From: Laurentiu Tudor Date: Thu, 15 Jul 2021 14:07:16 +0000 (+0300) Subject: bus: fsl-mc: pause the MC firmware when unloading X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=39243fc1110caf1e76ea647059e061a021680dfd;p=linux.git bus: fsl-mc: pause the MC firmware when unloading Pause the MC firmware when unloading the driver so that it doesn't crash in certain scenarios, such as kexec. Signed-off-by: Laurentiu Tudor Link: https://lore.kernel.org/r/20210715140718.8513-6-laurentiu.tudor@nxp.com Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c index 41861ca5c8f1e..e5b4830cf3c5e 100644 --- a/drivers/bus/fsl-mc/fsl-mc-bus.c +++ b/drivers/bus/fsl-mc/fsl-mc-bus.c @@ -1207,6 +1207,16 @@ static int fsl_mc_bus_remove(struct platform_device *pdev) bus_unregister_notifier(&fsl_mc_bus_type, &fsl_mc_nb); + if (mc->fsl_mc_regs) { + /* + * Pause the MC firmware so that it doesn't crash in certain + * scenarios, such as kexec. + */ + writel(readl(mc->fsl_mc_regs + FSL_MC_GCR1) | + (GCR1_P1_STOP | GCR1_P2_STOP), + mc->fsl_mc_regs + FSL_MC_GCR1); + } + return 0; }