commit message to be inline with history 
- Dropped stubs from header file.
- Moved Designware specific register offsets and masks to
  pcie-designware.h header file.
- Applied settings based on bus data rate rather than link generation.
- Addressed review comments from Bjorn and Frank.

Shashank Babu Chinta Venkata (3):
  PCI: qcom: Refactor common code
  PCI: qcom: Add equalization settings for 16 GT/s
  PCI: qcom: Add RX margining settings for 16 GT/s

 drivers/pci/controller/dwc/Kconfig            |   5 +
 drivers/pci/controller/dwc/Makefile           |   1 +
 drivers/pci/controller/dwc/pcie-designware.h  |  30 ++++
 drivers/pci/controller/dwc/pcie-qcom-common.c | 144 ++++++++++++++++++
 drivers/pci/controller/dwc/pcie-qcom-common.h |  14 ++
 drivers/pci/controller/dwc/pcie-qcom-ep.c     |  44 ++----
 drivers/pci/controller/dwc/pcie-qcom.c        |  74 ++-------
 7 files changed, 218 insertions(+), 94 deletions(-)
 create mode 100644 drivers/pci/controller/dwc/pcie-qcom-common.c
 create mode 100644 drivers/pci/controller/dwc/pcie-qcom-common.h

-- 
2.43.2