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Commit 68ae7a93 authored by Jon Hunter's avatar Jon Hunter Committed by Vinod Koul
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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: default avatarJon Hunter <jonathanh@nvidia.com>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent 286a6441

drivers/dma/tegra20-apb-dma.c

+6 −0
Original line number Diff line number Diff line
@@ -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);