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

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Date: Thu, 30 May 2024 20:02:54 +0530
From: Manivannan Sadhasivam <mani@...nel.org>
To: Shashank Babu Chinta Venkata <quic_schintav@...cinc.com>
Cc: jingoohan1@...il.com, gustavo.pimentel@...opsys.com,
	manivannan.sadhasivam@...aro.org, andersson@...nel.org,
	agross@...nel.org, konrad.dybcio@...aro.org,
	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: Re: [PATCH v4 0/3] pci: qcom: Add 16GT/s equalization and margining
 settings

On Wed, May 01, 2024 at 09:35:31AM -0700, Shashank Babu Chinta Venkata wrote:
> 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.
> 

For the next revision, please rebase on top of [1].

- Mani

[1] https://lore.kernel.org/linux-pci/20240518-opp_support-v13-2-78c73edf50de@quicinc.com/

> 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
> 

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