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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-09-11 04:34:46 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-09-11 04:34:46 -0300
commit863981e96738983919de841ec669e157e6bdaeb0 (patch)
treed6d89a12e7eb8017837c057935a2271290907f76 /drivers/spi/spi-fsl-espi.c
parent8dec7c70575785729a6a9e6719a955e9c545bcab (diff)
Linux-libre 4.7.1-gnupck-4.7.1-gnu
Diffstat (limited to 'drivers/spi/spi-fsl-espi.c')
-rw-r--r--drivers/spi/spi-fsl-espi.c30
1 files changed, 25 insertions, 5 deletions
diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 7cb0c1921..8d85a3c34 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -245,7 +245,12 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
if (ret)
return ret;
- wait_for_completion(&mpc8xxx_spi->done);
+ /* Won't hang up forever, SPI bus sometimes got lost interrupts... */
+ ret = wait_for_completion_timeout(&mpc8xxx_spi->done, 2 * HZ);
+ if (ret == 0)
+ dev_err(mpc8xxx_spi->dev,
+ "Transaction hanging up (left %d bytes)\n",
+ mpc8xxx_spi->count);
/* disable rx ints */
mpc8xxx_spi_write_reg(&reg_base->mask, 0);
@@ -539,16 +544,31 @@ void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
if (events & SPIE_NE) {
u32 rx_data, tmp;
u8 rx_data_8;
+ int rx_nr_bytes = 4;
+ int ret;
/* Spin until RX is done */
- while (SPIE_RXCNT(events) < min(4, mspi->len)) {
- cpu_relax();
- events = mpc8xxx_spi_read_reg(&reg_base->event);
+ if (SPIE_RXCNT(events) < min(4, mspi->len)) {
+ ret = spin_event_timeout(
+ !(SPIE_RXCNT(events =
+ mpc8xxx_spi_read_reg(&reg_base->event)) <
+ min(4, mspi->len)),
+ 10000, 0); /* 10 msec */
+ if (!ret)
+ dev_err(mspi->dev,
+ "tired waiting for SPIE_RXCNT\n");
}
if (mspi->len >= 4) {
rx_data = mpc8xxx_spi_read_reg(&reg_base->receive);
+ } else if (mspi->len <= 0) {
+ dev_err(mspi->dev,
+ "unexpected RX(SPIE_NE) interrupt occurred,\n"
+ "(local rxlen %d bytes, reg rxlen %d bytes)\n",
+ min(4, mspi->len), SPIE_RXCNT(events));
+ rx_nr_bytes = 0;
} else {
+ rx_nr_bytes = mspi->len;
tmp = mspi->len;
rx_data = 0;
while (tmp--) {
@@ -559,7 +579,7 @@ void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
rx_data <<= (4 - mspi->len) * 8;
}
- mspi->len -= 4;
+ mspi->len -= rx_nr_bytes;
if (mspi->rx)
mspi->get_rx(rx_data, mspi);