diff options
| author | Jon Hunter <jonathanh@nvidia.com> | 2015-11-13 16:39:40 +0000 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2015-12-05 16:13:08 +0530 |
| commit | 68ae7a93fb0e6432baaa7c323a650b1b5461643f (patch) | |
| tree | 3e5f8378cc6b9a69d554bd51d97e3ab30313d527 /drivers/dma/tegra20-apb-dma.c | |
| parent | 286a6441a333abfa21a700683db5b3302f75a4de (diff) | |
| download | lwn-68ae7a93fb0e6432baaa7c323a650b1b5461643f.tar.gz lwn-68ae7a93fb0e6432baaa7c323a650b1b5461643f.zip | |
dmaengine: tegra-apb: Save and restore word count
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>
Diffstat (limited to 'drivers/dma/tegra20-apb-dma.c')
| -rw-r--r-- | drivers/dma/tegra20-apb-dma.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c index 355dbc354818..18a561376c63 100644 --- a/drivers/dma/tegra20-apb-dma.c +++ b/drivers/dma/tegra20-apb-dma.c @@ -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); |