linux-kernel - [PATCH 3/3] thermal/int340x_thermal: Don't require IDSP to exist

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Date:   Mon, 13 Apr 2020 14:06:44 -0700
From:   Matthew Garrett <matthewgarrett@...gle.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-pm@...r.kernel.org, rui.zhang@...el.com,
        nisha.aram@...el.com, Matthew Garrett <mjg59@...gle.com>
Subject: [PATCH 3/3] thermal/int340x_thermal: Don't require IDSP to exist

From: Matthew Garrett <mjg59@...gle.com>

The IDSP method doesn't appear to exist on the most recent Intel platforms:
instead, the IDSP data is included in the GDDV blob. Since we probably don't
want to decompress and parse that in-kernel, just allow any UUID to be
written if IDSP is missing.

Signed-off-by: Matthew Garrett <mjg59@...gle.com>
---
 .../intel/int340x_thermal/int3400_thermal.c   | 30 ++++++++++++++-----
 1 file changed, 22 insertions(+), 8 deletions(-)

diff --git a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
index f36e3e9d246ea..bece011451e17 100644
--- a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
+++ b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
@@ -96,6 +96,9 @@ static ssize_t available_uuids_show(struct device *dev,
 	int i;
 	int length = 0;
 
+	if (!priv->uuid_bitmap)
+		return sprintf(buf, "UNKNOWN\n");
+
 	for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; i++) {
 		if (priv->uuid_bitmap & (1 << i))
 			if (PAGE_SIZE - length > 0)
@@ -113,11 +116,11 @@ static ssize_t current_uuid_show(struct device *dev,
 {
 	struct int3400_thermal_priv *priv = dev_get_drvdata(dev);
 
-	if (priv->uuid_bitmap & (1 << priv->current_uuid_index))
-		return sprintf(buf, "%s\n",
-			       int3400_thermal_uuids[priv->current_uuid_index]);
-	else
+	if (priv->current_uuid_index == -1)
 		return sprintf(buf, "INVALID\n");
+
+	return sprintf(buf, "%s\n",
+		       int3400_thermal_uuids[priv->current_uuid_index]);
 }
 
 static ssize_t current_uuid_store(struct device *dev,
@@ -128,9 +131,16 @@ static ssize_t current_uuid_store(struct device *dev,
 	int i;
 
 	for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; ++i) {
-		if ((priv->uuid_bitmap & (1 << i)) &&
-		    !(strncmp(buf, int3400_thermal_uuids[i],
-			      sizeof(int3400_thermal_uuids[i]) - 1))) {
+		if (!strncmp(buf, int3400_thermal_uuids[i],
+			     sizeof(int3400_thermal_uuids[i]) - 1)) {
+			/*
+			 * If we have a list of supported UUIDs, make sure
+			 * this one is supported.
+			 */
+			if (priv->uuid_bitmap &&
+			    !(priv->uuid_bitmap & (1 << i)))
+				return -EINVAL;
+
 			priv->current_uuid_index = i;
 			return count;
 		}
@@ -462,9 +472,13 @@ static int int3400_thermal_probe(struct platform_device *pdev)
 	priv->adev = adev;
 
 	result = int3400_thermal_get_uuids(priv);
-	if (result)
+
+	/* Missing IDSP isn't fatal */
+	if (result && result != -ENODEV)
 		goto free_priv;
 
+	priv->current_uuid_index = -1;
+
 	result = acpi_parse_art(priv->adev->handle, &priv->art_count,
 				&priv->arts, true);
 	if (result)
-- 
2.26.0.110.g2183baf09c-goog