From: "Poddar, Sourav" sourav.poddar@ti.com
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 --- v1->v2: - updated commit log with error message. - Add a FIXME comment in code, 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 5666250..dfa5d0c 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",