linux-kernel - [PATCH] asus-wmi: Increase FAN_CURVE_BUF

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Date:   Sun, 28 Aug 2022 19:46:38 +1200
From:   "Luke D. Jones" <luke@...nes.dev>
To:     hdegoede@...hat.com
Cc:     linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
        platform-driver-x86@...r.kernel.org, markgross@...nel.org,
        "Luke D. Jones" <luke@...nes.dev>
Subject: [PATCH] asus-wmi: Increase FAN_CURVE_BUF_LEN to 32

Fix for TUF laptops returning with an -ENOSPC on calling
asus_wmi_evaluate_method_buf() when fetching default curves. The TUF method
requires at least 32 bytes space.

This also moves and changes the pr_debug() in fan_curve_check_present() to
pr_warn() in fan_curve_get_factory_default() so that there is at least some
indication in logs of why it fails.

Signed-off-by: Luke D. Jones <luke@...nes.dev>
---
 drivers/platform/x86/asus-wmi.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index 3d9fd58573f9..11203213e00d 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -108,7 +108,7 @@ module_param(fnlock_default, bool, 0444);
 #define WMI_EVENT_MASK			0xFFFF
 
 #define FAN_CURVE_POINTS		8
-#define FAN_CURVE_BUF_LEN		(FAN_CURVE_POINTS * 2)
+#define FAN_CURVE_BUF_LEN		32
 #define FAN_CURVE_DEV_CPU		0x00
 #define FAN_CURVE_DEV_GPU		0x01
 /* Mask to determine if setting temperature or percentage */
@@ -2383,8 +2383,10 @@ static int fan_curve_get_factory_default(struct asus_wmi *asus, u32 fan_dev)
 	curves = &asus->custom_fan_curves[fan_idx];
 	err = asus_wmi_evaluate_method_buf(asus->dsts_id, fan_dev, mode, buf,
 					   FAN_CURVE_BUF_LEN);
-	if (err)
+	if (err) {
+		pr_warn("%s (0x%08x) failed: %d\n", __func__, fan_dev, err);
 		return err;
+	}
 
 	fan_curve_copy_from_buf(curves, buf);
 	curves->device_id = fan_dev;
@@ -2402,9 +2404,6 @@ static int fan_curve_check_present(struct asus_wmi *asus, bool *available,
 
 	err = fan_curve_get_factory_default(asus, fan_dev);
 	if (err) {
-		pr_debug("fan_curve_get_factory_default(0x%08x) failed: %d\n",
-			 fan_dev, err);
-		/* Don't cause probe to fail on devices without fan-curves */
 		return 0;
 	}
 
-- 
2.37.2