| Message ID | 20210827050357.165409-1-t.schramm@manjaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | spi: rockchip: handle zero length transfers without timing out | expand |
On Fri, 27 Aug 2021 07:03:57 +0200, Tobias Schramm wrote: > 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. > > [...] Applied to https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next Thanks! [1/1] spi: rockchip: handle zero length transfers without timing out commit: 5457773ef99f25fcc4b238ac76b68e28273250f4 All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted. You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed. If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced. Please add any relevant lists and maintainers to the CCs when replying to this mail. Thanks, Mark
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));
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> --- drivers/spi/spi-rockchip.c | 6 ++++++ 1 file changed, 6 insertions(+)