Hi all,
I'm trying to get the on-board wifi/bt chip on my Utilite Pro (an ARM
imx6q based device) working. It is an AW-NH387 chip which is based on
Marvell's SD8787 chipset.
Unfortunately, the btmrvl{,-sdio} fails to probe with the following error:
Bluetooth: FW failed to be active in time!
Bluetooth: Downloading firmware failed!
The vendor kernel comes with a workaround which also works with recent
mainline kernels (e.g. v4.12-rc1): It removes the SD8787 Bluetooth AMP
device from the btmrvl_sdio_ids array in btmrvl_sdio.c (see below for a
diff against v4.12-rc1). Note that only the AMP device is removed -- the
plain SD8787 Bluetooth device entry is still there.
This coincides with the fact that the latest firmware for the sd8787 in
linux-firmware does not support the Bluetooth AMP device [1]. So my
guess is that the firmware gets messed up when probing for the
unsupported AMP device.
Now to my actual question: how do I get this properly supported upstream?
I don't see how I could prevent Linux from probing the AMP device
depending on the firmware version or some other condition (i.e. a module
parameter). And removing the device entry from the btmrvl_sdio_ids array
feels wrong because it is actually correct -- the device is on the sdio bus.
Any help would be very much appreciated!
Cheers,
Christopher
P.S.: I were also unable to find any other devicetree based board in the
upstream tree that uses the sd8787 over sdio, although there is e.g. a
dedicated sd8787 mmc-pwrseq driver...
[1]
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/commit/mrvl/sd8787_uapsta.bin?id=690541ee758104fc0e7f4c17af962fa669be1524
---
diff --git a/drivers/bluetooth/btmrvl_sdio.c
b/drivers/bluetooth/btmrvl_sdio.c
index eb794f0..0635a3d 100644
--- a/drivers/bluetooth/btmrvl_sdio.c
+++ b/drivers/bluetooth/btmrvl_sdio.c
@@ -295,9 +295,11 @@ static const struct sdio_device_id
btmrvl_sdio_ids[] = {
/* Marvell SD8787 Bluetooth device */
{ SDIO_DEVICE(SDIO_VENDOR_ID_MARVELL, 0x911A),
.driver_data = (unsigned long)&btmrvl_sdio_sd8787 },
+#if 0
/* Marvell SD8787 Bluetooth AMP device */
{ SDIO_DEVICE(SDIO_VENDOR_ID_MARVELL, 0x911B),
.driver_data = (unsigned long)&btmrvl_sdio_sd8787 },
+#endif
/* Marvell SD8797 Bluetooth device */
{ SDIO_DEVICE(SDIO_VENDOR_ID_MARVELL, 0x912A),
.driver_data = (unsigned long)&btmrvl_sdio_sd8797 },
--
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