On Fri, Nov 15, 2024 at 4:42 AM Srinivas Pandruvada srinivas.pandruvada@linux.intel.com wrote:

When the current_uuid attribute is set to active policy UUID, reading back the same attribute is displaying uuid as "INVALID" instead of active policy UUID on some platforms before Ice Lake.

In platforms before Ice Lake, firmware provides list of supported thermal policies. In this case user space can select any of the supported thermal policy via a write to attribute "current_uuid".

With the 'commit c7ff29763989 ("thermal: int340x: Update OS policy capability handshake")', OS policy handshake is updated to support Ice Lake and later platforms. But this treated priv->current_uuid_index=0 as invalid. This priv->current_uuid_index=0 is for active policy. Only priv->current_uuid_index=-1 is invalid.

Fix this issue by treating priv->current_uuid_index=0 as valid.

Fixes: c7ff29763989 ("thermal: int340x: Update OS policy capability handshake") Signed-off-by: Srinivas Pandruvada srinivas.pandruvada@linux.intel.com CC: stable@vger.kernel.org # 5.18+

---

drivers/thermal/intel/int340x_thermal/int3400_thermal.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c index b0c0f0ffdcb0..f547d386ae80 100644 --- a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c +++ b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c @@ -137,7 +137,7 @@ static ssize_t current_uuid_show(struct device *dev, struct int3400_thermal_priv *priv = dev_get_drvdata(dev); int i, length = 0;

•   if (priv->current_uuid_index > 0)
  

•   if (priv->current_uuid_index >= 0)
            return sprintf(buf, "%s\n",
                           int3400_thermal_uuids[priv->current_uuid_index]);
  
  

--

Applied as 6.13-rc material, thanks!