From f8cfa9bbab338b64229bffb93fdbb755be9d58d5 Mon Sep 17 00:00:00 2001 From: Laurentiu Tudor Date: Thu, 15 Jul 2021 17:07:12 +0300 Subject: [PATCH] bus: fsl-mc: handle DMA config deferral in ACPI case 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 Link: https://lore.kernel.org/r/20210715140718.8513-2-laurentiu.tudor@nxp.com Signed-off-by: Greg Kroah-Hartman --- drivers/bus/fsl-mc/fsl-mc-bus.c | 24 +++++++++++++----------- 1 file changed, 13 insertions(+), 11 deletions(-) diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c index ffec8384..ffd7a1f 100644 --- a/drivers/bus/fsl-mc/fsl-mc-bus.c +++ b/drivers/bus/fsl-mc/fsl-mc-bus.c @@ -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); } /* -- 2.7.4