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dmaengine: tegra-apb: Save and restore word count

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Newer tegra devices have a separate word count register per channel that
contains the number of words to be transferred. This register is not
saved or restored by the suspend/resume helpers for these newer devices
and so ensure that it is.

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Jon Hunter 2015-11-13 16:39:40 +00:00 committed by Vinod Koul
parent 286a6441a3
commit 68ae7a93fb
1 changed files with 6 additions and 0 deletions
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6
drivers/dma/tegra20-apb-dma.c
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@ -1550,6 +1550,9 @@ static int tegra_dma_pm_suspend(struct device *dev)
ch_reg->apb_ptr = tdc_read(tdc, TEGRA_APBDMA_CHAN_APBPTR);
ch_reg->ahb_seq = tdc_read(tdc, TEGRA_APBDMA_CHAN_AHBSEQ);
ch_reg->apb_seq = tdc_read(tdc, TEGRA_APBDMA_CHAN_APBSEQ);
if (tdma->chip_data->support_separate_wcount_reg)
ch_reg->wcount = tdc_read(tdc,
TEGRA_APBDMA_CHAN_WCOUNT);
}
/* Disable clock */
@ -1576,6 +1579,9 @@ 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;
if (tdma->chip_data->support_separate_wcount_reg)
tdc_write(tdc, TEGRA_APBDMA_CHAN_WCOUNT,
ch_reg->wcount);
tdc_write(tdc, TEGRA_APBDMA_CHAN_APBSEQ, ch_reg->apb_seq);
tdc_write(tdc, TEGRA_APBDMA_CHAN_APBPTR, ch_reg->apb_ptr);
tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBSEQ, ch_reg->ahb_seq);