[PATCH] drm/amd/pm: correct the fan speed retrieving in PWM for some SMU13 asics

[Evan Quan]

For SMU 13.0.0 and 13.0.7, the output from PMFW is in percent. Driver
need to convert that into correct PMW(255) based.

Signed-off-by: Evan Quan <evan.quan at amd.com>
Change-Id: I7bbeae3c0d81c6cf6e0033aa28ca6d26f5b6d178
---
 .../gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_0_ppt.c  | 15 ++++++++++++---
 .../gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c  | 15 ++++++++++++---
 2 files changed, 24 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_0_ppt.c b/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_0_ppt.c
index 636cb561fea9..283cf7cf95ab 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_0_ppt.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_0_ppt.c
@@ -1445,12 +1445,21 @@ static void smu_v13_0_0_get_unique_id(struct smu_context *smu)
 static int smu_v13_0_0_get_fan_speed_pwm(struct smu_context *smu,
 					 uint32_t *speed)
 {
+	int ret = 0;
+
 	if (!speed)
 		return -EINVAL;
 
-	return smu_v13_0_0_get_smu_metrics_data(smu,
-						METRICS_CURR_FANPWM,
-						speed);
+	ret = smu_v13_0_0_get_smu_metrics_data(smu,
+					       METRICS_CURR_FANPWM,
+					       speed);
+	if (ret)
+		return ret;
+
+	/* Convert the PMFW output which is in percent to pwm(255) based */
+	*speed = MIN(*speed * 255 / 100, 255);
+
+	return 0;
 }
 
 static int smu_v13_0_0_get_fan_speed_rpm(struct smu_context *smu,
diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c b/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c
index 5e937e4efb51..f207f102ed7e 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c
@@ -1365,12 +1365,21 @@ static int smu_v13_0_7_populate_umd_state_clk(struct smu_context *smu)
 static int smu_v13_0_7_get_fan_speed_pwm(struct smu_context *smu,
 					 uint32_t *speed)
 {
+	int ret = 0;
+
 	if (!speed)
 		return -EINVAL;
 
-	return smu_v13_0_7_get_smu_metrics_data(smu,
-						METRICS_CURR_FANPWM,
-						speed);
+	ret = smu_v13_0_7_get_smu_metrics_data(smu,
+					       METRICS_CURR_FANPWM,
+					       speed);
+	if (ret)
+		return ret;
+
+	/* Convert the PMFW output which is in percent to pwm(255) based */
+	*speed = MIN(*speed * 255 / 100, 255);
+
+	return 0;
 }
 
 static int smu_v13_0_7_get_fan_speed_rpm(struct smu_context *smu,
-- 
2.34.1