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Subject[PATCH v6 6/6] Bluetooth: btqca: inject command complete event during fw download
Date
Latest qualcomm chips are not sending an command complete event for
every firmware packet sent to chip. They only respond with a vendor
specific event for the last firmware packet. This optimization will
decrease the BT ON time. Due to this we are seeing a timeout error
message logs on the console during firmware download. Now we are
injecting a command complete event once we receive an vendor specific
event for the last RAM firmware packet.

Signed-off-by: Balakrishna Godavarthi <bgodavar@codeaurora.org>
---
drivers/bluetooth/btqca.c | 39 ++++++++++++++++++++++++++++++++++++++-
drivers/bluetooth/btqca.h | 3 +++
2 files changed, 41 insertions(+), 1 deletion(-)

diff --git a/drivers/bluetooth/btqca.c b/drivers/bluetooth/btqca.c
index ec9e03a6b778..0b533f65f652 100644
--- a/drivers/bluetooth/btqca.c
+++ b/drivers/bluetooth/btqca.c
@@ -144,6 +144,7 @@ static void qca_tlv_check_data(struct rome_config *config,
* In case VSE is skipped, only the last segment is acked.
*/
config->dnld_mode = tlv_patch->download_mode;
+ config->dnld_type = config->dnld_mode;

BT_DBG("Total Length : %d bytes",
le32_to_cpu(tlv_patch->total_size));
@@ -264,6 +265,31 @@ static int qca_tlv_send_segment(struct hci_dev *hdev, int seg_size,
return err;
}

+static int qca_inject_cmd_complete_event(struct hci_dev *hdev)
+{
+ struct hci_event_hdr *hdr;
+ struct hci_ev_cmd_complete *evt;
+ struct sk_buff *skb;
+
+ skb = bt_skb_alloc(sizeof(*hdr) + sizeof(*evt) + 1, GFP_KERNEL);
+ if (!skb)
+ return -ENOMEM;
+
+ hdr = skb_put(skb, sizeof(*hdr));
+ hdr->evt = HCI_EV_CMD_COMPLETE;
+ hdr->plen = sizeof(*evt) + 1;
+
+ evt = skb_put(skb, sizeof(*evt));
+ evt->ncmd = 1;
+ evt->opcode = HCI_OP_NOP;
+
+ skb_put_u8(skb, QCA_HCI_CC_SUCCESS);
+
+ hci_skb_pkt_type(skb) = HCI_EVENT_PKT;
+
+ return hci_recv_frame(hdev, skb);
+}
+
static int qca_download_firmware(struct hci_dev *hdev,
struct rome_config *config)
{
@@ -297,11 +323,22 @@ static int qca_download_firmware(struct hci_dev *hdev,
ret = qca_tlv_send_segment(hdev, segsize, segment,
config->dnld_mode);
if (ret)
- break;
+ goto out;

segment += segsize;
}

+ /* Latest qualcomm chipsets are not sending a command complete event
+ * for every fw packet sent. They only respond with a vendor specific
+ * event for the last packet. This optimization in the chip will
+ * decrease the BT in initialization time. Here we will inject a command
+ * complete event to avoid a command timeout error message.
+ */
+ if ((config->dnld_type == ROME_SKIP_EVT_VSE_CC ||
+ config->dnld_type == ROME_SKIP_EVT_VSE))
+ return qca_inject_cmd_complete_event(hdev);
+
+out:
release_firmware(fw);

return ret;
diff --git a/drivers/bluetooth/btqca.h b/drivers/bluetooth/btqca.h
index 0c01f375fe83..5c8fc54133e3 100644
--- a/drivers/bluetooth/btqca.h
+++ b/drivers/bluetooth/btqca.h
@@ -40,6 +40,8 @@
#define QCA_WCN3990_POWERON_PULSE 0xFC
#define QCA_WCN3990_POWEROFF_PULSE 0xC0

+#define QCA_HCI_CC_SUCCESS 0x00
+
enum qca_bardrate {
QCA_BAUDRATE_115200 = 0,
QCA_BAUDRATE_57600,
@@ -81,6 +83,7 @@ struct rome_config {
char fwname[64];
uint8_t user_baud_rate;
enum rome_tlv_dnld_mode dnld_mode;
+ enum rome_tlv_dnld_mode dnld_type;
};

struct edl_event_hdr {
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
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