netdev - RE: [PATCH v5] Bluetooth: NXP: Add protocol support for NXP Bluetooth chipsets

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Date:   Wed, 1 Mar 2023 15:51:52 +0000
From:   Neeraj sanjay kale <neeraj.sanjaykale@....com>
To:     Sherry Sun <sherry.sun@....com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "marcel@...tmann.org" <marcel@...tmann.org>,
        "johan.hedberg@...il.com" <johan.hedberg@...il.com>,
        "luiz.dentz@...il.com" <luiz.dentz@...il.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "jirislaby@...nel.org" <jirislaby@...nel.org>,
        "alok.a.tiwari@...cle.com" <alok.a.tiwari@...cle.com>,
        "hdanton@...a.com" <hdanton@...a.com>,
        "ilpo.jarvinen@...ux.intel.com" <ilpo.jarvinen@...ux.intel.com>,
        "leon@...nel.org" <leon@...nel.org>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-bluetooth@...r.kernel.org" <linux-bluetooth@...r.kernel.org>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        Amitkumar Karwar <amitkumar.karwar@....com>,
        Rohit Fule <rohit.fule@....com>
Subject: RE: [PATCH v5] Bluetooth: NXP: Add protocol support for NXP Bluetooth
 chipsets

Hi Sherry

> ......
> 
> > +static u8 *nxp_get_fw_name_from_chipid(struct hci_dev *hdev, u16
> > +chipid) {
> > +	u8 *fw_name = NULL;
> > +
> > +	switch (chipid) {
> > +	case CHIP_ID_W9098:
> > +		fw_name = FIRMWARE_W9098;
> > +		break;
> > +	case CHIP_ID_IW416:
> > +		fw_name = FIRMWARE_IW416;
> > +		break;
> > +	case CHIP_ID_IW612:
> > +		fw_name = FIRMWARE_IW612;
> 
> Suppose for each V3 BT chips, you not only need to update the fw_name, but
> also fw_dnld_use_high_baudrate. Don't use the default value in drv_data for
> all chips here.
fw_dnld_use_high_baudrate is not used in the V3 download mechanism, neither do we need it as of now in V3.

> > +
> > +	set_bit(BTNXPUART_FW_DOWNLOADING, &nxpdev->tx_state);
> > +	init_waitqueue_head(&nxpdev->suspend_wait_q);
> > +
> > +	if (!serdev_device_get_cts(nxpdev->serdev)) {
> > +		bt_dev_dbg(hdev, "CTS high. Need FW Download");
> 
> I don't think it's a good idea to use CTS status to determine the BT FW status,
> because many uart drivers only support auto hardware flow control, and
> cannot return the CTS line state.
> Such as for LPUART, serdev_device_get_cts() will always return TIOCM_CTS,
> so here FW may never be downloaded.
I have reworked this part of code and we are now waiting for 1 second to see if we are receiving any bootloader signature from the chip, and downloading FW or moving ahead accordingly.

Please check the v6 patch for the changes.

Thanks,
Neeraj