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| author | Chin Liang See <clsee@altera.com> | 2015-10-17 08:31:55 -0500 |
|---|---|---|
| committer | Marek Vasut <marex@denx.de> | 2015-11-05 02:34:15 +0100 |
| commit | 98fbd71d7a4492e23377b8753cfd77add26c63ec (patch) | |
| tree | 34e595244b6184436c416d772f2593a93684fc04 /drivers/spi | |
| parent | bfa3e55b440e120739d2b4dd4cb57e6b40752113 (diff) | |
| download | talos-obmc-uboot-98fbd71d7a4492e23377b8753cfd77add26c63ec.tar.gz talos-obmc-uboot-98fbd71d7a4492e23377b8753cfd77add26c63ec.zip | |
spi: cadence_qspi: Ensure spi_calibration is run when sclk change
Ensuring spi_calibration is run when there is a change of sclk
frequency. This will ensure the qspi flash access works for high
sclk frequency
Signed-off-by: Chin Liang See <clsee@altera.com>
Cc: Dinh Nguyen <dinguyen@opensource.altera.com>
Cc: Dinh Nguyen <dinh.linux@gmail.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Stefan Roese <sr@denx.de>
Cc: Vikas Manocha <vikas.manocha@st.com>
Cc: Jagannadh Teki <jteki@openedev.com>
Cc: Pavel Machek <pavel@denx.de>
Acked-by: Marek Vasut <marex@denx.de>
Reviewed-by: Jagan Teki <jteki@openedev.com>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/cadence_qspi.c | 22 | ||||
| -rw-r--r-- | drivers/spi/cadence_qspi.h | 1 |
2 files changed, 14 insertions, 9 deletions
diff --git a/drivers/spi/cadence_qspi.c b/drivers/spi/cadence_qspi.c index 34a0f46a1a..c5a427698e 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; @@ -126,14 +125,19 @@ static int cadence_spi_set_speed(struct udevice *bus, uint 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 */ diff --git a/drivers/spi/cadence_qspi.h b/drivers/spi/cadence_qspi.h index 98e57aa5bc..2912e36a53 100644 --- a/drivers/spi/cadence_qspi.h +++ b/drivers/spi/cadence_qspi.h @@ -38,6 +38,7 @@ struct cadence_spi_priv { int qspi_is_init; unsigned int qspi_calibrated_hz; unsigned int qspi_calibrated_cs; + unsigned int previous_hz; }; /* Functions call declaration */ |
