diff options
Diffstat (limited to 'drivers/spi/cadence_qspi.c')
| -rw-r--r-- | drivers/spi/cadence_qspi.c | 33 |
1 files changed, 20 insertions, 13 deletions
diff --git a/drivers/spi/cadence_qspi.c b/drivers/spi/cadence_qspi.c index 34a0f46..4f7fd52 100644 --- a/drivers/spi/cadence_qspi.c +++ b/drivers/spi/cadence_qspi.c @@ -37,9 +37,8 @@ static int cadence_spi_write_speed(struct udevice *bus, uint hz) } /* Calibration sequence to determine the read data capture delay register */ -static int spi_calibration(struct udevice *bus) +static int spi_calibration(struct udevice *bus, uint hz) { - struct cadence_spi_platdata *plat = bus->platdata; struct cadence_spi_priv *priv = dev_get_priv(bus); void *base = priv->regbase; u8 opcode_rdid = 0x9F; @@ -64,7 +63,7 @@ static int spi_calibration(struct udevice *bus) } /* use back the intended clock and find low range */ - cadence_spi_write_speed(bus, plat->max_hz); + cadence_spi_write_speed(bus, hz); for (i = 0; i < CQSPI_READ_CAPTURE_MAX_DELAY; i++) { /* Disable QSPI */ cadence_qspi_apb_controller_disable(base); @@ -111,7 +110,7 @@ static int spi_calibration(struct udevice *bus) (range_hi + range_lo) / 2, range_lo, range_hi); /* just to ensure we do once only when speed or chip select change */ - priv->qspi_calibrated_hz = plat->max_hz; + priv->qspi_calibrated_hz = hz; priv->qspi_calibrated_cs = spi_chip_select(bus); return 0; @@ -123,17 +122,25 @@ static int cadence_spi_set_speed(struct udevice *bus, uint hz) struct cadence_spi_priv *priv = dev_get_priv(bus); int err; + if (hz > plat->max_hz) + hz = plat->max_hz; + /* Disable QSPI */ cadence_qspi_apb_controller_disable(priv->regbase); - cadence_spi_write_speed(bus, hz); - - /* Calibration required for different SCLK speed or chip select */ - if (priv->qspi_calibrated_hz != plat->max_hz || + /* + * Calibration required for different current SCLK speed, requested + * SCLK speed or chip select + */ + if (priv->previous_hz != hz || + priv->qspi_calibrated_hz != hz || priv->qspi_calibrated_cs != spi_chip_select(bus)) { - err = spi_calibration(bus); + err = spi_calibration(bus, hz); if (err) return err; + + /* prevent calibration run when same as previous request */ + priv->previous_hz = hz; } /* Enable QSPI */ @@ -291,10 +298,6 @@ static int cadence_spi_ofdata_to_platdata(struct udevice *bus) plat->regbase = (void *)data[0]; plat->ahbbase = (void *)data[2]; - /* Use 500KHz as a suitable default */ - plat->max_hz = fdtdec_get_int(blob, node, "spi-max-frequency", - 500000); - /* All other paramters are embedded in the child node */ subnode = fdt_first_subnode(blob, node); if (subnode < 0) { @@ -302,6 +305,10 @@ static int cadence_spi_ofdata_to_platdata(struct udevice *bus) return -ENODEV; } + /* Use 500 KHz as a suitable default */ + plat->max_hz = fdtdec_get_uint(blob, subnode, "spi-max-frequency", + 500000); + /* Read other parameters from DT */ plat->page_size = fdtdec_get_int(blob, subnode, "page-size", 256); plat->block_size = fdtdec_get_int(blob, subnode, "block-size", 16); |