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UPSTREAM: spi: rockchip: handle zero length transfers without timing out

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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: Jon Lin <jon.lin@rock-chips.com>
(cherry picked from commit 5457773ef9)
Change-Id: I0c14eee10fbf0ffd2938d52b6d0c88910d8fd9d7
Signed-off-by: Tobias Schramm <t.schramm@manjaro.org>
This commit is contained in:
Tobias Schramm
2021-08-27 07:03:57 +02:00
committed by Jon Lin
parent 8d966971bf
commit 8bae8a0857
1 changed files with 6 additions and 0 deletions
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6
drivers/spi/spi-rockchip.c
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@@ -684,6 +684,12 @@ static int rockchip_spi_transfer_one(
struct rockchip_spi *rs = spi_controller_get_devdata(ctlr);
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));