i2c: bfin-twi: Read and write the FIFO in loop
TWI transfer interrupts may be lost when system is heavily handling other
interrupts, while current transfer handler depends on each accurate interrupt
and misses some data in this case. Because there are 2 2-byte FIFOs in blackfin
TWI controller, the occurrence of the data loss can be reduced by reading till
the RX FIFO is empty and writing till the TX FIFO is full.
Reported-by: Bob Maris <mail@maris-ee.eu>
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
diff --git a/drivers/i2c/busses/i2c-bfin-twi.c b/drivers/i2c/busses/i2c-bfin-twi.c
index 05080c4..13ea1c2 100644
--- a/drivers/i2c/busses/i2c-bfin-twi.c
+++ b/drivers/i2c/busses/i2c-bfin-twi.c
@@ -39,33 +39,40 @@
unsigned short mast_stat = read_MASTER_STAT(iface);
if (twi_int_status & XMTSERV) {
+ if (iface->writeNum <= 0) {
+ /* start receive immediately after complete sending in
+ * combine mode.
+ */
+ if (iface->cur_mode == TWI_I2C_MODE_COMBINED)
+ write_MASTER_CTL(iface,
+ read_MASTER_CTL(iface) | MDIR);
+ else if (iface->manual_stop)
+ write_MASTER_CTL(iface,
+ read_MASTER_CTL(iface) | STOP);
+ else if (iface->cur_mode == TWI_I2C_MODE_REPEAT &&
+ iface->cur_msg + 1 < iface->msg_num) {
+ if (iface->pmsg[iface->cur_msg + 1].flags &
+ I2C_M_RD)
+ write_MASTER_CTL(iface,
+ read_MASTER_CTL(iface) |
+ MDIR);
+ else
+ write_MASTER_CTL(iface,
+ read_MASTER_CTL(iface) &
+ ~MDIR);
+ }
+ }
/* Transmit next data */
- if (iface->writeNum > 0) {
+ while (iface->writeNum > 0 &&
+ (read_FIFO_STAT(iface) & XMTSTAT) != XMT_FULL) {
SSYNC();
write_XMT_DATA8(iface, *(iface->transPtr++));
iface->writeNum--;
}
- /* start receive immediately after complete sending in
- * combine mode.
- */
- else if (iface->cur_mode == TWI_I2C_MODE_COMBINED)
- write_MASTER_CTL(iface,
- read_MASTER_CTL(iface) | MDIR);
- else if (iface->manual_stop)
- write_MASTER_CTL(iface,
- read_MASTER_CTL(iface) | STOP);
- else if (iface->cur_mode == TWI_I2C_MODE_REPEAT &&
- iface->cur_msg + 1 < iface->msg_num) {
- if (iface->pmsg[iface->cur_msg + 1].flags & I2C_M_RD)
- write_MASTER_CTL(iface,
- read_MASTER_CTL(iface) | MDIR);
- else
- write_MASTER_CTL(iface,
- read_MASTER_CTL(iface) & ~MDIR);
- }
}
if (twi_int_status & RCVSERV) {
- if (iface->readNum > 0) {
+ while (iface->readNum > 0 &&
+ (read_FIFO_STAT(iface) & RCVSTAT)) {
/* Receive next data */
*(iface->transPtr) = read_RCV_DATA8(iface);
if (iface->cur_mode == TWI_I2C_MODE_COMBINED) {