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soc/tegra: fuse: Fix reading registers using DMA on Tegra20

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FUSE driver doesn't configure DMA channel properly, because of it DMA
transfer is never issued and tegra20_fuse_read() always return 0x0.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Dmitry Osipenko 2017-10-20 01:08:03 +03:00 committed by Thierry Reding
parent c641ec6eab
commit 55a042b3f6
2 changed files with 4 additions and 1 deletions
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1
drivers/soc/tegra/fuse/fuse-tegra.c
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@ -135,6 +135,7 @@ static int tegra_fuse_probe(struct platform_device *pdev)
/* take over the memory region from the early initialization */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
fuse->phys = res->start;
fuse->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(fuse->base))
return PTR_ERR(fuse->base);

4
drivers/soc/tegra/fuse/fuse-tegra20.c
View File

@ -59,7 +59,7 @@ static u32 tegra20_fuse_read(struct tegra_fuse *fuse, unsigned int offset)
mutex_lock(&fuse->apbdma.lock);
fuse->apbdma.config.src_addr = fuse->apbdma.phys + FUSE_BEGIN + offset;
fuse->apbdma.config.src_addr = fuse->phys + FUSE_BEGIN + offset;
err = dmaengine_slave_config(fuse->apbdma.chan, &fuse->apbdma.config);
if (err)
@ -119,6 +119,8 @@ static int tegra20_fuse_probe(struct tegra_fuse *fuse)
fuse->apbdma.config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
fuse->apbdma.config.src_maxburst = 1;
fuse->apbdma.config.dst_maxburst = 1;
fuse->apbdma.config.direction = DMA_DEV_TO_MEM;
fuse->apbdma.config.device_fc = false;
init_completion(&fuse->apbdma.wait);
mutex_init(&fuse->apbdma.lock);