BCM2712 PCIEx1 tweaks #6180
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BCM2712 PCIEx1 tweaks #6180
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L1 sub-states require the connection of the CLKREQ# auxiliary signal which is a PCB-level decision, and also depends on the vagrancies of adapters/interposers/slots that may exist between the chip and the endpoint. If this parameter is present, and the RC driver sees an L1 substate capability in the endpoint, then the result is a broken link if CLKREQ# isn't end-to-end connected - regardless of the state of the L1.x enable bits in the RC. Board-specific methods (HAT+ overlay, board DTB) should define this property if required. Signed-off-by: Jonathan Bell <[email protected]>
Interop testing with the M.2 HAT has revealed that there are many quirky endpoint devices out there, so users should have a way of rapidly iterating to find which quirk is causing reliability issues. Signed-off-by: Jonathan Bell <[email protected]>
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See: raspberrypi/linux#6180 kernel: drivers: staging: bcm2835-isp: Respect caller's stride value See: raspberrypi/linux#5960 kernel: drivers: pcie-brcmstb: add best-effort workaround for QoS bug on bcm2712 See: raspberrypi/linux#6183 kernel: ARM: dts: Fix camera sync parameters See: raspberrypi/linux#6184 kernel: Add association between DRM panels and backlight where defined See: raspberrypi/linux#6177
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See: raspberrypi/linux#6180 kernel: drivers: staging: bcm2835-isp: Respect caller's stride value See: raspberrypi/linux#5960 kernel: drivers: pcie-brcmstb: add best-effort workaround for QoS bug on bcm2712 See: raspberrypi/linux#6183 kernel: ARM: dts: Fix camera sync parameters See: raspberrypi/linux#6184 kernel: Add association between DRM panels and backlight where defined See: raspberrypi/linux#6177
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Turning on L1ss by default is more trouble than it's worth, so don't do that.
The compatibility overlay should eventually get the existing pciex1_* dtparams folded in to it, but they've grown documentation arms and legs so can't be immediately deprecated.