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spi: rockchip-sfc: Optimize the judgment mechanism completed by the controller

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There is very little data left in fifo, and the controller will
complete the transmission in a short period of time, so
use readl_poll_timeout() for busy wait 10us to accelerate response.

Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
Link: https://patch.msgid.link/20241203013513.2628810-1-jon.lin@rock-chips.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Jon Lin 2024-12-03 09:35:13 +08:00 • committed by Mark Brown
parent ba257e7006
commit 577f1cf76c
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1 changed files with 10 additions and 0 deletions
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10
drivers/spi/spi-rockchip-sfc.c
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@ -472,6 +472,16 @@ static int rockchip_sfc_xfer_done(struct rockchip_sfc *sfc, u32 timeout_us)
int ret = 0; int ret = 0;
u32 status; u32 status;
/*
* There is very little data left in fifo, and the controller will
* complete the transmission in a short period of time.
*/
ret = readl_poll_timeout(sfc->regbase + SFC_SR, status,
!(status & SFC_SR_IS_BUSY),
0, 10);
if (!ret)
return 0;
ret = readl_poll_timeout(sfc->regbase + SFC_SR, status, ret = readl_poll_timeout(sfc->regbase + SFC_SR, status,
!(status & SFC_SR_IS_BUSY), !(status & SFC_SR_IS_BUSY),
20, timeout_us); 20, timeout_us);