Author: wulf
Date: Sun Nov 3 21:03:07 2019
New Revision: 354310
URL: https://svnweb.freebsd.org/changeset/base/354310
Log:
[ig4] Rewrite ig4iic_write routine to use TX_EMPTY status flag
rather than TX_NOTFULL. It makes possible interrupt utilization while
waiting for empty space in TX FIFO.
Modified:
head/sys/dev/ichiic/ig4_iic.c
Modified: head/sys/dev/ichiic/ig4_iic.c
==============================================================================
--- head/sys/dev/ichiic/ig4_iic.c Sun Nov 3 21:01:53 2019
(r354309)
+++ head/sys/dev/ichiic/ig4_iic.c Sun Nov 3 21:03:07 2019
(r354310)
@@ -384,21 +384,31 @@ ig4iic_write(ig4iic_softc_t *sc, uint8_t *buf, uint16_
bool repeated_start, bool stop)
{
uint32_t cmd;
- uint16_t i;
+ int sent = 0;
+ int burst, target;
int error;
if (len == 0)
return (0);
- cmd = repeated_start ? IG4_DATA_RESTART : 0;
- for (i = 0; i < len; i++) {
- error = wait_status(sc, IG4_STATUS_TX_NOTFULL);
- if (error)
- break;
- cmd |= buf[i];
- cmd |= stop && i == len - 1 ? IG4_DATA_STOP : 0;
- reg_write(sc, IG4_REG_DATA_CMD, cmd);
- cmd = 0;
+ while (sent < len) {
+ burst = sc->cfg.txfifo_depth -
+ (reg_read(sc, IG4_REG_TXFLR) & IG4_FIFOLVL_MASK);
+ target = MIN(sent + burst, (int)len);
+ while(sent < target) {
+ cmd = buf[sent];
+ if (repeated_start && sent == 0)
+ cmd |= IG4_DATA_RESTART;
+ if (stop && sent == len - 1)
+ cmd |= IG4_DATA_STOP;
+ reg_write(sc, IG4_REG_DATA_CMD, cmd);
+ sent++;
+ }
+ if (sent < len) {
+ error = wait_status(sc, IG4_STATUS_TX_EMPTY);
+ if (error)
+ break;
+ }
}
(void)reg_read(sc, IG4_REG_TX_ABRT_SOURCE);
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