fbe416808bb5fa9314c49a7dc09b1abde5ad0d9365b7be08c85abf46.patch

From 1f528237cd9fffff8f801254bbe749234ce0c26e Mon Sep 17 00:00:00 2001
From: Lorenzo Bianconi <lorenzo@kernel.org>
Date: Sun, 8 Aug 2021 21:11:49 +0200
Subject: [PATCH] BACKPORT: FROMGIT: mt76: overwrite default reg_ops if
 necessary

Introduce mt76_register_debugfs_fops routine in order to
define per-driver regs file operations and make sure the
device is up before reading or writing its registers

Fixes: 1d8efc741df8 'mt76: mt7921: introduce Runtime PM support'
Fixes: de5ff3c9d1a2 'mt76: mt7615: introduce pm_power_save delayed work'
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

(cherry picked from commit c384de605e3319dc9298088ab01cdfc549f750d9
 https://github.com/nbd168/wireless.git mt76)

Conflicts:
   drivers/net/wireless/mediatek/mt76/debugfs.c

Backport Notes:
   It is context only.

BUG=b:178754244, b:188614537
TEST=build on cherry

Signed-off-by: Sean Wang <objelf@gmail.com>
Change-Id: Ic940021e67842cee423485f29aa4966f4cef8d02
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/3151506
Reviewed-by: Joshua Emele <jemele@chromium.org>
Tested-by: Joshua Emele <jemele@chromium.org>
Commit-Queue: Joshua Emele <jemele@chromium.org>
---
 drivers/net/wireless/mediatek/mt76/debugfs.c  | 10 ++++---
 drivers/net/wireless/mediatek/mt76/mt76.h     |  8 ++++-
 .../wireless/mediatek/mt76/mt7615/debugfs.c   | 29 ++++++++++++++++++-
 .../wireless/mediatek/mt76/mt7921/debugfs.c   | 28 +++++++++++++++++-
 4 files changed, 68 insertions(+), 7 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/debugfs.c b/drivers/net/wireless/mediatek/mt76/debugfs.c
--- a/drivers/net/wireless/mediatek/mt76/debugfs.c
+++ b/drivers/net/wireless/mediatek/mt76/debugfs.c
@@ -116,8 +116,11 @@ static int mt76_read_rate_txpower(struct seq_file *s, void *data)
 	return 0;
 }
 
-struct dentry *mt76_register_debugfs(struct mt76_dev *dev)
+struct dentry *
+mt76_register_debugfs_fops(struct mt76_dev *dev,
+			   const struct file_operations *ops)
 {
+	const struct file_operations *fops = ops ? ops : &fops_regval;
 	struct dentry *dir;
 
 	dir = debugfs_create_dir("mt76", dev->hw->wiphy->debugfsdir);
@@ -126,8 +129,7 @@ struct dentry *mt76_register_debugfs(struct mt76_dev *dev)
 
 	debugfs_create_u8("led_pin", 0600, dir, &dev->led_pin);
 	debugfs_create_u32("regidx", 0600, dir, &dev->debugfs_reg);
-	debugfs_create_file_unsafe("regval", 0600, dir, dev,
-				   &fops_regval);
+	debugfs_create_file_unsafe("regval", 0600, dir, dev, fops);
 	debugfs_create_file_unsafe("napi_threaded", 0600, dir, dev,
 				   &fops_napi_threaded);
 	debugfs_create_blob("eeprom", 0400, dir, &dev->eeprom);
@@ -140,4 +142,4 @@ struct dentry *mt76_register_debugfs(struct mt76_dev *dev)
 
 	return dir;
 }
-EXPORT_SYMBOL_GPL(mt76_register_debugfs);
+EXPORT_SYMBOL_GPL(mt76_register_debugfs_fops);
diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h b/drivers/net/wireless/mediatek/mt76/mt76.h
--- a/drivers/net/wireless/mediatek/mt76/mt76.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76.h
@@ -879,7 +879,13 @@ struct mt76_phy *mt76_alloc_phy(struct mt76_dev *dev, unsigned int size,
 int mt76_register_phy(struct mt76_phy *phy, bool vht,
 		      struct ieee80211_rate *rates, int n_rates);
 
-struct dentry *mt76_register_debugfs(struct mt76_dev *dev);
+struct dentry *mt76_register_debugfs_fops(struct mt76_dev *dev,
+					  const struct file_operations *ops);
+static inline struct dentry *mt76_register_debugfs(struct mt76_dev *dev)
+{
+	return mt76_register_debugfs_fops(dev, NULL);
+}
+
 int mt76_queues_read(struct seq_file *s, void *data);
 void mt76_seq_puts_array(struct seq_file *file, const char *str,
 			 s8 *val, int len);
diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/debugfs.c b/drivers/net/wireless/mediatek/mt76/mt7615/debugfs.c
--- a/drivers/net/wireless/mediatek/mt76/mt7615/debugfs.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/debugfs.c
@@ -2,6 +2,33 @@
 
 #include "mt7615.h"
 
+static int
+mt7615_reg_set(void *data, u64 val)
+{
+	struct mt7615_dev *dev = data;
+
+	mt7615_mutex_acquire(dev);
+	mt76_wr(dev, dev->mt76.debugfs_reg, val);
+	mt7615_mutex_release(dev);
+
+	return 0;
+}
+
+static int
+mt7615_reg_get(void *data, u64 *val)
+{
+	struct mt7615_dev *dev = data;
+
+	mt7615_mutex_acquire(dev);
+	*val = mt76_rr(dev, dev->mt76.debugfs_reg);
+	mt7615_mutex_release(dev);
+
+	return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(fops_regval, mt7615_reg_get, mt7615_reg_set,
+			 "0x%08llx\n");
+
 static int
 mt7615_radar_pattern_set(void *data, u64 val)
 {
@@ -506,7 +533,7 @@ int mt7615_init_debugfs(struct mt7615_dev *dev)
 {
 	struct dentry *dir;
 
-	dir = mt76_register_debugfs(&dev->mt76);
+	dir = mt76_register_debugfs_fops(&dev->mt76, &fops_regval);
 	if (!dir)
 		return -ENOMEM;
 
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c b/drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c
--- a/drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c
@@ -4,6 +4,32 @@
 #include "mt7921.h"
 #include "eeprom.h"
 
+static int
+mt7921_reg_set(void *data, u64 val)
+{
+	struct mt7921_dev *dev = data;
+
+	mt7921_mutex_acquire(dev);
+	mt76_wr(dev, dev->mt76.debugfs_reg, val);
+	mt7921_mutex_release(dev);
+
+	return 0;
+}
+
+static int
+mt7921_reg_get(void *data, u64 *val)
+{
+	struct mt7921_dev *dev = data;
+
+	mt7921_mutex_acquire(dev);
+	*val = mt76_rr(dev, dev->mt76.debugfs_reg);
+	mt7921_mutex_release(dev);
+
+	return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(fops_regval, mt7921_reg_get, mt7921_reg_set,
+			 "0x%08llx\n");
 static int
 mt7921_fw_debug_set(void *data, u64 val)
 {
@@ -381,7 +407,7 @@ int mt7921_init_debugfs(struct mt7921_dev *dev)
 {
 	struct dentry *dir;
 
-	dir = mt76_register_debugfs(&dev->mt76);
+	dir = mt76_register_debugfs_fops(&dev->mt76, &fops_regval);
 	if (!dir)
 		return -ENOMEM;
 
-- 
2.33.0.464.g1972c5931b-goog