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serial: send entire command in one write if send_delay is 0 (chromium:13506)

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Avoids additional USB latency and groups the whole command into one
USB packet.

BUG=chromium-os:13506
This commit is contained in:
Dan Williams
2011-04-08 15:42:28 -05:00
parent 2640baefa4
commit 273f4203d4
2 changed files with 21 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/mm-serial-port.c
+17 -7
View File
@@ -373,7 +373,7 @@ mm_serial_port_process_command (MMSerialPort *self,
{
MMSerialPortPrivate *priv = MM_SERIAL_PORT_GET_PRIVATE (self);
const guint8 *p;
int status;
int status, expected_status, send_len;
if (priv->fd < 0) {
g_set_error_literal (error, MM_SERIAL_ERROR, MM_SERIAL_ERROR_SEND_FAILED,
@@ -393,14 +393,24 @@ mm_serial_port_process_command (MMSerialPort *self,
serial_debug (self, "-->", (const char *) info->command->data, info->command->len);
}
if (priv->send_delay == 0) {
/* Send the whole command in one write */
send_len = expected_status = info->command->len;
p = info->command->data;
} else {
/* Send just one byte of the command */
send_len = expected_status = 1;
p = &info->command->data[info->idx];
}
/* Send a single byte of the command */
p = &info->command->data[info->idx];
errno = 0;
status = write (priv->fd, p, 1);
if (status == 1)
info->idx++;
else if (status < 0) {
if (errno == EAGAIN) {
status = write (priv->fd, p, send_len);
if (status > 0)
info->idx += status;
else {
/* Error or no bytes written */
if (errno == EAGAIN || status == 0) {
info->eagain_count--;
if (info->eagain_count <= 0) {
g_set_error (error, MM_SERIAL_ERROR, MM_SERIAL_ERROR_SEND_FAILED,