[PATCH 2/5] spi: spi-zynqmp-gqspi: fix hang issue when suspend/resume
From: <hidden>
Date: 2021-04-16 00:48:58
Also in:
linux-spi, lkml
Subsystem:
spi subsystem, the rest · Maintainers:
Mark Brown, Linus Torvalds
From: Quanyang Wang <redacted>
After calling platform_set_drvdata(pdev, xqspi) in probe, the return
value of dev_get_drvdata(dev) is a pointer to struct zynqmp_qspi but
not struct spi_controller. A wrong structure type passing to the
functions spi_controller_suspend/resume will hang the system.
And we should check the return value of spi_controller_suspend, if
an error is returned, return it to PM subsystem to stop suspend.
Also, GQSPI_EN_MASK should be written to GQSPI_EN_OFST to enable
the spi controller in zynqmp_qspi_resume since it was disabled in
zynqmp_qspi_suspend before.
Fixes: 1c26372e5aa9 ("spi: spi-zynqmp-gqspi: Update driver to use spi-mem framework")
Signed-off-by: Quanyang Wang <redacted>
---
drivers/spi/spi-zynqmp-gqspi.c | 20 ++++++++++++++------
1 file changed, 14 insertions(+), 6 deletions(-)
diff --git a/drivers/spi/spi-zynqmp-gqspi.c b/drivers/spi/spi-zynqmp-gqspi.c
index f9056f0a480c..1146359528b9 100644
--- a/drivers/spi/spi-zynqmp-gqspi.c
+++ b/drivers/spi/spi-zynqmp-gqspi.c@@ -157,6 +157,7 @@ enum mode_type {GQSPI_MODE_IO, GQSPI_MODE_DMA}; * @data_completion: completion structure */ struct zynqmp_qspi { + struct spi_controller *ctlr; void __iomem *regs; struct clk *refclk; struct clk *pclk;
@@ -827,10 +828,13 @@ static void zynqmp_qspi_read_op(struct zynqmp_qspi *xqspi, u8 rx_nbits, */ static int __maybe_unused zynqmp_qspi_suspend(struct device *dev) { - struct spi_controller *ctlr = dev_get_drvdata(dev); - struct zynqmp_qspi *xqspi = spi_controller_get_devdata(ctlr); + struct zynqmp_qspi *xqspi = dev_get_drvdata(dev); + struct spi_controller *ctlr = xqspi->ctlr; + int ret; - spi_controller_suspend(ctlr); + ret = spi_controller_suspend(ctlr); + if (ret) + return ret; zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, 0x0);
@@ -848,7 +852,10 @@ static int __maybe_unused zynqmp_qspi_suspend(struct device *dev) */ static int __maybe_unused zynqmp_qspi_resume(struct device *dev) { - struct spi_controller *ctlr = dev_get_drvdata(dev); + struct zynqmp_qspi *xqspi = dev_get_drvdata(dev); + struct spi_controller *ctlr = xqspi->ctlr; + + zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, GQSPI_EN_MASK); spi_controller_resume(ctlr);
@@ -865,7 +872,7 @@ static int __maybe_unused zynqmp_qspi_resume(struct device *dev) */ static int __maybe_unused zynqmp_runtime_suspend(struct device *dev) { - struct zynqmp_qspi *xqspi = (struct zynqmp_qspi *)dev_get_drvdata(dev); + struct zynqmp_qspi *xqspi = dev_get_drvdata(dev); clk_disable_unprepare(xqspi->refclk); clk_disable_unprepare(xqspi->pclk);
@@ -883,7 +890,7 @@ static int __maybe_unused zynqmp_runtime_suspend(struct device *dev) */ static int __maybe_unused zynqmp_runtime_resume(struct device *dev) { - struct zynqmp_qspi *xqspi = (struct zynqmp_qspi *)dev_get_drvdata(dev); + struct zynqmp_qspi *xqspi = dev_get_drvdata(dev); int ret; ret = clk_prepare_enable(xqspi->pclk);
@@ -1090,6 +1097,7 @@ static int zynqmp_qspi_probe(struct platform_device *pdev) xqspi = spi_controller_get_devdata(ctlr); xqspi->dev = dev; + xqspi->ctlr = ctlr; platform_set_drvdata(pdev, xqspi); xqspi->regs = devm_platform_ioremap_resource(pdev, 0);
--
2.25.1
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