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path: root/drivers/dma/tegra20-apb-dma.c
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Diffstat (limited to 'drivers/dma/tegra20-apb-dma.c')
-rw-r--r--drivers/dma/tegra20-apb-dma.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c
index 18a561376c63..d4cabd6931e5 100644
--- a/drivers/dma/tegra20-apb-dma.c
+++ b/drivers/dma/tegra20-apb-dma.c
@@ -1545,6 +1545,10 @@ static int tegra_dma_pm_suspend(struct device *dev)
struct tegra_dma_channel *tdc = &tdma->channels[i];
struct tegra_dma_channel_regs *ch_reg = &tdc->channel_reg;
+ /* Only save the state of DMA channels that are in use */
+ if (!tdc->config_init)
+ continue;
+
ch_reg->csr = tdc_read(tdc, TEGRA_APBDMA_CHAN_CSR);
ch_reg->ahb_ptr = tdc_read(tdc, TEGRA_APBDMA_CHAN_AHBPTR);
ch_reg->apb_ptr = tdc_read(tdc, TEGRA_APBDMA_CHAN_APBPTR);
@@ -1579,6 +1583,10 @@ static int tegra_dma_pm_resume(struct device *dev)
struct tegra_dma_channel *tdc = &tdma->channels[i];
struct tegra_dma_channel_regs *ch_reg = &tdc->channel_reg;
+ /* Only restore the state of DMA channels that are in use */
+ if (!tdc->config_init)
+ continue;
+
if (tdma->chip_data->support_separate_wcount_reg)
tdc_write(tdc, TEGRA_APBDMA_CHAN_WCOUNT,
ch_reg->wcount);