Author: wulf
Date: Sun Nov 3 21:04:51 2019
New Revision: 354312
URL: https://svnweb.freebsd.org/changeset/base/354312
Log:
[ig4] Use interrupts for waiting for empty 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 21:03:55 2019
(r354311)
+++ head/sys/dev/ichiic/ig4_iic.c Sun Nov 3 21:04:51 2019
(r354312)
@@ -252,6 +252,14 @@ wait_status(ig4iic_softc_t *sc, uint32_t status)
set_intr_mask(sc, 0);
mtx_unlock(&sc->io_lock);
count_us += 10000;
+ } else if ((status & IG4_STATUS_TX_EMPTY) && !DO_POLL(sc)) {
+ mtx_lock(&sc->io_lock);
+ set_intr_mask(sc, IG4_INTR_TX_EMPTY);
+ mtx_sleep(sc, &sc->io_lock, 0, "i2cwait",
+ (hz + 99) / 100); /* sleep up to 10ms */
+ set_intr_mask(sc, 0);
+ mtx_unlock(&sc->io_lock);
+ count_us += 10000;
} else {
DELAY(25);
count_us += 25;
@@ -861,6 +869,7 @@ ig4iic_set_config(ig4iic_softc_t *sc)
* See ig4_var.h for details on interrupt handler synchronization.
*/
reg_write(sc, IG4_REG_RX_TL, 0);
+ reg_write(sc, IG4_REG_TX_TL, 0);
reg_write(sc, IG4_REG_CTL,
IG4_CTL_MASTER |
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