drm/i915/hwmon: Replace hwm_field_scale_and_write with hwm_power_max_write

hwm_field_scale_and_write has a single caller hwm_power_write and is
specific to hwm_power_write but makes it appear that it is a general
function which can have multiple callers. Replace the function with
hwm_power_max_write which is specific to hwm_power_write and use that in
future patches where the function needs to be extended.
Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230216164944.2366150-2-ashutosh.dixit@intel.com

drivers/gpu/drm/i915/i915_hwmon.c

@@ -99,20 +99,6 @@ hwm_field_read_and_scale(struct hwm_drvdata *ddat, i915_reg_t rgadr,
 	return mul_u64_u32_shr(reg_value, scale_factor, nshift);
 }
 
-static void
-hwm_field_scale_and_write(struct hwm_drvdata *ddat, i915_reg_t rgadr,
-			  int nshift, unsigned int scale_factor, long lval)
-{
-	u32 nval;
-
-	/* Computation in 64-bits to avoid overflow. Round to nearest. */
-	nval = DIV_ROUND_CLOSEST_ULL((u64)lval << nshift, scale_factor);
-
-	hwm_locked_with_pm_intel_uncore_rmw(ddat, rgadr,
-					    PKG_PWR_LIM_1,
-					    REG_FIELD_PREP(PKG_PWR_LIM_1, nval));
-}
-
 /*
  * hwm_energy - Obtain energy value
  *
@@ -391,6 +377,21 @@ hwm_power_max_read(struct hwm_drvdata *ddat, long *val)
 	return 0;
 }
 
+static int
+hwm_power_max_write(struct hwm_drvdata *ddat, long val)
+{
+	struct i915_hwmon *hwmon = ddat->hwmon;
+	u32 nval;
+
+	/* Computation in 64-bits to avoid overflow. Round to nearest. */
+	nval = DIV_ROUND_CLOSEST_ULL((u64)val << hwmon->scl_shift_power, SF_POWER);
+
+	hwm_locked_with_pm_intel_uncore_rmw(ddat, hwmon->rg.pkg_rapl_limit,
+					    PKG_PWR_LIM_1,
+					    REG_FIELD_PREP(PKG_PWR_LIM_1, nval));
+	return 0;
+}
+
 static int
 hwm_power_read(struct hwm_drvdata *ddat, u32 attr, int chan, long *val)
 {
@@ -425,16 +426,11 @@ hwm_power_read(struct hwm_drvdata *ddat, u32 attr, int chan, long *val)
 static int
 hwm_power_write(struct hwm_drvdata *ddat, u32 attr, int chan, long val)
 {
-	struct i915_hwmon *hwmon = ddat->hwmon;
 	u32 uval;
 
 	switch (attr) {
 	case hwmon_power_max:
-		hwm_field_scale_and_write(ddat,
-					  hwmon->rg.pkg_rapl_limit,
-					  hwmon->scl_shift_power,
-					  SF_POWER, val);
-		return 0;
+		return hwm_power_max_write(ddat, val);
 	case hwmon_power_crit:
 		uval = DIV_ROUND_CLOSEST_ULL(val << POWER_SETUP_I1_SHIFT, SF_POWER);
 		return hwm_pcode_write_i1(ddat->uncore->i915, uval);