[PATCH v6 0/5] PCI: qcom: Support using the same PHY for both RC and EP
Vinod Koul
vkoul at kernel.org
Mon Oct 17 00:44:38 PDT 2022
On 27-09-22, 12:22, Dmitry Baryshkov wrote:
> Programming of QMP PCIe PHYs slightly differs between RC and EP modes.
>
> Currently both qcom and qcom-ep PCIe controllers setup the PHY in the
> default mode, making it impossible to select at runtime whether the PHY
> should be running in RC or in EP modes. Usually this is not an issue,
> since for most devices only the RC mode is used. Some devices (SDX55)
> currently support only the EP mode without supporting the RC mode (at
> this moment).
>
> Nevertheless some of the Qualcomm platforms (e.g. the aforementioned
> SDX55) would still benefit from being able to switch between RC and EP
> depending on the driver being used. While it is possible to use
> different compat strings for the PHY depending on the mode, it seems
> like an incorrect approach, since the PHY doesn't differ between
> usecases. It's the PCIe controller, who should decide how to configure
> the PHY.
>
> This patch series implements the ability to select between RC and EP
> modes, by allowing the PCIe QMP PHY driver to switch between
> programming tables.
>
> This patchseries depends on the header from the pre-6.1 phy/next. Thus
> after the 6.1 the PCIe patches can be applied independently of the PHY
> part.
Applied, thanks
--
~Vinod
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