From 6f2b6422d4787ffa72bd81abdc1b503dbf87a49a Mon Sep 17 00:00:00 2001 From: Alan Tull Date: Fri, 5 Jun 2015 08:49:15 -0500 Subject: [PATCH] EDAC, altera: Do not allow suspend when EDAC is enabled Suspend-to-RAM and EDAC support are mutually exclusive on SOCFPGA. If EDAC is enabled, it will prevent the platform from going into suspend. The reason is that the IRQ vectors for OCRAM reside on DDR and in Suspend-to-RAM mode we're executing out of OCRAM. If an ECC error occurs, we can't handle it so it was decided to make them mutually exclusive. Signed-off-by: Alan Tull Signed-off-by: Dinh Nguyen Cc: dinh.linux@gmail.com Cc: dougthompson@xmission.com Cc: linux-edac Cc: mchehab@osg.samsung.com Cc: tthayer@opensource.altera.com Link: http://lkml.kernel.org/r/1433512155-9906-1-git-send-email-dinguyen@opensource.altera.com Signed-off-by: Borislav Petkov --- drivers/edac/altera_edac.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/edac/altera_edac.c b/drivers/edac/altera_edac.c index 182c741adf3e..23ef0917483c 100644 --- a/drivers/edac/altera_edac.c +++ b/drivers/edac/altera_edac.c @@ -477,11 +477,31 @@ static int altr_sdram_remove(struct platform_device *pdev) return 0; } +/* + * If you want to suspend, need to disable EDAC by removing it + * from the device tree or defconfig. + */ +#ifdef CONFIG_PM +static int altr_sdram_prepare(struct device *dev) +{ + pr_err("Suspend not allowed when EDAC is enabled.\n"); + + return -EPERM; +} + +static const struct dev_pm_ops altr_sdram_pm_ops = { + .prepare = altr_sdram_prepare, +}; +#endif + static struct platform_driver altr_sdram_edac_driver = { .probe = altr_sdram_probe, .remove = altr_sdram_remove, .driver = { .name = "altr_sdram_edac", +#ifdef CONFIG_PM + .pm = &altr_sdram_pm_ops, +#endif .of_match_table = altr_sdram_ctrl_of_match, }, };