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| author | David S. Miller <davem@davemloft.net> | 2021-05-10 14:29:18 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-05-10 14:29:18 -0700 |
| commit | 3f8fca5d43357ab3ae678d908ac3c74e07503f0d (patch) | |
| tree | c9864c109332a00bff1d966780d65931a2b73c3a | |
| parent | 48de7c0c1c9225b478c602184be8e00b92b35c61 (diff) | |
| parent | a53935674563f60d8e22ca88ab607dac89fb353d (diff) | |
| download | linux-3f8fca5d43357ab3ae678d908ac3c74e07503f0d.tar.bz2 | |
Merge branch 'qca_spi-sync'
Stefan Wahren says:
====================
net: qca_spi: Improve sync handling
This small patch series contains some improvements of the sync
handling. This was discovered while the QCA7000 was doing SLAC
(Signal Level Attenuation Characterization).
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/ethernet/qualcomm/qca_debug.c | 1 | ||||
| -rw-r--r-- | drivers/net/ethernet/qualcomm/qca_spi.c | 10 | ||||
| -rw-r--r-- | drivers/net/ethernet/qualcomm/qca_spi.h | 1 |
3 files changed, 11 insertions, 1 deletions
diff --git a/drivers/net/ethernet/qualcomm/qca_debug.c b/drivers/net/ethernet/qualcomm/qca_debug.c index 702aa217a27a..d59fff2fbcc6 100644 --- a/drivers/net/ethernet/qualcomm/qca_debug.c +++ b/drivers/net/ethernet/qualcomm/qca_debug.c @@ -62,6 +62,7 @@ static const char qcaspi_gstrings_stats[][ETH_GSTRING_LEN] = { "SPI errors", "Write verify errors", "Buffer available errors", + "Bad signature", }; #ifdef CONFIG_DEBUG_FS diff --git a/drivers/net/ethernet/qualcomm/qca_spi.c b/drivers/net/ethernet/qualcomm/qca_spi.c index ab9b02574a15..79fe3ec4e581 100644 --- a/drivers/net/ethernet/qualcomm/qca_spi.c +++ b/drivers/net/ethernet/qualcomm/qca_spi.c @@ -504,8 +504,12 @@ qcaspi_qca7k_sync(struct qcaspi *qca, int event) qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature); qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature); if (signature != QCASPI_GOOD_SIGNATURE) { + if (qca->sync == QCASPI_SYNC_READY) + qca->stats.bad_signature++; + qca->sync = QCASPI_SYNC_UNKNOWN; netdev_dbg(qca->net_dev, "sync: got CPU on, but signature was invalid, restart\n"); + return; } else { /* ensure that the WRBUF is empty */ qcaspi_read_register(qca, SPI_REG_WRBUF_SPC_AVA, @@ -523,10 +527,14 @@ qcaspi_qca7k_sync(struct qcaspi *qca, int event) switch (qca->sync) { case QCASPI_SYNC_READY: - /* Read signature, if not valid go to unknown state. */ + /* Check signature twice, if not valid go to unknown state. */ qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature); + if (signature != QCASPI_GOOD_SIGNATURE) + qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature); + if (signature != QCASPI_GOOD_SIGNATURE) { qca->sync = QCASPI_SYNC_UNKNOWN; + qca->stats.bad_signature++; netdev_dbg(qca->net_dev, "sync: bad signature, restart\n"); /* don't reset right away */ return; diff --git a/drivers/net/ethernet/qualcomm/qca_spi.h b/drivers/net/ethernet/qualcomm/qca_spi.h index d13a67e20d65..3067356106f0 100644 --- a/drivers/net/ethernet/qualcomm/qca_spi.h +++ b/drivers/net/ethernet/qualcomm/qca_spi.h @@ -75,6 +75,7 @@ struct qcaspi_stats { u64 spi_err; u64 write_verify_failed; u64 buf_avail_err; + u64 bad_signature; }; struct qcaspi { |