Since commit 43c145b8b3ee ("spi: ich: Correct max-size bug in ich_spi_adjust_size()") (in v2020.04-rc1), SPI flash read no longer works with ICH SPI controller in software sequencer mode.

ICH controller can only transfer a small number of bytes at once. Before commit 43c145b8b3ee, the logic happens to make sure data.nbytes is limited to slave->max_write_size but after commit 43c145b8b3ee data.nbytes is no longer limited because slave->max_read_size is not initialized with a valid number.

Fixes: 43c145b8b3ee ("spi: ich: Correct max-size bug in ich_spi_adjust_size()") Signed-off-by: Bin Meng bmeng.cn@gmail.com ---

drivers/spi/ich.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/ich.c b/drivers/spi/ich.c index 3d49c22a9d..08d54e86f4 100644 --- a/drivers/spi/ich.c +++ b/drivers/spi/ich.c @@ -918,12 +918,14 @@ static int ich_spi_child_pre_probe(struct udevice *dev) struct spi_slave *slave = dev_get_parent_priv(dev);

/* - * Yes this controller can only write a small number of bytes at + * Yes this controller can only transfer a small number of bytes at * once! The limit is typically 64 bytes. For hardware sequencing a * a loop is used to get around this. */ - if (!plat->hwseq) + if (!plat->hwseq) { + slave->max_read_size = priv->databytes; slave->max_write_size = priv->databytes; + } /* * ICH 7 SPI controller only supports array read command * and byte program command for SST flash