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Code Issues Releases Wiki Activity

spi: spi-cadence-quadspi: Fix pm runtime unbalance

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commit b07f349d18 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: 4892b374c9 ("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>
This commit is contained in:
Khairul Anuar Romli 2025-06-16 09:13:53 +08:00 committed by Greg Kroah-Hartman
parent c46358d027
commit cdfb20e4b3
1 changed files with 10 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/spi/spi-cadence-quadspi.c
View File

@ -1868,6 +1868,13 @@ static int cqspi_probe(struct platform_device *pdev)
goto probe_setup_failed;
}
pm_runtime_enable(dev);
if (cqspi->rx_chan) {
dma_release_channel(cqspi->rx_chan);
goto probe_setup_failed;
}
ret = spi_register_controller(host);
if (ret) {
dev_err(&pdev->dev, "failed to register SPI ctlr %d\n", ret);
@ -1877,6 +1884,7 @@ static int cqspi_probe(struct platform_device *pdev)
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);
@ -1898,7 +1906,8 @@ static void cqspi_remove(struct platform_device *pdev)
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);