Re: [PATCH 1/2] wifi: ath11k: Flush the posted write after writing to PCIE_SOC_GLOBAL_RESET
Baochen Qiang <[email protected]> Fri, 3 Jul 2026 15:03:08 +0800
| Newsgroups | org.infradead.lists.ath11k,org.infradead.lists.ath12k,org.kernel.vger.linux-kernel,org.kernel.vger.linux-wireless |
|---|---|
| Message-ID | <[email protected]> |
On 6/23/2026 10:16 PM, Manivannan Sadhasivam wrote:
> ath11k_pci_soc_global_reset() tries to reset the device by writing to the
> PCIE_SOC_GLOBAL_RESET register. But it doesn't do a read-back to ensure
> that the write gets flushed to the device before the delay.
>
> This may lead to the delay on the host to be insufficient, if the posted
> write doesn't reach the device before the delay.
>
> So add a read-back after writing to the PCIE_SOC_GLOBAL_RESET register and
> before the delay.
>
> Compile tested only.
>
> Fixes: f3c603d412b3 ("ath11k: reset MHI during power down and power up")
> Reported-by: Alex Williamson <[email protected]>
> Closes: https://lore.kernel.org/linux-pci/[email protected]
> Signed-off-by: Manivannan Sadhasivam <[email protected]>
Reviewed-by: Baochen Qiang <[email protected]>