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bus: fsl-mc: handle DMA config deferral in ACPI case

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ACPI DMA configure API may return a defer status code, so handle it.
On top of this, move the MC firmware resume after the DMA setup
is completed to avoid crashing due to DMA setup not being done yet or
being deferred.

Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Link: https://lore.kernel.org/r/20210715140718.8513-2-laurentiu.tudor@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Laurentiu Tudor 2021-07-15 17:07:12 +03:00 committed by Greg Kroah-Hartman
parent aa0a1ae020
commit f8cfa9bbab
1 changed files with 13 additions and 11 deletions
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24
drivers/bus/fsl-mc/fsl-mc-bus.c
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@ -1089,17 +1089,6 @@ static int fsl_mc_bus_probe(struct platform_device *pdev)
}
if (mc->fsl_mc_regs) {
/*
* Some bootloaders pause the MC firmware before booting the
* kernel so that MC will not cause faults as soon as the
* SMMU probes due to the fact that there's no configuration
* in place for MC.
* At this point MC should have all its SMMU setup done so make
* sure it is resumed.
*/
writel(readl(mc->fsl_mc_regs + FSL_MC_GCR1) & (~GCR1_P1_STOP),
mc->fsl_mc_regs + FSL_MC_GCR1);
if (IS_ENABLED(CONFIG_ACPI) && !dev_of_node(&pdev->dev)) {
mc_stream_id = readl(mc->fsl_mc_regs + FSL_MC_FAPR);
/*
@ -1113,11 +1102,24 @@ static int fsl_mc_bus_probe(struct platform_device *pdev)
error = acpi_dma_configure_id(&pdev->dev,
DEV_DMA_COHERENT,
&mc_stream_id);
if (error == -EPROBE_DEFER)
return error;
if (error)
dev_warn(&pdev->dev,
"failed to configure dma: %d.\n",
error);
}
/*
* Some bootloaders pause the MC firmware before booting the
* kernel so that MC will not cause faults as soon as the
* SMMU probes due to the fact that there's no configuration
* in place for MC.
* At this point MC should have all its SMMU setup done so make
* sure it is resumed.
*/
writel(readl(mc->fsl_mc_regs + FSL_MC_GCR1) & (~GCR1_P1_STOP),
mc->fsl_mc_regs + FSL_MC_GCR1);
}
/*