Commit 74abd1f2 authored by Laurentiu Tudor's avatar Laurentiu Tudor Committed by Greg Kroah-Hartman
Browse files

bus: fsl-mc: make sure MC firmware is up and running 



Some bootloaders might pause the MC firmware before starting the
kernel to ensure that MC will not cause faults as soon as SMMU
probes due to no configuration being in place for the firmware.
Make sure that MC is resumed at probe time as its SMMU setup should
be done by now.
Also included, a comment fix on how PL and BMT bits are packed in
the StreamID.

Signed-off-by: default avatarLaurentiu Tudor <laurentiu.tudor@nxp.com>
Link: https://lore.kernel.org/r/20201105153050.19662-2-laurentiu.tudor@nxp.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 61243c03

drivers/bus/fsl-mc/fsl-mc-bus.c

+30 −12
Original line number Diff line number Diff line
@@ -60,6 +60,9 @@ struct fsl_mc_addr_translation_range { 
	phys_addr_t start_phys_addr;

};



#define FSL_MC_GCR1	0x0

#define GCR1_P1_STOP	BIT(31)



#define FSL_MC_FAPR	0x28

#define MC_FAPR_PL	BIT(18)

#define MC_FAPR_BMT	BIT(17)
@@ -973,22 +976,37 @@ static int fsl_mc_bus_probe(struct platform_device *pdev) 
			return PTR_ERR(mc->fsl_mc_regs);

	}



	if (mc->fsl_mc_regs && IS_ENABLED(CONFIG_ACPI) &&

	    !dev_of_node(&pdev->dev)) {

	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);

			/*

		 * HW ORs the PL and BMT bit, places the result in bit 15 of

		 * the StreamID and ORs in the ICID. Calculate it accordingly.

			 * HW ORs the PL and BMT bit, places the result in bit

			 * 14 of the StreamID and ORs in the ICID. Calculate it

			 * accordingly.

			 */

			mc_stream_id = (mc_stream_id & 0xffff) |

				((mc_stream_id & (MC_FAPR_PL | MC_FAPR_BMT)) ?

					0x4000 : 0);

		error = acpi_dma_configure_id(&pdev->dev, DEV_DMA_COHERENT,

					BIT(14) : 0);

			error = acpi_dma_configure_id(&pdev->dev,

						      DEV_DMA_COHERENT,

						      &mc_stream_id);

			if (error)

			dev_warn(&pdev->dev, "failed to configure dma: %d.\n",

				dev_warn(&pdev->dev,

					 "failed to configure dma: %d.\n",

					 error);

		}

	}



	/*

	 * Get physical address of MC portal for the root DPRC:

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