From: Miquel Raynal <miquel.raynal@xxxxxxxxxxx> commit 5fd6739e0df7e320bcac103dfb95fe75941fea17 upstream. 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@xxxxxxxxxxxxxxx Suggested-by: Mason Yang <masonccyang@xxxxxxxxxxx> Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx> Reviewed-by: Zhengxun Li <zhengxunli@xxxxxxxxxxx> Reviewed-by: Mark Brown <broonie@xxxxxxxxxx> Link: https://lore.kernel.org/linux-mtd/20220127091808.1043392-10-miquel.raynal@xxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/spi/spi-mxic.c | 26 +++++++++++--------------- 1 file changed, 11 insertions(+), 15 deletions(-) --- a/drivers/spi/spi-mxic.c +++ b/drivers/spi/spi-mxic.c @@ -304,25 +304,21 @@ static int mxic_spi_data_xfer(struct mxi writel(data, mxic->regs + TXD(nbytes % 4)); - 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_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; + 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 = readl(mxic->regs + RXD); + if (rxbuf) { 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); Patches currently in stable-queue which might be from miquel.raynal@xxxxxxxxxxx are queue-5.4/spi-mxic-fix-the-transmit-path.patch