linux-kernel - [PATCH 3/6] dmaengine: tegra-apb: Save and restore word count

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Date:	Fri, 16 Oct 2015 09:25:54 +0100
From:	Jon Hunter <jonathanh@...dia.com>
To:	Laxman Dewangan <ldewangan@...dia.com>,
	Vinod Koul <vinod.koul@...el.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Alexandre Courbot <gnurou@...il.com>
CC:	<dmaengine@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Jon Hunter <jonathanh@...dia.com>
Subject: [PATCH 3/6] 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@...dia.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

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