Re: [PATCH] wlcore/wl12xx: Fix wl12xx get_mac error if device is in ELP

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Tony Lindgren <tony@xxxxxxxxxxx> wrote:

> At least on wl12xx, reading the MAC after boot can fail with a warning
> at drivers/net/wireless/ti/wlcore/sdio.c:78 wl12xx_sdio_raw_read.
> The failed call comes from wl12xx_get_mac() that wlcore_nvs_cb() calls
> after request_firmware_work_func().
> 
> After the error, no wireless interface is created. Reloading the wl12xx
> module makes the interface work.
> 
> Turns out the wlan controller can be in a low-power ELP state after the
> boot from the bootloader or kexec, and needs to be woken up first.
> 
> Let's wake the hardware and add a sleep after that similar to
> wl12xx_pre_boot() is already doing.
> 
> Note that a similar issue could exist for wl18xx, but I have not seen it
> so far. And a search for wl18xx_get_mac and wl12xx_sdio_raw_read did not
> produce similar errors.
> 
> Cc: Carl Philipp Klemm <philipp@xxxxxxxx>
> Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>

Patch applied to wireless-drivers-next.git, thanks.

11ef6bc846dc wlcore/wl12xx: Fix wl12xx get_mac error if device is in ELP

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/20210603062814.19464-1-tony@xxxxxxxxxxx/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches




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