From: Dhruva Gole d-gole@ti.com
[ Upstream commit 2087e85bb66ee3652dafe732bb9b9b896229eafc ]
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@ti.com Link: https://lore.kernel.org/r/20230417091027.966146-3-d-gole@ti.com Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- 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 4472305479452..4b028d325663f 100644 --- a/drivers/spi/spi-cadence-quadspi.c +++ b/drivers/spi/spi-cadence-quadspi.c @@ -1767,17 +1767,30 @@ static int 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 const struct dev_pm_ops cqspi__dev_pm_ops = {