From: Jon Hunter Date: Fri, 13 Nov 2015 16:39:40 +0000 (+0000) Subject: dmaengine: tegra-apb: Save and restore word count X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=68ae7a93fb0e6432baaa7c323a650b1b5461643f;p=linux-beck.git 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 Signed-off-by: Vinod Koul --- 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);