Commit c4c21f22 authored by Thierry Reding's avatar Thierry Reding
Browse files

memory: tegra: Set DMA mask based on supported address bits 



The memory controller on Tegra124 and later supports 34 or more address
bits. Advertise that by setting the DMA mask based on the number of the
address bits.

Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
parent 3feb4a3c

drivers/memory/tegra/mc.c

+10 −0
Original line number Diff line number Diff line
@@ -5,6 +5,7 @@ 


#include <linux/clk.h>

#include <linux/delay.h>

#include <linux/dma-mapping.h>

#include <linux/interrupt.h>

#include <linux/kernel.h>

#include <linux/module.h>
@@ -626,6 +627,7 @@ static int tegra_mc_probe(struct platform_device *pdev) 
	struct resource *res;

	struct tegra_mc *mc;

	void *isr;

	u64 mask;

	int err;



	mc = devm_kzalloc(&pdev->dev, sizeof(*mc), GFP_KERNEL);
@@ -637,6 +639,14 @@ static int tegra_mc_probe(struct platform_device *pdev) 
	mc->soc = of_device_get_match_data(&pdev->dev);

	mc->dev = &pdev->dev;



	mask = DMA_BIT_MASK(mc->soc->num_address_bits);



	err = dma_coerce_mask_and_coherent(&pdev->dev, mask);

	if (err < 0) {

		dev_err(&pdev->dev, "failed to set DMA mask: %d\n", err);

		return err;

	}



	/* length of MC tick in nanoseconds */

	mc->tick = 30;

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