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bus: fsl-mc: pause the MC firmware when unloading

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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 <laurentiu.tudor@nxp.com>
Link: https://lore.kernel.org/r/20210715140718.8513-6-laurentiu.tudor@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Laurentiu Tudor 2021-07-15 17:07:16 +03:00 committed by Greg Kroah-Hartman
parent 8c97a4fc1b
commit 39243fc111
1 changed files with 10 additions and 0 deletions
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10
drivers/bus/fsl-mc/fsl-mc-bus.c
View file

@ -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;
}