From: Bin Meng <bin.m...@windriver.com>
For the ECSPIx_CONREG register BURST_LENGTH field, the manual says:
0x020 A SPI burst contains the 1 LSB in first word and all 32 bits in second
word.
0x021 A SPI burst contains the 2 LSB in first word and all 32 bits in second
word.
Current logic uses either s->burst_length or 32, whichever smaller,
to determine how many bits it should read from the tx fifo each time.
For example, for a 48 bit burst length, current logic transfers the
first 32 bit from the first word in the tx fifo, followed by a 16
bit from the second word in the tx fifo, which is wrong. The correct
logic should be: transfer the first 16 bit from the first word in
the tx fifo, followed by a 32 bit from the second word in the tx fifo.
With this change, SPI flash can be successfully probed by U-Boot on
imx6 sabrelite board.
=> sf probe
SF: Detected sst25vf016b with page size 256 Bytes, erase size 4 KiB, total 2
MiB
Fixes: c906a3a01582 ("i.MX: Add the Freescale SPI Controller")
Signed-off-by: Bin Meng <bin.m...@windriver.com>
Reviewed-by: Philippe Mathieu-Daudé <f4...@amsat.org>
Message-id: 20210129132323.30946-10-bmeng...@gmail.com
Signed-off-by: Peter Maydell <peter.mayd...@linaro.org>
---
hw/ssi/imx_spi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/hw/ssi/imx_spi.c b/hw/ssi/imx_spi.c
index 41fe199c9f1..a34194c1b06 100644
--- a/hw/ssi/imx_spi.c
+++ b/hw/ssi/imx_spi.c
@@ -185,7 +185,7 @@ static void imx_spi_flush_txfifo(IMXSPIState *s)
DPRINTF("data tx:0x%08x\n", tx);
- tx_burst = MIN(s->burst_length, 32);
+ tx_burst = (s->burst_length % 32) ? : 32;
rx = 0;
--
2.20.1
