Re: [PATCH v2] wifi: rtw89: retry efuse physical map dump on transient failure

[Ping-Ke Shih]

Christian Hewitt <christianshewitt@xxxxxxxxx> wrote:

> On Radxa Rock 5B with a RTL8852BE combo WiFi/BT card, the efuse
> physical map dump intermittently fails with -EBUSY during probe.
> The failure occurs in rtw89_dump_physical_efuse_map_ddv() where
> read_poll_timeout_atomic() times out waiting for the B_AX_EF_RDY
> bit after 1 second.
> 
> The root cause is a timing race during boot: the WiFi driver's
> chip initialization (firmware download via PCIe) overlaps with
> Bluetooth firmware download to the same combo chip via USB. This
> can leave the efuse controller temporarily unavailable when the
> WiFi driver attempts to read the efuse map.
> 
> The firmware download path retries up to 5 times, but the efuse
> read that follows has no similar logic. Address this by adding
> retry loop logic (also up to 5 attempts) around physical efuse
> map dump.
> 
> Signed-off-by: Christian Hewitt <christianshewitt@xxxxxxxxx>

1 patch(es) applied to rtw-next branch of rtw.git, thanks.

d92f6ad6483e wifi: rtw89: retry efuse physical map dump on transient failure

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https://github.com/pkshih/rtw.git