linux-kernel - Re: [PATCH v3 1/2] Bluetooth: hci

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Date:   Wed, 13 Mar 2019 11:52:49 +0530
From:   c-hbandi@...eaurora.org
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     marcel@...tmann.org, johan.hedberg@...il.com,
        linux-kernel@...r.kernel.org, linux-bluetooth@...r.kernel.org,
        hemantg@...eaurora.org, linux-arm-msm@...r.kernel.org,
        bgodavar@...eaurora.org, anubhavg@...eaurora.org
Subject: Re: [PATCH v3 1/2] Bluetooth: hci_qca: Added support for wcn3998

Hi Matthias,



On 2019-03-12 21:59, Matthias Kaehlcke wrote:
> Hi Harish,
> 
> On Tue, Mar 12, 2019 at 05:52:58PM +0530, Harish Bandi wrote:
>> Added new compatible for wcn3998 and corresponding voltage
>> and current values to wcn3998 compatible.
>> Changed driver code to support wcn3998
>> 
>> Signed-off-by: Harish Bandi <c-hbandi@...eaurora.org>
>> ---
>> changes in v3:
>> - updated to latest code base.
> 
> This is not useful, for future versions please describe what changed
> (e.g. 'specify regulator constraints in the driver instead of the DT')
> 

[Harish] --  added details in v2, and v3 uploaded just to rebase on tip 
of bluetooth-next
for better understanding of code in review. From new patch onwards will 
add all patch
version changes and add proper description.

>> ---
>>  drivers/bluetooth/btqca.c   |  4 ++--
>>  drivers/bluetooth/btqca.h   |  3 ++-
>>  drivers/bluetooth/hci_qca.c | 40 
>> ++++++++++++++++++++++++++--------------
>>  3 files changed, 30 insertions(+), 17 deletions(-)
>> 
>> diff --git a/drivers/bluetooth/btqca.c b/drivers/bluetooth/btqca.c
>> index 6122685..70cab13 100644
>> --- a/drivers/bluetooth/btqca.c
>> +++ b/drivers/bluetooth/btqca.c
>> @@ -344,7 +344,7 @@ int qca_uart_setup(struct hci_dev *hdev, uint8_t 
>> baudrate,
>> 
>>  	/* Download rampatch file */
>>  	config.type = TLV_TYPE_PATCH;
>> -	if (soc_type == QCA_WCN3990) {
>> +	if (soc_type >= QCA_WCN3990) {
> 
> That works, but isn't super-clear and might need to be adapted when
> future non-WCN399x controllers are added.
> 
> Some possible alternatives:
> 
> - is_wcn399x(soc_type)
> - have a family (Rome, Cherokee (IIRC this name was used for WCN3990))
>   and a chip id (QCA6174, WCN3990, WCN3998, ...)
> 

[Harish] -- Will change like is_wcn399x(soc_type) and come up with new 
patch

>>  		/* Firmware files to download are based on ROM version.
>>  		 * ROM version is derived from last two bytes of soc_ver.
>>  		 */
>> @@ -365,7 +365,7 @@ int qca_uart_setup(struct hci_dev *hdev, uint8_t 
>> baudrate,
>> 
>>  	/* Download NVM configuration */
>>  	config.type = TLV_TYPE_NVM;
>> -	if (soc_type == QCA_WCN3990)
>> +	if (soc_type >= QCA_WCN3990)
>>  		snprintf(config.fwname, sizeof(config.fwname),
>>  			 "qca/crnv%02x.bin", rom_ver);
>>  	else
>> diff --git a/drivers/bluetooth/btqca.h b/drivers/bluetooth/btqca.h
>> index c72c56e..f03d96e 100644
>> --- a/drivers/bluetooth/btqca.h
>> +++ b/drivers/bluetooth/btqca.h
>> @@ -132,7 +132,8 @@ enum qca_btsoc_type {
>>  	QCA_INVALID = -1,
>>  	QCA_AR3002,
>>  	QCA_ROME,
>> -	QCA_WCN3990
>> +	QCA_WCN3990,
>> +	QCA_WCN3998
> 
> nit: if you add a comma after the last value the line doesn't need to
> be changed when a new type is added in the future.
> 
[Harish] -- will take care in new patch

> Is 'WCN3998' specific enough? You mentioned earlier that there are
> multiple WCN3998 variants with different requirements for regulator
> voltages/max currents. Which names does Qualcomm use to distinguish
> between them (e.g. WCN3998-A, WCN3998-B, ...)?

[Harish] -- for now we want to add WCN3998 support only, What i mean to 
say in my earlier
explanation that. WCN3990 is base variant and on top of that we have 
variants like WCN3990,
WCN3998 and WCN3998-0,WCN3998-1 like that..

> 
> Thanks
> 
> Matthias

Thanks,
Harish