Bitterblue Smith <rtl8821cerfe2@xxxxxxxxx> wrote:
> Currently it takes almost 6 seconds to upload the firmware for RTL8192CU
> (and 11 seconds for RTL8192DU). That's because the firmware is uploaded
> one byte at a time.
>
> Also, after plugging the device, the firmware gets uploaded three times
> before a connection to the AP is established.
>
> Maybe this is fine for most users, but when testing changes to the
> driver it's really annoying to wait so long.
>
> Speed up the firmware upload by writing chunks of 64 bytes at a time.
> This way it takes about 110 ms for RTL8192CU (and about 210 ms for
> RTL8192DU).
>
> PCI devices could upload it in chunks of 4 bytes, but I don't have any
> to test and commit 89d32c9071aa ("rtlwifi: Download firmware as bytes
> rather than as dwords") decided otherwise anyway.
>
> Allocate memory for the firmware image with kmalloc instead of vzalloc
> because this memory is passed directly to usb_control_msg(), which
> can't take memory allocated by vmalloc.
>
> Signed-off-by: Bitterblue Smith <rtl8821cerfe2@xxxxxxxxx>
> Acked-by: Ping-Ke Shih <pkshih@xxxxxxxxxxx>
Patch applied to wireless-next.git, thanks.
b06439c66874 wifi: rtlwifi: Speed up firmware loading for USB
--
https://patchwork.kernel.org/project/linux-wireless/patch/d9bd4949-6e92-4f35-8b60-3b45f9ad74ab@xxxxxxxxx/
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
