Bluetooth: Handle partial write during FW download

Handle partial write of packet during fw download to make sure
full packet is written.
Flush FD after baudrate change to remove leftover data.

Change-Id: If12727daae5f06b1607cf34c4ef29b46bbff5d9f

CRs-Fixed: 845058

2 files changed, 37 insertions, 7 deletions

diff --git a/libbt-vendor/src/hci_uart.c b/libbt-vendor/src/hci_uart.c
index ef58bee..0475c99 100644
--- a/libbt-vendor/src/hci_uart.c
+++ b/libbt-vendor/src/hci_uart.c
@@ -357,6 +357,7 @@ void userial_vendor_set_baud(uint8_t userial_baud)
     cfsetospeed(&vnd_userial.termios, tcio_baud);
     cfsetispeed(&vnd_userial.termios, tcio_baud);
     tcsetattr(vnd_userial.fd, TCSADRAIN, &vnd_userial.termios); /* don't change speed until last write done */
+    tcflush(vnd_userial.fd, TCIOFLUSH);
 }
 
 /*******************************************************************************
diff --git a/libbt-vendor/src/hw_rome.c b/libbt-vendor/src/hw_rome.c
index 6dcb183..3cf379e 100644
--- a/libbt-vendor/src/hw_rome.c
+++ b/libbt-vendor/src/hw_rome.c
@@ -87,6 +87,35 @@ extern uint8_t vnd_local_bd_addr[6];
 /*****************************************************************************
 **   Functions
 *****************************************************************************/
+int do_write(int fd, unsigned char *buf,int len)
+{
+    int ret = 0;
+    int write_offset = 0;
+    int write_len = len;
+    do {
+        ret = write(fd,buf+write_offset,write_len);
+        if (ret < 0)
+        {
+            ALOGE("%s, write failed ret = %d err = %s",__func__,ret,strerror(errno));
+            return -1;
+        } else if (ret == 0) {
+            ALOGE("%s, write failed with ret 0 err = %s",__func__,strerror(errno));
+            return 0;
+        } else {
+            if (ret < write_len) {
+                ALOGD("%s, Write pending,do write ret = %d err = %s",__func__,ret,
+                       strerror(errno));
+                write_len = write_len - ret;
+                write_offset = ret;
+            } else {
+                ALOGV("Write successful");
+                break;
+            }
+        }
+    } while(1);
+    return len;
+}
+
 int get_vs_hci_event(unsigned char *rsp)
 {
     int err = 0;
@@ -338,7 +367,7 @@ int hci_send_wipower_vs_cmd(int fd, unsigned char *cmd, unsigned char *rsp, int
     int err = 0;
 
     /* Send the HCI command packet to UART for transmission */
-    ret = write(fd, cmd, size);
+    ret = do_write(fd, cmd, size);
     if (ret != size) {
         ALOGE("%s: WP Send failed with ret value: %d", __FUNCTION__, ret);
         goto failed;
@@ -362,7 +391,7 @@ int hci_send_vs_cmd(int fd, unsigned char *cmd, unsigned char *rsp, int size)
     int ret = 0;
 
     /* Send the HCI command packet to UART for transmission */
-    ret = write(fd, cmd, size);
+    ret = do_write(fd, cmd, size);
     if (ret != size) {
         ALOGE("%s: Send failed with ret value: %d", __FUNCTION__, ret);
         goto failed;
@@ -761,7 +790,7 @@ int rome_rampatch_reset(int fd)
     size = (HCI_CMD_IND + HCI_COMMAND_HDR_SIZE + EDL_PATCH_CMD_LEN);
 
     /* Send HCI Command packet to Controller */
-    err = write(fd, cmd, size);
+    err = do_write(fd, cmd, size);
     if (err != size) {
         ALOGE("%s: Send failed with ret value: %d", __FUNCTION__, err);
         goto error;
@@ -1417,7 +1446,7 @@ int rome_set_baudrate_req(int fd)
     }
 
     /* Send the HCI command packet to UART for transmission */
-    err = write(fd, cmd, size);
+    err = do_write(fd, cmd, size);
     if (err != size) {
         ALOGE("%s: Send failed with ret value: %d", __FUNCTION__, err);
         goto error;
@@ -1483,7 +1512,7 @@ int rome_hci_reset_req(int fd)
 
     /* Send the HCI command packet to UART for transmission */
     ALOGI("%s: HCI CMD: 0x%x 0x%x 0x%x 0x%x\n", __FUNCTION__, cmd[0], cmd[1], cmd[2], cmd[3]);
-    err = write(fd, cmd, size);
+    err = do_write(fd, cmd, size);
     if (err != size) {
         ALOGE("%s: Send failed with ret value: %d", __FUNCTION__, err);
         goto error;
@@ -1531,7 +1560,7 @@ int rome_hci_reset(int fd)
 
     /* Total length of the packet to be sent to the Controller */
     size = (HCI_CMD_IND + HCI_COMMAND_HDR_SIZE);
-    err = write(fd, cmd, size);
+    err = do_write(fd, cmd, size);
     if (err != size) {
         ALOGE("%s: Send failed with ret value: %d", __FUNCTION__, err);
         err = -1;
@@ -1741,7 +1770,7 @@ static int disable_internal_ldo(int fd)
         unsigned char rsp[HCI_MAX_EVENT_SIZE];
 
         ALOGI(" %s ", __FUNCTION__);
-        ret = write(fd, cmd, 5);
+        ret = do_write(fd, cmd, 5);
         if (ret != 5) {
             ALOGE("%s: Send failed with ret value: %d", __FUNCTION__, ret);
             ret = -1;