system/easy-kernel: patch a few macintosh thermal issues (#283)

1 files changed, 136 insertions, 0 deletions

diff --git a/system/easy-kernel/therm_windtunnel.patch b/system/easy-kernel/therm_windtunnel.patch
new file mode 100644
index 000000000..5cfb92d7f
--- /dev/null
+++ b/system/easy-kernel/therm_windtunnel.patch
@@ -0,0 +1,136 @@
+From 176cacef0119a441af14ccdfa125461635a1054d Mon Sep 17 00:00:00 2001
+From: Wolfram Sang <wsa@the-dreams.de>
+Date: Tue, 25 Feb 2020 15:12:29 +0100
+Subject: [PATCH] macintosh: therm_windtunnel: fix regression when
+ instantiating devices
+
+commit 38b17afb0ebb9ecd41418d3c08bcf9198af4349d upstream.
+
+Removing attach_adapter from this driver caused a regression for at
+least some machines. Those machines had the sensors described in their
+DT, too, so they didn't need manual creation of the sensor devices. The
+old code worked, though, because manual creation came first. Creation of
+DT devices then failed later and caused error logs, but the sensors
+worked nonetheless because of the manually created devices.
+
+When removing attach_adaper, manual creation now comes later and loses
+the race. The sensor devices were already registered via DT, yet with
+another binding, so the driver could not be bound to it.
+
+This fix refactors the code to remove the race and only manually creates
+devices if there are no DT nodes present. Also, the DT binding is updated
+to match both, the DT and manually created devices. Because we don't
+know which device creation will be used at runtime, the code to start
+the kthread is moved to do_probe() which will be called by both methods.
+
+Fixes: 3e7bed52719d ("macintosh: therm_windtunnel: drop using attach_adapter")
+Link: https://bugzilla.kernel.org/show_bug.cgi?id=201723
+Reported-by: Erhard Furtner <erhard_f@mailbox.org>
+Tested-by: Erhard Furtner <erhard_f@mailbox.org>
+Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
+Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
+Cc: stable@kernel.org # v4.19+
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/macintosh/therm_windtunnel.c | 52 +++++++++++++++++-----------
+ 1 file changed, 31 insertions(+), 21 deletions(-)
+
+diff --git a/drivers/macintosh/therm_windtunnel.c b/drivers/macintosh/therm_windtunnel.c
+index 8c744578122a..a0d87ed9da69 100644
+--- a/drivers/macintosh/therm_windtunnel.c
++++ b/drivers/macintosh/therm_windtunnel.c
+@@ -300,9 +300,11 @@ static int control_loop(void *dummy)
+ /*	i2c probing and setup						*/
+ /************************************************************************/
+ 
+-static int
+-do_attach( struct i2c_adapter *adapter )
++static void do_attach(struct i2c_adapter *adapter)
+ {
++	struct i2c_board_info info = { };
++	struct device_node *np;
++
+ 	/* scan 0x48-0x4f (DS1775) and 0x2c-2x2f (ADM1030) */
+ 	static const unsigned short scan_ds1775[] = {
+ 		0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
+@@ -313,25 +315,24 @@ do_attach( struct i2c_adapter *adapter )
+ 		I2C_CLIENT_END
+ 	};
+ 
+-	if( strncmp(adapter->name, "uni-n", 5) )
+-		return 0;
+-
+-	if( !x.running ) {
+-		struct i2c_board_info info;
++	if (x.running || strncmp(adapter->name, "uni-n", 5))
++		return;
+ 
+-		memset(&info, 0, sizeof(struct i2c_board_info));
+-		strlcpy(info.type, "therm_ds1775", I2C_NAME_SIZE);
++	np = of_find_compatible_node(adapter->dev.of_node, NULL, "MAC,ds1775");
++	if (np) {
++		of_node_put(np);
++	} else {
++		strlcpy(info.type, "MAC,ds1775", I2C_NAME_SIZE);
+ 		i2c_new_probed_device(adapter, &info, scan_ds1775, NULL);
++	}
+ 
+-		strlcpy(info.type, "therm_adm1030", I2C_NAME_SIZE);
++	np = of_find_compatible_node(adapter->dev.of_node, NULL, "MAC,adm1030");
++	if (np) {
++		of_node_put(np);
++	} else {
++		strlcpy(info.type, "MAC,adm1030", I2C_NAME_SIZE);
+ 		i2c_new_probed_device(adapter, &info, scan_adm1030, NULL);
+-
+-		if( x.thermostat && x.fan ) {
+-			x.running = 1;
+-			x.poll_task = kthread_run(control_loop, NULL, "g4fand");
+-		}
+ 	}
+-	return 0;
+ }
+ 
+ static int
+@@ -404,8 +405,8 @@ attach_thermostat( struct i2c_client *cl )
+ enum chip { ds1775, adm1030 };
+ 
+ static const struct i2c_device_id therm_windtunnel_id[] = {
+-	{ "therm_ds1775", ds1775 },
+-	{ "therm_adm1030", adm1030 },
++	{ "MAC,ds1775", ds1775 },
++	{ "MAC,adm1030", adm1030 },
+ 	{ }
+ };
+ MODULE_DEVICE_TABLE(i2c, therm_windtunnel_id);
+@@ -414,6 +415,7 @@ static int
+ do_probe(struct i2c_client *cl, const struct i2c_device_id *id)
+ {
+ 	struct i2c_adapter *adapter = cl->adapter;
++	int ret = 0;
+ 
+ 	if( !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA
+ 				     | I2C_FUNC_SMBUS_WRITE_BYTE) )
+@@ -421,11 +423,19 @@ do_probe(struct i2c_client *cl, const struct i2c_device_id *id)
+ 
+ 	switch (id->driver_data) {
+ 	case adm1030:
+-		return attach_fan( cl );
++		ret = attach_fan(cl);
++		break;
+ 	case ds1775:
+-		return attach_thermostat(cl);
++		ret = attach_thermostat(cl);
++		break;
+ 	}
+-	return 0;
++
++	if (!x.running && x.thermostat && x.fan) {
++		x.running = 1;
++		x.poll_task = kthread_run(control_loop, NULL, "g4fand");
++	}
++
++	return ret;
+ }
+ 
+ static struct i2c_driver g4fan_driver = {