Bluetooth: btqca: inject command complete event during fw download

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>
Tested-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --git a/drivers/bluetooth/btqca.c b/drivers/bluetooth/btqca.c
index aff1d22..6ce5c88 100644 (file)
--- a/drivers/bluetooth/btqca.c
+++ b/drivers/bluetooth/btqca.c
@@ -131,6 +131,7 @@ 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));
@@ -251,6 +252,31 @@ out:
        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 = QCA_HCI_CC_OPCODE;
+
+       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)
 {
@@ -284,11 +310,22 @@ 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 e9c9999..03fdec2 100644 (file)
--- a/drivers/bluetooth/btqca.h
+++ b/drivers/bluetooth/btqca.h
@@ -28,6 +28,9 @@
 #define QCA_WCN3990_POWERON_PULSE      0xFC
 #define QCA_WCN3990_POWEROFF_PULSE     0xC0
 
+#define QCA_HCI_CC_OPCODE              0xFC00
+#define QCA_HCI_CC_SUCCESS             0x00
+
 enum qca_baudrate {
        QCA_BAUDRATE_115200     = 0,
        QCA_BAUDRATE_57600,
@@ -69,6 +72,7 @@ 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 {