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authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2019-01-07 14:07:39 +0300
committerVinod Koul <vkoul@kernel.org>2019-01-07 15:27:13 +0300
commit91f0ff883e9ae654503fc62c588eefc8558e457f (patch)
tree69eb9940144d3d6fd2e6066e81c636237e3171f1 /drivers/dma/dw
parent69da8be90d5e85e60b5377c47384154b9dabf592 (diff)
downloadlinux-91f0ff883e9ae654503fc62c588eefc8558e457f.tar.xz
dmaengine: dw: Reset DRAIN bit when resume the channel
For Intel iDMA 32-bit the channel can be drained on a suspend. We need to reset the bit on the resume to return a status quo. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma/dw')
-rw-r--r--drivers/dma/dw/core.c10
-rw-r--r--drivers/dma/dw/dw.c8
-rw-r--r--drivers/dma/dw/idma32.c13
-rw-r--r--drivers/dma/dw/regs.h1
4 files changed, 25 insertions, 7 deletions
diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c
index 8a581d86ea8d..6a23203e601d 100644
--- a/drivers/dma/dw/core.c
+++ b/drivers/dma/dw/core.c
@@ -846,11 +846,11 @@ static int dwc_pause(struct dma_chan *chan)
return 0;
}
-static inline void dwc_chan_resume(struct dw_dma_chan *dwc)
+static inline void dwc_chan_resume(struct dw_dma_chan *dwc, bool drain)
{
- u32 cfglo = channel_readl(dwc, CFG_LO);
+ struct dw_dma *dw = to_dw_dma(dwc->chan.device);
- channel_writel(dwc, CFG_LO, cfglo & ~DWC_CFGL_CH_SUSP);
+ dw->resume_chan(dwc, drain);
clear_bit(DW_DMA_IS_PAUSED, &dwc->flags);
}
@@ -863,7 +863,7 @@ static int dwc_resume(struct dma_chan *chan)
spin_lock_irqsave(&dwc->lock, flags);
if (test_bit(DW_DMA_IS_PAUSED, &dwc->flags))
- dwc_chan_resume(dwc);
+ dwc_chan_resume(dwc, false);
spin_unlock_irqrestore(&dwc->lock, flags);
@@ -886,7 +886,7 @@ static int dwc_terminate_all(struct dma_chan *chan)
dwc_chan_disable(dw, dwc);
- dwc_chan_resume(dwc);
+ dwc_chan_resume(dwc, true);
/* active_list entries will end up before queued entries */
list_splice_init(&dwc->queue, &list);
diff --git a/drivers/dma/dw/dw.c b/drivers/dma/dw/dw.c
index 977aa28bf81d..156088f768f2 100644
--- a/drivers/dma/dw/dw.c
+++ b/drivers/dma/dw/dw.c
@@ -35,6 +35,13 @@ static void dw_dma_suspend_chan(struct dw_dma_chan *dwc, bool drain)
channel_writel(dwc, CFG_LO, cfglo | DWC_CFGL_CH_SUSP);
}
+static void dw_dma_resume_chan(struct dw_dma_chan *dwc, bool drain)
+{
+ u32 cfglo = channel_readl(dwc, CFG_LO);
+
+ channel_writel(dwc, CFG_LO, cfglo & ~DWC_CFGL_CH_SUSP);
+}
+
static u32 dw_dma_bytes2block(struct dw_dma_chan *dwc,
size_t bytes, unsigned int width, size_t *len)
{
@@ -91,6 +98,7 @@ int dw_dma_probe(struct dw_dma_chip *chip)
/* Channel operations */
dw->initialize_chan = dw_dma_initialize_chan;
dw->suspend_chan = dw_dma_suspend_chan;
+ dw->resume_chan = dw_dma_resume_chan;
dw->encode_maxburst = dw_dma_encode_maxburst;
dw->bytes2block = dw_dma_bytes2block;
dw->block2bytes = dw_dma_block2bytes;
diff --git a/drivers/dma/dw/idma32.c b/drivers/dma/dw/idma32.c
index 8707830f39ad..cd23b9238333 100644
--- a/drivers/dma/dw/idma32.c
+++ b/drivers/dma/dw/idma32.c
@@ -34,12 +34,20 @@ static void idma32_suspend_chan(struct dw_dma_chan *dwc, bool drain)
if (drain)
cfglo |= IDMA32C_CFGL_CH_DRAIN;
- else
- cfglo &= ~IDMA32C_CFGL_CH_DRAIN;
channel_writel(dwc, CFG_LO, cfglo | DWC_CFGL_CH_SUSP);
}
+static void idma32_resume_chan(struct dw_dma_chan *dwc, bool drain)
+{
+ u32 cfglo = channel_readl(dwc, CFG_LO);
+
+ if (drain)
+ cfglo &= ~IDMA32C_CFGL_CH_DRAIN;
+
+ channel_writel(dwc, CFG_LO, cfglo & ~DWC_CFGL_CH_SUSP);
+}
+
static u32 idma32_bytes2block(struct dw_dma_chan *dwc,
size_t bytes, unsigned int width, size_t *len)
{
@@ -117,6 +125,7 @@ int idma32_dma_probe(struct dw_dma_chip *chip)
/* Channel operations */
dw->initialize_chan = idma32_initialize_chan;
dw->suspend_chan = idma32_suspend_chan;
+ dw->resume_chan = idma32_resume_chan;
dw->encode_maxburst = idma32_encode_maxburst;
dw->bytes2block = idma32_bytes2block;
dw->block2bytes = idma32_block2bytes;
diff --git a/drivers/dma/dw/regs.h b/drivers/dma/dw/regs.h
index 66aa8b227248..6cf299facf45 100644
--- a/drivers/dma/dw/regs.h
+++ b/drivers/dma/dw/regs.h
@@ -315,6 +315,7 @@ struct dw_dma {
/* Channel operations */
void (*initialize_chan)(struct dw_dma_chan *dwc);
void (*suspend_chan)(struct dw_dma_chan *dwc, bool drain);
+ void (*resume_chan)(struct dw_dma_chan *dwc, bool drain);
void (*encode_maxburst)(struct dw_dma_chan *dwc, u32 *maxburst);
u32 (*bytes2block)(struct dw_dma_chan *dwc, size_t bytes,
unsigned int width, size_t *len);