diff options
| author | Miquel Raynal <miquel.raynal@bootlin.com> | 2022-01-27 12:18:04 +0300 |
|---|---|---|
| committer | Miquel Raynal <miquel.raynal@bootlin.com> | 2022-02-10 11:32:30 +0300 |
| commit | 5fd6739e0df7e320bcac103dfb95fe75941fea17 (patch) | |
| tree | 997cc9c84210837c4adf2020608c804a28b27720 /drivers/spi/spi-mxic.c | |
| parent | f9d7c7265bcff7d9a17425a8cddf702e8fe159c2 (diff) | |
| download | linux-5fd6739e0df7e320bcac103dfb95fe75941fea17.tar.xz | |
spi: mxic: Fix the transmit path
By working with external hardware ECC engines, we figured out that
Under certain circumstances, it is needed for the SPI controller to
check INT_TX_EMPTY and INT_RX_NOT_EMPTY in both receive and transmit
path (not only in the receive path). The delay penalty being
negligible, move this code in the common path.
Fixes: b942d80b0a39 ("spi: Add MXIC controller driver")
Cc: stable@vger.kernel.org
Suggested-by: Mason Yang <masonccyang@mxic.com.tw>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Zhengxun Li <zhengxunli@mxic.com.tw>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/linux-mtd/20220127091808.1043392-10-miquel.raynal@bootlin.com
Diffstat (limited to 'drivers/spi/spi-mxic.c')
| -rw-r--r-- | drivers/spi/spi-mxic.c | 28 |
1 files changed, 12 insertions, 16 deletions
diff --git a/drivers/spi/spi-mxic.c b/drivers/spi/spi-mxic.c index 6bec0a7c77d3..22a82f5f74b5 100644 --- a/drivers/spi/spi-mxic.c +++ b/drivers/spi/spi-mxic.c @@ -304,25 +304,21 @@ static int mxic_spi_data_xfer(struct mxic_spi *mxic, const void *txbuf, writel(data, mxic->regs + TXD(nbytes % 4)); + ret = readl_poll_timeout(mxic->regs + INT_STS, sts, + sts & INT_TX_EMPTY, 0, USEC_PER_SEC); + if (ret) + return ret; + + ret = readl_poll_timeout(mxic->regs + INT_STS, sts, + sts & INT_RX_NOT_EMPTY, 0, + USEC_PER_SEC); + if (ret) + return ret; + + data = readl(mxic->regs + RXD); if (rxbuf) { - ret = readl_poll_timeout(mxic->regs + INT_STS, sts, - sts & INT_TX_EMPTY, 0, - USEC_PER_SEC); - if (ret) - return ret; - - ret = readl_poll_timeout(mxic->regs + INT_STS, sts, - sts & INT_RX_NOT_EMPTY, 0, - USEC_PER_SEC); - if (ret) - return ret; - - data = readl(mxic->regs + RXD); data >>= (8 * (4 - nbytes)); memcpy(rxbuf + pos, &data, nbytes); - WARN_ON(readl(mxic->regs + INT_STS) & INT_RX_NOT_EMPTY); - } else { - readl(mxic->regs + RXD); } WARN_ON(readl(mxic->regs + INT_STS) & INT_RX_NOT_EMPTY); |