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Date: Tue, 2 Nov 2021 16:54:23 +0800
From: Zijun Hu <zijuhu@...eaurora.org>
To: Greg KH <gregkh@...uxfoundation.org>
Cc: marcel@...tmann.org, johan.hedberg@...il.com,
linux-kernel@...r.kernel.org, linux-bluetooth@...r.kernel.org,
linux-arm-msm@...r.kernel.org, bgodavar@...eaurora.org,
c-hbandi@...eaurora.org, hemantg@...eaurora.org, mka@...omium.org,
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 4:22 PM, Greg KH wrote:
> On Tue, Nov 02, 2021 at 03:53:33PM +0800, Zijun Hu wrote:
>>
>>
>> On 11/2/2021 3:35 PM, Greg KH wrote:
>>> On Tue, Nov 02, 2021 at 03:12:57PM +0800, Zijun Hu wrote:
>>>> From: Zijun Hu <quic_zijuhu@...cinc.com>
>>>>
>>>> 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?
>
the bt_tty driver module is not developed and maintained by me.
bluetooth driver code of linux-ipq-5.4 stopped update at Sep 15 2019.
many relevant changes need to be picked up from bluetooth-next if apply this patch int to linux-ipq-5.4
>>> 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.
>
make sense, i will try to submit this change to linux-ipq-5.4
>>> 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?
>
UART is a standard BT H/W interface. so this change depends on bt_tty which
emulate a tty port. so this change use it.
>> 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.
>
okay, make sense. thank you
> thanks,
>
> greg k-h
>
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