diff options
| author | Tobias Schramm <t.schramm@manjaro.org> | 2021-08-27 07:03:57 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2021-09-03 13:31:49 +0100 |
| commit | 5457773ef99f25fcc4b238ac76b68e28273250f4 (patch) | |
| tree | 903ee2f7beaf6ba441daef5d9f9664d1f6ee53b1 | |
| parent | 26cfc0dbe43aae60dc03af27077775244f26c167 (diff) | |
| download | linux-5457773ef99f25fcc4b238ac76b68e28273250f4.tar.bz2 | |
spi: rockchip: handle zero length transfers without timing out
Previously zero length transfers submitted to the Rokchip SPI driver would
time out in the SPI layer. This happens because the SPI peripheral does
not trigger a transfer completion interrupt for zero length transfers.
Fix that by completing zero length transfers immediately at start of
transfer.
Signed-off-by: Tobias Schramm <t.schramm@manjaro.org>
Link: https://lore.kernel.org/r/20210827050357.165409-1-t.schramm@manjaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>
| -rw-r--r-- | drivers/spi/spi-rockchip.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c index 540861ca2ba3..553b6b9d0222 100644 --- a/drivers/spi/spi-rockchip.c +++ b/drivers/spi/spi-rockchip.c @@ -600,6 +600,12 @@ static int rockchip_spi_transfer_one( int ret; bool use_dma; + /* Zero length transfers won't trigger an interrupt on completion */ + if (!xfer->len) { + spi_finalize_current_transfer(ctlr); + return 1; + } + WARN_ON(readl_relaxed(rs->regs + ROCKCHIP_SPI_SSIENR) && (readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY)); |