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

[Armin Wolf]

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@xxxxxxxxx>
> > Signed-off-by: Armin Wolf <W_Armin@xxxxxx>
> > ---
> >   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.

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