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spi: fsi: Batch TX operations

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Batch sequential write transfers up to the max TX size (40 bytes).
This controller must specify a max transfer size of only 8 bytes for
RX operations.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
Link: https://patch.msgid.link/20250131200158.732898-1-eajames@linux.ibm.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Eddie James 2025-01-31 14:01:58 -06:00 committed by Mark Brown
parent 26a756fc10
commit 652ffad172
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GPG Key ID: 24D68B725D5487D0
1 changed files with 13 additions and 0 deletions
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13
drivers/spi/spi-fsi.c
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@ -479,6 +479,19 @@ static int fsi_spi_transfer_one_message(struct spi_controller *ctlr,
shift = SPI_FSI_SEQUENCE_SHIFT_IN(next->len);
fsi_spi_sequence_add(&seq, shift);
} else if (next->tx_buf) {
if ((next->len + transfer->len) > (SPI_FSI_MAX_TX_SIZE + 8)) {
rc = -EINVAL;
goto error;
}
len = next->len;
while (len > 8) {
fsi_spi_sequence_add(&seq,
SPI_FSI_SEQUENCE_SHIFT_OUT(8));
len -= 8;
}
fsi_spi_sequence_add(&seq, SPI_FSI_SEQUENCE_SHIFT_OUT(len));
} else {
next = NULL;
}