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From b07f349d1864abe29436f45e3047da2bdd476462 Mon Sep 17 00:00:00 2001
From: Khairul Anuar Romli <khairul.anuar.romli@altera.com>
Date: Mon, 16 Jun 2025 09:13:53 +0800
Subject: spi: spi-cadence-quadspi: Fix pm runtime unbalance
From: Khairul Anuar Romli <khairul.anuar.romli@altera.com>
commit b07f349d1864abe29436f45e3047da2bdd476462 upstream.
Having PM put sync in remove function is causing PM underflow during
remove operation. This is caused by the function, runtime_pm_get_sync,
not being called anywhere during the op. Ensure that calls to
pm_runtime_enable()/pm_runtime_disable() and
pm_runtime_get_sync()/pm_runtime_put_sync() match.
echo 108d2000.spi > /sys/bus/platform/drivers/cadence-qspi/unbind
[ 49.644256] Deleting MTD partitions on "108d2000.spi.0":
[ 49.649575] Deleting u-boot MTD partition
[ 49.684087] Deleting root MTD partition
[ 49.724188] cadence-qspi 108d2000.spi: Runtime PM usage count underflow!
Continuous bind/unbind will result in an "Unbalanced pm_runtime_enable" error.
Subsequent unbind attempts will return a "No such device" error, while bind
attempts will return a "Resource temporarily unavailable" error.
[ 47.592434] cadence-qspi 108d2000.spi: Runtime PM usage count underflow!
[ 49.592233] cadence-qspi 108d2000.spi: detected FIFO depth (1024) different from config (128)
[ 53.232309] cadence-qspi 108d2000.spi: Runtime PM usage count underflow!
[ 55.828550] cadence-qspi 108d2000.spi: detected FIFO depth (1024) different from config (128)
[ 57.940627] cadence-qspi 108d2000.spi: Runtime PM usage count underflow!
[ 59.912490] cadence-qspi 108d2000.spi: detected FIFO depth (1024) different from config (128)
[ 61.876243] cadence-qspi 108d2000.spi: Runtime PM usage count underflow!
[ 61.883000] platform 108d2000.spi: Unbalanced pm_runtime_enable!
[ 532.012270] cadence-qspi 108d2000.spi: probe with driver cadence-qspi failed1
Also, change clk_disable_unprepare() to clk_disable() since continuous
bind and unbind operations will trigger a warning indicating that the clock is
already unprepared.
Fixes: 4892b374c9b7 ("mtd: spi-nor: cadence-quadspi: Add runtime PM support")
cc: stable@vger.kernel.org # 6.6+
Signed-off-by: Khairul Anuar Romli <khairul.anuar.romli@altera.com>
Reviewed-by: Matthew Gerlach <matthew.gerlach@altera.com>
Link: https://patch.msgid.link/4e7a4b8aba300e629b45a04f90bddf665fbdb335.1749601877.git.khairul.anuar.romli@altera.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/spi/spi-cadence-quadspi.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
--- a/drivers/spi/spi-cadence-quadspi.c
+++ b/drivers/spi/spi-cadence-quadspi.c
@@ -1929,10 +1929,10 @@ static int cqspi_probe(struct platform_d
goto probe_setup_failed;
}
- ret = devm_pm_runtime_enable(dev);
- if (ret) {
- if (cqspi->rx_chan)
- dma_release_channel(cqspi->rx_chan);
+ pm_runtime_enable(dev);
+
+ if (cqspi->rx_chan) {
+ dma_release_channel(cqspi->rx_chan);
goto probe_setup_failed;
}
@@ -1952,6 +1952,7 @@ static int cqspi_probe(struct platform_d
return 0;
probe_setup_failed:
cqspi_controller_enable(cqspi, 0);
+ pm_runtime_disable(dev);
probe_reset_failed:
if (cqspi->is_jh7110)
cqspi_jh7110_disable_clk(pdev, cqspi);
@@ -1970,7 +1971,8 @@ static void cqspi_remove(struct platform
if (cqspi->rx_chan)
dma_release_channel(cqspi->rx_chan);
- clk_disable_unprepare(cqspi->clk);
+ if (pm_runtime_get_sync(&pdev->dev) >= 0)
+ clk_disable(cqspi->clk);
if (cqspi->is_jh7110)
cqspi_jh7110_disable_clk(pdev, cqspi);
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