[RFC] Bluetooth: btusb: Use DMI matching for QCA reset_resume quirking

[Hans de Goede <hdegoede@redhat.com>]

Commit 61f5acea8737 ("Bluetooth: btusb: Restore QCA Rome suspend/resume fix
with a "rewritten" version") applied the USB_QUIRK_RESET_RESUME to all QCA
btusb devices. But it turns out that the resume problems are not caused by
the QCA Rome chipset, on most platforms it resumes fine. The resume
problems are actually a platform problem (likely the platform cutting all
power when suspended).

The USB_QUIRK_RESET_RESUME quirk also disable runtime suspend, so by
matching on usb-ids, we're causing all boards with these chips to use extra
power, to fix resume problems which only happen on some boards.

This commit fixes this by applying the quirk based on DMI matching instead
of on usb-ids, so that we match the platform and not the chipset.

Fixes: 61f5acea8737 ("Bluetooth: btusb: Restore QCA Rome suspend/resume..")
Cc: stable@vger.kernel.org
Cc: Brian Norris <briannorris@chromium.org>
Cc: Kai-Heng Feng <kai.heng.feng@canonical.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/bluetooth/btusb.c | 26 ++++++++++++++++++++------
 1 file changed, 20 insertions(+), 6 deletions(-)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 2a55380ad730..a6023667f3b4 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -21,6 +21,7 @@
  *
  */
 
+#include <linux/dmi.h>
 #include <linux/module.h>
 #include <linux/usb.h>
 #include <linux/usb/quirks.h>
@@ -379,6 +380,22 @@ static const struct usb_device_id blacklist_table[] = {
 	{ }	/* Terminating entry */
 };
 
+/*
+ * The btusb build into some devices needs to be reset on resume, this is a
+ * problem with the platform (likely shutting off all power) not with the
+ * btusb chip itself. So we use a DMI list to match known broken platforms.
+ */
+static const struct dmi_system_id btusb_plat_needs_reset_resume_list[] = {
+	{
+		/* Lenovo yoga 920 */
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo YOGA 920"),
+		},
+	},
+	{}
+};
+
 #define BTUSB_MAX_ISOC_FRAMES	10
 
 #define BTUSB_INTR_RUNNING	0
@@ -2945,6 +2962,9 @@ static int btusb_probe(struct usb_interface *intf,
 	hdev->send   = btusb_send_frame;
 	hdev->notify = btusb_notify;
 
+	if (dmi_check_system(btusb_plat_needs_reset_resume_list))
+		interface_to_usbdev(intf)->quirks |= USB_QUIRK_RESET_RESUME;
+
 #ifdef CONFIG_PM
 	err = btusb_config_oob_wake(hdev);
 	if (err)
@@ -3031,12 +3051,6 @@ static int btusb_probe(struct usb_interface *intf,
 	if (id->driver_info & BTUSB_QCA_ROME) {
 		data->setup_on_usb = btusb_setup_qca;
 		hdev->set_bdaddr = btusb_set_bdaddr_ath3012;
-
-		/* QCA Rome devices lose their updated firmware over suspend,
-		 * but the USB hub doesn't notice any status change.
-		 * explicitly request a device reset on resume.
-		 */
-		interface_to_usbdev(intf)->quirks |= USB_QUIRK_RESET_RESUME;
 	}
 
 #ifdef CONFIG_BT_HCIBTUSB_RTL
-- 
2.14.3