linux-kernel - Re: [PATCH v2 0/4] usb: typec: tipd: add patch update support for tps6598x

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Message-ID: <b0963302-b498-4a81-b635-0b4faf02e83b@wolfvision.net>
Date: Thu, 4 Jan 2024 17:36:35 +0100
From: Javier Carrasco <javier.carrasco@...fvision.net>
To: Roger Quadros <rogerq@...nel.org>, Jai Luthra <j-luthra@...com>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
 linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org, vigneshr@...com,
 d-gole@...com, nm@...com
Subject: Re: [PATCH v2 0/4] usb: typec: tipd: add patch update support for
 tps6598x

On 04.01.24 17:15, Roger Quadros wrote:
> 
> 
> On 04/01/2024 17:47, Jai Luthra wrote:
>> Hi Javier,
>> The following change seems to fix boot on SK-AM62A without reverting 
>> this whole series:
>>
>> ------------------
>>
>> diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
>> index a956eb976906a5..8ba2aa05db519b 100644
>> --- a/drivers/usb/typec/tipd/core.c
>> +++ b/drivers/usb/typec/tipd/core.c
>> @@ -1223,11 +1223,16 @@ static int cd321x_reset(struct tps6598x *tps)
>>  	return 0;
>>  }
>>  
>> -static int tps6598x_reset(struct tps6598x *tps)
>> +static int tps25750_reset(struct tps6598x *tps)
>>  {
>>  	return tps6598x_exec_cmd_tmo(tps, "GAID", 0, NULL, 0, NULL, 2000, 0);
>>  }
>>  
>> +static int tps6598x_reset(struct tps6598x *tps)
>> +{
>> +	return 0;
>> +}
>> +
>>  static int
>>  tps25750_register_port(struct tps6598x *tps, struct fwnode_handle *fwnode)
>>  {
>> @@ -1545,7 +1550,7 @@ static const struct tipd_data tps25750_data = {
>>  	.trace_status = trace_tps25750_status,
>>  	.apply_patch = tps25750_apply_patch,
>>  	.init = tps25750_init,
>> -	.reset = tps6598x_reset,
>> +	.reset = tps25750_reset,
>>  };
>>  
>>  static const struct of_device_id tps6598x_of_match[] = {
>>
>> ------------------
>>
>> I am not an expert on this, will let you/others decide on what should be 
>> the correct way to reset TPS6598x for patching without breaking this SK.
>>
>>
> 
> This looks like a correct fix to me.
> Could you please send a proper PATCH with Fixes tag? Thanks!
> 
Hi Roger,

that fix only removes the reset function and does nothing instead, but
the reset call is identical for both devices (hence why there was a
single function for both devices). As I mentioned in my reply to Jai
Luthra, I would like to know why the reset is triggered and why that
should not happen.

Thanks and best regards,
Javier Carrasco