Date:   Tue, 2 Nov 2021 17:00:53 +0800
From:   Zijun Hu <zijuhu@...eaurora.org>
To:     Marcel Holtmann <marcel@...tmann.org>,
        Greg KH <gregkh@...uxfoundation.org>
Cc:     Johan Hedberg <johan.hedberg@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-bluetooth <linux-bluetooth@...r.kernel.org>,
        MSM <linux-arm-msm@...r.kernel.org>,
        Balakrishna Godavarthi <bgodavar@...eaurora.org>,
        c-hbandi@...eaurora.org, Hemantg <hemantg@...eaurora.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Rocky Liao <rjliao@...eaurora.org>,
        Zijun Hu <quic_zijuhu@...cinc.com>
Subject: Re: [PATCH v1 3/3] Bluetooth: hci_qca: Add support for QTI bluetooth
 MAPLE



On 11/2/2021 4:38 PM, Marcel Holtmann wrote:
> Hi Greg,
> 
>>>>> Add support for MAPLE integrated within SOC, it is mounted on
>>>>> a virtual tty port and powered on/off via relevant IOCTL, neither
>>>>> IBS nor RAMPATCH downloading is not required.
>>>>>
>>>>> Signed-off-by: Zijun Hu <quic_zijuhu@...cinc.com>
>>>>> ---
>>>>> drivers/bluetooth/btqca.c   | 13 ++++++++++++-
>>>>> drivers/bluetooth/btqca.h   | 13 +++++++++++++
>>>>> drivers/bluetooth/hci_qca.c | 47 ++++++++++++++++++++++++++++++++++++++++++++-
>>>>> 3 files changed, 71 insertions(+), 2 deletions(-)
>>>>>
>>>>> diff --git a/drivers/bluetooth/btqca.c b/drivers/bluetooth/btqca.c
>>>>> index be04d74037d2..b83d2ecefe5d 100644
>>>>> --- a/drivers/bluetooth/btqca.c
>>>>> +++ b/drivers/bluetooth/btqca.c
>>>>> @@ -255,6 +255,8 @@ static void qca_tlv_check_data(struct hci_dev *hdev,
>>>>> 		BT_DBG("TLV Type\t\t : 0x%x", type_len & 0x000000ff);
>>>>> 		BT_DBG("Length\t\t : %d bytes", length);
>>>>>
>>>>> +		if (qca_is_maple(soc_type))
>>>>> +			break;
>>>>> 		idx = 0;
>>>>> 		data = tlv->data;
>>>>> 		while (idx < length) {
>>>>> @@ -552,6 +554,9 @@ int qca_uart_setup(struct hci_dev *hdev, uint8_t baudrate,
>>>>> 	rom_ver = ((soc_ver & 0x00000f00) >> 0x04) | (soc_ver & 0x0000000f);
>>>>>
>>>>> 	/* Download rampatch file */
>>>>> +	if (qca_is_maple(soc_type))
>>>>> +		goto download_nvm;
>>>>> +
>>>>> 	config.type = TLV_TYPE_PATCH;
>>>>> 	if (qca_is_wcn399x(soc_type)) {
>>>>> 		snprintf(config.fwname, sizeof(config.fwname),
>>>>> @@ -580,6 +585,7 @@ int qca_uart_setup(struct hci_dev *hdev, uint8_t baudrate,
>>>>> 	/* Give the controller some time to get ready to receive the NVM */
>>>>> 	msleep(10);
>>>>>
>>>>> +download_nvm:
>>>>> 	/* Download NVM configuration */
>>>>> 	config.type = TLV_TYPE_NVM;
>>>>> 	if (firmware_name)
>>>>> @@ -597,6 +603,9 @@ int qca_uart_setup(struct hci_dev *hdev, uint8_t baudrate,
>>>>> 	else if (soc_type == QCA_QCA6390)
>>>>> 		snprintf(config.fwname, sizeof(config.fwname),
>>>>> 			 "qca/htnv%02x.bin", rom_ver);
>>>>> +	else if (qca_is_maple(soc_type))
>>>>> +		snprintf(config.fwname, sizeof(config.fwname),
>>>>> +			 "qca/mpnv%02x.bin", rom_ver);
>>>>> 	else if (soc_type == QCA_WCN6750)
>>>>> 		snprintf(config.fwname, sizeof(config.fwname),
>>>>> 			 "qca/msnv%02x.bin", rom_ver);
>>>>> @@ -609,6 +618,8 @@ int qca_uart_setup(struct hci_dev *hdev, uint8_t baudrate,
>>>>> 		bt_dev_err(hdev, "QCA Failed to download NVM (%d)", err);
>>>>> 		return err;
>>>>> 	}
>>>>> +	if (qca_is_maple(soc_type))
>>>>> +		msleep(MAPLE_NVM_READY_DELAY_MS);
>>>>>
>>>>> 	if (soc_type >= QCA_WCN3991) {
>>>>> 		err = qca_disable_soc_logging(hdev);
>>>>> @@ -637,7 +648,7 @@ int qca_uart_setup(struct hci_dev *hdev, uint8_t baudrate,
>>>>> 		return err;
>>>>> 	}
>>>>>
>>>>> -	if (soc_type == QCA_WCN3991 || soc_type == QCA_WCN6750) {
>>>>> +	if (soc_type == QCA_WCN3991 || soc_type == QCA_WCN6750 || qca_is_maple(soc_type)) {
>>>>> 		/* get fw build info */
>>>>> 		err = qca_read_fw_build_info(hdev);
>>>>> 		if (err < 0)
>>>>> diff --git a/drivers/bluetooth/btqca.h b/drivers/bluetooth/btqca.h
>>>>> index 30afa7703afd..0a5a7d1daa71 100644
>>>>> --- a/drivers/bluetooth/btqca.h
>>>>> +++ b/drivers/bluetooth/btqca.h
>>>>> @@ -46,6 +46,8 @@
>>>>>
>>>>> #define QCA_FW_BUILD_VER_LEN		255
>>>>>
>>>>> +#define MAPLE_NVM_READY_DELAY_MS        1500
>>>>> +#define MAPLE_POWER_CONTROL_DELAY_MS    50
>>>>>
>>>>> enum qca_baudrate {
>>>>> 	QCA_BAUDRATE_115200 	= 0,
>>>>> @@ -145,6 +147,7 @@ enum qca_btsoc_type {
>>>>> 	QCA_WCN3991,
>>>>> 	QCA_QCA6390,
>>>>> 	QCA_WCN6750,
>>>>> +	QCA_MAPLE,
>>>>> };
>>>>>
>>>>> #if IS_ENABLED(CONFIG_BT_QCA)
>>>>> @@ -167,6 +170,11 @@ static inline bool qca_is_wcn6750(enum qca_btsoc_type soc_type)
>>>>> 	return soc_type == QCA_WCN6750;
>>>>> }
>>>>>
>>>>> +static inline bool qca_is_maple(enum qca_btsoc_type soc_type)
>>>>> +{
>>>>> +	return soc_type == QCA_MAPLE;
>>>>> +}
>>>>> +
>>>>> #else
>>>>>
>>>>> static inline int qca_set_bdaddr_rome(struct hci_dev *hdev, const bdaddr_t *bdaddr)
>>>>> @@ -204,6 +212,11 @@ static inline bool qca_is_wcn6750(enum qca_btsoc_type soc_type)
>>>>> 	return false;
>>>>> }
>>>>>
>>>>> +static inline bool qca_is_maple(enum qca_btsoc_type soc_type)
>>>>> +{
>>>>> +	return false;
>>>>> +}
>>>>> +
>>>>> static inline int qca_send_pre_shutdown_cmd(struct hci_dev *hdev)
>>>>> {
>>>>> 	return -EOPNOTSUPP;
>>>>> diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
>>>>> index dd768a8ed7cb..f1d9670719c4 100644
>>>>> --- a/drivers/bluetooth/hci_qca.c
>>>>> +++ b/drivers/bluetooth/hci_qca.c
>>>>> @@ -70,6 +70,10 @@
>>>>> #define QCA_CRASHBYTE_PACKET_LEN	1096
>>>>> #define QCA_MEMDUMP_BYTE		0xFB
>>>>>
>>>>> +#ifndef IOCTL_IPC_BOOT
>>>>> +#define IOCTL_IPC_BOOT                  0xBE
>>>>> +#endif
>>>>
>>>> You send this command, but never use it.  Where is the driver code that
>>>> uses this command?
>>>>
>>> qca_maple_power_control() will use it.  this driver depends on bt_tty kernel module
>>> https://source.codeaurora.org/quic/qsdk/oss/kernel/linux-ipq-5.4/tree/drivers/soc/qcom/bt_tty.c?h=NHSS.QSDK.11.5.0.5.r2
>>
>> You can not add code to the kernel that is not used by the kernel
>> itself.  That driver needs to be in the tree as well, why is it not
>> submitted now too?
>>
>>>> And why not tabs?
>>>>
>>>> And why is this patch series not properly threaded so tools can pick it
>>>> up and find them?
>>>>
>>>> And why the odd named ioctl that is different from other ones in this
>>>> file?
>>>>
>>> that IOCTL name is defined by that module.
>>> https://source.codeaurora.org/quic/qsdk/oss/kernel/linux-ipq-5.4/tree/include/linux/bt.h?h=NHSS.QSDK.11.5.0.5.r2
>>
>> Again, it needs to be in the tree.
>>
>>>> And why not just use normal power management hooks for doing things like
>>>> turning on and off the hardware like all other drivers?
>>>>
>>> this device is special.
>>
>> All drivers and devices are special and unique.  Just like all of them :)
>>
>> What is so odd about this device that it can not work with the existing
>> infrastructure that the kernel has for all of the hundreds of thousands
>> of other devices it supports?
>>
>>> it seems BT maintainer decides to drop this patch.
>>
>> Of course, at the very least because there is no in-kernel user, why
>> would you accept such a patch if you were the maintainer?
>>
>> Please submit your driver first.
> 
> this power on via ioctl is nasty business. I am so happy that we got rid of
> the crucks when we finally landed serdev.
> 
> Some people are working on power sequence support and alike. This needs to
> use proper infrastructure or extend existing infrastructure. To fit the
> needs.
> 
> I am just 100% certain, that booting an IPC via an ioctl isn’t it. We
> really suffered through it in the 2.4 kernel days. The hardware needs to
> be described properly in device tree and the kernel needs to take all
> the appropriate actions if a Bluetooth device is powered on via its
> standard power on procedure. And that is through bluetoothd (or if you
> use some other Bluetooth userspace) via the exposed API from the kernel.
> 
thank you. the IOCTL purpose is to bootup the special bluetooth controller.
i have verified this change.
i will submit this change to linux-ipq-5.4 firstly even if need to pick up many changes firstly.


> Regards
> 
> Marcel
> 

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