Kodiak PCIe phy refclk always on changes #29
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…property Document qcom,refclk-always-on property which is needed in some platforms to supply refclk even in PCIe low power states. Signed-off-by: Krishna chaitanya chundru <[email protected]> Link: https://lore.kernel.org/lkml/[email protected]/
…fset Some platforms needs to keep endpoint refclk always on, for this purpose add this offset for all the applicable phy versions. And also add reg layout for few controllers as we are adding endpoint refclk control register which changes based upon phy version. Signed-off-by: Krishna chaitanya chundru <[email protected]> Reviewed-by: Dmitry Baryshkov <[email protected]> Link: https://lore.kernel.org/lkml/[email protected]/
In PCIe low power states like L1.1 or L1.2 the phy will stop supplying refclk to endpoint. If endpoint asserts clkreq to bring back link L0, then RC needs to provide refclk to endpoint. Some platforms with pcie switch fail to drive the clkreq signal to the host from the endpoints because of the switch board design. Due to that refclk needs to supplied to the endpoint always. Add a flag to keep refclk always supplied to endpoint. Signed-off-by: Krishna chaitanya chundru <[email protected]> Reviewed-by: Dmitry Baryshkov <[email protected]> Link: https://lore.kernel.org/lkml/20231201060928.GK4009@thinkpad/
shashim-quic
reviewed
Jun 3, 2025
shashim-quic
reviewed
Jun 3, 2025
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These are changes required to keep PCIe link always on.