linux-kernel - Re: [PATCH v4 3/5] platform/x86: acer-wmi: Improve error handling when reading gaming system information

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Message-ID: <z4big77gnqc5q2tvhv3oupzzycp7lsofogs3tzozr3fd2pqkyr@ouospkvcsxj7>
Date: Tue, 10 Dec 2024 01:18:24 -0300
From: Kurt Borja <kuurtb@...il.com>
To: Armin Wolf <W_Armin@....de>
Cc: jlee@...e.com, farhan.anwar8@...il.com, rayanmargham4@...il.com, 
	hdegoede@...hat.com, ilpo.jarvinen@...ux.intel.com, 
	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/5] platform/x86: acer-wmi: Improve error handling
 when reading gaming system information

On Tue, Dec 10, 2024 at 05:08:01AM +0100, Armin Wolf wrote:
> Am 10.12.24 um 03:06 schrieb Kurt Borja:
> 
> > On Tue, Dec 10, 2024 at 01:16:55AM +0100, Armin Wolf wrote:
> > > If a call to ACER_WMID_GET_GAMING_SYS_INFO_METHODID fails, the lower
> > > 8 bits will be non-zero. Introduce a helper function to check this and
> > > use it when reading gaming system information.
> > > 
> > > Tested-by: Rayan Margham <rayanmargham4@...il.com>
> > > Signed-off-by: Armin Wolf <W_Armin@....de>
> > > ---
> > >   drivers/platform/x86/acer-wmi.c | 55 +++++++++++++++++++++------------
> > >   1 file changed, 36 insertions(+), 19 deletions(-)
> > > 
> > > diff --git a/drivers/platform/x86/acer-wmi.c b/drivers/platform/x86/acer-wmi.c
> > > index dd57787466b9..ac4500f33b8c 100644
> > > --- a/drivers/platform/x86/acer-wmi.c
> > > +++ b/drivers/platform/x86/acer-wmi.c
> > > @@ -70,6 +70,7 @@ MODULE_LICENSE("GPL");
> > > 
> > >   #define ACER_PREDATOR_V4_THERMAL_PROFILE_EC_OFFSET 0x54
> > > 
> > > +#define ACER_PREDATOR_V4_RETURN_STATUS_BIT_MASK GENMASK_ULL(7, 0)
> > >   #define ACER_PREDATOR_V4_FAN_SPEED_READ_BIT_MASK GENMASK(20, 8)
> > > 
> > >   /*
> > > @@ -1513,6 +1514,24 @@ static acpi_status WMID_gaming_get_u64(u64 *value, u32 cap)
> > >   	return status;
> > >   }
> > > 
> > > +static int WMID_gaming_get_sys_info(u32 command, u64 *out)
> > > +{
> > > +	acpi_status status;
> > > +	u64 result;
> > > +
> > > +	status = WMI_gaming_execute_u64(ACER_WMID_GET_GAMING_SYS_INFO_METHODID, command, &result);
> > > +	if (ACPI_FAILURE(status))
> > > +		return -EIO;
> > > +
> > > +	/* The return status must be zero for the operation to have succeeded */
> > > +	if (FIELD_GET(ACER_PREDATOR_V4_RETURN_STATUS_BIT_MASK, result))
> > > +		return -EIO;
> > > +
> > > +	*out = result;
> > > +
> > > +	return 0;
> > > +}
> > > +
> > >   static void WMID_gaming_set_fan_mode(u8 fan_mode)
> > >   {
> > >   	/* fan_mode = 1 is used for auto, fan_mode = 2 used for turbo*/
> > > @@ -1762,22 +1781,23 @@ static int acer_gsensor_event(void)
> > > 
> > >   static int acer_get_fan_speed(int fan)
> > >   {
> > > -	if (quirks->predator_v4) {
> > > -		acpi_status status;
> > > -		u64 fanspeed;
> > > +	u64 fanspeed;
> > > +	u32 command;
> > > +	int ret;
> > > 
> > > -		status = WMI_gaming_execute_u64(
> > > -			ACER_WMID_GET_GAMING_SYS_INFO_METHODID,
> > > -			fan == 0 ? ACER_WMID_CMD_GET_PREDATOR_V4_CPU_FAN_SPEED :
> > > -				   ACER_WMID_CMD_GET_PREDATOR_V4_GPU_FAN_SPEED,
> > > -			&fanspeed);
> > > +	if (!quirks->predator_v4)
> > > +		return -EOPNOTSUPP;
> > > 
> > > -		if (ACPI_FAILURE(status))
> > > -			return -EIO;
> > > +	if (fan == 0)
> > > +		command = ACER_WMID_CMD_GET_PREDATOR_V4_CPU_FAN_SPEED;
> > > +	else
> > > +		command = ACER_WMID_CMD_GET_PREDATOR_V4_GPU_FAN_SPEED;
> > > 
> > > -		return FIELD_GET(ACER_PREDATOR_V4_FAN_SPEED_READ_BIT_MASK, fanspeed);
> > > -	}
> > > -	return -EOPNOTSUPP;
> > > +	ret = WMID_gaming_get_sys_info(command, &fanspeed);
> > > +	if (ret < 0)
> > > +		return ret;
> > > +
> > > +	return FIELD_GET(ACER_PREDATOR_V4_FAN_SPEED_READ_BIT_MASK, fanspeed);
> > >   }
> > I wonder if it's necessary to refactor this function if you are going to
> > drop it on Patch 4.
> 
> I did it so each patch has a single well-defined scope. And refactoring this function was necessary for
> the patch being complete.

I'll keep that in mind when submitting.

In that case:

Reviewed-by: Kurt Borja <kuurtb@...il.com>

I apologize If this was out of place, as I'm still learning!

~ Kurt

> 
> Thanks,
> Armin Wolf
> 
> > >   /*
> > > @@ -1942,12 +1962,9 @@ static int acer_thermal_profile_change(void)
> > >   			return err;
> > > 
> > >   		/* Check power source */
> > > -		status = WMI_gaming_execute_u64(
> > > -			ACER_WMID_GET_GAMING_SYS_INFO_METHODID,
> > > -			ACER_WMID_CMD_GET_PREDATOR_V4_BAT_STATUS, &on_AC);
> > > -
> > > -		if (ACPI_FAILURE(status))
> > > -			return -EIO;
> > > +		err = WMID_gaming_get_sys_info(ACER_WMID_CMD_GET_PREDATOR_V4_BAT_STATUS, &on_AC);
> > > +		if (err < 0)
> > > +			return err;
> > > 
> > >   		switch (current_tp) {
> > >   		case ACER_PREDATOR_V4_THERMAL_PROFILE_TURBO:
> > > --
> > > 2.39.5
> > >