[PATCH 2/2] spi: cadence-quadspi: fix suspend-resume implementations
Dhruva Gole
d-gole at ti.com
Mon Apr 17 02:10:27 PDT 2023
The cadence QSPI driver misbehaves after performing a full system suspend
resume:
...
spi-nor spi0.0: resume() failed
...
This results in a flash connected via OSPI interface after system suspend-
resume to be unusable.
fix these suspend and resume functions.
Fixes: 140623410536 ("mtd: spi-nor: Add driver for Cadence Quad SPI Flash Controller")
Signed-off-by: Dhruva Gole <d-gole at ti.com>
---
drivers/spi/spi-cadence-quadspi.c | 19 ++++++++++++++++---
1 file changed, 16 insertions(+), 3 deletions(-)
diff --git a/drivers/spi/spi-cadence-quadspi.c b/drivers/spi/spi-cadence-quadspi.c
index d47e954fe809..91908e8cf92e 100644
--- a/drivers/spi/spi-cadence-quadspi.c
+++ b/drivers/spi/spi-cadence-quadspi.c
@@ -1816,17 +1816,30 @@ static void cqspi_remove(struct platform_device *pdev)
static int cqspi_suspend(struct device *dev)
{
struct cqspi_st *cqspi = dev_get_drvdata(dev);
+ struct spi_master *master = dev_get_drvdata(dev);
+ int ret;
+ ret = spi_master_suspend(master);
cqspi_controller_enable(cqspi, 0);
- return 0;
+
+ clk_disable_unprepare(cqspi->clk);
+
+ return ret;
}
static int cqspi_resume(struct device *dev)
{
struct cqspi_st *cqspi = dev_get_drvdata(dev);
+ struct spi_master *master = dev_get_drvdata(dev);
- cqspi_controller_enable(cqspi, 1);
- return 0;
+ clk_prepare_enable(cqspi->clk);
+ cqspi_wait_idle(cqspi);
+ cqspi_controller_init(cqspi);
+
+ cqspi->current_cs = -1;
+ cqspi->sclk = 0;
+
+ return spi_master_resume(master);
}
static SIMPLE_DEV_PM_OPS(cqspi__dev_pm_ops, cqspi_suspend, cqspi_resume);
--
2.25.1
More information about the linux-arm-kernel
mailing list