Re: [PATCH AUTOSEL 6.18-6.1] PCI: Wait for device readiness after D3hot -> D0uninitialized transition

[sashiko-bot@kernel.org]

> From: Bjorn Helgaas <helgaas@kernel.org>
> 
> [ Upstream commit 41167a1e98536b4baf0846fd259c8124bd1c4e1b ]
> 
> For a device that advertises No_Soft_Reset == 0, a transition from D3hot to
> D0uninitialized is a soft reset, and the resulting internal device state is
> undefined.
> 
> Per PCIe r7.0, sec 2.3.1, a transition from D3hot to D0uninitialized
> mandates a minimum 10 ms delay before accessing the device. Following this
> delay, the device is permitted to respond to initial configuration requests
> with a Request Retry Status (RRS) completion status if it needs more time
> to initialize.
> 
> Call pci_dev_wait() after pci_power_up() performs a D3hot->D0uninitialized
> transition to ensure the device is ready to accept config accesses, as is
> done after the similar transition in pci_pm_reset().
> 
> If the device is already ready, this is essentially a no-op except for one
> additional config read.
> 
> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
> Reviewed-by: Rafael J. Wysocki (Intel) <rafael@kernel.org>
> Link: https://patch.msgid.link/20260518191220.636213-3-bhelgaas@google.com
> Signed-off-by: Sasha Levin <sashal@kernel.org>

Sashiko has reviewed this patch and found no issues. It looks great!

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