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| author | Sourav Poddar <sourav.poddar@ti.com> | 2013-12-21 12:50:10 +0530 |
|---|---|---|
| committer | Jagannadha Sutradharudu Teki <jaganna@xilinx.com> | 2014-02-18 22:41:09 +0530 |
| commit | bb7cd0ddf978b96c40a4889608c9b9ea16127afa (patch) | |
| tree | 6ab11c37a167dabf49b39c0edcde59292e6035c0 /drivers | |
| parent | 570533b820fb4cc2bbe34c44001cc4c371617e37 (diff) | |
| download | talos-obmc-uboot-bb7cd0ddf978b96c40a4889608c9b9ea16127afa.tar.gz talos-obmc-uboot-bb7cd0ddf978b96c40a4889608c9b9ea16127afa.zip | |
spi: ti_qspi: Add delay before xfer for am43xx
Without this delay, write/read is failing.
Looks like, the WIP always remain set and hence a timeout
occurs leading to the error.
Without this patch, device does not get probed also.
Here is the log.
U-Boot#
U-Boot#
U-Boot#
U-Boot# sf probe 0
SF: Unsupported flash IDs: manuf ff, jedec ffff, ext_jedec ffff
Failed to initialize SPI flash at 0:0
U-Boot# sf probe 0
While with this patch, log is
U-Boot# sf probe 0
SF: Detected MX25L51235F with page size 256 Bytes, erase size 64 KiB, total 64 MiB, mapped at 30000000
U-Boot# sf erase 0 0x80000
SF: 524288 bytes @ 0x0 Erased: OK
U-Boot# mw 81000000 0xdededede 0x40000
U-Boot# sf write 81000000 0 0x40000
SF: 262144 bytes @ 0x0 Written: OK
U-Boot# sf read 82000000 0 0x40000
SF: 262144 bytes @ 0x0 Read: OK
U-Boot# md 0x82000000
Signed-off-by: Sourav Poddar <sourav.poddar@ti.com>
Reviewed-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/spi/ti_qspi.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/spi/ti_qspi.c b/drivers/spi/ti_qspi.c index 5666250912..dfa5d0ca21 100644 --- a/drivers/spi/ti_qspi.c +++ b/drivers/spi/ti_qspi.c @@ -285,6 +285,13 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout, qslave->cmd |= QSPI_3_PIN; qslave->cmd |= 0xfff; +/* FIXME: This delay is required for successfull + * completion of read/write/erase. Once its root + * caused, it will be remove from the driver. + */ +#ifdef CONFIG_AM43XX + udelay(100); +#endif while (words--) { if (txp) { debug("tx cmd %08x dc %08x data %02x\n", |
