[PATCH] drm/xe/hwmon: Simplify and fix 32b wrap

[Lucas De Marchi]

Like done in commit eaa287069a70 ("drm/xe/guc_submit: Simplify and fix
diff calculation"), just use u32 for wrapping the value, which is
simpler and more correct: when wrapping on 32b, the accumulated value
was off by one.

Cc: Badal Nilawar <badal.nilawar at intel.com>
Reviewed-by: Raag Jadav <raag.jadav at intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
---
 drivers/gpu/drm/xe/xe_hwmon.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_hwmon.c b/drivers/gpu/drm/xe/xe_hwmon.c
index eb293aec36a0f..afb9eef2c681e 100644
--- a/drivers/gpu/drm/xe/xe_hwmon.c
+++ b/drivers/gpu/drm/xe/xe_hwmon.c
@@ -306,16 +306,11 @@ xe_hwmon_energy_get(struct xe_hwmon *hwmon, int channel, long *energy)
 {
 	struct xe_mmio *mmio = xe_root_tile_mmio(hwmon->xe);
 	struct xe_hwmon_energy_info *ei = &hwmon->ei[channel];
-	u64 reg_val;
+	u32 reg_val;
 
 	reg_val = xe_mmio_read32(mmio, xe_hwmon_get_reg(hwmon, REG_PKG_ENERGY_STATUS,
 							channel));
-
-	if (reg_val >= ei->reg_val_prev)
-		ei->accum_energy += reg_val - ei->reg_val_prev;
-	else
-		ei->accum_energy += UINT_MAX - ei->reg_val_prev + reg_val;
-
+	ei->accum_energy += reg_val - ei->reg_val_prev;
 	ei->reg_val_prev = reg_val;
 
 	*energy = mul_u64_u32_shr(ei->accum_energy, SF_ENERGY,