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dmaengine: tegra-apb: proper default init of channel slave_id 

Initialize default channel slave_id(req_sel) to invalid id
(i.e max supported slave id + 1) to avoid overwriting of slave_id
during tegra_dma_slave_config() with client data if slave_id
is not initialized through DT

Signed-off-by: Shardar Shariff Md <smohammed@nvidia.com>
Reviewed-by: Jon Hunter <jonathanh@nvidia.com>
Tested-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
pull/7/head
Shardar Shariff Md 2016-04-23 15:06:00 +05:30 committed by Vinod Koul
parent f55532a0c0
commit 00ef4490eb
1 changed files with 14 additions and 2 deletions
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16
drivers/dma/tegra20-apb-dma.c
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@ -54,6 +54,7 @@
#define TEGRA_APBDMA_CSR_ONCE BIT(27)
#define TEGRA_APBDMA_CSR_FLOW BIT(21)
#define TEGRA_APBDMA_CSR_REQ_SEL_SHIFT 16
#define TEGRA_APBDMA_CSR_REQ_SEL_MASK 0x1F
#define TEGRA_APBDMA_CSR_WCOUNT_MASK 0xFFFC
/* STATUS register */
@ -114,6 +115,8 @@
/* Channel base address offset from APBDMA base address */
#define TEGRA_APBDMA_CHANNEL_BASE_ADD_OFFSET 0x1000
#define TEGRA_APBDMA_SLAVE_ID_INVALID (TEGRA_APBDMA_CSR_REQ_SEL_MASK + 1)
struct tegra_dma;
/*
@ -353,8 +356,11 @@ static int tegra_dma_slave_config(struct dma_chan *dc,
}
memcpy(&tdc->dma_sconfig, sconfig, sizeof(*sconfig));
if (!tdc->slave_id)
if (tdc->slave_id == TEGRA_APBDMA_SLAVE_ID_INVALID) {
if (sconfig->slave_id > TEGRA_APBDMA_CSR_REQ_SEL_MASK)
return -EINVAL;
tdc->slave_id = sconfig->slave_id;
}
tdc->config_init = true;
return 0;
}
@ -1236,7 +1242,7 @@ static void tegra_dma_free_chan_resources(struct dma_chan *dc)
}
pm_runtime_put(tdma->dev);
tdc->slave_id = 0;
tdc->slave_id = TEGRA_APBDMA_SLAVE_ID_INVALID;
}
static struct dma_chan *tegra_dma_of_xlate(struct of_phandle_args *dma_spec,
@ -1246,6 +1252,11 @@ static struct dma_chan *tegra_dma_of_xlate(struct of_phandle_args *dma_spec,
struct dma_chan *chan;
struct tegra_dma_channel *tdc;
if (dma_spec->args[0] > TEGRA_APBDMA_CSR_REQ_SEL_MASK) {
dev_err(tdma->dev, "Invalid slave id: %d\n", dma_spec->args[0]);
return NULL;
}
chan = dma_get_any_slave_channel(&tdma->dma_dev);
if (!chan)
return NULL;
@ -1389,6 +1400,7 @@ static int tegra_dma_probe(struct platform_device *pdev)
&tdma->dma_dev.channels);
tdc->tdma = tdma;
tdc->id = i;
tdc->slave_id = TEGRA_APBDMA_SLAVE_ID_INVALID;
tasklet_init(&tdc->tasklet, tegra_dma_tasklet,
(unsigned long)tdc);