[PATCH v5 0/2] Bluetooth: btrtl: add support for the RTL8723CS

[PATCH v5 0/2] Bluetooth: btrtl: add support for the RTL8723CS

[Bastian Germann]

Pinebook uses RTL8723CS for WiFi and bluetooth. Unfortunately, RTL8723CS
has broken BT-4.1 support, so it requires a quirk.

Add a quirk and wire up 8723CS support in btrtl.
I was asked for a btmon output without the quirk;
however, using the chip without the quirk ends up in a bad state with
"Opcode 0x c77 failed: -56" (HCI_OP_READ_SYNC_TRAIN_PARAMS) on training.
A btmon output with the quirk active was already sent by Vasily.

v1 of this series was sent in July 2020 by Vasily Khoruzhick.
I have tested it to work on the Pinebook.

Changelog:
v2:
   * Rebase
   * Add uart-has-rtscts to device tree as requested by reviewer
v3:
   * Drop the device tree as it was split out and is already integrated.
   * Rename the quirk as requested by reviewer Marcel Holtmann
v4:
   * Use skb_pull_data as requested by reviewer Luiz Augusto von Dentz
v5:
   * Make use of skb_pull_data's length check

Vasily Khoruzhick (2):
  Bluetooth: Add new quirk for broken local ext features page 2
  Bluetooth: btrtl: add support for the RTL8723CS

 drivers/bluetooth/btrtl.c   | 120 ++++++++++++++++++++++++++++++++++--
 drivers/bluetooth/btrtl.h   |   5 ++
 drivers/bluetooth/hci_h5.c  |   4 ++
 include/net/bluetooth/hci.h |   7 +++
 net/bluetooth/hci_event.c   |   4 +-
 5 files changed, 135 insertions(+), 5 deletions(-)

-- 
2.39.1

[PATCH v5 1/2] Bluetooth: Add new quirk for broken local ext features page 2

[Bastian Germann]

From: Vasily Khoruzhick <anarsoul@gmail.com>

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 <anarsoul@gmail.com>
Signed-off-by: Bastian Germann <bage@debian.org>
---
 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 8d773b042c85..7127313140cf 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -294,6 +294,13 @@ enum {
 	 * during the hdev->setup vendor callback.
 	 */
 	HCI_QUIRK_BROKEN_MWS_TRANSPORT_CONFIG,
+
+	/* 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_FEATURES_PAGE_2,
 };
 
 /* HCI device flags */
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index ad92a4be5851..83ebc8e65b42 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -886,7 +886,9 @@ static u8 hci_cc_read_local_ext_features(struct hci_dev *hdev, void *data,
 	if (rp->status)
 		return rp->status;
 
-	if (hdev->max_page < rp->max_page)
+	if (!test_bit(HCI_QUIRK_BROKEN_LOCAL_EXT_FEATURES_PAGE_2,
+		      &hdev->quirks) &&
+	    hdev->max_page < rp->max_page)
 		hdev->max_page = rp->max_page;
 
 	if (rp->page < HCI_MAX_PAGES)
-- 
2.39.1

[PATCH v5 2/2] Bluetooth: btrtl: add support for the RTL8723CS

[Bastian Germann]

From: Vasily Khoruzhick <anarsoul@gmail.com>

The Realtek RTL8723CS is a SDIO WiFi chip. It also contains a Bluetooth
module which is connected via UART to the host.

It shares lmp subversion with 8703B, so Realtek's userspace
initialization tool (rtk_hciattach) differentiates varieties of RTL8723CS
(CG, VF, XX) with RTL8703B using vendor's command to read chip type.

Also this chip declares support for some features it doesn't support
so add a quirk to indicate that these features are broken.

Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Signed-off-by: Bastian Germann <bage@debian.org>
---
 drivers/bluetooth/btrtl.c  | 120 +++++++++++++++++++++++++++++++++++--
 drivers/bluetooth/btrtl.h  |   5 ++
 drivers/bluetooth/hci_h5.c |   4 ++
 3 files changed, 125 insertions(+), 4 deletions(-)

diff --git a/drivers/bluetooth/btrtl.c b/drivers/bluetooth/btrtl.c
index 69c3fe649ca7..44b672cca69e 100644
--- a/drivers/bluetooth/btrtl.c
+++ b/drivers/bluetooth/btrtl.c
@@ -17,7 +17,11 @@
 
 #define VERSION "0.1"
 
+#define RTL_CHIP_8723CS_CG	3
+#define RTL_CHIP_8723CS_VF	4
+#define RTL_CHIP_8723CS_XX	5
 #define RTL_EPATCH_SIGNATURE	"Realtech"
+#define RTL_ROM_LMP_8703B	0x8703
 #define RTL_ROM_LMP_8723A	0x1200
 #define RTL_ROM_LMP_8723B	0x8723
 #define RTL_ROM_LMP_8821A	0x8821
@@ -30,6 +34,7 @@
 #define IC_MATCH_FL_HCIREV	(1 << 1)
 #define IC_MATCH_FL_HCIVER	(1 << 2)
 #define IC_MATCH_FL_HCIBUS	(1 << 3)
+#define IC_MATCH_FL_CHIP_TYPE	(1 << 4)
 #define IC_INFO(lmps, hcir, hciv, bus) \
 	.match_flags = IC_MATCH_FL_LMPSUBV | IC_MATCH_FL_HCIREV | \
 		       IC_MATCH_FL_HCIVER | IC_MATCH_FL_HCIBUS, \
@@ -59,6 +64,7 @@ struct id_table {
 	__u16 hci_rev;
 	__u8 hci_ver;
 	__u8 hci_bus;
+	__u8 chip_type;
 	bool config_needed;
 	bool has_rom_version;
 	bool has_msft_ext;
@@ -99,6 +105,39 @@ static const struct id_table ic_id_table[] = {
 	  .fw_name  = "rtl_bt/rtl8723b_fw.bin",
 	  .cfg_name = "rtl_bt/rtl8723b_config" },
 
+	/* 8723CS-CG */
+	{ .match_flags = IC_MATCH_FL_LMPSUBV | IC_MATCH_FL_CHIP_TYPE |
+			 IC_MATCH_FL_HCIBUS,
+	  .lmp_subver = RTL_ROM_LMP_8703B,
+	  .chip_type = RTL_CHIP_8723CS_CG,
+	  .hci_bus = HCI_UART,
+	  .config_needed = true,
+	  .has_rom_version = true,
+	  .fw_name  = "rtl_bt/rtl8723cs_cg_fw.bin",
+	  .cfg_name = "rtl_bt/rtl8723cs_cg_config" },
+
+	/* 8723CS-VF */
+	{ .match_flags = IC_MATCH_FL_LMPSUBV | IC_MATCH_FL_CHIP_TYPE |
+			 IC_MATCH_FL_HCIBUS,
+	  .lmp_subver = RTL_ROM_LMP_8703B,
+	  .chip_type = RTL_CHIP_8723CS_VF,
+	  .hci_bus = HCI_UART,
+	  .config_needed = true,
+	  .has_rom_version = true,
+	  .fw_name  = "rtl_bt/rtl8723cs_vf_fw.bin",
+	  .cfg_name = "rtl_bt/rtl8723cs_vf_config" },
+
+	/* 8723CS-XX */
+	{ .match_flags = IC_MATCH_FL_LMPSUBV | IC_MATCH_FL_CHIP_TYPE |
+			 IC_MATCH_FL_HCIBUS,
+	  .lmp_subver = RTL_ROM_LMP_8703B,
+	  .chip_type = RTL_CHIP_8723CS_XX,
+	  .hci_bus = HCI_UART,
+	  .config_needed = true,
+	  .has_rom_version = true,
+	  .fw_name  = "rtl_bt/rtl8723cs_xx_fw.bin",
+	  .cfg_name = "rtl_bt/rtl8723cs_xx_config" },
+
 	/* 8723D */
 	{ IC_INFO(RTL_ROM_LMP_8723B, 0xd, 0x8, HCI_USB),
 	  .config_needed = true,
@@ -208,7 +247,8 @@ static const struct id_table ic_id_table[] = {
 	};
 
 static const struct id_table *btrtl_match_ic(u16 lmp_subver, u16 hci_rev,
-					     u8 hci_ver, u8 hci_bus)
+					     u8 hci_ver, u8 hci_bus,
+					     u8 chip_type)
 {
 	int i;
 
@@ -225,6 +265,9 @@ static const struct id_table *btrtl_match_ic(u16 lmp_subver, u16 hci_rev,
 		if ((ic_id_table[i].match_flags & IC_MATCH_FL_HCIBUS) &&
 		    (ic_id_table[i].hci_bus != hci_bus))
 			continue;
+		if ((ic_id_table[i].match_flags & IC_MATCH_FL_CHIP_TYPE) &&
+		    (ic_id_table[i].chip_type != chip_type))
+			continue;
 
 		break;
 	}
@@ -307,6 +350,7 @@ static int rtlbt_parse_firmware(struct hci_dev *hdev,
 		{ RTL_ROM_LMP_8723B, 1 },
 		{ RTL_ROM_LMP_8821A, 2 },
 		{ RTL_ROM_LMP_8761A, 3 },
+		{ RTL_ROM_LMP_8703B, 7 },
 		{ RTL_ROM_LMP_8822B, 8 },
 		{ RTL_ROM_LMP_8723B, 9 },	/* 8723D */
 		{ RTL_ROM_LMP_8821A, 10 },	/* 8821C */
@@ -587,6 +631,48 @@ static int btrtl_setup_rtl8723b(struct hci_dev *hdev,
 	return ret;
 }
 
+static bool rtl_has_chip_type(u16 lmp_subver)
+{
+	switch (lmp_subver) {
+	case RTL_ROM_LMP_8703B:
+		return true;
+	default:
+		break;
+	}
+
+	return  false;
+}
+
+static int rtl_read_chip_type(struct hci_dev *hdev, u8 *type)
+{
+	struct rtl_chip_type_evt *chip_type;
+	struct sk_buff *skb;
+	const unsigned char cmd_buf[] = {0x00, 0x94, 0xa0, 0x00, 0xb0};
+
+	/* Read RTL chip type command */
+	skb = __hci_cmd_sync(hdev, 0xfc61, 5, cmd_buf, HCI_INIT_TIMEOUT);
+	if (IS_ERR(skb)) {
+		rtl_dev_err(hdev, "Read chip type failed (%ld)",
+			    PTR_ERR(skb));
+		return PTR_ERR(skb);
+	}
+
+	chip_type = skb_pull_data(skb, sizeof(*chip_type));
+	if (!chip_type) {
+		rtl_dev_err(hdev, "RTL chip type event length mismatch");
+		kfree_skb(skb);
+		return -EIO;
+	}
+
+	rtl_dev_info(hdev, "chip_type status=%x type=%x",
+		     chip_type->status, chip_type->type);
+
+	*type = chip_type->type & 0x0f;
+
+	kfree_skb(skb);
+	return 0;
+}
+
 void btrtl_free(struct btrtl_device_info *btrtl_dev)
 {
 	kvfree(btrtl_dev->fw_data);
@@ -603,7 +689,7 @@ struct btrtl_device_info *btrtl_initialize(struct hci_dev *hdev,
 	struct hci_rp_read_local_version *resp;
 	char cfg_name[40];
 	u16 hci_rev, lmp_subver;
-	u8 hci_ver;
+	u8 hci_ver, chip_type = 0;
 	int ret;
 	u16 opcode;
 	u8 cmd[2];
@@ -629,8 +715,14 @@ struct btrtl_device_info *btrtl_initialize(struct hci_dev *hdev,
 	hci_rev = le16_to_cpu(resp->hci_rev);
 	lmp_subver = le16_to_cpu(resp->lmp_subver);
 
+	if (rtl_has_chip_type(lmp_subver)) {
+		ret = rtl_read_chip_type(hdev, &chip_type);
+		if (ret)
+			goto err_free;
+	}
+
 	btrtl_dev->ic_info = btrtl_match_ic(lmp_subver, hci_rev, hci_ver,
-					    hdev->bus);
+					    hdev->bus, chip_type);
 
 	if (!btrtl_dev->ic_info)
 		btrtl_dev->drop_fw = true;
@@ -673,7 +765,7 @@ struct btrtl_device_info *btrtl_initialize(struct hci_dev *hdev,
 		lmp_subver = le16_to_cpu(resp->lmp_subver);
 
 		btrtl_dev->ic_info = btrtl_match_ic(lmp_subver, hci_rev, hci_ver,
-						    hdev->bus);
+						    hdev->bus, chip_type);
 	}
 out_free:
 	kfree_skb(skb);
@@ -755,6 +847,7 @@ int btrtl_download_firmware(struct hci_dev *hdev,
 	case RTL_ROM_LMP_8761A:
 	case RTL_ROM_LMP_8822B:
 	case RTL_ROM_LMP_8852A:
+	case RTL_ROM_LMP_8703B:
 		return btrtl_setup_rtl8723b(hdev, btrtl_dev);
 	default:
 		rtl_dev_info(hdev, "assuming no firmware upload needed");
@@ -795,6 +888,19 @@ void btrtl_set_quirks(struct hci_dev *hdev, struct btrtl_device_info *btrtl_dev)
 		rtl_dev_dbg(hdev, "WBS supported not enabled.");
 		break;
 	}
+
+	switch (btrtl_dev->ic_info->lmp_subver) {
+	case RTL_ROM_LMP_8703B:
+		/* 8723CS reports two pages for local ext features,
+		 * but it doesn't support any features from page 2 -
+		 * it either responds with garbage or with error status
+		 */
+		set_bit(HCI_QUIRK_BROKEN_LOCAL_EXT_FEATURES_PAGE_2,
+			&hdev->quirks);
+		break;
+	default:
+		break;
+	}
 }
 EXPORT_SYMBOL_GPL(btrtl_set_quirks);
 
@@ -953,6 +1059,12 @@ MODULE_FIRMWARE("rtl_bt/rtl8723b_fw.bin");
 MODULE_FIRMWARE("rtl_bt/rtl8723b_config.bin");
 MODULE_FIRMWARE("rtl_bt/rtl8723bs_fw.bin");
 MODULE_FIRMWARE("rtl_bt/rtl8723bs_config.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8723cs_cg_fw.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8723cs_cg_config.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8723cs_vf_fw.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8723cs_vf_config.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8723cs_xx_fw.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8723cs_xx_config.bin");
 MODULE_FIRMWARE("rtl_bt/rtl8723ds_fw.bin");
 MODULE_FIRMWARE("rtl_bt/rtl8723ds_config.bin");
 MODULE_FIRMWARE("rtl_bt/rtl8761a_fw.bin");
diff --git a/drivers/bluetooth/btrtl.h b/drivers/bluetooth/btrtl.h
index ebf0101c959b..349d72ee571b 100644
--- a/drivers/bluetooth/btrtl.h
+++ b/drivers/bluetooth/btrtl.h
@@ -14,6 +14,11 @@
 
 struct btrtl_device_info;
 
+struct rtl_chip_type_evt {
+	__u8 status;
+	__u8 type;
+} __packed;
+
 struct rtl_download_cmd {
 	__u8 index;
 	__u8 data[RTL_FRAG_LEN];
diff --git a/drivers/bluetooth/hci_h5.c b/drivers/bluetooth/hci_h5.c
index 6455bc4fb5bb..e90670955df2 100644
--- a/drivers/bluetooth/hci_h5.c
+++ b/drivers/bluetooth/hci_h5.c
@@ -936,6 +936,8 @@ static int h5_btrtl_setup(struct h5 *h5)
 	err = btrtl_download_firmware(h5->hu->hdev, btrtl_dev);
 	/* Give the device some time before the hci-core sends it a reset */
 	usleep_range(10000, 20000);
+	if (err)
+		goto out_free;
 
 	btrtl_set_quirks(h5->hu->hdev, btrtl_dev);
 
@@ -1100,6 +1102,8 @@ static const struct of_device_id rtl_bluetooth_of_match[] = {
 	  .data = (const void *)&h5_data_rtl8822cs },
 	{ .compatible = "realtek,rtl8723bs-bt",
 	  .data = (const void *)&h5_data_rtl8723bs },
+	{ .compatible = "realtek,rtl8723cs-bt",
+	  .data = (const void *)&h5_data_rtl8723bs },
 	{ .compatible = "realtek,rtl8723ds-bt",
 	  .data = (const void *)&h5_data_rtl8723bs },
 #endif
-- 
2.39.1

Re: [PATCH v5 0/2] Bluetooth: btrtl: add support for the RTL8723CS

[Bastian Germann]

Am 12.02.23 um 13:41 schrieb Bastian Germann:
> v1 of this series was sent in July 2020 by Vasily Khoruzhick.
> I have tested it to work on the Pinebook.
> 
> Changelog:
> v2:
>     * Rebase
>     * Add uart-has-rtscts to device tree as requested by reviewer
> v3:
>     * Drop the device tree as it was split out and is already integrated.
>     * Rename the quirk as requested by reviewer Marcel Holtmann
> v4:
>     * Use skb_pull_data as requested by reviewer Luiz Augusto von Dentz
> v5:
>     * Make use of skb_pull_data's length check

I have addressed every comment.
Would you please consider integrating this 2.5 years old series?