[PATCH 2/2] wifi: ath11k: restore country code during resume

[Jeff Johnson]

On 5/19/2024 7:41 PM, Baochen Qiang wrote:
> We got report that regdomain is not correct after
> return from hibernation:
> 
> Before hibernation:
> % iw reg get
> [...]
> phy#0 (self-managed)
> country CH: DFS-ETSI
>         (2402 - 2482 @ 40), (N/A, 20), (N/A)
>         (5170 - 5250 @ 80), (N/A, 23), (N/A), NO-OUTDOOR, AUTO-BW
>         (5250 - 5330 @ 80), (N/A, 23), (0 ms), NO-OUTDOOR, DFS, AUTO-BW
>         (5490 - 5590 @ 80), (N/A, 30), (0 ms), DFS, AUTO-BW
>         (5590 - 5650 @ 40), (N/A, 30), (600000 ms), DFS, AUTO-BW
>         (5650 - 5730 @ 80), (N/A, 30), (0 ms), DFS, AUTO-BW
>         (5735 - 5875 @ 80), (N/A, 14), (N/A), AUTO-BW
> 
> After hibernation:
> % iw reg get
> [...]
> phy#0 (self-managed)
> country na: DFS-UNSET
>         (2402 - 2472 @ 40), (N/A, 20), (N/A)
>         (2457 - 2482 @ 20), (N/A, 20), (N/A), PASSIVE-SCAN
>         (5170 - 5330 @ 160), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN
>         (5490 - 5730 @ 160), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN
>         (5735 - 5895 @ 160), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN
>         (5945 - 7125 @ 160), (N/A, 30), (N/A), AUTO-BW, PASSIVE-SCAN
> 
> The reason is, during resume, firmware is reinitialized but host does
> not send current country code to firmware. So default reg rules with
> country code set to 'na' is uploaded to host, as shown above.
> 
> Fix it by restoring country code to firmware during resume.
> 
> Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.30
> 
> Fixes: 166a490f59ac ("wifi: ath11k: support hibernation")
> Signed-off-by: Baochen Qiang <quic_bqiang at quicinc.com>

Acked-by: Jeff Johnson <quic_jjohnson at quicinc.com>