linux-kernel - Re: [PATCH v9 1/3] firmware: ti_sci: Remove constant 0 function arguments

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Message-Id: <DDVTDY4T9I21.2MG05Z8984M5T@baylibre.com>
Date: Thu, 30 Oct 2025 17:57:53 +0100
From: "Markus Schneider-Pargmann" <msp@...libre.com>
To: "Andrew Davis" <afd@...com>, "Markus Schneider-Pargmann (TI.com)"
 <msp@...libre.com>, "Nishanth Menon" <nm@...com>, "Tero Kristo"
 <kristo@...nel.org>, "Santosh Shilimkar" <ssantosh@...nel.org>
Cc: "Vishal Mahaveer" <vishalm@...com>, "Kevin Hilman"
 <khilman@...libre.com>, "Dhruva Gole" <d-gole@...com>, "Sebin Francis"
 <sebin.francis@...com>, "Kendall Willis" <k-willis@...com>, "Akashdeep
 Kaur" <a-kaur@...com>, <linux-arm-kernel@...ts.infradead.org>,
 <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v9 1/3] firmware: ti_sci: Remove constant 0 function
 arguments

Hi Andrew,

On Thu Oct 30, 2025 at 3:13 PM CET, Andrew Davis wrote:
> On 10/30/25 4:26 AM, Markus Schneider-Pargmann (TI.com) wrote:
>> ti_sci_cmd_prepare_sleep takes three arguments ctx_lo, ctx_hi and
>> debug_flags which are always 0 for the caller. Remove these arguments as
>> they are basically unused.
>> 
>
> They might not be used today, but the TI-SCI command does support
> passing them, so why remove that ability from the wrapper function?

Thank you. I removed the arguments as I prefer something like

  return ti_sci_cmd_prepare_sleep(&info->handle,
                                  TISCI_MSG_VALUE_SLEEP_MODE_DM_MANAGED);

over

  return ti_sci_cmd_prepare_sleep(&info->handle,
                                  TISCI_MSG_VALUE_SLEEP_MODE_DM_MANAGED,
                                  0, 0, 0);

As this function is not part of any API and only used by
ti_sci_prepare_system_suspend I didn't see a problem in removing it.
Also I don't know of any code that will be using these arguments.

If you prefer I can drop this patch.

Best
Markus

>
> Andrew
>
>> Signed-off-by: Markus Schneider-Pargmann (TI.com) <msp@...libre.com>
>> ---
>>   drivers/firmware/ti_sci.c | 15 +++++----------
>>   1 file changed, 5 insertions(+), 10 deletions(-)
>> 
>> diff --git a/drivers/firmware/ti_sci.c b/drivers/firmware/ti_sci.c
>> index 49fd2ae01055d0f425062147422471f0fd49e4bd..24ab392b4a5d0460153de76fe382371e319d8f2e 100644
>> --- a/drivers/firmware/ti_sci.c
>> +++ b/drivers/firmware/ti_sci.c
>> @@ -1661,14 +1661,10 @@ static int ti_sci_cmd_clk_get_freq(const struct ti_sci_handle *handle,
>>    * ti_sci_cmd_prepare_sleep() - Prepare system for system suspend
>>    * @handle:		pointer to TI SCI handle
>>    * @mode:		Device identifier
>> - * @ctx_lo:		Low part of address for context save
>> - * @ctx_hi:		High part of address for context save
>> - * @debug_flags:	Debug flags to pass to firmware
>>    *
>>    * Return: 0 if all went well, else returns appropriate error value.
>>    */
>> -static int ti_sci_cmd_prepare_sleep(const struct ti_sci_handle *handle, u8 mode,
>> -				    u32 ctx_lo, u32 ctx_hi, u32 debug_flags)
>> +static int ti_sci_cmd_prepare_sleep(const struct ti_sci_handle *handle, u8 mode)
>>   {
>>   	struct ti_sci_info *info;
>>   	struct ti_sci_msg_req_prepare_sleep *req;
>> @@ -1696,9 +1692,9 @@ static int ti_sci_cmd_prepare_sleep(const struct ti_sci_handle *handle, u8 mode,
>>   
>>   	req = (struct ti_sci_msg_req_prepare_sleep *)xfer->xfer_buf;
>>   	req->mode = mode;
>> -	req->ctx_lo = ctx_lo;
>> -	req->ctx_hi = ctx_hi;
>> -	req->debug_flags = debug_flags;
>> +	req->ctx_lo = 0;
>> +	req->ctx_hi = 0;
>> +	req->debug_flags = 0;
>>   
>>   	ret = ti_sci_do_xfer(info, xfer);
>>   	if (ret) {
>> @@ -3689,8 +3685,7 @@ static int ti_sci_prepare_system_suspend(struct ti_sci_info *info)
>>   			 * internal use and can be 0
>>   			 */
>>   			return ti_sci_cmd_prepare_sleep(&info->handle,
>> -							TISCI_MSG_VALUE_SLEEP_MODE_DM_MANAGED,
>> -							0, 0, 0);
>> +							TISCI_MSG_VALUE_SLEEP_MODE_DM_MANAGED);
>>   		} else {
>>   			/* DM Managed is not supported by the firmware. */
>>   			dev_err(info->dev, "Suspend to memory is not supported by the firmware\n");
>> 


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