Messages in this thread Patch in this message | | | From | Geert Uytterhoeven <> | Subject | [PATCH 7/7] memory: renesas-rpc-if: Reinitialize registers during system resume | Date | Mon, 27 Jun 2022 17:31:14 +0200 |
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During PSCI system suspend, R-Car Gen3 SoCs may be powered down, and thus the RPC-IF register state may be lost. Consequently, when using the RPC-IF after system resume, data corruption may happen.
Fix this by reinitializing the hardware state during system resume. As this requires resuming the RPC-IF core device, this can only be done when the device is under active control of the HyperBus or SPI child driver.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> --- drivers/memory/renesas-rpc-if.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+)
diff --git a/drivers/memory/renesas-rpc-if.c b/drivers/memory/renesas-rpc-if.c index ec76e603ad24d214..2a49d4511c8296c5 100644 --- a/drivers/memory/renesas-rpc-if.c +++ b/drivers/memory/renesas-rpc-if.c @@ -757,6 +757,20 @@ static int rpcif_remove(struct platform_device *pdev) return 0; } +static int rpcif_resume(struct device *dev) +{ + struct rpcif_priv *rpc = dev_get_drvdata(dev); + + if (!pm_runtime_enabled(dev)) { + /* Not yet activated or deactivated by child device */ + return 0; + } + + return rpcif_hw_init(dev, rpc->bus_size == 2); +} + +static DEFINE_SIMPLE_DEV_PM_OPS(rpcif_pm_ops, NULL, rpcif_resume); + static const struct of_device_id rpcif_of_match[] = { { .compatible = "renesas,rcar-gen3-rpc-if", .data = (void *)RPCIF_RCAR_GEN3 }, { .compatible = "renesas,rzg2l-rpc-if", .data = (void *)RPCIF_RZ_G2L }, @@ -770,6 +784,7 @@ static struct platform_driver rpcif_driver = { .driver = { .name = "rpc-if", .of_match_table = rpcif_of_match, + .pm = pm_sleep_ptr(&rpcif_pm_ops), }, }; module_platform_driver(rpcif_driver); -- 2.25.1
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