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Message-Id: <20241203013513.2628810-1-jon.lin@rock-chips.com> Date: Tue, 3 Dec 2024 09:35:13 +0800 From: Jon Lin <jon.lin@...k-chips.com> To: broonie@...nel.org Cc: linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org, heiko@...ech.de, jon.lin@...k-chips.com, linux-arm-kernel@...ts.infradead.org, linux-spi@...r.kernel.org Subject: [PATCH] spi: rockchip-sfc: Optimize the judgment mechanism completed by the controller 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@...k-chips.com> --- drivers/spi/spi-rockchip-sfc.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/spi/spi-rockchip-sfc.c b/drivers/spi/spi-rockchip-sfc.c index 138508d2c736..14f5b9346050 100644 --- a/drivers/spi/spi-rockchip-sfc.c +++ b/drivers/spi/spi-rockchip-sfc.c @@ -472,6 +472,16 @@ static int rockchip_sfc_xfer_done(struct rockchip_sfc *sfc, u32 timeout_us) int ret = 0; 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, !(status & SFC_SR_IS_BUSY), 20, timeout_us); -- 2.34.1
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