Re: [PATCH 2/2] wifi: ath12k: Flush the posted write after writing to PCIE_SOC_GLOBAL_RESET
Raj Kumar Bhagat <[email protected]>
| Newsgroups | org.infradead.lists.ath12k,org.infradead.lists.ath11k,org.kernel.vger.linux-kernel,org.kernel.vger.linux-wireless |
|---|---|
| Message-ID | <[email protected]> |
On 23-06-2026 19:46, Manivannan Sadhasivam wrote:
> ath12k_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: d889913205cf ("wifi: ath12k: driver for Qualcomm Wi-Fi 7 devices")
> Reported-by: Alex Williamson<[email protected]>
> Closes:https://lore.kernel.org/linux-pci/[email protected]
> Signed-off-by: Manivannan Sadhasivam<[email protected]>
> ---
> drivers/net/wireless/ath/ath12k/pci.c | 4 ++++
> 1 file changed, 4 insertions(+)
Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.6-01243-QCAHKSWPL_SILICONZ-1
Tested-by: Raj Kumar Bhagat <[email protected]>
Validated with 25+ successful ath12k and ath12k_wifi7 module reload
(rmmod/insmod) cycles on QCN9274.
--
Raj Bhagat