From a7df17cfca593ece7a5367b43c263e4c359c6f16 Mon Sep 17 00:00:00 2001 From: Vasily Khoruzhick Date: Wed, 31 Oct 2018 19:40:18 -0700 Subject: [PATCH] Bluetooth: Add new quirk for broken local ext features max_page Some adapters (e.g. RTL8723CS) advertise that they have more than 2 pages for local ext features, but they don't support any features declared in these pages. RTL8723CS reports max_page = 2 and declares support for sync train and secure connection, but it responds with either garbage or with error in status on corresponding commands. Signed-off-by: Vasily Khoruzhick --- include/net/bluetooth/hci.h | 7 +++++++ net/bluetooth/hci_event.c | 4 +++- 2 files changed, 10 insertions(+), 1 deletion(-) diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h index 5bc1e30dedde..fa394436bbd3 100644 --- a/include/net/bluetooth/hci.h +++ b/include/net/bluetooth/hci.h @@ -204,6 +204,13 @@ enum { * */ HCI_QUIRK_NON_PERSISTENT_SETUP, + + /* When this quirk is set, max_page for local extended features + * is set to 1, even if controller reports higher number. Some + * controllers (e.g. RTL8723CS) report more pages, but they + * don't actually support features declared there. + */ + HCI_QUIRK_BROKEN_LOCAL_EXT_FTR_MAX_PAGE, }; /* HCI device flags */ diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c index c1d3a303d97f..98f2d3555fd8 100644 --- a/net/bluetooth/hci_event.c +++ b/net/bluetooth/hci_event.c @@ -684,7 +684,9 @@ static void hci_cc_read_local_ext_features(struct hci_dev *hdev, if (rp->status) return; - if (hdev->max_page < rp->max_page) + if (!test_bit(HCI_QUIRK_BROKEN_LOCAL_EXT_FTR_MAX_PAGE, + &hdev->quirks) && + hdev->max_page < rp->max_page) hdev->max_page = rp->max_page; if (rp->page < HCI_MAX_PAGES)