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spi: npcm-pspi: fix 16 bit send and receive support

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Fixing NPCM BMC Peripheral SPI controller 16 bit
send and receive support by writing and reading
the SPI data in the right order.

Signed-off-by: Tomer Maimon <tmaimon77@gmail.com>
Link: https://lore.kernel.org/r/20200115162301.235926-2-tmaimon77@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Tomer Maimon 2020-01-15 18:22:58 +02:00 committed by Mark Brown
parent 6157d4c255
commit 47416a5f27
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 9 additions and 8 deletions
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17
drivers/spi/spi-npcm-pspi.c
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@ -195,6 +195,7 @@ static void npcm_pspi_setup_transfer(struct spi_device *spi,
static void npcm_pspi_send(struct npcm_pspi *priv)
{
int wsize;
u16 val;
wsize = min(bytes_per_word(priv->bits_per_word), priv->tx_bytes);
priv->tx_bytes -= wsize;
@ -204,17 +205,18 @@ static void npcm_pspi_send(struct npcm_pspi *priv)
switch (wsize) {
case 1:
iowrite8(*priv->tx_buf, NPCM_PSPI_DATA + priv->base);
val = *priv->tx_buf++;
iowrite8(val, NPCM_PSPI_DATA + priv->base);
break;
case 2:
iowrite16(*priv->tx_buf, NPCM_PSPI_DATA + priv->base);
val = *priv->tx_buf++;
val = *priv->tx_buf++ | (val << 8);
iowrite16(val, NPCM_PSPI_DATA + priv->base);
break;
default:
WARN_ON_ONCE(1);
return;
}
priv->tx_buf += wsize;
}
static void npcm_pspi_recv(struct npcm_pspi *priv)
@ -230,18 +232,17 @@ static void npcm_pspi_recv(struct npcm_pspi *priv)
switch (rsize) {
case 1:
val = ioread8(priv->base + NPCM_PSPI_DATA);
*priv->rx_buf++ = ioread8(priv->base + NPCM_PSPI_DATA);
break;
case 2:
val = ioread16(priv->base + NPCM_PSPI_DATA);
*priv->rx_buf++ = (val >> 8);
*priv->rx_buf++ = val & 0xff;
break;
default:
WARN_ON_ONCE(1);
return;
}
*priv->rx_buf = val;
priv->rx_buf += rsize;
}
static int npcm_pspi_transfer_one(struct spi_master *master,