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Groups > linux.kernel > #1248462
| From | Jon Hunter <jonathanh@nvidia.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 3/6] dmaengine: tegra-apb: Save and restore word count |
| Date | 2015-10-16 10:30 +0200 |
| Message-ID | <qk8yL-FP-11@gated-at.bofh.it> (permalink) |
| References | <qk8yK-FP-7@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
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> --- drivers/dma/tegra20-apb-dma.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c index cf546671f83d..06063d370272 100644 --- a/drivers/dma/tegra20-apb-dma.c +++ b/drivers/dma/tegra20-apb-dma.c @@ -1544,6 +1544,9 @@ 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 */ @@ -1569,6 +1572,9 @@ 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); -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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[PATCH 3/6] dmaengine: tegra-apb: Save and restore word count Jon Hunter <jonathanh@nvidia.com> - 2015-10-16 10:30 +0200
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